Overlea, MD has a population of 11,725 and is the 3,477th largest city in the United States. The population density is 3,904 per sq mi which is 723% higher than the Maryland average and 4209% higher than the national average. The median age in Overlea is 42 which is approximately 8% higher than the Maryland average of 38. In Overlea, 55% of the population over 15 years of age are married, 89% speak English and 2% speak Spanish. 71% of Overlea residents were born in Maryland, 19% were born out of state, 1% were born outside of the United States and 9% were foreign born.