About This Place
Troy is a city in Madison County, Illinois, United States. The population was 8,524 at the 2000 census.
Troy is located at 38°43′45″N 89°53′30″W / 38.72917°N 89.89167°W / 38.72917; -89.89167 (38.729236, -89.891733).
According to the United States Census Bureau, the city has a total area of 4.2 square miles (10.8 km²), all of it land.