Post Oak Bend City, TX has a population of 665 and is the 17,774th largest city in the United States. The population density is 329 per sq mi which is 239% higher than the Texas average and 263% higher than the national average. The median age in Post Oak Bend City is 46 which is approximately 33% higher than the Texas average of 34. In Post Oak Bend City, 77% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 80% of Post Oak Bend City residents were born in Texas, 19% were born out of state, 0% were born outside of the United States and 1% were foreign born.