Blacksburg, VA has a population of 43,973 and is the 930th largest city in the United States. The population density is 2,235 per sq mi which is 1068% higher than the Virginia average and 2367% higher than the national average. The median age in Blacksburg is 22 which is approximately 42% lower than the Virginia average of 38. In Blacksburg, 24% of the population over 15 years of age are married, 83% speak English and 3% speak Spanish. 42% of Blacksburg residents were born in Virginia, 41% were born out of state, 2% were born outside of the United States and 15% were foreign born.