Crystal City, TX has a population of 7,414 and is the 4,966th largest city in the United States. The population density is 2,034 per sq mi which is 1999% higher than the Texas average and 2145% higher than the national average. The median age in Crystal City is 31 which is approximately 11% lower than the Texas average of 34. In Crystal City, 45% of the population over 15 years of age are married, 19% speak English and 81% speak Spanish. 75% of Crystal City residents were born in Texas, 14% were born out of state, 3% were born outside of the United States and 8% were foreign born.