Lexington Park, MD has a population of 12,678 and is the 3,275th largest city in the United States. The population density is 2,255 per sq mi which is 375% higher than the Maryland average and 2389% higher than the national average. The median age in Lexington Park is 30 which is approximately 23% lower than the Maryland average of 38. In Lexington Park, 48% of the population over 15 years of age are married, 86% speak English and 7% speak Spanish. 37% of Lexington Park residents were born in Maryland, 49% were born out of state, 4% were born outside of the United States and 10% were foreign born.