173,307 people (2024 Census estimate, +0.9% since 2020)
435 square miles of land · 399 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
11 active community water systems list Winnebago County in the area they serve, reporting 140,888 people served in all (a system that crosses county lines counts its whole population).
| OSHKOSH WATERWORKS surface water · local government · WI4710457 | 63,000 served |
| NEENAH WATERWORKS surface water · local government · WI4710348 | 27,506 served |
| MENASHA ELEC & WATER UTIL surface water · local government · WI4710334 | 15,144 served |
| FOX CROSSING UTILITIES WEST groundwater · local government · WI4710358 | 14,000 served |
| FOX CROSSING UTILITIES EAST buys surface water · local government · WI4710453 | 10,927 served |
| ALGOMA TN SANITARY DIST 1 groundwater · local government · WI4711611 | 3,935 served |
| OMRO WATERWORKS groundwater · local government · WI4710357 | 3,629 served |
| WINNECONNE WATERWORKS groundwater · local government · WI4710354 | 2,502 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 250 people were held in Winnebago County's jail, in Vera's latest figure (2025). In 2020 it was about 215.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
5 school districts have their office in Winnebago County. School taxes are usually the largest part of a property tax bill.
Spent $210.5 million — $148.1 million to run schools, about $16,188 per student, plus $45.3 million on buildings and equipment. Money in: $65 million local (mostly property tax), $95.5 million state, $26.4 million federal. Long-term debt: $148 million.
Spent $211.1 million — $79.7 million to run schools, about $12,210 per student, plus $118.8 million on buildings and equipment. Money in: $37.3 million local (mostly property tax), $61.8 million state, $11.2 million federal. Long-term debt: $150.9 million.
Spent $63.5 million — $50.4 million to run schools, about $15,948 per student, plus $4.5 million on buildings and equipment. Money in: $29.5 million local (mostly property tax), $41.7 million state, $10.3 million federal. Long-term debt: $21.2 million.
Spent $24.4 million — $21.9 million to run schools, about $12,183 per student, plus $886,000 on buildings and equipment. Money in: $12.4 million local (mostly property tax), $12.1 million state, $2.4 million federal. Long-term debt: $11.5 million.
Spent $20.7 million — $17 million to run schools, about $15,395 per student, plus $235,000 on buildings and equipment. Money in: $7.8 million local (mostly property tax), $11.9 million state, $2.3 million federal. Long-term debt: $9.2 million.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Winnebago County about $75.3 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
265 bridges in Winnebago County: 163 in good condition, 94 fair, and 8 poor (3.0%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| CTH-FF over EIGHT MILE CREEK · built 1954 | 730 vehicles a day |
| LRD W 35TH AVE over MERRITS CREEK · built 1980 | 153 vehicles a day |
| LRD ONPRATT TRAIL over LAKE WINNEBAGO · built 1921 | 115 vehicles a day |
| LRD 9TH ST RD over SPRING BROOK · built 1932 | 82 vehicles a day |
| LRD QUIGLEY RD over LAKE POYGAN TRIB · built 1920 | 40 vehicles a day |
| LRD WOODENSHOE RD over NEENAH SLOUGH · built 1925 | 38 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $49.9 million of work in Winnebago County in fiscal 2025, about $291 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
Registration deadlines, early voting and polling places for Wisconsin are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for Winnebago County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Winnebago County built: brayden.ozark@gmail.com.
More of Wisconsin: the state government and every county in Wisconsin.
Nearby counties: Calumet County (23 mi) · Fond du Lac County (24 mi) · Outagamie County (25 mi) · Green Lake County (26 mi) · Waushara County (28 mi) · Waupaca County (31 mi).