Tomball, TX has a population of 11,353 and is the 3,571st largest city in the United States. The population density is 923 per sq mi which is 853% higher than the Texas average and 919% higher than the national average. The median age in Tomball is 37 which is approximately 9% higher than the Texas average of 34. In Tomball, 57% of the population over 15 years of age are married, 81% speak English and 17% speak Spanish. 61% of Tomball residents were born in Texas, 29% were born out of state, 1% were born outside of the United States and 9% were foreign born.