How many people live in Sweetwater County, WY?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 41,300 people living in Sweetwater County, WY. That makes Sweetwater County the fourth-most populous county in Wyoming. It is home to 7% of people living in the state.
41.3K
population of Sweetwater County, WY (2024)
7%
County share of the Wyoming population (2024)
About 41,300 people lived in Sweetwater County, WY in 2024.
Population estimates, 2000–2024
What are Sweetwater County, WY’s age demographics?
About 6,700 Sweetwater County, WY residents are aged 65 and older in 2024. That represents 16.3% of its population. For comparison, the age group represents 19.8% of Wyoming’s population and 18% in the US overall.
Another 9,900 Sweetwater County residents, or 23.9% of the population, were children under 18. For comparison, the age group represents 21.9% of Wyoming’s population and 21.6% in the US overall.
A higher share of Sweetwater County, WY's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Sweetwater County, WY’s racial and ethnic demographics?
Non-Hispanic white residents make up 78% of the Sweetwater County, WY population, higher than the national share of 57.5%. Sweetwater County, WY also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (0.81%) than the US overall (0.72%).
In contrast, Sweetwater County’s non-Hispanic Black or African American population accounts for 1%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 0.79% of the county, compared with 6.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Sweetwater County, WY has a higher share of a Hispanic population than Wyoming as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Sweetwater County, WY is Rock Springs with about 23,000 residents in 2024.
Cities and towns in Sweetwater County, WY ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Rock Springs | 22,967 |
| 2. | Green River | 11,474 |
| 3. | Wamsutter | 197 |
| 4. | Superior | 183 |
| 5. | Granger | 97 |
| 6. | Bairoil | 66 |
| 7. | Balance of Sweetwater County | 6,289 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
