| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rio Grande City | 1 | 15,495 | 15,290 | 0.28% | 1,365 | 11 | City |
| Roma | 2 | 11,556 | 11,511 | 0.11% | 1,970 | 6 | City |
| Escobares | 3 | 2,586 | 2,585 | 0.04% | 967 | 3 | City |
| La Grulla | 4 | 1,234 | 1,236 | 0% | 1,317 | 1 | City |
Rio Grande City is the largest city in Starr County, with a population of 15,495.
La Grulla is the smallest city in Starr County, with a population of 1,234.
There are 4 cities in Starr County, Texas.