Crystal Lake, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Crystal Lake, Illinois is 40,436 as of the 2023 American Community Survey, making it the 41st-largest city in Illinois. The median household income is $105,428, the median home value is $287,400, and the median age is 39.5.
The population has grown 1.8% since 2010 (40,766 → 41,513).
40,436
Population
2130
People / sq mi
$105,428
Median Income
$287,400
Median Home Value
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Crystal Lake covers 19.0 sq mi of land at 2130 people per square mile.
About Crystal Lake, IL
Homeownership is the standout figure in Crystal Lake: 78.0% of homes are owner-occupied, higher than the national rate. With 40,436 residents, Crystal Lake is a city in Illinois. It ranks #41 among cities in Illinois by population.
The typical household earns $105,428 a year, above the US median of $78,538. Poverty is relatively low for US cities at 4.1%, below the national 12.4%. Homes carry a median value of $287,400, with typical rent around $1,431.
Roughly 42.0% of adults have a bachelor’s, above the national 35.0%. Around 13.9% of workers work from home, close to the national 14.0%, and the average commute runs about 30 minutes each way.
The ownership rate anchors the housing story in Crystal Lake, and tends to move with the age structure and home-value figures above.
Crystal Lake city Population History (2010-2024)
The city of Crystal Lake city had a population of 40,766 in 2010 and 41,513 in 2024, a 1.8% growth over 14 years. The peak was 41,513 in 2024. Average annual growth rate: 0.13%.
41,513
Population (2024)
40,766
Population (2010)
41,513
Peak (2024)
0.13%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 40,766 |
| 2011 | 40,618 |
| 2012 | 40,469 |
| 2013 | 40,375 |
| 2014 | 40,439 |
| 2015 | 40,332 |
| 2016 | 40,118 |
| 2017 | 40,069 |
| 2018 | 39,993 |
| 2019 | 39,829 |
| 2020 | 40,240 |
| 2021 | 40,501 |
| 2022 | 40,676 |
| 2023 | 40,941 |
| 2024 | 41,513 |
Race & Ethnicity
| White | 85.0% |
| Black or African American | 0.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.8% |
| Two or More Races | 0.0% |
Economy & Income
$105,428
Median Household Income
$46,199
Per Capita Income
4.1%
Poverty Rate
3.2%
Unemployment Rate
Housing
$287,400
Median Home Value
$1,431
Median Rent
78.0%
Owner-Occupied
Education
94.8%
High School+
42.0%
Bachelor's+
Commute
1.9%
Drive Alone
73.1%
Public Transit
13.9%
Work From Home
29.6 min
Avg Commute
Community Profile
16.6%
Foreign Born
85.7%
Non-English at Home
4.1%
Veterans
9.4%
With Disability
96.4%
Health Insurance
98.1%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 19.6% |
| Manufacturing | 13.2% |
| Finance, Insurance & Real Estate | 11.7% |
| Education, Health Care & Social Services | 10.2% |
| Information | 8.1% |
| Construction | 7.3% |
| Retail Trade | 5.2% |
| Arts, Entertainment & Food Services | 4.4% |
| Public Administration | 3.0% |
| Transportation & Warehousing | 1.9% |
| Agriculture & Mining | 0.3% |
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City rankings
Frequently Asked Questions
Crystal Lake, Illinois has a population of 40,436 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 41st-largest city in Illinois.
The median household income in Crystal Lake, Illinois is $105,428, with 4.1% of residents living below the federal poverty level.
The median home value in Crystal Lake, Illinois is $287,400, with median monthly rent at $1,431 and a homeownership rate of 78.0%.
The median age in Crystal Lake, Illinois is 39.5 years. The population is 48.5% male and 51.5% female.
The population has grown 1.8% since 2010 (40,766 → 41,513).
Crystal Lake city, IL Climate
Crystal Lake city, IL has an average annual temperature of 8.9°C (48°F) and receives about 922 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
8.9°C
Avg Temp
922
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 20° | 39 mm |
| February | -4° / 25° | 31 mm |
| March | 2° / 36° | 64 mm |
| April | 8° / 47° | 93 mm |
| May | 15° / 59° | 91 mm |
| June | 20° / 68° | 106 mm |
| July | 23° / 73° | 104 mm |
| August | 22° / 71° | 107 mm |
| September | 17° / 63° | 99 mm |
| October | 11° / 51° | 64 mm |
| November | 3° / 38° | 71 mm |
| December | -4° / 25° | 53 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Crystal Lake city, IL
The most comfortable months to visit Crystal Lake city, IL are typically August, June and July, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -12°C low). August is usually the wettest month.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.