Washington, DC has a population of 659,009 and is the 22nd largest city in the United States. The population density is 10,779 per sq mi which is 107687% higher than the District of Columbia average and 11797% higher than the national average. The median age in Washington is 34 which is approximately equal to the District of Columbia average of 34. In Washington, 34% of the population over 15 years of age are married, 83% speak English and 9% speak Spanish. 37% of Washington residents were born in District of Columbia, 47% were born out of state, 2% were born outside of the United States and 14% were foreign born.