| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Monte Vista | 1 | 3,948 | 4,255 | -1.42% | 1,497 | 3 | City |
| Center | 2 | 1,879 | 1,959 | -0.58% | 1,915 | 1 | Town |
| Del Norte | 3 | 1,384 | 1,456 | -0.86% | 1,285 | 1 | Town |
| South Fork | 4 | 504 | 517 | -0.4% | 198 | 3 | Town |
Monte Vista is the largest city in Rio Grande County, with a population of 3,948.
South Fork is the smallest city in Rio Grande County, with a population of 504.
There are 4 cities in Rio Grande County, Colorado.