Lake Forest, IL Profile: Facts & Data


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Lake Forest, Illinois - Basic Facts

The City of Lake Forest had a population of 19,067 as of July 1, 2020.

The primary coordinate point for Lake Forest is located at latitude 42.2586 and longitude -87.8406 in Lake County. The formal boundaries for the City of Lake Forest 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 Shields, a minor civil division (MCD) of Lake County.


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


Total Population 19,067 (100%)
Population in Households 17,943 (94.1%)
Population in Families 15,978 (83.8%)
Population in Group Quarters1 1,124 ( 5.9%)
Population Density 1,109
Diversity Index2 26


Median Household Income $193,060
Average Household Income $256,095
% of Income for Mortgage4 20%
Per Capita Income $93,734
Wealth Index5 410


Total HU (Housing Units) 7,646 (100%)
Owner Occupied HU 5,757 (75.3%)
Renter Occupied HU 1,132 (14.8%)
Vacant Housing Units 757 ( 9.9%)
Median Home Value $910,220
Average Home Value $1,095,992
Housing Affordability Index3 119


Total Households 6,889
Average Household Size 2.6
Family Households 5,209
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 -0.16% -0.18%
Households 0.18% -0.04%
Families -0.07% -0.15%
Median Household Income   0.71%
Per Capita Income   1.28%
Owner Occupied HU   -0.08%


Lake Forest, IL - Peer Comparisons by Rank and Percentile

The table below compares Lake Forest 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 # 129 91st
Population Density # 670 51st
Median Household Income # 8 99th
Housing Affordability Index # 140 10th
Per Capita Income # 4 100th
Diversity Index # 418 70th

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

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