Troy, MT has a population of 699 and is the 17,492nd largest city in the United States. The population density is 997 per sq mi which is 14491% higher than the Montana average and 1000% higher than the national average. The median age in Troy is 58 which is approximately 45% higher than the Montana average of 40. In Troy, 63% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 40% of Troy residents were born in Montana, 59% were born out of state, 0% were born outside of the United States and 1% were foreign born.