List of counties in Wyoming

Wikimedia list article

There are 23 counties in the U.S. state of Wyoming. First there were five counties in the Wyoming Territory. They were Laramie and Carter, formed in 1867; Carbon and Albany formed in 1868; and Uinta, an added portion of Utah and Idaho, extending from Montana (including Yellowstone Park) to the Wyoming-Utah boundary.[1] On July 10, 1890, Wyoming was admitted to the Union with thirteen counties.[1]

The Federal Information Processing Standard (FIPS) code, used by the United States government to uniquely identify states and counties, is provided with each entry.[2] Wyoming's code is 56. When combined with any county code it would be written as 56XXX. The FIPS code for each county links to census data for that county.[3]


County Seat
Formed from
Meaning of name
Albany County 001 Laramie 1868 One of the original five counties. City of Albany, New York, from which early settlers hailed. 32,014 4,274 sq mi
(11,070 km2)
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 11,461 3,137 sq mi
(8,125 km2)
Campbell County 005 Gillette 1911 Parts of Weston County and Crook County. John Allen Campbell (1835-1880), first governor of the Wyoming Territory (1869-1875) 33,698 4,797 sq mi
(12,424 km2)
Carbon County 007 Rawlins 1868 One of the original five counties. The vast coal beds in the county. 15,639 7,897 sq mi
(20,453 km2)
Converse County 009 Douglas 1888 Parts of Albany County and Laramie County. A.R. Converse, a banker and rancher from Cheyenne, Wyoming. 12,052 4,255 sq mi
(11,020 km2)
Crook County 011 Sundance 1875 Parts of Laramie County and Albany County. General George Crook (1828-1890), who served in the American Civil War and the Indian Wars. 5,887 2,859 sq mi
(7,405 km2)
Fremont County 013 Lander 1884 Part of Sweetwater County. John C. Frémont (1813-1890), explorer, U.S. Senator for California, and the first presidential candidate of a major party to run on a platform in opposition to slavery 35,804 9,183 sq mi
(23,784 km2)
Goshen County 015 Torrington 1911 Part of Laramie County. The Land of Goshen, a Biblical paradise. 12,538 2,225 sq mi
(5,763 km2)
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. 4,882 2,004 sq mi
(5,190 km2)
Johnson County 019 Buffalo 1875 Parts of Carbon County and Sweetwater County. E.P. Johnson, a lawyer from Cheyenne, Wyoming. 7,075 4,166 sq mi
(10,790 km2)
Laramie County 021 Cheyenne 1867 One of the original five counties. Jacques La Ramee (1785?–1821), a French-Canadian fur trapper. 81,607 2,686 sq mi
(6,957 km2)
Lincoln County 023 Kemmerer 1911 Part of Uinta County. Abraham Lincoln (1809-1865), U.S. President (1861-1865) 14,573 4,069 sq mi
(10,539 km2)
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. 66,533 5,340 sq mi
(13,831 km2)
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. 2,407 2,626 sq mi
(6,801 km2)
Park County 029 Cody 1909 Part of Big Horn County. Yellowstone National Park, which includes most of the county. 25,786 6,943 sq mi
(17,982 km2)
Platte County 031 Wheatland 1911 Part of Laramie County. North Platte River. Plate is French for flat. 8,807 2,085 sq mi
(5,400 km2)
Sheridan County 033 Sheridan 1888 Part of Johnson County. Philip Sheridan (1831 - 1888), American Civil War general. 26,560 2,523 sq mi
(6,535 km2)
Sublette County 035 Pinedale 1921 Parts of Fremont County and Lincoln County. William Sublette, pioneer and fur trapper. 5,920 4,882 sq mi
(12,644 km2)
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. 37,613 10,426 sq mi
(27,003 km2)
Teton County 039 Jackson 1921 Part of Lincoln County. Teton Range, a small mountain range of the Rocky Mountains Wyoming-Idaho border 18,251 4,008 sq mi
(10,381 km2)
Uinta County 041 Evanston 1869 One of the original five counties. The Uintah Mountains, named in turn after the Uintah Native American people. 19,742 2,082 sq mi
(5,392 km2)
Washakie County 043 Worland 1911 Part of Big Horn County Washakie (1804-1900), a leader of Shoshone Native American tribe. 8,289 2,240 sq mi
(5,802 km2)
Weston County 045 Newcastle 1890 Part of Crook County John Weston (1831 - 1895), who was responsible for bringing the first railroad to the area. 6,644 2,398 sq mi
(6,211 km2)


  1. 1.0 1.1 1.2 1.3 "General Facts About Wyoming". State of Wyoming. Archived from the original on 2007-05-12. Retrieved 2007-07-20.
  2. "FIPS Publish 6-4". National Institute of Standards and Technology. Archived from the original on 2013-09-29. Retrieved 2007-07-20.
  3. 3.0 3.1 "EPA County FIPS Code Listing". US Environmental Protection Agency. Retrieved 2007-07-20.
  4. 4.0 4.1 4.2 "NACo - Find a county". National Association of Counties. Archived from the original on 2007-09-30. Retrieved 2007-07-20.
  5. "Name Derivations of Wyoming Counties". Wyoming State Library. Archived from the original on 2013-08-25. Retrieved 2007-07-20.
  6. 6.0 6.1 "Wyoming QuickFacts". U.S. Census Bureau. Archived from the original on 2013-10-21. Retrieved 2007-07-20. (2000 Census)