Troy, Illinois
| Troy | |
| City | |
 The William W. Jarvis House, a historic site in the city.
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| Country | United States |
|---|---|
| State | Illinois |
| County | Madison |
| Coordinates | 38°43′45″N 89°53′30″W / 38.72917°N 89.89167°WCoordinates: 38°43′45″N 89°53′30″W / 38.72917°N 89.89167°W |
| Area | 5.35 sq mi (14 km2) |
| - land | 5.29 sq mi (14 km2) |
| - water | 0.06 sq mi (0 km2) |
| Population | 9,888 (2010) |
| Density | 1,865.7/sq mi (720/km2) |
| Timezone | CST (UTC-6) |
| - summer (DST) | CDT (UTC-5) |
| Postal code | 62294 |
| Area code | 618 |
   Location of Troy within Illinois
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Troy is a city in Madison County, Illinois, United States. The population was 9,888 at the 2010 census.
Troy is part of the St. Louis Metropolitan Statistical Area. Its namesake in Lincoln County, Missouri is also part of this MSA, making it (along with the two O'Fallons in Illinois and Missouri) one of the few pairs of like-named municipalities to be part of the same MSA.
Troy was platted in 1819.
Troy is located at 38°43′45″N 89°53′30″W / 38.72917°N 89.89167°W (38.729236, -89.891733).
According to the 2010 census, Troy has a total area of 5.349 square miles (13.85 km2), of which 5.29 square miles (13.70 km2) (or 98.9%) is land and 0.059 square miles (0.15 km2) (or 1.1%) is water.
As of the census of 2000, there were 8,524 people, 3,100 households, and 2,356 families residing in the city. The population density was 2,037.6 people per square mile (787.4/km²). There were 3,201 housing units at an average density of 765.2 per square mile (295.7/km²). The racial makeup of the city was 95.48% White, 1.48% African American, 0.32% Native American, 0.70% Asian, 0.38% from other races, and 1.64% from two or more races. Hispanic or Latino of any race were 1.49% of the population.
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