17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rock Springs | 1 | 22,595 | 23,492 | -0.79% | 1,144 | 19.75 | City |
| Green River | 2 | 11,289 | 11,806 | -0.9% | 818 | 13.81 | City |
| North Rock Springs | 3 | 2,610 | 2,727 | 1.04% | 177 | 14.76 | CDP |
| Purple Sage | 4 | 549 | 764 | 0.18% | 1,669 | 0.33 | CDP |
| James Town | 5 | 501 | 632 | -0.4% | 156 | 3.20 | CDP |
| Clearview Acres | 6 | 420 | 994 | -5.62% | 350 | 1.20 | CDP |
| Eden | 7 | 225 | 132 | -1.32% | 17 | 13.51 | CDP |
| Farson | 8 | 193 | 211 | -3.98% | 8 | 23.95 | CDP |
| Wamsutter | 9 | 193 | 202 | -1.03% | 119 | 1.63 | Town |
| Superior | 10 | 178 | 187 | -1.11% | 159 | 1.12 | Town |
| McKinnon | 11 | 95 | 65 | 6.74% | 16 | 5.85 | CDP |
| Granger | 12 | 91 | 96 | -1.09% | 35 | 2.59 | Town |
| Arrowhead Springs | 13 | 90 | 121 | 7.14% | 78 | 1.15 | CDP |
| Point Rocks | 14 | 85 | 58 | 7.6% | 39 | 2.18 | CDP |
| Bairoil | 15 | 64 | 68 | -1.54% | 45 | 1.41 | Town |
| Washam | 16 | 59 | 67 | 7.27% | 19 | 3.11 | CDP |
| Little America | 17 | 26 | 29 | 8.33% | 10 | 2.71 | CDP |
Rock Springs is the largest city in Sweetwater County, with a population of 22,595.
Little America is the smallest city in Sweetwater County.
There are 17 cities in Sweetwater County, Wyoming.