Allegheny County, Pennsylvania

Allegheny County (/ælɪˈɡeɪni/) is a county in the southwest of the U.S. state of Pennsylvania. As of 2019 the population was 1,216,045, making it the state's second-most populous county, following Philadelphia County. The county seat is Pittsburgh.[2] Allegheny County is included in the Pittsburgh, PA Metropolitan Statistical Area, and in the Pittsburgh Designated Market Area.

Not to be confused with Allegheny, Pennsylvania.

Allegheny County
U.S. county
Flag
Seal
Location within the U.S. state of Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°28′N 79°59′W
Country United States
State Pennsylvania
FoundedSeptember 24, 1788
Named forAllegheny River
SeatPittsburgh
Largest cityPittsburgh
Area
 • Total745 sq mi (1,930 km2)
 • Land730 sq mi (1,900 km2)
 • Water14 sq mi (40 km2)  1.9%%
Population
 • Estimate 
(2019)
1,216,045
 • Density1,666/sq mi (643/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional districts17th, 18th
Websitewww.alleghenycounty.us
DesignatedDecember 30, 1982[1]

Allegheny was Pennsylvania's first county to bear a Native American name, being named after the Allegheny River. The word "Allegheny" is of Lenape origin, with uncertain meaning. It is usually said to mean "fine river", but sometimes said to refer to an ancient mythical tribe called "Allegewi" that lived along the river before being destroyed by the Lenape.[3]

History

Little is known of the region's inhabitants prior to European contact. During the colonial era, various native groups claimed or settled in the area, resulting in a multi-ethnic mix that included Iroquois, Lenape, Shawnee, and Mingo. European fur traders such as Peter Chartier established trading posts in the region in the early eighteenth century.

1680 British map of western Pennsylvania and Allegheny County from the Darlington Collection

In 1749, Captain Pierre Joseph Céloron de Blainville claimed the Ohio Valley and all of western Pennsylvania for Louis XV of France. The captain traveled along the Ohio and Allegheny rivers inserting lead plates in the ground to mark the land for France.

Since most of the towns during that era were developed along waterways, both the French and the British desired control over the local rivers. Therefore, the British sent Major George Washington to expel the French from their posts, with no success. Failing in this objective, he nearly drowned in the ice-filled Allegheny River while returning. The English tried in 1754 to again enter the area. They sent 41 Virginians to build Fort Prince George. The French learned of the plan and sent an army to capture the fort, which they then resumed building with increased fortification, renaming it Fort Duquesne.

The loss cost the English dearly because Fort Duquesne became a focal point of the French and Indian War. The first attempt to retake the fort, the Braddock Expedition, failed miserably.[4] It was recaptured in 1758 by British forces under General John Forbes; he had it destroyed after its capture. The British then built a new, larger fort on the site, including a moat, and named it Fort Pitt. The site is now Pittsburgh's Point State Park.

Both Pennsylvania and Virginia claimed the region that is now Allegheny County. Pennsylvania administered most of the region as part of its Westmoreland County. Virginia considered everything south of the Ohio River and east of the Allegheny River to be part of its Yohogania County and governed it from Fort Dunmore. In addition, parts of the county were located in the proposed British colony of Vandalia and the proposed U.S. state of Westsylvania. The overlapping boundaries, multiple governments, and confused deed claims soon proved unworkable. In 1780 Pennsylvania and Virginia agreed to extend the Mason–Dixon line westward, and the region became part of Pennsylvania. From 1781 until 1788, much of what had been claimed as part of Yohogania County, Virginia, was administered as a part of the newly created Washington County, Pennsylvania.

Allegheny County was officially created on September 24, 1788, from parts of Washington and Westmoreland counties. It was formed due to pressure from settlers living in the area around Pittsburgh, which became the county seat in 1791. The county originally extended north to the shores of Lake Erie; it was reduced to its current borders by 1800.

The Allegheny County Courthouse

In the 1790s, a whiskey excise tax was imposed by the United States federal government. This started the so-called Whiskey Rebellion when the farmers who depended on whiskey income refused to pay and drove off tax collector John Neville. After a series of demonstrations by farmers, President George Washington sent troops to stop the rebellion.

The area developed rapidly in the 1800s to become the nation's prime steel producer; Pittsburgh gained the label "Steel Capital of the World".

In 1913 the County's 125th anniversary was celebrated with a week long chain of events, the final day September 27 was marked with a steamboat parade consisting of 30 paddle wheelers which sailed from Monongahela Wharf down the Ohio to the Davis Island Dam. The boats in line were the Steel City (formerly the Pittsburgh and Cincinnati packet Virginia), the flag ship; City of Parkersburg, Charles Brown, Alice Brown, Exporter, Sam Brown, Boaz, Raymond Horner, Swan, Sunshine, I. C. Woodward, Cruiser, Volunteer, A. R. Budd, J. C. Risher, Clyde, Rival, Voyager, Jim Brown, Rover, Charlie Clarke, Robt. J. Jenkins, Slipper, Bertha, Midland Sam Barnum, Cadet, Twilight, and Troubadour.[5]

Geography

According to the U.S. Census Bureau, the county has a total area of 745 square miles (1,930 km2), of which 730 square miles (1,900 km2) is land and 14 square miles (36 km2) (1.9%) is water.[6]

Three majors traverse Allegheny County: the Allegheny River and the Monongahela River converge at Downtown Pittsburgh to form the Ohio River. The Youghiogheny River flows into the Monongahela River at McKeesport, 10 miles (16 km) southeast. There are several islands in these courses. The rivers drain into the Gulf of Mexico via the Mississippi River. Although the county's industrial growth caused the clearcutting of the area's forests, a significant woodland remains.

Adjacent counties

Major roads and highways

Climate

Allegheny has a humid continental climate which is hot-summer (Dfa) except in higher areas where it is warm-summer (Dfb).

Law and government

Until January 1, 2000, Allegheny County's government was defined under Pennsylvania's Second Class County Code. The county government was charged with all local activities, including elections, prisons, airports, public health, and city planning. All public offices were headed by elected citizens. There were three elected county commissioners.

On January 1, 2000, the Home-Rule Charter went into effect. It replaced the three elected commissioners with an elected chief officer (the County Executive), a county council with 15 members (13 elected by district, two elected county-wide), and an appointed county manager. The changes were intended to maintain a separation of powers between the executive and legislative branches while providing greater citizen control.

County Medical Examiner office

The county has 130 self-governing municipalities, the most in the state.[12] (Luzerne is second with 76).[13] The county has one Second Class City (Pittsburgh) and three Third Class Cities (Clairton, Duquesne, and McKeesport).

A 2004 study found the county would be better served by consolidating the southeastern portion of the county (which includes many small communities with modest economies) into a large municipality ("Rivers City") with a combined population of approximately 250,000.[14]

State relations

Under the Onorato administration, Allegheny County paid $10,000 per month to Robert Ewanco, of Greenlee Partners, to lobby the Pennsylvania General Assembly.[15][16] County officials credit him with a "20-fold" return in the form of appropriations for a widening project on Pennsylvania Route 28, as well as a footbridge and security cameras at Duquesne University.[16]

County Executive

County Council
  • Bethany Hallam, At-large, Democrat
  • Tom Baker, District 1, Republican
  • Cindy Kirk, District 2, Republican
  • Anita Prizio, District 3, Democrat
  • Patrick Catena, President, District 4, Democrat
  • Tom Duerr, District 5, Democrat
  • John F. Palmiere, District 6, Democrat
  • Nicholas Futules, District 7, Democrat
  • Paul Zavarella, District 8, Democrat
  • Robert J. Macey, Vice President, District 9, Democrat
  • DeWitt Walton, District 10, Democrat
  • Paul Klein, District 11, Democrat
  • Robert Palmosina, District 12, Democrat
  • Olivia Bennett, District 13, Democrat
  • Samuel DeMarco, III, At-large, Republican

Other elected county offices
  • Controller, Chelsa Wagner, Democrat
  • District Attorney, Stephen A. Zappala Jr., Democrat
  • Sheriff, William P. Mullen, Democrat
  • Treasurer, John K. Weinstein, Democrat

Politics
Presidential election results
Presidential election results[17]
Year Republican Democratic Third parties
2016 39.5% 259,480 55.9% 367,617 4.6% 30,092
2012 42.0% 262,039 56.5% 352,687 1.5% 9,101
2008 41.6% 272,347 57.1% 373,153 1.3% 8,539
2004 42.1% 271,925 57.2% 368,912 0.7% 4,632
2000 40.4% 235,361 56.7% 329,963 3.0% 17,154
1996 37.9% 204,067 52.8% 284,480 9.3% 50,068
1992 29.8% 183,035 52.8% 324,004 17.5% 107,148
1988 39.4% 231,137 59.5% 348,814 1.1% 6,200
1984 42.8% 284,692 56.0% 372,576 1.3% 8,480
1980 43.8% 271,850 47.9% 297,464 8.4% 52,104
1976 46.8% 303,127 50.7% 328,343 2.5% 16,387
1972 55.6% 371,737 42.3% 282,496 2.1% 14,302
1968 37.1% 264,790 51.1% 364,906 11.8% 84,121
1964 33.6% 241,707 66.0% 475,207 0.4% 2,811
1960 42.8% 320,970 57.1% 428,455 0.2% 1,293
1956 54.8% 384,939 45.0% 315,989 0.2% 1,102
1952 49.0% 359,224 50.6% 370,945 0.4% 2,903
1948 42.6% 253,272 54.9% 326,303 2.5% 14,931
1944 42.5% 261,218 57.1% 350,690 0.4% 2,393
1940 41.5% 263,285 58.0% 367,926 0.5% 2,987
1936 31.4% 176,224 65.2% 366,593 3.5% 19,377
1932 42.4% 152,326 52.9% 189,839 4.7% 16,838
1928 56.9% 215,626 42.4% 160,733 0.8% 2,850
1924 59.0% 149,296 8.7% 21,984 32.3% 81,733
1920 69.2% 138,908 20.1% 40,278 10.7% 21,530
1916 55.2% 77,483 37.7% 52,833 7.1% 9,948
1912 18.9% 23,822 24.9% 31,417 56.3% 71,147
1908 60.8% 74,080 29.3% 35,655 10.0% 12,170
1904 76.5% 90,594 18.2% 21,541 5.3% 6,270
1900 69.9% 71,780 26.6% 27,311 3.4% 3,533
1896 70.9% 76,691 27.6% 29,809 1.6% 1,674
1892 58.3% 45,788 39.3% 30,867 2.4% 1,849
1888 63.6% 45,118 34.8% 24,710 1.6% 1,138

Voter registration

As of November 7, 2017, there were 921,861 registered voters in the county; a majority were Democrats. There were 536,248 registered Democrats, 258,340 registered Republicans, 120,994 voters registered to other parties, 4,929 to the Libertarian Party and 1,350 voters registered to the Green Party.[18]

Chart of Voter Registration

  Democratic (58.17%)
  Republican (28.02%)
  NPA/Other Parties (13.12%)
  Libertarian (0.53%)
  Green (0.15%)
Voter registration and party enrollment
Party Number of voters Percentage
Democratic 536,248 58.17
Republican 258,340 28.02
Others 120,994 13.12
Libertarian 4,929 0.53
Green 1,350 0.15
Total 921,861 100%

As of April 27, 2020, there were 895,158 registered voters in the county; a majority were Democrats. There were 521,327 registered Democrats, 249,831 registered Republicans, 79,490 voters registered as No Affiliation Voters and 44,510 registered to other parties. [19]

Chart of Voter Registration

  Democratic (58.24%)
  Republican (27.91%)
  NPA (8.88%)
  Other Parties (4.97%)
Voter registration and party enrollment
Party Number of voters Percentage
Democratic 521,327 58.24
Republican 249,831 27.91
Others 79,490 8.88
Other Parties 44,510 4.97
Total 895,158 100.0

The Republican Party had been historically dominant in county-level politics in the 19th and early 20th centuries; prior to the Great Depression, Pittsburgh and Allegheny County had been majority Republican. Since the Great Depression on the state and national levels, the Democratic Party has been dominant in county-level politics and is the Democratic stronghold of western Pennsylvania. In 2000, Democrat Al Gore won 56% of the vote and Republican George W. Bush won 41%. In 2004, Democrat John Kerry received 57% of the vote and Republican Bush received 42%. In 2006, Democrats Governor Ed Rendell and Senator Bob Casey, Jr. won 59% and 65% of the vote in Allegheny County, respectively. In 2008, Democrat Barack Obama received 57% of the vote, John McCain received 41%, and each of the three state row office winners (Rob McCord for Treasurer, Jack Wagner for Auditor General, and Tom Corbett for Attorney General) also carried Allegheny. In 2016, despite Donald Trump being the first Republican to carry Pennsylvania since 1988, Hillary Clinton did slightly better than Barack Obama's 2012 vote total while Donald Trump was the worst performing Republican in 20 years. In the 2018 Midterms, Democrats received an even higher percentage of the vote with Tom Wolf and Bob Casey receiving approximately two thirds of the county's vote[20][21]. This is an improvement over the approximately 55% each person received in the county in their last election in 2014 and 2012 respectively.

State representatives

State senators

U.S. representatives
  • Conor Lamb, Democrat, 17th district
  • Michael F. Doyle, Democrat, 18th district

Religion

In 2010 statistics, the largest religious group in Allegheny County was the Diocese of Pittsburgh, with 460,672 Catholics worshipping at 179 parishes, followed by 44,204 UMC Methodists with 100 congregations, 42,838 PC-USA Presbyterians with 145 congregations, 33,103 non-denominational adherents with 85 congregations, 24,718 ELCA Lutherans with 77 congregations, 17,148 ABCUSA Baptists with 42 congregations, 12,398 AoG Pentecostals with 30 congregations, 8,483 Reform Jews with 6 congregations, 7,780 TEC Episcopalians with 19 congregations, and 6,700 Hindus with two temples. Altogether, 60.6% of the population was claimed as members by religious congregations, although members of historically African-American denominations were underrepresented due to incomplete information.[22] In 2014, Allegheny County had 794 religious organizations, the 11th most out of all US counties.[23]

Demographics
Historical population
CensusPop.%±
179010,203—
180015,08747.9%
181025,31767.8%
182034,92137.9%
183050,55244.8%
184081,23560.7%
1850138,29070.2%
1860178,83129.3%
1870262,20446.6%
1880355,86935.7%
1890551,95955.1%
1900775,05840.4%
19101,018,46331.4%
19201,185,80816.4%
19301,374,41015.9%
19401,411,5392.7%
19501,515,2377.3%
19601,628,5877.5%
19701,605,016−1.4%
19801,450,085−9.7%
19901,336,449−7.8%
20001,281,666−4.1%
20101,223,348−4.6%
Est. 20191,216,045[24]−0.6%
U.S. Decennial Census[25]
1790–1960[26] 1900–1990[27]
1990–2000[28] 2010–2018[29]

As of the 2010 census, there were 1,223,348 people living in the county. The population density was 1676 people per square mile (647/km²). The racial makeup of the county was 82.87% White, 14.39% Black or African American, 2.94% Asian, 0.03% Pacific Islander, 0.37% from other races, and 1.40% from two or more races. About 1.31% of the population were Hispanic or Latino of any race.

At the census[30] of 2000, there were 1,281,666 people, 537,150 households, and 332,495 families living in the county. The population density was 1,755 people per square mile (678/km²). There were 583,646 housing units at an average density of 799 per square mile (309/km²). The racial makeup of the county was 84.33% White, 12.41% Black or African American, 0.12% Native American, 1.69% Asian, 0.03% Pacific Islander, 0.34% from other races, and 1.07% from two or more races. About 0.87% of the population were Hispanic or Latino of any race. 20.0% were of German, 15.0% Italian, 12.7% Irish, 7.5% Polish and 5.1% English ancestry according to Census 2000. 93.5% spoke English and 1.3% Spanish as their first language.

There were 537,150 households out of which 26.40% had children under the age of 18 living with them, 46.10% were married couples living together, 12.40% had a female householder with no husband present, and 38.10% were non-families. Some 32.70% of all households were made up of individuals and 13.20% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.96.

The age distribution of the population shows 21.90% under the age of 18, 8.50% from 18 to 24, 28.30% from 25 to 44, 23.40% from 45 to 64, and 17.80% who were 65 years of age or older. The median age was 40. For every 100 females, there were 90.00 males; for every 100 females age 18 and over, there were 86.20 males.

Economy
See also: Economy of Pittsburgh

In the late 18th century farming played a critical role in the growth of the area. There was a surplus of grain due to transportation difficulties in linking with the eastern portion of the state. As a result, the farmers distilled the grain into whiskey, which significantly helped the farmers financially.

Employment by occupation in Allegheny County

The area quickly became a key manufacturing area in the young nation. Coupled with deposits of iron and coal, and the easy access to waterways for barge traffic, the city quickly became one of the most important steel producing areas in the world. Based on 2007 data from the US Army Corps of Engineers, Pittsburgh is the second (after Laredo, Texas) busiest inland port in the nation.

US steel production declined late in the 20th century, and Allegheny County's economy began a shift to other industries. It is presently known for its hospitals, universities, and industrial centers. Despite the decline of heavy industry, Pittsburgh is home to a number of major companies and is ranked in the top ten among US cities hosting headquarters of Fortune 500 corporations, including U.S. Steel Corporation, PNC Financial Services Group, PPG Industries, and H. J. Heinz Company.

The county leads the state in number of defense contractors supplying the U.S. military.[31]

Regions

Education

Colleges and universities

Community, junior and technical colleges

Public school districts
Map of Allegheny County, Pennsylvania Public School Districts

Approved private schools

The Commonwealth of Pennsylvania has 36 Approved Private Schools including the Charter Schools for the Blind and Deaf. The private schools are licensed by the State Board of Private Academic Schools. They provide a free appropriate special education for students with severe disabilities. The cost of tuition for these schools is paid 60% by the state and 40% by the local school district where the student is a resident. Pennsylvania currently has four PA chartered and 30 non-charter APSs for which the Department approves funding. These schools provide a program of special education for over 4,000 day and residential students. Parents are not charged for the services at the school.[32] In 2009, the Pennsylvania Department of Education budgeted $98 million for the tuition of children in approved private schools and $36.8 million for students attending the charter schools for the deaf and blind.[33] The majority of these schools are located in the southeastern region and southwestern region of Pennsylvania.

  • ACLD Tillotson School, Pittsburgh – Tuition rate $38,804
  • The Day School at The Children's Institute, Pittsburgh – Tuition rate $55,217
  • DePaul School for Hearing and Speech, Pittsburgh – Tuition rate $36,892
  • Easter Seal Society of Western Pennsylvania – Tuition rate $60,891.97
  • The Education Center at the Watson Institute, Sewickley – Tuition rate $42,242
  • Pace School, Pittsburgh – Tuition rate – $37,635
  • Pressley Ridge Day School, Pittsburgh – Tuition rate – $51,177
  • Pressley Ridge School for the Deaf, Pittsburgh – Tuition rate – $66,022, residential $128,376
  • The Watson Institute Friendship Academy, Pittsburgh – Tuition rate – $38,211
  • Wesley Spectrum Highland Services, Pittsburgh – Tuition rate – $39,031
  • Western Pennsylvania School for Blind Children, Pittsburgh – Tuition rate – $82,500, residential $120,100
  • Western Pennsylvania School for the Deaf, Pittsburgh – Tuition rate – $61,051, residential – $99,919

Private high schools

21st Century Community Learning Centers

These are state-designated before- and after-school program providers. They receive state funding through grants. CCLCs provide academic, artistic and cultural enhancement activities to students and their families when school is not in session.[34]

  • Boys & Girls Clubs of Western PA – 2010 Grant – $261,748
  • Cornell School District – 2010 Grant – $526,800
  • Human Services Center Corporation – 2010 Grant- $550,000
  • McKeesport Area School District – 2010 Grant – $468,000
  • Penn Hills School District – 2010 Grant – $360,000
  • The Hill House/One Small Step −2010 Grant – $675,000
  • Wireless Neighborhoods – 2010 Grant – $612,000

Transportation

Allegheny County's public transportation provider is the Port Authority of Allegheny County. The Allegheny County Department of Public Works oversees infrastructure, maintenance, and engineering services in the county.

The Three Rivers Heritage Trail provides uninterrupted bicycle and pedestrian connections along the three rivers in the city, and the Great Allegheny Passage trail runs from downtown Pittsburgh to Washington, D.C.

The Allegheny County Airport is the original airport for Pittsburgh and houses a number of flight schools, charter flight operations, and medevac operations.

Major roadways

For information about major state roads, see list of State Routes in Allegheny County, Pennsylvania and Allegheny County Belt System.

Parks and recreation

There are two Pennsylvania state parks in Allegheny County. Point State Park is at the confluence of the Allegheny and Monongahela rivers in Downtown Pittsburgh, and Allegheny Islands State Park is in the Allegheny River in Harmar Township and is undeveloped as of August 2010.

Pennsylvania State Game Lands Number 203 is also located in Allegheny County providing hunting and other activities.

Sports

Communities
Map of Allegheny County, Pennsylvania, with municipal labels showing cities and boroughs (red), Townships (white), and census-designated places (blue)

Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and (in one case) a town. The following municipalities are in Allegheny County:

Cities

Boroughs

Townships

Census-designated places

Census-designated places are geographical areas designated by the US Census Bureau for the purposes of compiling demographic data. They are not actual jurisdictions under Pennsylvania law. Other unincorporated communities, such as villages, may be listed here as well.

Unincorporated communities

Former places

Many political subdivisions of Allegheny County have come and gone through subdivision or annexation through the years. These include:

  • Allegheny City – the area that is now the North Shore (or North Side) of the City of Pittsburgh, north of the Allegheny River.
  • Allentown Borough – now the neighborhood of Allentown in Pittsburgh.
  • Birmingham Borough – what is now Pittsburgh's South Side.
  • Brushton Borough
  • Carrick Borough – now the neighborhood of Carrick. Formed out of Baldwin Township in 1904, this borough existed until it was annexed by Pittsburgh in 1927. It was named for Carrick-on-Suir, Ireland. Some of the area's manhole covers still bear the Carrick Borough name.
  • Chartier Township – existed at the time of the 1860 U.S. Federal Census.[38]
  • Collins Township – in what is now the northeast part of the City of Pittsburgh, east of Lawrenceville and north of Penn Avenue.
  • Knoxville Borough
  • Lawrenceville Borough
  • McClure Township – McClure was formed in 1858 from the section of Ross Township adjacent to Allegheny City. In 1867 McClure, along with sections of Reserve Township, was incorporated into Allegheny City. The McClure section of this annexation became Wards 9 (Woods Run Area) and 11 (present-day Brighton Heights) in the City of Pittsburgh.
  • Mifflin Township- comprised the modern day communities of Whitaker, West Mifflin, West Homestead, West Elizabeth, Pleasant Hills, Munhall, Lincoln Place, Jefferson Hills, Homestead, Hays, Duquesne, Dravosburg, Clairton and part of Baldwin.[39]
  • Patton Township – was in the east-central part of the county, north of North Versailles Township, east of Wilkins and Penn Townships, and south of Plum Township. In the U.S. census for 1860–1880. In 1951 it became incorporated as the borough of Monroeville.
  • Northern Liberties Borough – in what is now the Strip District of Pittsburgh. The borough was annexed to Pittsburgh in 1837 as the first addition to the city's original territory.
  • Peebles Township – included most of what is now the eastern part of the city of Pittsburgh from the Monongahela River in the south (today's Hazelwood) to the Allegheny River in the north. It was subdivided into Collins and Liberty townships, all of which were incorporated into Pittsburgh in 1868.
  • Pitt Township
  • St. Clair Township – stretched from the Monongahela River south to the Washington County line. It divided into Lower St. Clair, which eventually became part of the City of Pittsburgh, Dormont, Mount Lebanon, and Upper St. Clair.
  • Snowden – now known as South Park Township.
  • Sterrett Township
  • Temperanceville – what is now Pittsburgh's West End.
  • Union Borough – the area surrounding Temperanceville.
  • West Liberty Borough – now the neighborhoods of Brookline and Beechview in Pittsburgh.

Population ranking

The population ranking of the following table is based on the 2010 census of Allegheny County.[40]

† county seat

Rank City/Town/etc. Population (2010 Census) Municipal type Incorporated
1 † Pittsburgh 305,704 City 1794 (borough) 1816 (city)
2 Penn Hills 42,329 Municipality 1851 (Penn Twp.) 1958 (Penn Hills Twp.) 1976 (municipality)
3 Mt. Lebanon 33,137 Municipality 1912 (township) 1975 (municipality)
4 Bethel Park 32,313 Municipality 1949 (borough) 1978 (municipality)
5 Ross 31,105 Municipality 1809
6 Monroeville 28,386 Municipality 1951
7 Plum 27,126 Borough 1788 (township) 1956 (borough)
8 Allison Park 21,552 CDP
9 West Mifflin 20,313 Borough 1942
10 Baldwin 19,767 Borough 1950
11 McKeesport 19,731 City 1842 (borough) 1891 (city)
12 Wilkinsburg 15,930 Borough 1871 (Sterrett Twp.) 1887 (borough)
13 Whitehall 13,944 Borough 1948
14 Franklin Park 13,470 Borough
15 Munhall 11,406 Borough
16 Carnot-Moon 11,372 CDP
17 Jefferson Hills 10,619 Borough
18 Brentwood 9,643 Borough 1916
19 Swissvale 8,983 Borough
20 Glenshaw 8,981 CDP
21 Dormont 8,593 Borough 1909
22 Bellevue 8,370 Borough 1867
23 Castle Shannon 8,316 Borough 1919
24 Pleasant Hills 8,268 Borough
25 Carnegie 7,972 Borough 1894
26 White Oak 7,862 Borough
27 Clairton 6,796 City 1903 (borough) 1922 (city)
28 West View 6,771 Borough
29 Forest Hills 6,518 Borough 1919
30 Oakmont 6,303 Borough 1889
31 McKees Rocks 6,104 Borough 1892
32 Crafton 5,951 Borough
33 Coraopolis 5,677 Borough 1886
34 Duquesne 5,565 City 1891 (borough) 1918 (city)
35 Fox Chapel 5,388 Borough
36 Turtle Creek 5,349 Borough
37 Bridgeville 5,148 Borough 1901
38 North Braddock 4,857 Borough
39 Avalon 4,705 Borough 1874
40 Tarentum 4,530 Borough 1842
41 Glassport 4,483 Borough
42 Green Tree 4,432 Borough 1885
43 Sewickley 3,827 Borough
44 Port Vue 3,798 Borough
45 Millvale 3,744 Borough
46 Pitcairn 3,689 Borough
47 Etna 3,451 Borough
48 Sharpsburg 3,446 Borough
49 Springdale 3,405 Borough
50 Mount Oliver 3,403 Borough
51 Ingram 3,330 Borough
52 Brackenridge 3,260 Borough 1901
53 Trafford (mostly in Westmoreland County) 3,174 Borough 1904
54 Homestead 3,165 Borough
55 Edgewood 3,118 Borough 1888
56 Churchill 3,011 Borough
57 Aspinwall 2,801 Borough 1892
58 Gibsonia 2,733 CDP
59 Liberty 2,551 Borough
60 Imperial 2,541 CDP
61 Verona 2,474 Borough 1871
62 Emsworth 2,449 Borough
63 Greenock 2,195 CDP
64 Wilmerding 2,190 Borough
65 Braddock 2,159 Borough 1867
66 McDonald (mostly in Washington County) 2,149 Borough 1889
67 East McKeesport 2,126 Borough
68 Rankin 2,122 Borough
69 West Homestead 1,929 Borough
70 Braddock Hills 1,880 Borough 1946
71 East Pittsburgh 1,822 Borough
72 Dravosburg 1,792 Borough
73 Ben Avon 1,781 Borough 1891
74 Bakerstown 1,761 CDP
75 Cheswick 1,746 Borough
76 Sturgeon 1,710 CDP
77 Edgeworth 1,680 Borough
78 Versailles 1,515 Borough
79 Elizabeth 1,493 Borough
80 Oakdale 1,459 Borough
81 Russellton 1,440 CDP
82 Blawnox 1,432 Borough 1925
83 Bell Acres 1,388 Borough 1960
84 Whitaker 1,271 Borough
85 Heidelberg 1,244 Borough
86 Leetsdale 1,218 Borough
87 Bradford Woods 1,171 Borough 1915
88 Rennerdale 1,150 CDP
89 Lincoln 1,072 Borough
90 Curtisville 1,064 CDP
91 Enlow 1,013 CDP
92 Harwick 899 CDP
93 Sewickley Heights 810 Borough
94 Chalfant 800 Borough
95 Bairdford 698 CDP
96 Pennsbury Village 661 Borough
97 Sewickley Hills 639 Borough
98 Wall 580 Borough
99 Noblestown 575 CDP
100 Glen Osborne 547 Borough
101 Boston 545 CDP
102 West Elizabeth 518 Borough
103 Thornburg 455 Borough
104 Clinton 434 CDP
105 Rosslyn Farms 427 Borough
106 Ben Avon Heights 371 Borough 1913
107 Glenfield 205 Borough
108 Haysville 70 Borough

See also

Notes
  1. Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1981 to 2010.
  2. Records kept January 1871 to June 1935 at the Weather Bureau Office across the Allegheny River from downtown, at Allegheny County Airport from July 1935 to 14 September 1952, and at Pittsburgh Int'l (KPIT) since 15 September 1952. Due to its river valley and urban location as well as elevation, many of the summertime warm minima temperature records set at the WBO have not even come close to being matched at KPIT, which is at-elevation and located in the western suburbs. For more information, see Threadex

References
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