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Sweetwater County, Wyoming facts for kids

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Sweetwater County
City Hall (Rock Springs, Wyoming), 2007
City Hall (Rock Springs, Wyoming), 2007
Flag of Sweetwater County
Map of Wyoming highlighting Sweetwater County
Location within the U.S. state of Wyoming
Map of the United States highlighting Wyoming
Wyoming's location within the U.S.
Country  United States
State  Wyoming
Founded December 17, 1867
Named for Sweetwater River
Seat Green River
Largest city Rock Springs
 • Total 10,491 sq mi (27,170 km2)
 • Land 10,427 sq mi (27,010 km2)
 • Water 64 sq mi (170 km2)  0.6%%
 • Total 42,272
 • Density 4.02936/sq mi (1.55574/km2)
Time zone UTC−7 (Mountain)
 • Summer (DST) UTC−6 (MDT)
Area code 307
Congressional district At-large

Sweetwater County is a county in southwestern Wyoming, United States. As of the 2020 United States Census, the population was 42,272, making it the fourth-most populous county in Wyoming. Its county seat is Green River. By area, it is the largest county in Wyoming. Its southern boundary line abuts the north lines of the states of Colorado and Utah.

Sweetwater County comprises the Rock Springs, Green River, Wyoming Micropolitan Statistical Area.


Sweetwater County was originally created on December 17, 1867 as a county within the Dakota Territory. The county was derived from land that was previously part of Laramie County. The county was originally named Carter County for Judge W.A. Carter of Fort Bridger In 1869, the newly established legislature of the Wyoming Territory renamed the county for the Sweetwater River.

Also in 1869, Uinta County was organized with land ceded by Sweetwater County. Johnson County, originally named Pease County, was formed from parts of Sweetwater County and Carbon County in 1875. In 1884, Sweetwater County lost territory when Fremont County was created. Sweetwater County also lost territory when Carbon County was formed in 1886. At that point, the county achieved its present boundaries except for minor adjustments in 1909, 1911, and 1951.

South Pass City was the county seat from 1867 until 1873. At that time, the county seat was moved to Green River.


According to the U.S. Census Bureau, the county has a total area of 10,491 square miles (27,170 km2), of which 10,427 square miles (27,010 km2) is land and 64 square miles (170 km2) (0.6%) is water. The largest county in Wyoming, Sweetwater County is larger than six states and is the eighth-largest county in the United States (not including boroughs and census areas in Alaska). Most of the Great Divide Basin lies within the county, comprising the county's northeast quadrant.

Adjacent counties

National protected areas


Historical population
Census Pop.
1870 1,916
1880 2,561 33.7%
1890 4,941 92.9%
1900 8,455 71.1%
1910 11,575 36.9%
1920 13,640 17.8%
1930 18,165 33.2%
1940 19,407 6.8%
1950 22,017 13.4%
1960 17,920 −18.6%
1970 18,391 2.6%
1980 41,723 126.9%
1990 38,823 −7.0%
2000 37,613 −3.1%
2010 43,806 16.5%
2020 42,272 −3.5%
US Decennial Census
1870–2000 2010–2020

2010 census

As of the 2010 United States Census, there were 43,806 people, 16,475 ;households, and 11,405 families in the county. The population density was 4.2 inhabitants per square mile (1.6/km2). There were 18,735 housing units at an average density of 1.8 per square mile (0.69/km2). The racial makeup of the county was 88.5% white, 1.0% American Indian, 1.0% black or African American, 0.8% Asian, 0.1% Pacific islander, 6.4% from other races, and 2.3% from two or more races. Those of Hispanic or Latino origin made up 15.3% of the population. In terms of ancestry, 22.4% were German, 19.0% were English, 13.0% were Irish, 7.4% were Italian, and 4.4% were American.

Of the 16,475 households, 36.7% had children under the age of 18 living with them, 53.5% were married couples living together, 9.0% had a female householder with no husband present, 30.8% were non-families, and 24.0% of all households were made up of individuals. The average household size was 2.62 and the average family size was 3.09. The median age was 32.8 years.

The median income for a household in the county was $69,828 and the median income for a family was $79,527. Males had a median income of $65,174 versus $31,738 for females. The per capita income for the county was $30,961. About 6.1% of families and 8.2% of the population were below the poverty line, including 12.0% of those under age 18 and 5.0% of those age 65 or over.




Census-designated places

Other unincorporated communities

Ghost towns

See also

Kids robot.svg In Spanish: Condado de Sweetwater para niños

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