Oswego, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Oswego, Illinois is 35,463 as of the 2023 American Community Survey, making it the 52nd-largest city in Illinois. The median household income is $119,881, the median home value is $319,000, and the median age is 39.7.
The population has grown 26.5% since 2010 (30,659 → 38,778).
35,463
Population
2241
People / sq mi
$119,881
Median Income
$319,000
Median Home Value
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Oswego covers 15.8 sq mi of land at 2241 people per square mile.
About Oswego, IL
The poverty rate is what most separates Oswego from the typical city: 1.3% of residents live below the federal poverty line, against 12.4% nationally. With 35,463 residents, Oswego is a city in Illinois.
Median household income is $119,881, above the US median of $78,538. Very few residents live in poverty — 1.3%, below the national 12.4%. Homes carry a median value of $319,000, with typical rent around $1,823.
43.5% of adults 25 and older hold a bachelor’s degree, above the national average of 35.0%. A solid 16.2% of workers are based at home, above the national 14.0%, and the average commute runs about 31 minutes each way.
Oswego village Population History (2010-2024)
The city of Oswego village had a population of 30,659 in 2010 and 38,778 in 2024, a 26.5% growth over 14 years. The peak was 38,778 in 2024. Average annual growth rate: 1.71%.
38,778
Population (2024)
30,659
Population (2010)
38,778
Peak (2024)
1.71%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 30,659 |
| 2011 | 31,232 |
| 2012 | 31,806 |
| 2013 | 32,339 |
| 2014 | 33,238 |
| 2015 | 33,956 |
| 2016 | 34,463 |
| 2017 | 34,837 |
| 2018 | 35,183 |
| 2019 | 36,252 |
| 2020 | 34,744 |
| 2021 | 35,356 |
| 2022 | 35,952 |
| 2023 | 37,080 |
| 2024 | 38,778 |
Race & Ethnicity
| White | 68.7% |
| Black or African American | 12.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.8% |
| Two or More Races | 0.0% |
Economy & Income
$119,881
Median Household Income
$46,279
Per Capita Income
1.3%
Poverty Rate
1.9%
Unemployment Rate
Housing
$319,000
Median Home Value
$1,823
Median Rent
87.7%
Owner-Occupied
Education
94.8%
High School+
43.5%
Bachelor's+
Commute
0.6%
Drive Alone
73.1%
Public Transit
16.2%
Work From Home
30.5 min
Avg Commute
Community Profile
15.7%
Foreign Born
79.0%
Non-English at Home
4.0%
Veterans
7.0%
With Disability
96.4%
Health Insurance
98.8%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 28.0% |
| Manufacturing | 10.2% |
| Finance, Insurance & Real Estate | 8.7% |
| Information | 8.3% |
| Education, Health Care & Social Services | 6.2% |
| Retail Trade | 5.9% |
| Construction | 5.8% |
| Public Administration | 3.8% |
| Arts, Entertainment & Food Services | 3.4% |
| Transportation & Warehousing | 2.4% |
| Agriculture & Mining | 0.1% |
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Frequently Asked Questions
Oswego, Illinois has a population of 35,463 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 52nd-largest city in Illinois.
The median household income in Oswego, Illinois is $119,881, with 1.3% of residents living below the federal poverty level.
The median home value in Oswego, Illinois is $319,000, with median monthly rent at $1,823 and a homeownership rate of 87.7%.
The median age in Oswego, Illinois is 39.7 years. The population is 48.4% male and 51.6% female.
The population has grown 26.5% since 2010 (30,659 → 38,778).
Oswego village, IL Climate
Oswego village, IL has an average annual temperature of 9.6°C (49°F) and receives about 943 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
9.6°C
Avg Temp
943
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -6° / 21° | 39 mm |
| February | -3° / 26° | 35 mm |
| March | 3° / 37° | 66 mm |
| April | 9° / 49° | 98 mm |
| May | 16° / 60° | 99 mm |
| June | 21° / 70° | 107 mm |
| July | 23° / 74° | 99 mm |
| August | 22° / 72° | 101 mm |
| September | 18° / 64° | 95 mm |
| October | 11° / 52° | 68 mm |
| November | 4° / 39° | 77 mm |
| December | -3° / 27° | 59 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 Oswego village, IL
The most comfortable months to visit Oswego village, IL are typically June, August and July, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 30°C high). The coldest is January (near -11°C low). June 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.