Jefferson County

All are named after Thomas Jefferson, except Oregon (Mount Jefferson) and Wisconsin (named after the county in New York).

Jefferson County

1. one of 67 counties in Alabama, USA, with its county seat in Birmingham.
2. one of 75 counties in Arkansas, USA, county seat Pine Bluff.
3. one of 64 counties in Colorado, USA, county seat Golden.
4. one of 67 counties in Florida, USA, county seat Monticello.
5. one of 159 counties in Georgia, USA, county seat Louisville.
6. one of 44 counties in Idaho, USA, county seat Rigby.
7. one of 102 counties in Illinois, USA, county seat Mount Vernon.
8. one of 92 counties in Indiana, USA, county seat Madison.
9. one of 99 counties in Iowa, USA, county seat Fairfield.
10. one of 105 counties in Kansas, USA, county seat Oskaloosa.
11. one of 120 counties in Kentucky, USA, county seat Louisville.
12. one of 82 counties in Mississippi, USA, county seat Fayette.
13. one of 114 counties in Missouri, USA, county seat Hillsboro.
14. one of 56 counties in Montana, USA, county seat Boulder.
15. one of 93 counties in Nebraska, USA, county seat Fairbury.
16. one of 62 counties in New York, USA, county seat Watertown.
17. one of 88 counties in Ohio, USA, county seat Steubenville.
18. one of 77 counties in Oklahoma, USA, county seat Waurika.
19. one of 36 counties in Oregon, USA, county seat Madras.
20. one of 67 counties in Pennsylvania, USA, county seat Brookville.
21. one of 95 counties in Tennessee, USA, county seat Dandridge.
22. one of 254 counties in Texas, USA, county seat Beaumont.
23. one of 39 counties in Washington, USA, county seat Port Townsend.
24. one of 55 counties in West Virginia, USA, county seat Charles Town.
25. one of 72 counties in Wisconsin, USA, county seat Jefferson.

• Jefferson Parish (Louisiana)

• Index of U.S. counties#J on Wikipedia.Wikipedia