Columbia

County:: Monroe County
County Seat:: No
Area (mi²):: 10.55
State:: Illinois

Columbia is a city located in Monroe County, Illinois. Columbia has a 2025 population of 10,866. Columbia is currently declining at a rate of -0.3% annually and its population has decreased by -1.51% since the most recent census, which recorded a population of 11,033 in 2020.

The average household income in Columbia is $128,441 with a poverty rate of 4.96%. The median age in Columbia is 39.9 years: 37.9 years for males, and 41.5 years for females.

Demographics

The racial composition of Columbia includes 94.44% White, and smaller percentages for Two or more races, other race, Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Other race

Black or African American

Asian

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	10,448	94.44%
Two or more races	326	2.95%
Other race	151	1.36%
Black or African American	103	0.93%
Asian	33	0.3%
Native American	2	0.02%
Native Hawaiian or Pacific Islander	0	0%

Columbia Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Columbia's average per capita income is $71,486. Household income levels show a median of $107,922. The poverty rate stands at 4.96%.

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
Married Families	$156,855	-
Families	$144,500	$158,062
Households	$107,922	$128,441
Non Families	$56,419	$62,826

$71,486

Average Income

$107,922

Median Household Income

4.96%

Poverty Rate