Census-designated place · Illinois
Lake Summerset, Illinois
Lake Summerset, census-designated place, mostly in Stephenson County (51.8% of its 2020 residents), with a part in Winnebago County, Illinois. Lake Summerset had 2,342 residents in the 2020 Census, a full count; the ACS 2020-2024 5-year estimates put it at 2,364 (±410). GEOID 1741456.
Residents, 2020 Census
2,342
Census count or controlled total
ACS 2020-2024 estimate: 2,364 ±410
Median household income
$108,355
±$21,469 (90% margin)
Illinois: $83,390
Median home value
$237,300
±$27,579 (90% margin)
Illinois: $263,300
Median gross rent
$1,318
±$731 (90% margin)
Illinois: $1,274
Where is Lake Summerset and what county is it in?
Lake Summerset is a census-designated place: an unincorporated community the Census Bureau draws for counting, with no city government of its own, mostly in Stephenson County (51.8% of its 2020 residents), with a part in Winnebago County, Illinois. It covers 2.1 square miles of land, 1,105 residents per square mile in 2020.
Lake Summerset is in the Freeport, IL micropolitan statistical area (Census Bureau delineation, July 2023).
Lake Summerset lies partly within Rock Grove Township and reaches into Laona Township, Rock Run Township and Durand Township, towns or townships with their own local government (2020 census blocks).
| County | 2020 residents | Share |
|---|---|---|
| Stephenson County | 1,214 | 51.8% |
| Winnebago County | 1,128 | 48.2% |
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Lake Summerset, and is it growing?
The 2020 Census counted 2,342 residents in Lake Summerset, a full count rather than a sample. The 2020-2024 American Community Survey, a sample, estimates 2,364 (±410).
The Census Bureau publishes yearly population estimates for incorporated places only; Lake Summerset is a census-designated place, so its figures come from the ACS and the 2020 Census.
| Measure | Lake Summerset | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 2,364 ±410 | 43,768 | no clear change |
| Households | 979 ±141 | 19,358 | no clear change |
| Average household size | 2.41 ±0.27 | 2.22 | no clear change |
| Housing units | 1,113 ±155 | 21,330 | −276 |
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 Lake Summerset?
The median resident of Lake Summerset is 45.1 years old; 20.3% are under 18 and 34.9% are 65 or older. The largest group is non-Hispanic white residents at 93.2%, then Hispanic or Latino residents (of any race) at 4.9%.
| Measure | Lake Summerset | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 45.1 ±6.7 | 45.3 | no clear change |
| Under 18 years | 20.3% ±7.5 pts | 21.2% | – |
| 65 years and over | 34.9% ±8.2 pts | 24.4% | – |
| Male | 52.1% ±4.9 pts | 48.9% | – |
| Hispanic or Latino (any race) | 4.9% ±4.7 pts | 5.6% | – |
| White alone, not Hispanic | 93.2% ±5.0 pts | 78.9% | no clear change |
| Black or African American alone, not Hispanic | 1.0% ±1.6 pts | 8.5% | – |
| Asian alone, not Hispanic | 0.3% ±0.5 pts | 0.8% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±1.6 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.6 pts | 0.0% | – |
| Two or more races, not Hispanic | 0.7% ±1.1 pts | 5.6% | – |
| Some other race alone, not Hispanic | 0.0% ±1.6 pts | 0.4% | – |
| Born outside the United States | 4.3% ±4.2 pts | 2.6% | – |
| Speak a language other than English at home (age 5+) | 4.1% ±4.1 pts | 3.8% | – |
| Civilian veterans (age 18+) | 11.0% ±3.9 pts | 7.5% | – |
| With a disability | 12.3% ±4.2 pts | 15.7% | – |
| No health insurance coverage | 2.2% ±2.1 pts | 5.2% | – |
| High school graduate or higher (age 25+) | 95.8% ±3.1 pts | 92.6% | – |
| Bachelor's degree or higher (age 25+) | 30.5% ±7.9 pts | 20.7% | no clear change |
| Graduate or professional degree (age 25+) | 10.8% ±3.7 pts | 7.0% | – |
| Lived in the same house a year earlier | 91.0% ±4.5 pts | 87.6% | – |
| Moved from another state in the past year | 2.9% ±2.4 pts | 3.3% | – |
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 Lake Summerset earn?
Half of Lake Summerset's 979 households earn less than $108,355 a year (±$21,469), against $64,043 in Stephenson County and $83,390 in Illinois. In 2015-2019 it was $97,854 in 2024 dollars; the margins of error cannot tell the two periods apart.
| Measure | Lake Summerset | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $108,355 ±$21,469 | $64,043 | no clear change |
| Mean household income | $116,371 ±$12,549 | $79,920 | – |
| Per capita income | $48,818 ±$5,260 | $35,305 | no clear change |
| People below the poverty line | 3.0% ±2.6 pts | 13.9% | – |
| Children under 18 below the poverty line | 5.8% ±6.6 pts | 19.9% | – |
| Households receiving SNAP | 1.6% ±2.5 pts | 17.0% | – |
| Households with a computer | 99.3% ±1.1 pts | 91.7% | – |
| Households with a broadband subscription | 94.6% ±4.5 pts | 86.5% | – |
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 Lake Summerset?
Owners occupy 91.6% of Lake Summerset's occupied homes and renters 8.4%. The median owner-occupied home is valued at $237,300 by its owner (±$27,579). The median renter pays $1,318 a month including utilities.
| Measure | Lake Summerset | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $237,300 ±$27,579 | $134,900 | +$33,866 |
| Median gross rent | $1,318 ±$731 | $798 | no clear change |
| Renters paying 35% or more of income on rent | 42.1% ±53.2 pts | 30.2% | – |
| Median monthly owner costs, with a mortgage | $1,652 ±$500 | $1,312 | – |
| Owner-occupied homes | 91.6% ±6.1 pts | 70.9% | no clear change |
| Renter-occupied homes | 8.4% ±6.1 pts | 29.1% | – |
| Housing units | 1,113 ±155 | 21,330 | −276 |
| Homeowner vacancy rate | 0.0% ±4.1 pts | 0.5% | – |
| Rental vacancy rate | 0.0% ±34.7 pts | 4.1% | – |
| Single-family detached homes | 92.7% ±7.4 pts | 75.9% | – |
| Mobile homes | 0.0% ±3.3 pts | 3.6% | – |
| Built 2020 or later | 0.0% ±3.3 pts | 0.1% | – |
| Built 2010 to 2019 | 4.8% ±4.3 pts | 2.2% | – |
| Built 1939 or earlier | 0.6% ±1.2 pts | 33.6% | – |
| Households with no vehicle | 1.3% ±2.0 pts | 7.9% | – |
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 do people in Lake Summerset work and get to work?
84.3% of Lake Summerset's workers drive alone and 10.5% work from home. The average trip to work takes 40.2 minutes.
| Measure | Lake Summerset | Stephenson County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 56.8% ±9.4 pts | 60.6% | – |
| Unemployment rate | 15.9% ±11.4 pts | 4.3% | – |
| Drove alone to work | 84.3% ±4.8 pts | 77.9% | – |
| Carpooled | 3.2% ±4.6 pts | 7.7% | – |
| Public transportation | 0.0% ±3.7 pts | 0.6% | – |
| Walked | 2.0% ±3.1 pts | 2.0% | – |
| Worked from home | 10.5% ±5.5 pts | 10.3% | – |
| Mean travel time to work | 40.2 min ±5.2 | 20.7 min | no clear change |
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 Lake Summerset?
No census tract lies mostly in Lake Summerset; 2 tracts reach into it (2020 census blocks).
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 Lake Summerset) · Census block assignment files
How does Lake Summerset compare with other places in Illinois?
Lake Summerset ranks 250th of 1,380 places in Illinois with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population (ACS 2020-2024) | 872nd | 1,383 |
| Residents per square mile | 584th | 1,383 |
| Median household income | 250th | 1,380 |
| Per capita income | 292nd | 1,383 |
| Median home value | 430th | 1,379 |
| Median gross rent | 297th | 1,280 |
| Bachelor's degree or higher | 458th | 1,369 |
| Median age | 304th | 1,383 |
| Owner-occupied share | 160th | 1,382 |
| Work from home | 550th | 1,015 |
| Travel time to work | 10th | 1,382 |
Lake Summerset's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Lake Summerset 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 Lake Summerset?
27 of the 57 figures for Lake Summerset 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 Lake Summerset 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' school search.