Troy, IL Profile: Facts & Data


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Troy, Illinois - Basic Facts

The City of Troy had a population of 10,368 as of July 1, 2018. Troy ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Troy is located at latitude 38.7305 and longitude -89.8917 in Madison County. The formal boundaries for the City of Troy (see map below) encompass a land area of 5.29 sq. miles and a water area of 0.06 sq. miles. Madison County is in the Central time zone (GMT -6). The elevation is 561 feet.

The City of Troy (GNIS ID: 2397061) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Troy is located within Township of Jarvis, a minor civil division (MCD) of Madison County.

Alternate Unofficial Names for Troy: Columbia.

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  1. Troy 2018 Demographic Data
  2. Growth Rates for Troy (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Illinois Research Tools (Easy Tools & Current Data)
  3. Illinois Data Comparison Tool - 2018 Demographics

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Boundary Maps, Demographic Data, School Zones Review maps and data for the neighborhood, city, county, ZIP Code, and school zone. July 1, 2018, data includes home values, household income, percentage of homes owned, rented or vacant, etc.


Troy, IL Data & Demographics (As of July 1, 2018)


Total Population 10,368
Population in Households 10,340
Population in Familes 8,802
Population in Group Qrtrs 28
Population Density2 1,960
Diversity Index3 20


Median Household Income $76,688
Average Household Income $88,276
Per Capita Income $34,216


Total Housing Units 4,128 (100%)
Owner Occupied HU 2,873 (69.6%)
Renter Occupied HU 1,109 (26.9%)
Vacant Housing Units 146 ( 3.5%)
Median Home Value $178,852
Average Home Value $197,624


Total Households 3,982
Average Household Size 2.6
Family Households 2,851
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2018 2018-2023
Population 0.58% 0.38%
Households 0.62% 0.39%
Families 0.49% 0.29%
Median Household Income   1.43%
Per Capita Income   2.38%

Troy, IL - Peer Comparisons by Rank and Percentile

The table below compares Troy to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2018 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 219 84th
Population Density # 282 79th
Diversity Index # 488 64th
Median Household Income # 225 84th
Per Capita Income # 288 79th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

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