Ozaukee County, Wisconsin: Government Structure and Services

Ozaukee County occupies the western shore of Lake Michigan immediately north of Milwaukee, covering approximately 235 square miles across a jurisdiction of roughly 92,000 residents (U.S. Census Bureau, 2020 Decennial Census). The county operates under Wisconsin's standardized county government framework, delivering a defined set of mandated and discretionary services through elected and appointed bodies. Understanding Ozaukee County's structure requires familiarity with Wisconsin statutory requirements for county governance, the specific board composition and committee system in place, and the boundaries separating county-level authority from municipal and state functions.

Definition and Scope

Ozaukee County is one of Wisconsin's 72 counties, constituted as a unit of local government under Wisconsin Statutes Chapter 59, which governs county powers, organization, and obligations statewide. Counties in Wisconsin function as administrative arms of the state as well as autonomous local governments, a dual role that shapes both what services Ozaukee County must provide and what discretion it retains.

The county seat is Port Washington, where the primary county administrative offices are located. Ozaukee County's incorporated municipalities include the cities of Cedarburg, Mequon, Port Washington, and Grafton, along with multiple villages and towns. Each municipality retains independent governing authority for local matters; Ozaukee County's jurisdiction covers unincorporated areas directly and delivers county-wide services across all municipalities within its boundaries.

Scope limitations: This page addresses Ozaukee County's structure and services as governed by Wisconsin law. Federal programs administered locally (such as certain housing assistance programs under HUD or federally funded highway grants through the Wisconsin Department of Transportation) operate under separate federal regulatory frameworks not fully described here. Tribal government jurisdictions within Wisconsin are also outside the scope of county government authority; those are addressed separately under Wisconsin Tribal Governments.

How It Works

County Board of Supervisors

Ozaukee County's legislative body is the County Board of Supervisors, composed of elected supervisors representing single-member districts. Under Wis. Stat. § 59.10, board size is determined by population, with counties in Ozaukee's population range authorized to operate boards of varying sizes. The board sets the county budget, levies the county property tax, adopts ordinances, and approves appointments to county committees and departments.

The board operates through a standing committee structure that mirrors major service areas:

Executive/Finance Committee — budget oversight, intergovernmental relations, administrative coordination
Public Works and Highway Committee — road maintenance, county infrastructure, land records
Health and Human Services Committee — public health, social services, aging programs
Public Safety Committee — sheriff's department oversight, emergency management, justice system coordination
Parks and Planning Committee — land use, zoning administration, county parks

Elected County Officers

In addition to the board, Ozaukee County voters elect officers mandated by Wis. Stat. § 59.20, including the County Clerk, County Treasurer, District Attorney, Register of Deeds, Sheriff, and Clerk of Circuit Court. Each office carries statutory duties independent of board direction in specified areas.

The County Executive position exists in counties that adopt that form of government; Ozaukee County operates with a County Administrator rather than a separately elected county executive, placing administrative coordination under a board-appointed professional.

Service Delivery Mechanism

Property tax revenue, state shared revenues, and federal pass-through funds collectively finance county operations. The Wisconsin Department of Revenue administers the equalized value calculations that underpin property tax levy limits (Wisconsin Department of Revenue, Property Tax). Ozaukee County's property tax rate reflects the county levy as one component; municipality, school district, and special district levies appear on the same tax bill but are separate governmental assessments.

Common Scenarios

County services come into contact with residents through predictable operational contexts:

Land records and real estate transactions: The Register of Deeds records deeds, mortgages, and land contract documents. Ozaukee County maintains a land information system accessible online, satisfying requirements under Wis. Stat. § 59.72 governing land information modernization.
Civil and criminal court proceedings: The Ozaukee County Circuit Court, part of Wisconsin's unified court system under Wis. Stat. § 753, handles felony, civil, family, and small claims matters. The Clerk of Circuit Court manages case filing and records.
Public health services: The Ozaukee County Public Health Department administers communicable disease surveillance, environmental health inspections, and vital records under authority delegated by the Wisconsin Department of Health Services.
Highway maintenance: County highways designated with a "C" prefix (e.g., County Highway C) are maintained by the county. State and U.S. highways passing through the county are maintained by the state.
Social services: The Department of Health and Human Services delivers child protective services, elder benefit enrollment, and economic assistance programs funded through state and federal allocations.

Decision Boundaries

County vs. Municipal Authority

Ozaukee County and its municipalities operate in overlapping but distinct spheres. Zoning authority in unincorporated towns rests with the county under Wis. Stat. § 59.69; incorporated cities and villages adopt their own zoning ordinances under separate municipal authority (Wis. Stat. § 62.23 for cities). Residents within Port Washington city limits, for example, are subject to Port Washington zoning, not Ozaukee County zoning.

County vs. State Authority

The county administers certain state programs under delegated authority but cannot override state statutes or administrative rules. Environmental permits for activities affecting navigable waters are issued by the Wisconsin Department of Natural Resources, not the county, even when the affected land is in Ozaukee County. Similarly, professional licensing functions belong to the state, not to individual counties.

Ozaukee County vs. Adjacent Counties

Ozaukee County shares borders with Milwaukee County to the south, Washington County to the west, and Sheboygan County to the north. Cross-border service agreements (for emergency dispatch, for example) may exist but each county retains independent statutory authority within its boundaries. For a broader structural overview of how all Wisconsin counties fit within state governance, the Wisconsin county government structure reference provides comparative context, and the Wisconsin Government Authority index organizes access across the full scope of state and local government topics covered in this network.