Crystal City is a city in and the county seat of Zavala County, Texas, United States. The population was 6,354 as of the 2020 census. It was settled as a farming and ranching community and was a major railroad stop being 110 miles (180 km) from San Antonio. Spinach became a major crop and the city has promoted itself as "Spinach Capital of the World." During World War II, a large internment camp was located here. The town is also noteworthy in the history of Mexican American political self-determination for the founding of the La Raza Unida Party.

Zavala County is a county located in the U.S. state of Texas. As of the 2020 census, the population was 11,677. Its county seat is Crystal City. The county was created in 1858 and later organized in 1884. Zavala is named for Lorenzo de Zavala, Mexican politician, signer of the Texas Declaration of Independence, and first vice president of the Republic of Texas.