Gustine, TX has a population of 599 and is the 18,441st largest city in the United States. The population density is 654 per sq mi which is 575% higher than the Texas average and 622% higher than the national average. The median age in Gustine is 36 which is approximately 4% higher than the Texas average of 34. In Gustine, 54% of the population over 15 years of age are married, 65% speak English and 34% speak Spanish. 68% of Gustine residents were born in Texas, 16% were born out of state, 1% were born outside of the United States and 16% were foreign born.