Round Lake, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Round Lake, Illinois is 18,588 as of the 2023 American Community Survey, making it the 133rd-largest city in Illinois. The median household income is $108,965, the median home value is $257,400, and the median age is 36.7.
The population has grown 1.5% since 2010 (18,379 → 18,654).
18,588
Population
3343
People / sq mi
$108,965
Median Income
$257,400
Median Home Value
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Round Lake covers 5.6 sq mi of land at 3343 people per square mile.
About Round Lake, IL
Round Lake is distinguished by its share of foreign-born residents, 11.0% of the population. With 18,588 residents, Round Lake is a city in Illinois.
The typical household earns $108,965 a year, above the US median of $78,538. Poverty runs at 6.0%, below the national 12.4%. Median home value is $257,400, with typical rent around $1,494.
Roughly 40.5% of adults have a bachelor’s, above the national 35.0%. About 15.3% of the workforce is home-based, above the national 14.0%, and the average commute runs about 31 minutes each way.
Round Lake village Population History (2010-2024)
The city of Round Lake village had a population of 18,379 in 2010 and 18,654 in 2024, a 1.5% growth over 14 years. The peak was 18,691 in 2020. Average annual growth rate: 0.11%.
18,654
Population (2024)
18,379
Population (2010)
18,691
Peak (2020)
0.11%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 18,379 |
| 2011 | 18,401 |
| 2012 | 18,452 |
| 2013 | 18,522 |
| 2014 | 18,590 |
| 2015 | 18,528 |
| 2016 | 18,486 |
| 2017 | 18,386 |
| 2018 | 18,214 |
| 2019 | 18,100 |
| 2020 | 18,691 |
| 2021 | 18,634 |
| 2022 | 18,571 |
| 2023 | 18,575 |
| 2024 | 18,654 |
Race & Ethnicity
| White | 51.5% |
| Black or African American | 3.1% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 3.4% |
| Two or More Races | 0.2% |
Economy & Income
$108,965
Median Household Income
$42,300
Per Capita Income
6.0%
Poverty Rate
4.8%
Unemployment Rate
Housing
$257,400
Median Home Value
$1,494
Median Rent
79.4%
Owner-Occupied
Education
87.5%
High School+
40.5%
Bachelor's+
Commute
1.5%
Drive Alone
70.2%
Public Transit
15.3%
Work From Home
31.1 min
Avg Commute
Community Profile
11.0%
Foreign Born
58.9%
Non-English at Home
3.6%
Veterans
11.1%
With Disability
94.9%
Health Insurance
99.3%
Internet Access
Employment by Industry
| Manufacturing | 19.4% |
| Professional, Scientific & Management | 16.0% |
| Finance, Insurance & Real Estate | 13.9% |
| Information | 10.3% |
| Education, Health Care & Social Services | 7.2% |
| Retail Trade | 4.9% |
| Construction | 4.2% |
| Arts, Entertainment & Food Services | 3.1% |
| Public Administration | 1.7% |
| Transportation & Warehousing | 0.9% |
| Agriculture & Mining | 0.6% |
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Frequently Asked Questions
Round Lake, Illinois has a population of 18,588 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 133rd-largest city in Illinois.
The median household income in Round Lake, Illinois is $108,965, with 6.0% of residents living below the federal poverty level.
The median home value in Round Lake, Illinois is $257,400, with median monthly rent at $1,494 and a homeownership rate of 79.4%.
The median age in Round Lake, Illinois is 36.7 years. The population is 48.9% male and 51.1% female.
The population has grown 1.5% since 2010 (18,379 → 18,654).
Where to stay in Round Lake
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.