Grissom AFB, IN has a population of 2,391 and is the 10,088th largest city in the United States. The population density is 598 per sq mi which is 233% higher than the Indiana average and 560% higher than the national average. The median age in Grissom AFB is 30 which is approximately 20% lower than the Indiana average of 37. In Grissom AFB, 46% of the population over 15 years of age are married, 94% speak English and 3% speak Spanish. 73% of Grissom AFB residents were born in Indiana, 24% were born out of state, 1% were born outside of the United States and 2% were foreign born.