Fort Greely, AK has a population of 253 and is the 23,366th largest city in the United States. The population density is 2 per sq mi which is 44% higher than the Alaska average and 98% lower than the national average. The median age in Fort Greely is 16 which is approximately 52% lower than the Alaska average of 34. In Fort Greely, 56% of the population over 15 years of age are married, 78% speak English and 22% speak Spanish. 38% of Fort Greely residents were born in Alaska, 50% were born out of state, 13% were born outside of the United States and 0% were foreign born.