Grayslake, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Grayslake, Illinois is 20,707 as of the 2023 American Community Survey, making it the 118th-largest city in Illinois. The median household income is $113,697, the median home value is $293,900, and the median age is 35.9.
The population has grown 0.9% since 2010 (21,066 → 21,262).
20,707
Population
1895
People / sq mi
$113,697
Median Income
$293,900
Median Home Value
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Grayslake covers 10.9 sq mi of land at 1895 people per square mile.
About Grayslake, IL
Educational attainment is the headline number in Grayslake: 59.1% of adults 25 and older have a four-year degree. With 20,707 residents, Grayslake is a city in Illinois.
The typical household earns $113,697 a year, above the US median of $78,538. Poverty is relatively low for US cities at 4.1%, below the national 12.4%. The typical home is valued at $293,900, with typical rent around $1,434.
Educational attainment is on the higher side for US cities — 59.1% of adults hold a four-year degree, above the national 35.0%. About 17.3% of workers primarily work from home, above the national 14.0%, and the average commute runs about 27 minutes each way.
The education numbers are the throughline: a college-heavy population in Grayslake usually coincides with higher incomes and a workforce concentrated in professional and information industries.
Grayslake village Population History (2010-2024)
The city of Grayslake village had a population of 21,066 in 2010 and 21,262 in 2024, a 0.9% growth over 14 years. The peak was 21,262 in 2024. Average annual growth rate: 0.07%.
21,262
Population (2024)
21,066
Population (2010)
21,262
Peak (2024)
0.07%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 21,066 |
| 2011 | 21,027 |
| 2012 | 21,150 |
| 2013 | 21,170 |
| 2014 | 21,144 |
| 2015 | 21,029 |
| 2016 | 20,969 |
| 2017 | 20,934 |
| 2018 | 20,862 |
| 2019 | 20,725 |
| 2020 | 21,218 |
| 2021 | 21,146 |
| 2022 | 21,061 |
| 2023 | 21,118 |
| 2024 | 21,262 |
Race & Ethnicity
| White | 75.7% |
| Black or African American | 8.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.7% |
| Two or More Races | 0.0% |
Economy & Income
$113,697
Median Household Income
$53,833
Per Capita Income
4.1%
Poverty Rate
4.2%
Unemployment Rate
Housing
$293,900
Median Home Value
$1,434
Median Rent
76.3%
Owner-Occupied
Education
97.2%
High School+
59.1%
Bachelor's+
Commute
2.2%
Drive Alone
70.2%
Public Transit
17.3%
Work From Home
27.4 min
Avg Commute
Community Profile
24.0%
Foreign Born
85.2%
Non-English at Home
6.2%
Veterans
9.2%
With Disability
96.6%
Health Insurance
97.9%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 26.8% |
| Manufacturing | 16.4% |
| Finance, Insurance & Real Estate | 11.6% |
| Education, Health Care & Social Services | 7.9% |
| Arts, Entertainment & Food Services | 5.3% |
| Information | 5.1% |
| Retail Trade | 4.0% |
| Public Administration | 3.0% |
| Construction | 2.0% |
| Transportation & Warehousing | 1.1% |
| Agriculture & Mining | 0.2% |
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Frequently Asked Questions
Grayslake, Illinois has a population of 20,707 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 118th-largest city in Illinois.
The median household income in Grayslake, Illinois is $113,697, with 4.1% of residents living below the federal poverty level.
The median home value in Grayslake, Illinois is $293,900, with median monthly rent at $1,434 and a homeownership rate of 76.3%.
The median age in Grayslake, Illinois is 35.9 years. The population is 50.9% male and 49.1% female.
The population has grown 0.9% since 2010 (21,066 → 21,262).
Grayslake village, IL Climate
Grayslake village, IL has an average annual temperature of 8.5°C (47°F) and receives about 895 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
8.5°C
Avg Temp
895
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 20° | 42 mm |
| February | -4° / 25° | 32 mm |
| March | 2° / 35° | 64 mm |
| April | 8° / 46° | 91 mm |
| May | 14° / 57° | 86 mm |
| June | 19° / 67° | 97 mm |
| July | 22° / 72° | 101 mm |
| August | 21° / 70° | 104 mm |
| September | 17° / 63° | 96 mm |
| October | 11° / 51° | 61 mm |
| November | 3° / 38° | 66 mm |
| December | -3° / 26° | 55 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 Grayslake village, IL
The most comfortable months to visit Grayslake village, IL are typically August, July and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 28°C high). The coldest is January (near -11°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.