Three counties were renamed after their creation. Carter County was renamed Sweetwater County on December 1, 1869.[2] Hanover County existed for seven days in 1911 before it was renamed Washakie County.[3] Pease County, formed in 1875, was renamed Johnson County in 1879.[3]
County
|
FIPS Code
[5] |
County Seat
[6] |
Created
[1] |
Formed from
[1] |
Etymology
[7] |
Population
[6][8] |
Area
[6][8] |
Map
|
| Albany County |
001 |
Laramie |
1868 |
One of the original five counties. |
City of Albany, New York. |
&0000000000032014.00000032,014 |
&0000000000004274.0000004,274 sq mi
(&0000000000011070.00000011,070 kmē) |
 |
| 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 |
&0000000000011461.00000011,461 |
&0000000000003137.0000003,137 sq mi
(&0000000000008125.0000008,125 kmē) |
 |
| 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) |
&0000000000033698.00000033,698 |
&0000000000004797.0000004,797 sq mi
(&0000000000012424.00000012,424 kmē) |
 |
| Carbon County |
007 |
Rawlins |
1868 |
One of the original five counties. |
The vast coal beds in the county. |
&0000000000015639.00000015,639 |
&0000000000007897.0000007,897 sq mi
(&0000000000020453.00000020,453 kmē) |
 |
| Converse County |
009 |
Douglas |
1888 |
Parts of Albany County and Laramie County. |
A.R. Converse, a banker and rancher from Cheyenne, Wyoming. |
&0000000000012052.00000012,052 |
&0000000000004255.0000004,255 sq mi
(&0000000000011020.00000011,020 kmē) |
 |
| Crook County |
011 |
Sundance |
1875 |
Parts of Laramie County and Albany County. |
General George Crook (1820-1829), who served in the American Civil War and the Indian Wars. |
&0000000000005887.0000005,887 |
&0000000000002859.0000002,859 sq mi
(&0000000000007405.0000007,405 kmē) |
 |
| 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 |
&0000000000035804.00000035,804 |
&0000000000009183.0000009,183 sq mi
(&0000000000023784.00000023,784 kmē) |
 |
| Goshen County |
015 |
Torrington |
1911 |
Part of Laramie County. |
The Land of Goshen, a Biblical paradise. |
&0000000000012538.00000012,538 |
&0000000000002225.0000002,225 sq mi
(&0000000000005763.0000005,763 kmē) |
 |
| 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. |
&0000000000004882.0000004,882 |
&0000000000002004.0000002,004 sq mi
(&0000000000005190.0000005,190 kmē) |
 |
| Johnson County |
019 |
Buffalo |
1875 |
Parts of Carbon County and Sweetwater County. |
E.P. Johnson, a lawyer from Cheyenne, Wyoming. |
&0000000000007075.0000007,075 |
&0000000000004166.0000004,166 sq mi
(&0000000000010790.00000010,790 kmē) |
 |
| Laramie County |
021 |
Cheyenne |
1867 |
One of the original five counties. |
Jacques La Ramie (1785--1821), a French-Canadian fur trapper. |
&0000000000081607.00000081,607 |
&0000000000002686.0000002,686 sq mi
(&0000000000006957.0000006,957 kmē) |
 |
| Lincoln County |
023 |
Kemmerer |
1911 |
Part of Uinta County. |
Abraham Lincoln (1805-1965), U.S. President (1861-1865) |
&0000000000014573.00000014,573 |
&0000000000004069.0000004,069 sq mi
(&0000000000010539.00000010,539 kmē) |
 |
| 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. |
&0000000000066533.00000066,533 |
&0000000000005340.0000005,340 sq mi
(&0000000000013831.00000013,831 kmē) |
 |
| 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. |
&0000000000002407.0000002,407 |
&0000000000002626.0000002,626 sq mi
(&0000000000006801.0000006,801 kmē) |
 |
| Park County |
029 |
Cody |
1909 |
Part of Big Horn County. |
Yellowstone National Park, which incorparates most of the county. |
&0000000000025786.00000025,786 |
&0000000000006943.0000006,943 sq mi
(&0000000000017982.00000017,982 kmē) |
 |
| Platte County |
031 |
Wheatland |
1911 |
Part of Laramie County. |
North Platte River. Platte is French for flat. |
&0000000000008807.0000008,807 |
&0000000000002085.0000002,085 sq mi
(&0000000000005400.0000005,400 kmē) |
 |
| Sheridan County |
033 |
Sheridan |
1888 |
Part of Johnson County. |
Philip Sheridan, American Civil War general. |
&0000000000026560.00000026,560 |
&0000000000002523.0000002,523 sq mi
(&0000000000006535.0000006,535 kmē) |
 |
| Sublette County |
035 |
Pinedale |
1921 |
Parts of Fremont County and Lincoln County. |
William Sublette, pioneer. |
&0000000000005920.0000005,920 |
&0000000000004882.0000004,882 sq mi
(&0000000000012644.00000012,644 kmē) |
 |
| 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. |
&0000000000037613.00000037,613 |
&0000000000010426.00000010,426 sq mi
(&0000000000027003.00000027,003 kmē) |
 |
| Teton County |
039 |
Jackson |
1921 |
Part of Lincoln County. |
Teton Range, a small mountain range of the Rocky Mountains Wyoming-Idaho border |
&0000000000018251.00000018,251 |
&0000000000004008.0000004,008 sq mi
(&0000000000010381.00000010,381 kmē) |
 |
| Uinta County |
041 |
Evanston |
1869 |
One of the original five counties. |
The Uintah Mountains, named in turn after the Uintah Native American people. |
&0000000000019742.00000019,742 |
&0000000000002082.0000002,082 sq mi
(&0000000000005392.0000005,392 kmē) |
 |
| Washakie County |
043 |
Worland |
1911 |
Part of Big Horn County |
Washakie (1804-1900), a leader of Shoshone Native American tribe. |
&0000000000008289.0000008,289 |
&0000000000002240.0000002,240 sq mi
(&0000000000005802.0000005,802 kmē) |
 |
| Weston County |
045 |
Newcastle |
1890 |
Part of Crook County |
John B. Weston, railroad promoter. |
&0000000000006644.0000006,644 |
&0000000000002398.0000002,398 sq mi
(&0000000000006211.0000006,211 kmē) |
 |