Village · Illinois
Island Lake, Illinois
Island Lake, village, mostly in McHenry County (58.4% of its 2020 residents), with a part in Lake County, Illinois. Island Lake had 8,047 residents on July 1, 2025 by the Census Bureau's estimate, down 0.1% since 2020; the 2020 Census counted 8,051 and the ACS 2020-2024 5-year estimates put it at 8,014 (±53). GEOID 1737894.
Residents, July 2025 estimate
8,047
Census Bureau estimate (no margin published)
2020 Census count: 8,051 · ACS 2020-2024: 8,014 ±53
Median household income
$103,156
±$10,531 (90% margin)
Illinois: $83,390
Median home value
$262,500
±$18,165 (90% margin)
Illinois: $263,300
Median gross rent
$1,874
±$208 (90% margin)
Illinois: $1,274
Where is Island Lake and what county is it in?
Island Lake is a village mostly in McHenry County (58.4% of its 2020 residents), with a part in Lake County, Illinois. It covers 3.4 square miles of land, 2,390 residents per square mile in 2020.
Island Lake is in the Chicago-Naperville-Elgin, IL-IN metropolitan statistical area, which takes in 13 counties (Census Bureau delineation, July 2023).
Island Lake lies mostly within Nunda Township and reaches into Wauconda Township, towns or townships with their own local government (2020 census blocks).
| County | 2020 residents | Share |
|---|---|---|
| McHenry County | 4,700 | 58.4% |
| Lake County | 3,351 | 41.6% |
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Island Lake, and is it growing?
The Census Bureau estimates that 8,047 people lived in Island Lake on July 1, 2025, down 0.1% since 2020, a smaller fall than Illinois's (−0.8%). The 2020 Census counted 8,051 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 8,014 (±53).
| Measure | Island Lake | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 8,014 ±53 | 312,591 | no clear change |
| Households | 2,905 ±172 | 117,594 | −241 |
| Average household size | 2.74 ±0.16 | 2.64 | no clear change |
| Housing units | 3,073 ±189 | 121,329 | no clear change |
Island Lake's population since 2000
From 8,153 in 2000 to 8,047 in 2025: down 1.3%. The 2000, 2010 and 2020 figures are census counts, each for Island Lake as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Island Lake?
The median resident of Island Lake is 39.1 years old; 23.3% are under 18 and 13.9% are 65 or older. The largest group is non-Hispanic white residents at 77.1%, then Hispanic or Latino residents (of any race) at 18.1%. 12.4% of residents were born outside the United States.
| Measure | Island Lake | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.1 ±2.2 | 40.7 | −3.5 |
| Under 18 years | 23.3% ±2.9 pts | 22.7% | – |
| 65 years and over | 13.9% ±2.9 pts | 16.5% | – |
| Male | 47.6% ±3.0 pts | 50.1% | – |
| Hispanic or Latino (any race) | 18.1% ±5.9 pts | 16.1% | no clear change |
| White alone, not Hispanic | 77.1% ±5.9 pts | 76.1% | no clear change |
| Black or African American alone, not Hispanic | 0.3% ±0.4 pts | 1.4% | – |
| Asian alone, not Hispanic | 2.4% ±1.2 pts | 3.0% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.5 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.0% ±1.1 pts | 3.2% | – |
| Some other race alone, not Hispanic | 0.0% ±0.5 pts | 0.2% | – |
| Born outside the United States | 12.4% ±3.5 pts | 9.9% | no clear change |
| Speak a language other than English at home (age 5+) | 21.4% ±5.7 pts | 16.1% | – |
| Civilian veterans (age 18+) | 5.2% ±1.4 pts | 5.6% | – |
| With a disability | 7.2% ±2.2 pts | 10.1% | – |
| No health insurance coverage | 6.4% ±1.9 pts | 4.5% | no clear change |
| High school graduate or higher (age 25+) | 91.1% ±3.3 pts | 93.7% | – |
| Bachelor's degree or higher (age 25+) | 30.4% ±4.3 pts | 35.2% | no clear change |
| Graduate or professional degree (age 25+) | 7.6% ±2.3 pts | 12.0% | – |
| Lived in the same house a year earlier | 95.9% ±1.8 pts | 91.4% | – |
| Moved from another state in the past year | 0.3% ±0.3 pts | 1.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Island Lake earn?
Half of Island Lake's 2,905 households earn less than $103,156 a year (±$10,531), against $104,802 in McHenry County and $83,390 in Illinois. In 2015-2019 it was $102,507 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.7% of residents live below the poverty line.
| Measure | Island Lake | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $103,156 ±$10,531 | $104,802 | no clear change |
| Mean household income | $113,318 ±$7,430 | $130,520 | – |
| Per capita income | $41,302 ±$3,316 | $49,388 | no clear change |
| People below the poverty line | 6.7% ±3.6 pts | 6.2% | no clear change |
| Children under 18 below the poverty line | 8.1% ±7.5 pts | 8.2% | – |
| Households receiving SNAP | 4.5% ±2.1 pts | 7.4% | – |
| Households with a computer | 99.6% ±0.7 pts | 97.7% | – |
| Households with a broadband subscription | 98.6% ±1.6 pts | 95.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Island Lake?
Owners occupy 82.7% of Island Lake's occupied homes and renters 17.3%. The median owner-occupied home is valued at $262,500 by its owner (±$18,165). The median renter pays $1,874 a month including utilities, and 37.9% of renters pay 35% or more of their income on rent.
| Measure | Island Lake | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $262,500 ±$18,165 | $308,100 | +$51,928 |
| Median gross rent | $1,874 ±$208 | $1,401 | no clear change |
| Renters paying 35% or more of income on rent | 37.9% ±16.6 pts | 38.1% | no clear change |
| Median monthly owner costs, with a mortgage | $1,951 ±$115 | $2,137 | – |
| Owner-occupied homes | 82.7% ±5.7 pts | 82.7% | no clear change |
| Renter-occupied homes | 17.3% ±5.7 pts | 17.3% | – |
| Housing units | 3,073 ±189 | 121,329 | no clear change |
| Homeowner vacancy rate | 3.9% ±4.9 pts | 0.5% | – |
| Rental vacancy rate | 0.0% ±7.2 pts | 2.9% | – |
| Single-family detached homes | 76.3% ±4.3 pts | 77.3% | – |
| Mobile homes | 0.8% ±1.3 pts | 0.7% | – |
| Built 2020 or later | 0.3% ±0.4 pts | 1.1% | – |
| Built 2010 to 2019 | 2.7% ±1.1 pts | 4.4% | – |
| Built 1939 or earlier | 6.4% ±2.9 pts | 8.0% | – |
| Households with no vehicle | 1.4% ±1.0 pts | 3.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Island Lake building?
Builders took permits for 1 new housing units in Island Lake in 2025 (1 in single-family houses), 0.1 per 1,000 residents against 1.5 across Illinois.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Island Lake work and get to work?
75.5% of Island Lake's workers drive alone and 15.0% work from home. The average trip to work takes 31.9 minutes. The unemployment rate in 2020-2024 averaged 6.7%.
| Measure | Island Lake | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 73.1% ±3.9 pts | 69.7% | – |
| Unemployment rate | 6.7% ±2.8 pts | 4.7% | +4.0 pts |
| Drove alone to work | 75.5% ±4.6 pts | 72.9% | – |
| Carpooled | 7.0% ±2.8 pts | 7.7% | – |
| Public transportation | 0.4% ±0.5 pts | 1.3% | – |
| Walked | 0.0% ±0.9 pts | 1.1% | – |
| Worked from home | 15.0% ±4.6 pts | 16.1% | +12.5 pts |
| Mean travel time to work | 31.9 min ±2.1 | 30.1 min | −3.3 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Island Lake?
1 census tract lies mostly in Island Lake, and 3 more reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 8642.03Lake County | 4,356 | $107,537 |
| Tract 8708.12McHenry County | 4,266 | $93,750 |
| Tract 8708.11McHenry County | 4,438 | $86,850 |
| Tract 8642.04Lake County | 4,839 | $106,500 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Island Lake) · Census block assignment files
How does Island Lake compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Island Lake is the 3,728th-most populous of the 19,476 U.S. incorporated places that have one and the 260th-most populous of 1,294 in Illinois.
Island Lake ranks 307th of 1,380 places in Illinois with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 260th | 1,294 |
| Growth 2020-2025 (PEP) | 302nd | 1,347 |
| Residents per square mile | 214th | 1,383 |
| Median household income | 307th | 1,380 |
| Per capita income | 554th | 1,383 |
| Median home value | 339th | 1,379 |
| Median gross rent | 70th | 1,280 |
| Poverty rate | 823rd | 1,119 |
| Bachelor's degree or higher | 460th | 1,369 |
| Median age | 929th | 1,383 |
| Owner-occupied share | 451st | 1,382 |
| Work from home | 299th | 1,015 |
| Travel time to work | 171st | 1,382 |
Island Lake's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Island Lake with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Island Lake?
13 of the 57 figures for Island Lake on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Island Lake are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Island Lake.