9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Steamboat Springs | 1 | 13,719 | 13,218 | 0.73% | 1,387 | 10 | City |
| Steamboat Springs | 2 | 13,719 | 13,222 | 0.73% | 1,387 | 10 | City |
| Hayden | 3 | 1,917 | 1,931 | -0.16% | 588 | 3 | Town |
| Hayden | 4 | 1,917 | 1,931 | -0.16% | 588 | 3 | Town |
| Oak Creek | 5 | 847 | 889 | -1.05% | 2,295 | 0 | Town |
| Oak Creek | 6 | 847 | 890 | -1.05% | 2,295 | 0 | Town |
| Phippsburg | 7 | 431 | 207 | 7.21% | 363 | 1 | CDP |
| Yampa | 8 | 387 | 398 | -0.77% | 1,573 | 0 | Town |
| Yampa | 9 | 387 | 399 | -0.77% | 1,573 | 0 | Town |
Steamboat Springs is the largest city in Routt County, with a population of 13,719.
Yampa is the smallest city in Routt County, with a population of 387.
There are 9 cities in Routt County, Colorado.