Crystal Lake, IL Profile: Facts, Map & Data


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Crystal Lake, Illinois - Basic Facts

The City of Crystal Lake had a population of 40,354 as of July 1, 2017. Crystal Lake ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Crystal Lake is located at latitude 42.2326 and longitude -88.3353 in McHenry County. The formal boundaries for the City of Crystal Lake (see map below) encompass a land area of 18.26 sq. miles and a water area of 0.61 sq. miles. McHenry County is in the Central time zone (GMT -6). The elevation is 915 feet.

The City of Crystal Lake (GNIS ID: 2393685) 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 Crystal Lake is located within Township of Algonquin, a minor civil division (MCD) of McHenry County.

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

Alternate Unofficial Names for Crystal Lake: Brooklyn, Chrystal Lake, Crystal Lake Station, Crystallake, Dearborn, North Crystal Lake, Nunda.

Neighborhood Data

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City of Crystal Lake, IL Boundary Map

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Boundary Maps: Township of Algonquin | McHenry County | Illinois Counties

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


Total Population 40,354
Daytime Population: Workers 22,331
Daytime Population: Residents 18,138
Total Daytime Population (TDP) 40,469
Ratio TDP/Total Population1 1.00
Population in Households 40,137
Population in Familes 34,571
Population in Group Qrtrs 217
Population Density2 2,210
Diversity Index3 40


Median Household Income $81,393
Average Household Income $100,488
Per Capita Income $36,036


Total Housing Units 15,447 (100%)
Owner Occupied HU 11,371 (73.6%)
Renter Occupied HU 3,039 (19.7%)
Vacant Housing Units 1,037 ( 6.7%)
Median Home Value $226,950
Average Home Value $256,246


Total Households 14,410
Average Household Size 2.79
Family Households 10,565
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 -0.12% -0.05%
Households 0.0% 0.0%
Families 0.03% -0.09%
Median Household Income   1.66%
Per Capita Income   2.31%

Crystal Lake, IL - Peer Comparisons by Rank and Percentile

The table below compares Crystal Lake 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 # 45 97th
Population Density # 226 84th
Diversity Index # 249 82nd
Median Household Income # 152 89th
Per Capita Income # 196 86th

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

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