Merrifield, VA has a population of 17,000 and is the 2,522nd largest city in the United States. The population density is 6,303 per sq mi which is 3194% higher than the Virginia average and 6857% higher than the national average. The median age in Merrifield is 33 which is approximately 12% lower than the Virginia average of 38. In Merrifield, 48% of the population over 15 years of age are married, 51% speak English and 9% speak Spanish. 21% of Merrifield residents were born in Virginia, 35% were born out of state, 2% were born outside of the United States and 43% were foreign born.