Rio Grande City is a city in and the county seat of Starr County, Texas, United States. The population was 14,411 at the time of the 2020 census. The city is 41 miles (66 km) west of McAllen. The city also holds the March record high for the United States at 108 °F (42 °C). The city is connected to Camargo, Tamaulipas, via the Rio Grande City–Camargo International Bridge. The city is situated within the Rio Grande Valley.

McAllen is a city in the U.S. state of Texas and the most populous city in Hidalgo County. It is located at the southern tip of the state in the Rio Grande Valley, on the Mexico–United States border. The city limits extend south to the Rio Grande, across from the Mexican city of Reynosa. McAllen is about 70 mi (110 km) west of the Gulf of Mexico. As of the 2020 census, McAllen's population was 142,210, making it the 23rd-most populous city in Texas. It is the fifth-most populous metropolitan area (McAllen–Edinburg–Mission) in the state of Texas, and the binational Reynosa–McAllen metropolitan area counts a population of more than 1.5 million.