McNair, VA has a population of 20,983 and is the 2,066th largest city in the United States. The population density is 10,276 per sq mi which is 5269% higher than the Virginia average and 11242% higher than the national average. The median age in McNair is 32 which is approximately 16% lower than the Virginia average of 38. In McNair, 58% of the population over 15 years of age are married, 41% speak English and 8% speak Spanish. 23% of McNair residents were born in Virginia, 30% were born out of state, 2% were born outside of the United States and 46% were foreign born.