Abilene, TX has a population of 122,612 and is the 227th largest city in the United States. The population density is 1,149 per sq mi which is 1086% higher than the Texas average and 1168% higher than the national average. The median age in Abilene is 31 which is approximately 9% lower than the Texas average of 34. In Abilene, 51% of the population over 15 years of age are married, 82% speak English and 15% speak Spanish. 67% of Abilene residents were born in Texas, 25% were born out of state, 1% were born outside of the United States and 6% were foreign born.