Sweetwater County, Wyoming

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Sweetwater County, Wyoming
Map of Wyoming highlighting Sweetwater County
Location in the state of Wyoming
Map of the United States highlighting Wyoming
Wyoming's location in the U.S.
Founded 1867
Named for Sweetwater River
Seat Green River
Largest city Rock Springs
 • Total 10,491 sq mi (27,172 km2)
 • Land 10,427 sq mi (27,006 km2)
 • Water 64 sq mi (166 km2), 0.6%
 • (2010) 43,806
 • Density 4.2/sq mi (2/km²)
Congressional district At-large
Time zone Mountain: UTC-7/-6
Website www.sweet.wy.us

Sweetwater County is a county located in the U.S. state of Wyoming. As of the 2010 census, the population was 43,806.[1] Its county seat is Green River.[2] In area, it is the largest county in the state. It is in the southwestern part of Wyoming, north of the Colorado-Utah state line.

Sweetwater County comprises the Rock Springs, WY Micropolitan Statistical Area.


Sweetwater County was originally created on December 17, 1867 as a county within the Dakota Territory.[3] 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[4] 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.[5] 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[edit]

National protected areas[edit]


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%
Est. 2014 45,010 [6] 2.7%
U.S. Decennial Census[7]
1870–2000[8] 2010–2014[1]

As of the census[9] of 2000, there were 37,613 people, 14,105 households, and 10,099 families residing in the county. The population density was 4 people per square mile (1/km²). There were 15,921 housing units at an average density of 2 per square mile (1/km²). The racial makeup of the county was 91.62% White, 0.73% Black or African American, 1.01% Native American, 0.64% Asian, 0.04% Pacific Islander, 3.59% from other races, and 2.37% from two or more races. 9.42% of the population were Hispanic or Latino of any race. 16.4% are of English, 16.2% German, 9% Irish and 5% Italian ancestry.[10]

There were 14,105 households out of which 38.20% had children under the age of 18 living with them, 57.80% were married couples living together, 9.20% had a female householder with no husband present, and 28.40% were non-families. 23.60% of all households were made up of individuals and 6.90% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.11.

In the county the population was spread out with 28.90% under the age of 18, 10.10% from 18 to 24, 29.30% from 25 to 44, 23.70% from 45 to 64, and 8.00% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 102.40 males. For every 100 females age 18 and over, there were 101.10 males.

The median income for a household in the county was $46,537, and the median income for a family was $54,173. Males had a median income of $45,678 versus $22,440 for females. The per capita income for the county was $19,575. About 5.40% of families and 7.80% of the population were below the poverty line, including 9.20% of those under age 18 and 7.00% of those age 65 or over.


Hyperlocal websites[edit]

Sweetwater County is served by two hyperlocal news websites, SweetwaterNOW.com[11] and Wyo4News.com.[12] SweetwaterNOW.com was founded in February 2013 and Wyo4News.com was founded in September 2013. Both sites provide original reporting, community updates and advertising.


Sweetwater County is served by four print publications: Rock Springs Daily Rocket-Miner, The Mustang Express (formerly The Oracle - Western Wyoming Community College newspaper), The Marquee (a media and entertainment supplement published in the Rocket-Miner), The Green River Star (a weekly newspaper published in Green River) and The Sweetwater County Guide (a weekly shopper's guide published by The Green River Star).




Census-designated places[edit]

Unincorporated communities[edit]

Ghost towns[edit]

See also[edit]


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved January 25, 2014. 
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ Long, John H. (2006). "Wyoming: Individual County Chronologies". Wyoming Atlas of Historical County Boundaries. The Newberry Library. Retrieved 2011-09-01. 
  4. ^ Urbanek, Mae (1988). Wyoming Place Names. Missoula, MT: Mountain Press Publishing Company. ISBN 0-87842-204-8. 
  5. ^ "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved August 18, 2015. 
  6. ^ "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2014". Retrieved June 4, 2015. 
  7. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved August 18, 2015. 
  8. ^ "Historical Decennial Census Population for Wyoming Counties, Cities, and Towns". Wyoming Department of Administration & Information, Division of Economic Analysis. Retrieved January 25, 2014. 
  9. ^ "American FactFinder". United States Census Bureau. Retrieved 2011-05-14. 
  10. ^ http://www.epodunk.com/cgi-bin/genealogyInfo.php?locIndex=22262
  11. ^ http://sweetwaternow.com
  12. ^ http://wyo4news.com

External links[edit]

Coordinates: 41°40′N 108°53′W / 41.66°N 108.89°W / 41.66; -108.89