Colchester Flag

Colchester

County Seat:
No
Area (mi²):
1.15
State:
Illinois

Colchester is a city located in McDonough County, Illinois. Colchester has a 2026 population of 1,070. Colchester is currently declining at a rate of -0.56% annually and its population has decreased by -3.17% since the most recent census, which recorded a population of 1,105 in 2020.

The median household income in Colchester is $63,981 with a poverty rate of 7.8%. The median age in Colchester is 41.6 years: 39.6 years for males, and 45.3 years for females. For every 100 females there are 107.0 males.

1.1K
Total Population
930
Density (mi²)
-6 -0.56%
Growth

Colchester Population

Colchester Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20261,070-6-0.56%
20251,076-6-0.55%
20241,082-14-1.28%
20231,096-1-0.09%
20221,09710.09%
20211,096-9-0.81%
20201,105-6-0.54%
20191,296-13-0.99%
20181,309-15-1.13%
20171,324-26-1.93%
20161,350-13-0.95%
20151,363-8-0.58%
20141,371-15-1.08%
20131,386-10-0.72%
20121,39630.22%
20111,393-8-0.57%
20101,39710.07%

Median Age

Overall: 41.6 years
Female: 45.3 years
Male: 39.6 years

Colchester Adults

There are 881 adults, (236 of whom are seniors) in Colchester.

Sex Ratio

Female: 545 (48.3%)
Male: 583 (51.7%)

Demographics

The racial composition of Colchester includes 97.43% White, and smaller percentages for Two or more races and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White1,09997.43%
Two or more races292.57%
Race
Population ↓
Percentage (of total)
White322.84%
Two or more races30.27%
Race
Population ↓
Percentage (of total)
White1,06794.59%
Two or more races262.3%

Colchester Marital Status

Economics and Income Statistics

Colchester 's average per capita income is $40,625. Household income levels show a median of $63,981. The poverty rate stands at 7.8%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median ↓
Mean
Families$71,607$79,107
Married Families$71,607-
Households$63,981$67,648
Non Families$22,021$41,114

$40,625

Average Income

$63,981

Median Household Income

7.8%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)