Troy, ID has a population of 888 and is the 15,886th largest city in the United States. The population density is 1,122 per sq mi which is 5783% higher than the Idaho average and 1139% higher than the national average. The median age in Troy is 37 which is approximately 4% higher than the Idaho average of 36. In Troy, 77% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 42% of Troy residents were born in Idaho, 54% were born out of state, 2% were born outside of the United States and 2% were foreign born.