Colchester, IL Profile: Facts, Map & Data


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Colchester, Illinois - Basic Facts

The City of Colchester had a population of 1,360 as of July 1, 2016. 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, 2016.

Alternate Unofficial Names for Colchester: Chester.

Neighborhood Data

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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, 2016)


Total Population 1,360
Population in Households 1,360
Population in Familes 1,026
Population in Group Qrtrs 0
Population Density1 1,363
Diversity Index2 5


Total Households 583
Average Household Size 2.33
Family Households 366
Average Family Size 3


Total Housing Units 676 (100%)
Owner Occupied HU 418 (61.8%)
Renter Occupied HU 165 (24.4%)
Vacant Housing Units 93 (13.8%)
Median Home Value $64,706
Average Home Value $89,234


Median Household Income $38,880
Average Household Income $46,628
Per Capita Income $20,135
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population -0.47% -0.66%
Households -0.67% -0.8%
Families -0.89% -1.0%
Median Household Income   -0.54%
Per Capita Income   0.7%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

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, 2016 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 # 617 55th
Population Density1 # 546 60th
Diversity Index2 # 1243 10th
Median Household Income # 1168 15th
Per Capita Income # 1210 12th

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