Bethesda, MD has a population of 62,608 and is the 605th largest city in the United States. The population density is 4,721 per sq mi which is 895% higher than the Maryland average and 5111% higher than the national average. The median age in Bethesda is 43 which is approximately 13% higher than the Maryland average of 38. In Bethesda, 65% of the population over 15 years of age are married, 74% speak English and 6% speak Spanish. 14% of Bethesda residents were born in Maryland, 61% were born out of state, 2% were born outside of the United States and 23% were foreign born.