Sanford, FL has a population of 57,039 and is the 697th largest city in the United States. The population density is 2,450 per sq mi which is 734% higher than the Florida average and 2604% higher than the national average. The median age in Sanford is 35 which is approximately 16% lower than the Florida average of 42. In Sanford, 44% of the population over 15 years of age are married, 75% speak English and 20% speak Spanish. 44% of Sanford residents were born in Florida, 38% were born out of state, 6% were born outside of the United States and 12% were foreign born.