Lake Forest, IL Profile: Facts, Map & Data


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Lake Forest, Illinois - Basic Facts

The City of Lake Forest had a population of 19,270 as of July 1, 2017.

The primary coordinate point for Lake Forest is located at latitude 42.2379 and longitude -87.8589 in Lake County. The formal boundaries for the City of Lake Forest (see map below) encompass a land area of 17.19 sq. miles and a water area of 0.07 sq. miles. Lake County is in the Central time zone (GMT -6). The elevation is 686 feet.

The City of Lake Forest (GNIS ID: 2395590) 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 Lake Forest is located within Township of West Deerfield, a minor civil division (MCD) of Lake County.

Beneath the boundary map are tables with Lake Forest population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of Lake Forest, IL Boundary Map

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Boundary Maps: Township of West Deerfield | Lake County | Illinois Counties

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Lake Forest, IL Data & Demographics (As of July 1, 2017)


Total Population 19,270
Daytime Population: Workers 18,503
Daytime Population: Residents 11,066
Total Daytime Population (TDP) 29,569
Ratio TDP/Total Population1 1.53
Population in Households 18,188
Population in Familes 16,252
Population in Group Qrtrs 1,082
Population Density2 1,121
Diversity Index3 24


Median Household Income $165,232
Average Household Income $235,700
Per Capita Income $85,766


Total Housing Units 7,587 (100%)
Owner Occupied HU 5,829 (76.8%)
Renter Occupied HU 1,038 (13.7%)
Vacant Housing Units 720 ( 9.5%)
Median Home Value $928,980
Average Home Value $904,323


Total Households 6,867
Average Household Size 2.65
Family Households 5,230
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. 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 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.


2010-2017 2017-2022
Population -0.07% 0.11%
Households 0.21% 0.19%
Families -0.04% 0.11%
Median Household Income   0.57%
Per Capita Income   1.38%

Lake Forest, IL - Peer Comparisons by Rank and Percentile

The table below compares Lake Forest to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2017 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 # 130 91st
Population Density # 690 50th
Diversity Index # 428 69th
Median Household Income # 9 99th
Per Capita Income # 4 100th

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

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