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Assumption, IL Profile: Facts & Data

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Assumption, Illinois - Basic Facts

The City of Assumption had a population of 1,152 as of July 1, 2025.

The primary coordinate point for Assumption is located at latitude 39.5203 and longitude -89.049 in Christian County. The formal boundaries for the City of Assumption encompass a land area of 0.88 sq. miles and a water area of 0 sq. miles. Christian County is in the Central time zone (GMT -6).

The City of Assumption 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 Assumption is located within Township of Assumption, a minor civil division (MCD) of Christian County.


Jump to... (On This Page!)
  1. Assumption 2025 Demographic Data
  2. Growth Rates for Assumption (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Illinois Research Tools (Easy Tools & Current Data)
  3. Illinois Data Comparison Tool - 2025 Demographics
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Assumption, IL Data & Demographics (As of July 1, 2025)

POPULATION

Total Population 1,152 (100%)
Population in Households 1,152 (100.0%)
Population in Families 818 (71.0%)
Population in Group Quarters1 0
Population Density 1,164
Diversity Index2 18
 
 

INCOME

Median Household Income $55,403
Average Household Income $61,302
% of Income for Mortgage4 9%
Per Capita Income $27,086
Wealth Index5 37
Socioeconomic Status Index6 Moderate (52.3)
 

HOUSING

Total HU (Housing Units) 568 (100%)
Owner Occupied HU 384 (67.6%)
Renter Occupied HU 125 (22.0%)
Vacant Housing Units 59 (10.4%)
Median Home Value $81,556
Average Home Value $117,552
Housing Affordability Index3 219
 

HOUSEHOLDS

Total Households 509
Average Household Size 2.26
Family Households 271
Average Family Size 3.00
NOTES
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
  6. The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

GROWTH RATE / YEAR

 2020-2025 2025-2030
Population -0.05% -0.21%
Households -0.41% -0.24%
Families   -0.15%
Median Household Income   1.63%
Per Capita Income   1.07%
Owner Occupied HU   0.26%

Assumption, IL - Peer Comparisons by Rank and Percentile

The table below compares Assumption to the other 1,461 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2025 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 # 645 56th
Population Density # 583 60th
Median Household Income # 1266 13th
Housing Affordability Index # 1374 94th
Per Capita Income # 1367 7th
Diversity Index # 895 39th

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

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