Rio Grande City
- County:
- Starr County
- County Seat:
- Yes
- Area (mi²):
- 11.351
- State:
- Texas
Rio Grande City is a city located in Starr County, Texas. Rio Grande City has a 2026 population of 15,526. It is also the county seat of Starr County. Rio Grande City is currently growing at a rate of 0.52% annually and its population has increased by 1.21% since the most recent census, which recorded a population of 15,341 in 2020.