4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Monte Vista | 1 | 3,974 | 4,252 | -1.39% | 1,506 | 3 | City |
| Center | 2 | 1,878 | 1,930 | -0.58% | 2,174 | 1 | Town |
| Del Norte | 3 | 1,398 | 1,458 | -0.85% | 1,298 | 1 | Town |
| South Fork | 4 | 502 | 512 | -0.4% | 197 | 3 | Town |
Monte Vista is the largest city in Rio Grande County, with a population of 3,974.
South Fork is the smallest city in Rio Grande County, with a population of 502.
There are 4 cities in Rio Grande County, Colorado.