9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stanford | 1 | 419 | 396 | 1.21% | 977 | 0.43 | Town |
| Hobson | 2 | 188 | 177 | 1.07% | 879 | 0.21 | City |
| Geyser | 3 | 93 | 78 | 8.14% | 104 | 0.89 | CDP |
| Raynesford | 4 | 64 | 42 | 6.67% | 640 | 0.10 | CDP |
| Moccasin | 5 | 36 | 45 | 5.88% | 114 | 0.32 | CDP |
| Windham | 6 | 27 | 44 | 3.85% | 65 | 0.42 | CDP |
| Sapphire Ridge | 7 | 25 | 21 | 8.7% | 46 | 0.54 | CDP |
| Utica | 8 | 24 | 10 | 9.09% | 96 | 0.25 | CDP |
| Surprise Creek Colony | 9 | 13 | 14 | 8.33% | 85 | 0.15 | CDP |
Stanford is the largest city in Judith Basin County, with a population of 419.
Surprise Creek Colony is the smallest city in Judith Basin County.
There are 9 cities in Judith Basin County, Montana.