Ennis, TX has a population of 18,890 and is the 2,311th largest city in the United States. The population density is 669 per sq mi which is 590% higher than the Texas average and 638% higher than the national average. The median age in Ennis is 32 which is approximately 7% lower than the Texas average of 34. In Ennis, 59% of the population over 15 years of age are married, 67% speak English and 32% speak Spanish. 72% of Ennis residents were born in Texas, 11% were born out of state, 1% were born outside of the United States and 16% were foreign born.