Dumfries, VA has a population of 5,180 and is the 6,299th largest city in the United States. The population density is 3,375 per sq mi which is 1663% higher than the Virginia average and 3625% higher than the national average. The median age in Dumfries is 30 which is approximately 20% lower than the Virginia average of 38. In Dumfries, 42% of the population over 15 years of age are married, 57% speak English and 37% speak Spanish. 46% of Dumfries residents were born in Virginia, 27% were born out of state, 3% were born outside of the United States and 24% were foreign born.