Columbia, MD has a population of 103,439 and is the 296th largest city in the United States. The population density is 3,240 per sq mi which is 583% higher than the Maryland average and 3476% higher than the national average. The median age in Columbia is 38 which is approximately 2% 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, 43% were born out of state, 3% were born outside of the United States and 19% were foreign born.