Troy, Illinois

Troy population, 2020 to 2024

Troy added 356 residents from July 2020 to July 2024, a change of +3.1%. In the latest year it moved by +89. Among 330 Illinois places of 5,000 or more, that growth ranks 33rd; the median place changed by -0.9%. The median place of 5,000+ in Illinois has 14,760 people, so Troy is 80% of it.

Troy covers 6.24 square miles of land and 0.05 of water, for 1,893 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Troy is less dense than the typical town.

What county Troy is in

All of Troy's residents live in Madison County, which had 263,017 residents in 2024. Troy holds 4.5% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Troy

1 ZIP Code Tabulation Area (ZCTA) overlaps Troy by at least 10% of the ZCTA's or the city's land: 62294. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Troy is

The Census internal point of Troy is at 38.726200, -89.893500. Springfield, the capital, is 74.0 miles N in a straight line. The nearest larger place is Glen Carbon, IL (13,883 people), 5.3 miles away. The nearest city of 100,000 or more is St. Louis, MO, 19.9 miles away.

Daylight in Troy

At 38.73° N, Troy gets about 14 h 53 min of daylight around the June solstice and 9 h 27 min around the December solstice, a swing of 5 h 26 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Troy

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Maryville, 3.9 miles away, with 8,352 people.