Alachua, FL has a population of 9,553 and is the 4,074th largest city in the United States. The population density is 270 per sq mi which is 34% lower than the Florida average and 198% higher than the national average. The median age in Alachua is 34 which is approximately 18% lower than the Florida average of 42. In Alachua, 58% of the population over 15 years of age are married, 91% speak English and 4% speak Spanish. 57% of Alachua residents were born in Florida, 32% were born out of state, 3% were born outside of the United States and 8% were foreign born.