Deer Park, TX has a population of 33,517 and is the 1,268th largest city in the United States. The population density is 3,200 per sq mi which is 3201% higher than the Texas average and 3432% higher than the national average. The median age in Deer Park is 35 which is approximately 2% higher than the Texas average of 34. In Deer Park, 59% of the population over 15 years of age are married, 84% speak English and 14% speak Spanish. 71% of Deer Park residents were born in Texas, 20% were born out of state, 2% were born outside of the United States and 7% were foreign born.