Baltimore, MD has a population of 621,000 and is the 26th largest city in the United States. The population density is 7,672 per sq mi which is 1518% higher than the Maryland average and 8368% higher than the national average. The median age in Baltimore is 35 which is approximately 9% lower than the Maryland average of 38. In Baltimore, 36% of the population over 15 years of age are married, 91% speak English and 4% speak Spanish. 67% of Baltimore residents were born in Maryland, 24% were born out of state, 1% were born outside of the United States and 8% were foreign born.