Overview
Winnebago County sits in northern Illinois, anchored by Rockford, the state's third-largest city. With a population of 283,289 (Census ACS 5-Year, 2023), it ranks larger than 92% of U.S. counties and 93% of Illinois counties. It's a mid-sized urban county with a manufacturing legacy, a median household income below the state middle, and health outcomes that trail national averages on several key measures.
The county's median age is 39.7 years (Census ACS 5-Year, 2023), younger than about two-thirds of U.S. counties. Its workforce of 130,021 people (BLS LAUS, 2025) places it among the largest labor markets in the state. But size doesn't translate to prosperity across the board: the poverty rate sits at 15.8% (Census ACS 5-Year, 2023), higher than roughly 69% of counties nationwide.
Demographics
Winnebago County is more diverse than most of Illinois. White residents make up 64.8% of the population, Black residents 12.9%, Hispanic residents 15.0%, and Asian residents 2.8% (Census ACS 5-Year, 2023). The Hispanic share is higher than 82% of U.S. counties, and the Black population share exceeds that of 79% of counties nationally. Native American residents account for less than 0.5%.
The median age of 39.7 (Census ACS 5-Year, 2023) falls in the younger third of U.S. counties. That tracks with a sizable school-age population and a labor force that remains substantial relative to total population.
Educational attainment runs below state norms. Just 24.6% of adults 25 and older hold a bachelor's degree or higher (Census ACS 5-Year, 2023), which ranks at the 73rd state level but only the 63rd nationally. Illinois is a highly educated state, so clearing average here still means trailing the broader national picture for metro-adjacent counties of this size.
Education
Per-pupil spending in Winnebago County is $18,032 (Education Data Portal, 2020), well above the national average of roughly $15,000. Total enrollment stands at 42,747 students (Education Data Portal, 2021), ranking higher than 92% of U.S. counties by enrollment size.
The student-teacher ratio is 15.6:1 (Education Data Portal, 2021), close to the national average of about 15.5:1 and higher than 75% of counties nationally. Within Illinois, that ratio exceeds 94% of counties, suggesting larger class sizes relative to state peers.
The spending level is notable. At $18,032 per student, the county invests more than three-quarters of U.S. counties. Whether that investment closes the gap on bachelor's attainment rates remains an open question, given only 24.6% of adults hold a four-year degree (Census ACS 5-Year, 2023).
Economy & Employment
Median household income is $64,363 (Census ACS 5-Year, 2023). That sits near the national midpoint, higher than 52% of U.S. counties, but lands in the lower half for Illinois at the 41st state ranking. Per capita income tells a similar story: $34,775 (Census ACS 5-Year, 2023), above 55% of counties nationally but below the state median.
The unemployment rate is 6.1% (BLS LAUS, 2025), higher than 92% of U.S. counties and 83% of Illinois counties. Out of a labor force of 130,021, some 7,975 residents are unemployed (BLS LAUS, 2025). That's a persistent weak spot. The county has a large workforce (122,046 employed), but the jobless rate runs well above both state and national norms.
Poverty adds to the picture. At 15.8% (Census ACS 5-Year, 2023), the poverty rate exceeds that of about 69% of U.S. counties and 85% of Illinois counties. Average adjusted gross income was $63,230 per return (IRS SOI, 2021), with average total income at $63,712 (IRS SOI, 2021). Those figures hover near the national median.
The county's economy generates significant aggregate income ($8.7 billion in total AGI across 137,680 tax returns), placing it in the top 10% nationally by volume (IRS SOI, 2021). The gap between aggregate wealth and individual outcomes points to income concentration that leaves a substantial share of households below the poverty line.
Housing & Cost of Living
Median home value is $155,100 (Census ACS 5-Year, 2023), lower than 61% of U.S. counties. For Illinois, that's a mid-range figure, landing at the 69th state ranking. Homes here cost far less than in the Chicago metro or the collar counties, which shapes who moves in and who stays.
Median gross rent is $986 per month (Census ACS 5-Year, 2023), higher than 71% of U.S. counties. Fair market rents tell a more current story. HUD sets the two-bedroom FMR at $1,175 (HUD Fair Market Rents, 2026), with one-bedrooms at $895, three-bedrooms at $1,555, and efficiencies at $810. Those FMRs rank higher than 75% of counties nationally for a two-bedroom, and 90% within Illinois.
The county has 124,959 total housing units, with 9,510 vacant (Census ACS 5-Year, 2023). The vacancy rate of 7.6% is lower than 85% of U.S. counties, indicating a relatively tight housing market despite modest home prices. Rent costs that rank in the upper quarter nationally, paired with incomes near the middle, create a gap. A household earning the median income of $64,363 would spend roughly 22% of gross income on a two-bedroom at fair market rent. That's within the 30% affordability threshold, but leaves little margin for families earning below the median.
Health & Wellness
Winnebago County's health outcomes run worse than most of the state on several measures. The obesity rate is 42.2% (CDC PLACES, 2023), higher than 86% of U.S. counties and 94% of Illinois counties. Diabetes prevalence is 11.7% (CDC PLACES, 2023), exceeding 65% of counties nationally and 95% of state peers.
High blood pressure affects 33.9% of adults (CDC PLACES, 2023), above 60% of U.S. counties and 87% of Illinois counties. Depression prevalence is 23.4% (CDC PLACES, 2023), near the national midpoint. Poor mental health days (18.8%) and poor physical health days (14.0%) both land in the middle of national rankings (CDC PLACES, 2023).
Preventive care usage is solid. Cholesterol screening reaches 84.3% of adults, and 76.7% report an annual checkup (CDC PLACES, 2023). Both figures rank in the upper third nationally.
The uninsured rate is 11.2% (CDC PLACES, 2023), higher than 57% of U.S. counties but better than 93% of Illinois counties. That state ranking reflects Illinois's relatively high baseline for insurance coverage.
The combination of high obesity and diabetes rates with decent preventive care access suggests the county's health challenges aren't primarily about people avoiding doctors. Chronic disease management, food access, and economic stress likely play larger roles.
Climate & Natural Disasters
Winnebago County runs cold. The average temperature is 50.2°F (NOAA Climate Data Online, 2025), putting the county in the bottom third nationally. Average highs reach 60.8°F and lows drop to 39.5°F, a spread that defines the rhythm of daily life here for much of the year.
Snowfall is real. The county gets 26.3 inches annually (NOAA Climate Data Online, 2025), above the national median, and that shows up in the federal record too. Six of the county's 19 FEMA disaster declarations have been snowstorm events, including emergency declarations in 1979, 1999, 2001, 2006, and 2008 (FEMA OpenFEMA, 2026). Winters here aren't occasional inconveniences.
Flooding is the other recurring pattern. Four flood declarations since 1973, with the most recent in September 2024 (FEMA OpenFEMA, 2026). Severe storms account for four more. At 19 total federal disaster declarations, the county sits near the middle of the national distribution, below roughly 59% of U.S. counties (FEMA OpenFEMA, 2026).
Annual precipitation is 29.5 inches (NOAA Climate Data Online, 2025), modest by national standards. But the mix of winter snow loading and spring flood risk means residents can't treat the climate as benign just because it's not extreme.
The 2024 flood declaration is recent enough to matter for insurance and infrastructure planning. Buyers should check FEMA flood maps for specific parcels before closing.
Financial Profile
Winnebago County filed 137,680 tax returns in 2021, generating $8.7 billion in total adjusted gross income (IRS SOI, 2021). That volume ranks in the top 8% nationally by return count and top 10% by aggregate income, reflecting the county's population size.
Average AGI per return was $63,230, and average total income was $63,712 (IRS SOI, 2021). Both sit near the 55th national ranking, close to the U.S. median but below the Illinois midpoint.
Banking access is limited. The FDIC reports just 4 bank branches with $331.3 million in total deposits (FDIC Summary of Deposits, 2023). That branch count is lower than 77% of U.S. counties, an unusually low figure for a county of nearly 300,000 people. The FDIC data may capture a narrow set of institutions or reflect the concentration of banking in the Rockford metro under a small number of large banks.
Social Security reaches deeply into the county. Some 64,045 residents receive OASDI benefits (SSA OASDI, 2024), a count higher than 93% of U.S. counties. That represents roughly 22.6% of the total population. With a median age of 39.7 and a poverty rate of 15.8%, Social Security likely serves as a critical income floor for a substantial portion of households.
Key Comparisons
Winnebago County occupies a specific position: large by population, moderate by income, and challenged on health outcomes.
Against U.S. counties broadly, the population (92nd nationally) and labor force (91st) rank near the top decile. Income measures cluster around the middle: median household income at the 52nd ranking, per capita income at the 55th. The poverty rate (69th) and unemployment rate (92nd) both run high.
Within Illinois, the contrasts sharpen. The county's median household income ranks at just the 41st state level, and per capita income at the 45th. Poverty (85th in state) and unemployment (83rd) are worse than most Illinois peers. Health metrics amplify the gap: obesity ranks at the 94th state level, diabetes at the 95th, and high blood pressure at the 87th.
Housing remains comparatively affordable. Home values (39th nationally) run well below the national midpoint, while rents (71st nationally, 84th in state) have climbed higher relative to local incomes.
Education spending ($18,032 per pupil) exceeds three-quarters of U.S. counties, but bachelor's attainment (24.6%) trails the state median. The county invests in its schools without yet seeing that spending reflected in adult credential rates.
The clearest pattern across the data: Winnebago County has the scale of an urban center but the economic and health indicators of a community under pressure. High unemployment, elevated poverty, and chronic disease rates all point in the same direction.
Data Sources
- Census ACS 5-Year, 2023 (population, income, housing, demographics, education attainment, commute, poverty)
- BLS LAUS, 2025 (unemployment, employment, labor force)
- CDC PLACES, 2023 (health metrics, insurance coverage)
- HUD Fair Market Rents, 2026 (fair market rents by bedroom count)
- FEMA OpenFEMA, 2026 (disaster declarations and history)
- IRS Statistics of Income, 2021 (tax returns, adjusted gross income, total income)
- FDIC Summary of Deposits, 2023 (bank branches, deposits)
- NOAA Climate Data Online, 2025 (temperature, precipitation, snowfall)
- SSA OASDI, 2024 (Social Security beneficiaries)
- Education Data Portal, 2020/2021 (per-pupil spending, enrollment, student-teacher ratio)