Robstown, TX has a population of 11,622 and is the 3,504th largest city in the United States. The population density is 750 per sq mi which is 673% higher than the Texas average and 727% higher than the national average. The median age in Robstown is 31 which is approximately 8% lower than the Texas average of 34. In Robstown, 54% of the population over 15 years of age are married, 37% speak English and 62% speak Spanish. 92% of Robstown residents were born in Texas, 3% were born out of state, 1% were born outside of the United States and 4% were foreign born.