With 20,929 people, Grayslake is a city in Illinois. This is an unusually credentialed place: 58% of adults have a four-year degree. Few US cities rank higher on income. Households here earn about 37% more than in Illinois as a whole. 78% of homes are owner-occupied. Households take in $113,972 a year at the median, 39% more than the country as a whole.
At a glance
Wealthier
median household income $113,972, above the US median
US median: $82,259
Younger
median age 37.2
US median: 38.9
More educated
58% hold a bachelor's degree
US average: 36%
More affordable
home values down 12%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Grayslake
What changed most since 1990
Population7,388 → 20,929(+183%)US over the same years: +35%
Homes owned by their occupants59.4% → 78.2%(+18.8 pts)US over the same years: +0.9 pts
Adults with a bachelor's degree30.4% → 58.5%(+28.0 pts)US over the same years: +15.3 pts
Grayslake's population equals 2.9% of Lake County's. Its number of foreign-born residents equals 1.4% of the county's. Its number of veterans equals 4.4% of the county's.
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)37.6%(418)
US avg: 26.4%
Gulf War (1990s)27.2%(303)
US avg: 24.3%
Vietnam era17.1%(190)
US avg: 33.1%
Korean War10.2%(113)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 1,112 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Grayslake, decade by decade
Grayslake population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
7,388
$104,912
$267,608
30.4%
8.6
2000
18,506
$133,241
$351,397
50.8%
27.5
2010
20,957
$132,006
$370,000
54.1%
45.1
2020
21,248
$120,698
$293,071
55.5%
58.0
2024
20,929
$113,972
$309,500
58.5%
59.0
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
