Altamonte Springs, FL has a population of 42,557 and is the 963rd largest city in the United States. The population density is 4,674 per sq mi which is 1492% higher than the Florida average and 5058% higher than the national average. The median age in Altamonte Springs is 39 which is approximately 5% lower than the Florida average of 42. In Altamonte Springs, 44% of the population over 15 years of age are married, 75% speak English and 20% speak Spanish. 32% of Altamonte Springs residents were born in Florida, 45% were born out of state, 7% were born outside of the United States and 15% were foreign born.