List of counties in Wyoming
|Counties of Wyoming|
|Location||State of Wyoming|
|Populations||2,467 (Niobrara) – 100,512 (Laramie)|
|Areas||2,004 square miles (5,190 km2) (Hot Springs) – 10,426 square miles (27,000 km2) (Sweetwater)|
This is a list of counties in Wyoming. There are 23 counties in the U.S. state of Wyoming. There were originally five counties in the Wyoming Territory: Laramie and Carter, established in 1867; Carbon and Albany established in 1868; and Uinta, an annexed portion of Utah and Idaho, extending from Montana (including Yellowstone Park) to the Wyoming-Utah boundary. On July 10, 1890, Wyoming was admitted to the Union with thirteen counties in it. Ten more counties were created after statehood.
Three counties were renamed after their creation. Carter County was renamed Sweetwater County on December 1, 1869. Hanover County existed for seven days in 1911 before it was renamed Washakie County. Pease County, formed in 1875, was renamed Johnson County in 1879.
The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify states and counties, is provided with each entry. Wyoming's code is 56, which when combined with any county code would be written as 56XXX. The FIPS code for each county links to census data for that county.
|Albany County||001||Laramie||1868||One of the original five counties.||City of Albany, New York, from which early settlers hailed.||37,066||4,274 sq mi
|Big Horn County||003||Basin||1896||Parts of Sheridan County, Johnson County, and Fremont County.||Big Horn Mountains, a mountain range extending into northern Wyoming||11,521||3,137 sq mi
|Campbell County||005||Gillette||1911||Parts of Weston County and Crook County.||John Allen Campbell (1835–80), first governor of the Wyoming Territory (1869–75)||47,026||4,797 sq mi
|Carbon County||007||Rawlins||1868||One of the original five counties.||The vast coal beds in the county.||14,537||7,897 sq mi
|Converse County||009||Douglas||1888||Parts of Albany County and Laramie County.||A.R. Converse, a banker and rancher from Cheyenne, Wyoming.||13,751||4,255 sq mi
|Crook County||011||Sundance||1875||Parts of Laramie County and Albany County.||General George Crook (1828–90), who served in the American Civil War and the Indian Wars.||7,181||2,859 sq mi
|Fremont County||013||Lander||1884||Part of Sweetwater County.||John C. Frémont (1813–90), explorer, U.S. Senator for California, and the first presidential candidate of a major party to run on a platform in opposition to slavery||39,234||9,183 sq mi
|Goshen County||015||Torrington||1911||Part of Laramie County.||The Land of Goshen, a Biblical paradise.||12,498||2,225 sq mi
|Hot Springs County||017||Thermopolis||1911||Parts of Fremont County, Big Horn County, and Park County.||The hot springs at Thermopolis within the county borders.||4,621||2,004 sq mi
|Johnson County||019||Buffalo||1875||Parts of Carbon County and Sweetwater County.||E.P. Johnson, a lawyer from Cheyenne, Wyoming.||8,447||4,166 sq mi
|Laramie County||021||Cheyenne||1867||One of the original five counties.||Jacques La Ramee (1785?–1821), a French-Canadian fur trapper.||100,512||2,686 sq mi
|Lincoln County||023||Kemmerer||1911||Part of Uinta County.||Abraham Lincoln (1809–65), U.S. President (1861–65)||19,581||4,069 sq mi
|Natrona County||025||Casper||1888||Part of Carbon County.||The natron, or soda deposits found within the county's borders. Natrona means natron in Spanish.||79,955||5,340 sq mi
|Niobrara County||027||Lusk||1911||Part of Converse County.||The Niobrara River, which flows through the state. Niobrara is Omaha for flat or broad river.||2,467||2,626 sq mi
|Park County||029||Cody||1909||Part of Big Horn County.||Yellowstone National Park||29,624||6,943 sq mi
|Platte County||031||Wheatland||1911||Part of Laramie County.||North Platte River. Plate is French for flat.||8,605||2,085 sq mi
|Sheridan County||033||Sheridan||1888||Part of Johnson County.||Philip Sheridan (1831–88), American Civil War general.||30,921||2,523 sq mi
|Sublette County||035||Pinedale||1921||Parts of Fremont County and Lincoln County.||William Sublette, pioneer and fur trapper.||8,728||4,882 sq mi
|Sweetwater County||037||Green River||1867||One of the original five counties.||Sweetwater River (a tributary of the North Platte River), which flows through the state.||42,272||10,426 sq mi
|Teton County||039||Jackson||1921||Part of Lincoln County.||Teton Range, a small mountain range of the Rocky Mountains at the Wyoming-Idaho state line||23,331||4,008 sq mi
|Uinta County||041||Evanston||1869||One of the original five counties.||The Uinta Mountains, named in turn after the Uintah Native American people.||20,450||2,082 sq mi
|Washakie County||043||Worland||1911||Part of Big Horn County||Washakie (1804–1900), a leader of Shoshone Native American tribe.||7,685||2,240 sq mi
|Weston County||045||Newcastle||1890||Part of Crook County||John Weston (1831–95), who was responsible for bringing the first railroad to the area.||6,838||2,398 sq mi
- "General Facts About Wyoming". State of Wyoming. Archived from the original on 2007-05-12. Retrieved 2007-07-20.
- "CARTER COUNTY RECORDS". Wyoming State Archives. Archived from the original on 2008-05-03. Retrieved 2007-07-20.
- "Wyoming Counties". American Local History Network. RootsWeb.com. Retrieved 2007-07-20.
- "FIPS Publish 6-4". National Institute of Standards and Technology. Archived from the original on 2013-09-29. Retrieved 2007-07-20.
- "EPA County FIPS Code Listing". US Environmental Protection Agency. Archived from the original on 2013-07-30. Retrieved 2007-07-20.
- "NACo - Find a county". National Association of Counties. Archived from the original on 2007-09-30. Retrieved 2007-07-20.
- "Name Derivations of Wyoming Counties". Wyoming State Library. Archived from the original on 2013-08-25. Retrieved 2007-07-20.
- "U.S. Census Bureau QuickFacts: Wyoming". United States Census Bureau, Population Division. August 2021. Retrieved September 1, 2021.