Columbia, MD has a population of 102,116 and is the 289th largest city in the United States. The population density is 3,198 per sq mi which is 438% higher than the Maryland average and 3430% higher than the national average. The median age in Columbia is 38 which is approximately 1% lower than the Maryland average of 38. In Columbia, 58% of the population over 15 years of age are married, 77% speak English and 7% speak Spanish. 35% of Columbia residents were born in Maryland, 44% were born out of state, 2% were born outside of the United States and 19% were foreign born.