| ZIP Codes: | 12 ZIP Codes (3 Standard, 9 PO Box, 0 Unique) [See All] |
| Area Code: | 307 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:14:25 PM |
| Population: | 41,542 [See All] |
| FIPS: | 56037 |
| CBSA: | Rock Springs, WY |
| Land Area: | 4,490 sq mi |
| Water Area: | 34 sq mi |
| Coordinates: | 41.6829, -109.1514 |
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41,542 residents live across 12 ZIPs covering 4,490 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 44,595 to 41,542 from 2014 to 2024 — a -6.8% change. 4 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 82938 (Mc Kinnon, $105,323 median) and poorest ZIP 82336 (Wamsutter, $57,298) are 84.9 miles apart — a 1.8× income gap across local geography.
Median home values vary 4.4× across this county — from $98,700 in 82336 (Wamsutter) to $437,100 in 82938 (Mc Kinnon).
Density varies 94× across the county — from 0 people/sq mi in 82336 (Wamsutter) to 32 in 82935 (Green River).
Educational attainment ranges from 3.8% bachelor's+ in 82336 (Wamsutter) to 35.3% in 82938 (Mc Kinnon) — the breadth of educational profiles across the area.
Within Wyoming, this is the #4 most populous of 28 counties and ranks #16 for median household income .
Weighted by population, the typical household earns about $75,707 across the county — reflecting what a typical resident sees, not a simple ZIP average.
20.9% of adults age 25+ hold a bachelor's degree or higher (5,747 of 27,494 reporting).
3 Standard delivery, 9 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Sweetwater County lost 6.8% of residents between 2014 and 2024.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 82901 | Rock Springs | Standard | 27,198 | $69,954 | 2,003.4 | -6.3% |
| 82935 | Green River | Standard | 12,012 | $87,993 | 378.1 | -8.6% |
| 82932 | Farson | Standard | 997 | $87,632 | 549.0 | 15.3% |
| 82934 | Granger | PO Box | 285 | $83,375 | 133.6 | -25.8% |
| 82336 | Wamsutter | PO Box | 269 | $57,298 | 795.3 | -27.5% |
| 82938 | Mc Kinnon | PO Box | 221 | $105,323 | 281.7 | 39.0% |
| 82945 | Superior | PO Box | 196 | $68,036 | 103.9 | -21.0% |
| 82943 | Reliance | PO Box | 187 | — | 86.3 | 28.1% |
| 82322 | Bairoil | PO Box | 149 | $40,250 | 40.5 | 4.9% |
| 82929 | Little America | PO Box | 19 | — | 118.1 | -44.1% |
| 82942 | Point Of Rocks | PO Box | 9 | — | 0.0 | -89.2% |
| 82902 | Rock Springs | PO Box | — | — | 0.0 | — |