7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Delta | 1 | 9,844 | 9,064 | 1.61% | 742 | 13 | City |
| Orchard City | 2 | 3,308 | 3,148 | 0.98% | 287 | 12 | Town |
| Cedaredge | 3 | 2,468 | 2,287 | 1.48% | 1,259 | 2 | Town |
| Paonia | 4 | 1,467 | 1,452 | 0.2% | 1,770 | 1 | Town |
| Hotchkiss | 5 | 956 | 883 | 1.49% | 1,032 | 1 | Town |
| Crawford | 6 | 409 | 396 | 0.49% | 1,629 | 0 | Town |
| Lazear | 7 | 178 | 245 | 7.23% | 111 | 2 | CDP |
Delta is the largest city in Delta County, with a population of 9,844.
Lazear is the smallest city in Delta County, with a population of 178.
There are 7 cities in Delta County, Colorado.