93,956 people (2024 Census estimate, +2.5% since 2020)
233 square miles of land · 403 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.
48 active community water systems list Ozaukee County in the area they serve, reporting 64,512 people served in all (a system that crosses county lines counts its whole population).
| PORT WASHINGTON WATERWORKS surface water · local government · WI2460054 | 12,853 served |
| CEDARBURG L & W COMMISSION groundwater · local government · WI2460108 | 12,500 served |
| GRAFTON WATERWORKS groundwater · local government · WI2460111 | 12,269 served |
| MEQUON WATER UTILITY buys surface water · local government · WI2460112 | 11,152 served |
| SAUKVILLE WATERWORKS groundwater · local government · WI2460134 | 4,268 served |
| BELGIUM WATERWORKS groundwater · local government · WI2460107 | 2,493 served |
| FREDONIA WATERWORKS groundwater · local government · WI2460109 | 2,279 served |
| CONCORDIA UNIVERSITY groundwater · private · WI2460118 | 1,500 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 206 people were held in Ozaukee County's jail, in Vera's latest figure (2025). In 2020 it was about 152.
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 Ozaukee County. School taxes are usually the largest part of a property tax bill.
Spent $63.8 million — $58.2 million to run schools, about $16,338 per student, plus $689,000 on buildings and equipment. Money in: $42.7 million local (mostly property tax), $14.1 million state, $4.9 million federal. Long-term debt: $65.4 million.
Spent $43.8 million — $39.5 million to run schools, about $12,781 per student, plus $604,000 on buildings and equipment. Money in: $22.7 million local (mostly property tax), $22.7 million state, $4.1 million federal. Long-term debt: $55.7 million.
Spent $39.4 million — $34.5 million to run schools, about $13,697 per student, plus $168,000 on buildings and equipment. Money in: $18.4 million local (mostly property tax), $23.6 million state, $2.6 million federal. Long-term debt: $40.3 million.
Spent $30.7 million — $27.3 million to run schools, about $12,885 per student, plus $1.8 million on buildings and equipment. Money in: $18.5 million local (mostly property tax), $15.7 million state, $2.3 million federal. Long-term debt: $41.8 million.
Spent $17.1 million — $14.1 million to run schools, about $12,647 per student, plus $890,000 on buildings and equipment. Money in: $12.5 million local (mostly property tax), $6.4 million state, $1.1 million federal. Long-term debt: $12.1 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 Low compared with other U.S. counties. FEMA estimates natural hazards cost Ozaukee County about $33.1 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
106 bridges in Ozaukee County: 27 in good condition, 76 fair, and 3 poor (2.8%). “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.
| LRD CEDAR CREEK RD over CEDAR CREEK · built 1970 | 1,400 vehicles a day |
| LRD WILLIAMSBURG D over PIGEON CREEK · built 1970 | 235 vehicles a day |
| LRD DIXIE RD over SAUK CREEK · built 1951 | 58 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $16.4 million of work in Ozaukee County in fiscal 2025, about $180 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 Ozaukee 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 Ozaukee County built: brayden.ozark@gmail.com.
More of Wisconsin: the state government and every county in Wisconsin.
Nearby counties: Sheboygan County (17 mi) · Washington County (21 mi) · Fond du Lac County (37 mi) · Waukesha County (40 mi) · Milwaukee County (41 mi) · Dodge County (43 mi).