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 40,699 as of July 1, 2016. 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, 2016.

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

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.


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, 2016)


Total Population 40,699
Population in Households 40,482
Population in Familes 34,869
Population in Group Qrtrs 217
Population Density1 2,229
Diversity Index2 40


Total Households 14,531
Average Household Size 2.79
Family Households 10,663
Average Family Size 3


Total Housing Units 15,532 (100%)
Owner Occupied HU 11,493 (74.0%)
Renter Occupied HU 3,038 (19.6%)
Vacant Housing Units 1,001 ( 6.4%)
Median Home Value $223,221
Average Home Value $254,015


Median Household Income $79,171
Average Household Income $95,774
Per Capita Income $34,361
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population -0.01% -0.1%
Households 0.13% -0.02%
Families 0.18% -0.12%
Median Household Income   1.67%
Per Capita Income   1.52%
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.

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, 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 # 42 97th
Population Density1 # 229 83rd
Diversity Index2 # 247 82nd
Median Household Income # 151 89th
Per Capita Income # 199 86th

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