6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Madras | 1 | 7,912 | 7,492 | 1.07% | 969 | 8.16 | City |
| Warm Springs | 2 | 2,330 | 2,702 | -1.73% | 55 | 42.44 | CDP |
| Culver | 3 | 1,712 | 1,607 | 1.24% | 2,463 | 0.69 | City |
| Terrebonne | 4 | 1,308 | 1,623 | 0.23% | 1,289 | 1.01 | CDP |
| Metolius | 5 | 1,049 | 981 | 1.35% | 2,195 | 0.48 | City |
| Camp Sherman | 6 | 333 | 327 | 2.15% | 106 | 3.15 | CDP |
Madras is the largest city in Jefferson County, with a population of 7,912.
Camp Sherman is the smallest city in Jefferson County.
There are 6 cities in Jefferson County, Oregon.