Colchester, IL Profile: Facts, Map & Data


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Colchester, Illinois - Basic Facts

The City of Colchester had a population of 1,286 as of July 1, 2018. Colchester ranks in the lower quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Colchester is located at latitude 40.4273 and longitude -90.7921 in McDonough County. The formal boundaries for the City of Colchester (see map below) encompass a land area of 1 sq. miles and a water area of 0 sq. miles. McDonough County is in the Central time zone (GMT -6). The elevation is 696 feet.

The City of Colchester (GNIS ID: 2393589) 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 Colchester is located within Township of Colchester, a minor civil division (MCD) of McDonough County.

Beneath the boundary map are tables with Colchester population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2018.

Alternate Unofficial Names for Colchester: Chester.

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City of Colchester, IL Boundary Map

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Boundary Maps: Township of Colchester | McDonough County | Illinois Counties

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


Total Population 1,286
Population in Households 1,286
Population in Familes 976
Population in Group Qrtrs 0
Population Density2 1,288
Diversity Index3 5


Median Household Income $42,526
Average Household Income $51,826
Per Capita Income $22,854


Total Housing Units 628 (100%)
Owner Occupied HU 443 (70.5%)
Renter Occupied HU 122 (19.4%)
Vacant Housing Units 63 (10.0%)
Median Home Value $69,010
Average Home Value $98,925


Total Households 565
Average Household Size 2.28
Family Households 353
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 -1.03% -1.19%
Households -0.89% -1.05%
Families -1.11% -1.22%
Median Household Income   3.43%
Per Capita Income   3.59%

Colchester, IL - Peer Comparisons by Rank and Percentile

The table below compares Colchester 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 # 629 54th
Population Density # 580 58th
Diversity Index # 1244 9th
Median Household Income # 1134 17th
Per Capita Income # 1121 18th

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

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