George Mason, VA has a population of 10,028 and is the 3,935th largest city in the United States. The population density is 3,951 per sq mi which is 1965% higher than the Virginia average and 4261% higher than the national average. The median age in George Mason is 21 which is approximately 44% lower than the Virginia average of 38. In George Mason, 30% of the population over 15 years of age are married, 74% speak English and 9% speak Spanish. 43% of George Mason residents were born in Virginia, 38% were born out of state, 2% were born outside of the United States and 17% were foreign born.