
Troy
- County:
- Madison County
- County Seat:
- No
- Area (mi²):
- 5.694
- State:
- Illinois
Troy is a city located in Madison County, Illinois. Troy has a 2025 population of 11,381. Troy is currently growing at a rate of 0.76% annually and its population has increased by 3.94% since the most recent census, which recorded a population of 10,950 in 2020.
The average household income in Troy is $114,146 with a poverty rate of 1.55%. The median age in Troy is 35.8 years: 35.2 years for males, and 36.8 years for females.