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Time Zone: Sweetwater County lies in the Mountain Time Zone (MST/MDT) and observes daylight saving time.

The community of Green River is the Seat for Sweetwater County.

Sweetwater County is one of the original counties of Wyoming and was founded in 1867.

From the Census Estimates for 2009, <1> Sweetwater had a population of 41,226 people. This is an increase of 9.61% since the last Census (which gave a population of 37,613 people in 2000).

At the time of the 2000 Census, Sweetwater represented 7.62% of the total population of Wyoming, making it the state's 3rd most populous county (out of 23 counties).

The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.

Since 2000
Year-to-Year Change
201043,806+16.47%+6.26% since 2009
200941,226+9.61%+3.21% since 2008
200839,942+6.19%+1.58% since 2007
200037,613The Last Census

More information can be found on the Sweetwater County Census Page for Sweetwater County.


Below are some of the communities located in Sweetwater County (for more communities, please visit our Nearby Page for Sweetwater County):

Community 2009
(2009vs. 2000)
Rock Springs   20,90518,70811.74% increase  
Green River   12,41111,8085.11% increase  
Wamsutter   31026118.77% increase  
Superior   2422440.82% decrease  
Granger   1491462.05% increase  

Websites for Sweetwater County

Official Website:   www.co.sweet.wy.us/

If you know of a history or genealogy society whose interest includes Sweetwater County, would you please send us the URL for their website? We would like to add their link to our Gazetteer. To contact us, please visit our Feedback Page.

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Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

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<2>All Quarter-dollar coin images from the United States Mint.

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