Rio Grande City is a city located in Starr County Texas. It is also the county seat of Starr County. With a 2020 population of 14,647, it is the 191st largest city in Texas and the 2352nd largest city in the United States . Rio Grande City is currently growing at a rate of 0.47% annually and its population has increased by 5.88% since the most recent census, which recorded a population of 13,834 in 2010. Rio Grande City reached it's highest population of 14,647 in 2021. Spanning over 11 miles, Rio Grande City has a population density of 1,290 people per square mile.
The average household income in Rio Grande City is $51,926 with a poverty rate of 34.10%. The median rental costs in recent years comes to $643 per month, and the median house value is $72,100. The median age in Rio Grande City is 32.1 years, 30.9 years for males, and 34.8 years for females.