Jacksonville, TX has a population of 14,803 and is the 2,869th largest city in the United States. The population density is 1,043 per sq mi which is 976% higher than the Texas average and 1051% higher than the national average. The median age in Jacksonville is 31 which is approximately 9% lower than the Texas average of 34. In Jacksonville, 49% of the population over 15 years of age are married, 66% speak English and 33% speak Spanish. 72% of Jacksonville residents were born in Texas, 14% were born out of state, 1% were born outside of the United States and 14% were foreign born.