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List of Wyoming Counties and County Seats

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The U.S. state of Wyoming has 23 counties. Explore list of Wyoming Counties and County Seats in alphabetical order and check their population, areas and the date of formation.

List of Wyoming Counties and County Seat

CountyCounty SeatPopulation (2011)Area Formed
1Albany CountyLaramie37,2764,274 sq mi1868
2Big Horn CountyBasin11,7943,137 sq mi1896
3Campbell CountyGillette47,8744,797 sq mi1911
4Carbon CountyRawlins15,6667,897 sq mi1868
5Converse CountyDouglas14,0084,255 sq mi1888
6Crook CountySundance7,1552,859 sq mi1875
7Fremont CountyLander41,1109,183 sq mi1884
8Goshen CountyTorrington13,6362,225 sq mi1911
9Hot Springs CountyThermopolis4,8222,004 sq mi1911
10Johnson CountyBuffalo8,6154,166 sq mi1875
11Laramie CountyCheyenne94,4832,686 sq mi1867
12Lincoln CountyKemmerer17,9614,069 sq mi1911
13Natrona CountyCasper78,6215,340 sq mi1888
14Niobrara CountyLusk2,4562,626 sq mi1911
15Park CountyCody28,7026,943 sq mi1909
16Platte CountyWheatland8,7562,085 sq mi1911
17Sheridan CountySheridan29,5962,523 sq mi1888
18Sublette CountyPinedale10,3684,882 sq mi1921
19Sweetwater CountyGreen River45,26710,426 sq mi1867
20Teton CountyJackson21,6754,008 sq mi1921
21Uinta CountyEvanston21,0252,082 sq mi1869
22Washakie CountyWorland8,4642,240 sq mi1911
23Weston CountyNewcastle7,0822,398 sq mi1890