Seminole, TX has a population of 7,239 and is the 5,058th largest city in the United States. The population density is 1,976 per sq mi which is 1938% higher than the Texas average and 2081% higher than the national average. The median age in Seminole is 33 which is approximately 4% lower than the Texas average of 34. In Seminole, 65% of the population over 15 years of age are married, 56% speak English and 34% speak Spanish. 72% of Seminole residents were born in Texas, 12% were born out of state, 1% were born outside of the United States and 15% were foreign born.