DeKalb County IL Information


DeKalb County Subdivisions

DeKalb County IL Data & Demographics (As of July 1, 2023)


Total Population 99,635 (100%)
Population in Households 94,858 (95.2%)
Population in Families 69,659 (69.9%)
Population in Group Quarters1 4,777 ( 4.8%)
Population Density 158
Diversity Index2 58


Median Household Income $66,556
Average Household Income $89,033
% of Income for Mortgage4 19%
Per Capita Income $34,635
Wealth Index5 72
Socioeconomic Status Index6 Moderate (49.1)


Total HU (Housing Units) 41,587 (100%)
Owner Occupied HU 23,838 (57.3%)
Renter Occupied HU 14,671 (35.3%)
Vacant Housing Units 3,078 ( 7.4%)
Median Home Value $204,948
Average Home Value $230,574
Housing Affordability Index3 103


Total Households 38,509
Average Household Size 2.46
Family Households 22,730
Average Family Size 3.00
  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.


2020-2023 2023-2028
Population -0.24% -0.14%
Households 0.02% 0.13%
Families   0.04%
Median Household Income   2.61%
Per Capita Income   2.68%
Owner Occupied HU   0.35%


DeKalb County IL - Peer Comparisons by Rank and Percentile

The table below compares DeKalb County to the other 102 counties and county equivalents in Illinois by rank and percentile using July 1, 2023 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 # 20 81st
Population Density # 19 82nd
Median Household Income # 29 73rd
Housing Affordability Index # 6 6th
Per Capita Income # 39 63rd
Diversity Index # 14 87th

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

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  4. See the References & Data Sources page for more information about methodology and sources of data.