Hartley, TX has a population of 530 and is the 19,195th largest city in the United States. The population density is 76 per sq mi which is 22% lower than the Texas average and 16% lower than the national average. The median age in Hartley is 35 which is approximately 1% higher than the Texas average of 34. In Hartley, 75% of the population over 15 years of age are married, 51% speak English and 48% speak Spanish. 46% of Hartley residents were born in Texas, 21% were born out of state, 3% were born outside of the United States and 30% were foreign born.