4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rio Grande City | 1 | 15,572 | 15,341 | 0.3% | 1,372 | 11 | City |
| Roma | 2 | 11,659 | 11,537 | 0.21% | 1,988 | 6 | City |
| Escobares | 3 | 2,591 | 2,579 | 0.08% | 969 | 3 | City |
| La Grulla | 4 | 1,237 | 1,237 | 0% | 1,320 | 1 | City |
Rio Grande City is the largest city in Starr County, with a population of 15,572.
La Grulla is the smallest city in Starr County, with a population of 1,237.
There are 4 cities in Starr County, Texas.