4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Monte Vista | 1 | 3,919 | 4,252 | -1.38% | 1,486 | 3 | City |
| Center | 2 | 1,868 | 1,930 | -0.53% | 1,904 | 1 | Town |
| Del Norte | 3 | 1,386 | 1,458 | -0.86% | 1,287 | 1 | Town |
| South Fork | 4 | 500 | 512 | -0.4% | 197 | 3 | Town |
Monte Vista is the largest city in Rio Grande County, with a population of 3,919.
South Fork is the smallest city in Rio Grande County, with a population of 500.
There are 4 cities in Rio Grande County, Colorado.