Assumption Flag

Assumption

County Seat:
No
Area (mi²):
0.99
State:
Illinois

Assumption is a city located in Christian County, Illinois. Assumption has a 2026 population of 1,107. Assumption is currently declining at a rate of -0.72% annually and its population has decreased by -4.16% since the most recent census, which recorded a population of 1,155 in 2020.

The median household income in Assumption is $57,500 with a poverty rate of 11.66%. The median age in Assumption is 37.2 years: 38.9 years for males, and 35.3 years for females. For every 100 females there are 119.9 males.

1.1K
Total Population
1,118
Density (mi²)
-8 -0.72%
Growth

Assumption Population

Assumption Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20261,107-8-0.72%
20251,115-8-0.71%
20241,123-3-0.27%
20231,126-5-0.44%
20221,131-14-1.22%
20211,145-10-0.87%
20201,155-3-0.26%
20191,070-14-1.29%
20181,084-13-1.19%
20171,097-12-1.08%
20161,109-9-0.81%
20151,118-14-1.24%
20141,132-11-0.96%
20131,143-14-1.21%
20121,157-11-0.94%
20111,16800%
20101,173-1-0.09%

Median Age

Overall: 37.2 years
Female: 35.3 years
Male: 38.9 years

Assumption Adults

There are 988 adults, (174 of whom are seniors) in Assumption.

Sex Ratio

Female: 548 (45.5%)
Male: 657 (54.5%)

Demographics

The racial composition of Assumption includes 88.3% White, 3.32% Black or African American, and smaller percentages for Native Hawaiian or Pacific Islander, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White1,06488.3%
Two or more races978.05%
Black or African American403.32%
Native Hawaiian or Pacific Islander30.25%
Native American10.08%
Race
Population ↓
Percentage (of total)
Two or more races282.32%
Race
Population ↓
Percentage (of total)
White1,06488.3%
Two or more races695.73%
Black or African American403.32%
Native Hawaiian or Pacific Islander30.25%
Native American10.08%

Assumption Marital Status

Economics and Income Statistics

Assumption 's average per capita income is $60,320. Household income levels show a median of $57,500. The poverty rate stands at 11.66%.

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$100,556-
Families$77,625$86,534
Households$57,500$69,072
Non Families$48,750$50,598

$60,320

Average Income

$57,500

Median Household Income

11.66%

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)