Assumption, IL Profile: Facts & Data


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Assumption, Illinois - Basic Facts

The City of Assumption had a population of 1,011 as of July 1, 2020.

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 elevation is 646 feet.

The City of Assumption (GNIS ID: 2394007) 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.


Assumption, IL Data & Demographics (As of July 1, 2020)


Total Population 1,011 (100%)
Population in Households 981 (97.0%)
Population in Families 786 (77.7%)
Population in Group Quarters1 30 ( 3.0%)
Population Density 1,021
Diversity Index2 11


Median Household Income $39,500
Average Household Income $49,176
% of Income for Mortgage4 8%
Per Capita Income $20,808
Wealth Index5 41


Total HU (Housing Units) 521 (100%)
Owner Occupied HU 339 (65.1%)
Renter Occupied HU 108 (20.7%)
Vacant Housing Units 74 (14.2%)
Median Home Value $75,289
Average Home Value $90,782
Housing Affordability Index3 288


Total Households 447
Average Household Size 2.19
Family Households 286
Average Family Size 3
  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.


2010-2020 2020-2025
Population -1.43% -1.32%
Households -1.33% -1.29%
Families -1.27% -1.51%
Median Household Income   1.02%
Per Capita Income   1.55%
Owner Occupied HU   -1.15%


Assumption, IL - Peer Comparisons by Rank and Percentile

The table below compares Assumption to the other 1,369 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2020 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 # 704 49th
Population Density # 715 48th
Median Household Income # 1271 7th
Housing Affordability Index # 992 72nd
Per Capita Income # 1284 6th
Diversity Index # 839 38th

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

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