Somonauk, IL Profile: Facts, Map & Data


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Somonauk, Illinois - Basic Facts

The Village of Somonauk had a population of 1,988 as of July 1, 2016.

The primary coordinate point for Somonauk is located at latitude 41.6347 and longitude -88.6875 in DeKalb County. The formal boundaries for the Village of Somonauk (see map below) encompass a land area of 2.41 sq. miles and a water area of 0 sq. miles. DeKalb County is in the Central time zone (GMT -6). The elevation is 686 feet.

While the primary coordinates for Village of Somonauk are located in DeKalb County, it should be noted that the formal boundaries for this community also extend into and LaSalle County.

The Village of Somonauk (GNIS ID: 2399838) 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 Village of Somonauk is located within Township of Somonauk, a minor civil division (MCD) of DeKalb County.

Beneath the boundary map are tables with Somonauk population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Neighborhood Data

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Village of Somonauk, IL Boundary Map

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Somonauk, IL Data & Demographics (As of July 1, 2016)


Total Population 1,988
Population in Households 1,988
Population in Familes 1,712
Population in Group Qrtrs 0
Population Density1 823
Diversity Index2 18


Total Households 749
Average Household Size 2.65
Family Households 552
Average Family Size 3


Total Housing Units 806 (100%)
Owner Occupied HU 552 (68.5%)
Renter Occupied HU 197 (24.4%)
Vacant Housing Units 57 ( 7.1%)
Median Home Value $174,769
Average Home Value $198,687


Median Household Income $66,541
Average Household Income $76,445
Per Capita Income $27,962
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.79% 0.53%
Households 0.7% 0.5%
Families 1.18% 0.32%
Median Household Income   2.57%
Per Capita Income   1.32%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Somonauk, IL - Peer Comparisons by Rank and Percentile

The table below compares Somonauk to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2016 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 # 514 63rd
Population Density1 # 878 36th
Diversity Index2 # 515 62nd
Median Household Income # 275 80th
Per Capita Income # 487 64th

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

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