Fairfield, TX has a population of 2,905 and is the 8,969th largest city in the United States. The population density is 532 per sq mi which is 449% higher than the Texas average and 487% higher than the national average. The median age in Fairfield is 40 which is approximately 18% higher than the Texas average of 34. In Fairfield, 59% of the population over 15 years of age are married, 88% speak English and 11% speak Spanish. 80% of Fairfield residents were born in Texas, 13% were born out of state, 0% were born outside of the United States and 7% were foreign born.