Sweetwater County, Wyoming

Sweetwater County: County in Wyoming, United States


Sweetwater County is a county located in the U.S. state of Wyoming. As of the 2010 census, the population was 43,806 and a population density of 2 people per km². After 10 years in 2020 county had an estimated population of 42,673 inhabitants. Its county seat is Green River. The county was created 157 years ago in 1866.

Sweetwater County locator map
Location of Sweetwater County on Wyoming map.

Quick Facts about Sweetwater County

Population : 42,673 (2020)
Country : United States of America
State : Wyoming (United States)
Area : 27172 km2
Official name : Sweetwater County
Water as percent of area : 0.6%
Land as percent of area : 99.4%
Named for : Sweetwater River
Altitude : 6,470 feet / 1972 meters
Capital : Green River
Establishment : January 01, 1867
Time Zone : America/Denver
Local time : 20:11:40 (22nd February 2024)
Density : 2 Pop. per km² as of 2020
Population growth : -2.66% (2010-2020)
DowntownRS image
DowntownRS image


Sweetwater County is located at 41°39'34"N 108°52'46"W (41.6595000, -108.8794200). It has 8 neighbors: Summit County, Carbon County, Moffat County, Daggett County, Fremont County, Lincoln County, Sublette County and Uinta County.

Sweetwater County map

The largest city of Sweetwater County is Rock Springs with a population of 22,943. Other cities include and Green River population 11,788. See all Sweetwater County cities & populated places.

Sweetwater County Populated Places

Cities, towns, neighborhoods & other populated places in Sweetwater County.

City Name Population Title
Rock Springs 22,943 City in Sweetwater County, Wyoming, United States
Green River 11,788 River in Wyoming, Utah, and Colorado, in the United States, that is a tributary of the Colorado River
North Rock Springs 2,207 Census-designated place in Sweetwater County, Wyoming
Wamsutter 467 Town of the United States
Superior 312 Town of the United States
Granger 128 Town in Wyoming
Bairoil 97 Town of the United States

Sweetwater County has 8 neighbours.

  • Green River


According to census records, the population of Sweetwater County decreased by 2.66% in 10 years.

Year Population % Change Method
2000 37,613 - census
2010 43,806 14.14% census
2011 43,986 0.41% estimation process
2012 45,002 2.26% estimation process
2013 45,157 0.34% estimation process
2014 44,948 -0.46% estimation process
2015 44,719 -0.51% estimation process
2016 44,222 -1.12% estimation process
2017 43,464 -1.74% estimation process
2018 42,858 -1.41% estimation process
2019 42,343 -1.22% estimation process
2020 42,673 0.77% estimation process

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Wyoming Other Counties (more counties)

County Name Population Title
Laramie County 100,595 County in the southeastern corner of Wyoming, United States
Natrona County 80,815 County in Wyoming, United States
Cheyenne 64,742 The most populous city in Laramie County, Wyoming.
Casper 58,498 The most populous city in Natrona County, Wyoming.
Campbell County 46,676 County in northeastern Wyoming, United States
Fremont County 39,317 County in western Wyoming, United States
Albany County 38,950 County in Wyoming, United States
Laramie 32,661 City in and county seat of Albany County, Wyoming, United States
Gillette 32,220 City in Campbell County, Wyoming, United States
Sheridan County 30,863 County in Wyoming, United States
Park County 29,331 County in Colorado, United States
Teton County 23,497 County in Wyoming, United States
Rock Springs 22,943 City in Sweetwater County, Wyoming, United States
Lincoln County 20,253 County in Wyoming, United States
Uinta County 20,215 County in Wyoming, United States
Sheridan 18,095 City in Wyoming, United States