Troy, AL has a population of 18,944 and is the 2,307th largest city in the United States. The population density is 671 per sq mi which is 630% higher than the Alabama average and 641% higher than the national average. The median age in Troy is 26 which is approximately 33% lower than the Alabama average of 39. In Troy, 37% of the population over 15 years of age are married, 94% speak English and 1% speak Spanish. 74% of Troy residents were born in Alabama, 20% were born out of state, 1% were born outside of the United States and 5% were foreign born.