Annandale, VA has a population of 43,158 and is the 950th largest city in the United States. The population density is 5,499 per sq mi which is 2774% higher than the Virginia average and 5970% higher than the national average. The median age in Annandale is 39 which is approximately 2% higher than the Virginia average of 38. In Annandale, 53% of the population over 15 years of age are married, 45% speak English and 24% speak Spanish. 25% of Annandale residents were born in Virginia, 26% were born out of state, 2% were born outside of the United States and 47% were foreign born.