Ozaukee County GIS Maps
Ozaukee County, Wisconsin, has 91,503 residents across 41,165 parcels and covers 233 square miles. The population grew 5.9% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Ozaukee County is 55089.
Mequon is the county's largest population center. Ozaukee County also includes 8 zip codes, 7 public school districts and 31 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show parcel data, population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers, Parcels and sample data. Paid packages add full layers, analytics and database files.
Ozaukee County Trends
- Population
- 91,503▴
- Median Home Value
- $368,900▴
- K-12 Enrollment
- 13,920▴
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
Ozaukee County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
Ozaukee County Parcels
Ozaukee County has 41,165 mapped parcels. The median assessed value is $387,400. The records carry 34,534 distinct owner names. Owner names and mailing addresses are on nearly every parcel. Site addresses reach 88.1%. Assessed values reach 91.8%. Browse the interactive Ozaukee County Parcel viewer here.
Ozaukee County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 41,165 | 100% |
| Owner name | 41,165 | 100% |
| Owner mailing address | 41,159 | 99.9% |
| Site address | 36,248 | 88.1% |
| Land use code | 37,812 | 91.9% |
| Land use description | 0 | 0% |
| Assessed value | 37,808 | 91.8% |
| Land value | 37,812 | 91.9% |
| Improvement value | 37,812 | 91.9% |
| Acreage | 0 | 0% |
| Parcel boundary | 41,165 | 100% |
| Download all Ozaukee County parcels. | ||
Field coverage measured across all Ozaukee County parcel records.
Ozaukee County Population
Ozaukee County had 91,503 residents in 2020. That was 5.9% higher than in 2010. Ozaukee County added 9,186 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 393 people per square mile. Some of the county's most populated postal areas include Thiensville, Cedarburg and Grafton.
Population Trend in Ozaukee County WI
Ozaukee County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Ozaukee County Zip Codes
Ozaukee County has 8 zip codes. Some of the county's most populated zip codes include Thiensville (53092), Cedarburg (53012) and Grafton (53024). Thiensville is the largest zip by population, with about 21,052 residents or 23% of the county total. Together, the three largest zips account for about 64% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Ozaukee County WI
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 53092 | Thiensville | 21,052 | ▴ 5.1% |
| 53012 | Cedarburg | 19,027 | ▴ 5.1% |
| 53024 | Grafton | 18,291 | ▴ 10.3% |
| 53074 | Port Washington | 13,379 | ▴ 3.9% |
| 53097 | Thiensville | 7,380 | ▴ 16.8% |
| Download all zip code data | |||
Ozaukee County Zip Code populations and trends per most recent census data.
Ozaukee County Demographics
Ozaukee County has a median age of 44, which makes the county a little older than Wisconsin overall. About 21.1% of residents are under 18, while 21% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 27.7% of the population, which points to a solid working-age base. About 50.4% of adults have a bachelor's degree or higher, above the statewide figure of 32.8%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Ozaukee County WI
Median Age
44
Under 18
21.1%
Age 65+
21%
Bachelor's+
50.4%
Ozaukee County School Districts
Ozaukee County is served by 7 public school districts with 13,920 students enrolled in 2024. The largest districts on the county map are Mequon-Thiensville, Cedarburg and Port Washington-Saukville. Those three districts account for about 65% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in Ozaukee County WI
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Mequon-Thiensville School District | 3,553 | 25.5% | ▾ -0.5% |
| Cedarburg School District | 3,108 | 22.3% | ▴ 0.2% |
| Port Washington-Saukville School District | 2,415 | 17.3% | ▾ -2.5% |
| Grafton School District | 2,192 | 15.7% | ▴ 2.8% |
| Northern Ozaukee School District | 1,154 | 8.3% | ▴ 6.6% |
| Download all school district data | |||
Ozaukee County school district enrollment and trends per most recent NCES reporting data.
Ozaukee County Housing & Real Estate
Ozaukee County has a median home value of $368,900 and a median gross rent of $1,112. About 73% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Wisconsin median, while rents come in above the state average. In March 2026, the median listing price was $635,700 and homes spent about 42 days on the market.
Ozaukee County Housing Mix
Ozaukee County housing mix: owner, renter and vacant units.
Ozaukee County Housing Trends
Ozaukee County median home value and rent trend (last 5 years).
Businesses in Ozaukee County, WI
Ozaukee County has 4,998 business listings across 694 categories. The largest categories in Ozaukee County business listings are Medical Offices (142, 2.8%), Parks & Recreation (87, 1.7%), and Medical Center (78, 1.6%). The full Ozaukee County business listings dataset includes names, categories, addresses and contact details where available. Ozaukee County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Ozaukee County, WI
| Category | Businesses | Share |
|---|---|---|
| Medical Offices | 142 | 2.8% |
| Parks & Recreation | 87 | 1.7% |
| Medical Center | 78 | 1.6% |
| Real Estate Agents | 77 | 1.5% |
| Churches & Religious Organizations | 76 | 1.5% |
| Beauty Salons | 58 | 1.2% |
| Nurse Practitioner | 58 | 1.2% |
| Auto Repair | 57 | 1.1% |
| Gyms & Fitness | 56 | 1.1% |
| Insurance Agencies | 55 | 1.1% |
Ozaukee County Business Listings
| Business | Category | City |
|---|---|---|
| Opioid Treatment Center of Wisconsin | Abuse And Addiction Treatment | Mequon |
| Mequon Trail Townhomes | Accommodation | Mequon |
| Donahue & Associates | Accountant | Grafton |
| SUNringlé | Active Life | Mequon |
| HeartSpace Acupuncture | Acupuncture | Thiensville |
| Michaletz Zwief Ltd. | Advertising Agency | Grafton |
| Strong Microbials | Agricultural Service | Belgium |
| Landmark Feed Seed and Supply | Agriculture | Cedarburg |
| Dependable Express | Airport Shuttles | Mequon |
| Anne Lent, MD | Allergist | Mequon |
| Download Ozaukee County business listings | ||
Ozaukee County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Ozaukee County Basemaps
Ozaukee County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Ozaukee County Data Package
This page shows a preview of what's included in the Ozaukee County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for parcels, zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border Ozaukee County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.