Troy, IL Profile: Facts, Map & Data


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Troy, Illinois - Basic Facts

The City of Troy had a population of 10,306 as of July 1, 2017. 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.

Beneath the boundary map are tables with Troy population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Troy: Columbia.

Neighborhood Data

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City of Troy, IL Boundary Map

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Boundary Maps: Township of Jarvis | Madison County | Illinois Counties

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Troy, IL Data & Demographics (As of July 1, 2017)


Total Population 10,306
Daytime Population: Workers 3,169
Daytime Population: Residents 4,699
Total Daytime Population (TDP) 7,868
Ratio TDP/Total Population1 0.76
Population in Households 10,278
Population in Familes 8,727
Population in Group Qrtrs 28
Population Density2 1,948
Diversity Index3 20


Median Household Income $75,302
Average Household Income $86,697
Per Capita Income $33,459


Total Housing Units 4,127 (100%)
Owner Occupied HU 2,830 (68.6%)
Renter Occupied HU 1,113 (27.0%)
Vacant Housing Units 185 ( 4.5%)
Median Home Value $175,353
Average Home Value $190,975


Total Households 3,942
Average Household Size 2.61
Family Households 2,830
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  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.


2010-2017 2017-2022
Population 0.57% 0.14%
Households 0.57% 0.18%
Families 0.45% 0.09%
Median Household Income   1.58%
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, 2017 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 # 221 84th
Population Density # 287 79th
Diversity Index # 494 64th
Median Household Income # 224 84th
Per Capita Income # 270 80th

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

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