9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stanford | 1 | 422 | 400 | 0.96% | 984 | 0 | Town |
| Hobson | 2 | 187 | 177 | 1.08% | 874 | 0 | City |
| Geyser | 3 | 93 | 78 | 8.14% | 104 | 1 | CDP |
| Raynesford | 4 | 64 | 42 | 6.67% | 640 | 0 | CDP |
| Moccasin | 5 | 36 | 45 | 5.88% | 114 | 0 | CDP |
| Windham | 6 | 27 | 44 | 3.85% | 65 | 0 | CDP |
| Sapphire Ridge | 7 | 25 | 21 | 8.7% | 46 | 1 | CDP |
| Utica | 8 | 24 | 10 | 9.09% | 96 | 0 | CDP |
| Surprise Creek Colony | 9 | 13 | 14 | 8.33% | 85 | 0 | CDP |
Stanford is the largest city in Judith Basin County, with a population of 422.
Surprise Creek Colony is the smallest city in Judith Basin County, with a population of 13.
There are 9 cities in Judith Basin County, Montana.