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Where am ILOCATED

Ozaukee County, Wisconsin

Ozaukee County, Wisconsin, has 94,346 residents (July 2025 estimate). Its county seat is Port Washington. It uses Central Time and covers 233 sq mi (603 km²) of land.

MilwaukeeMadisonGreen Bay
Ozaukee County in Wisconsin
MequonPort WashingtonCedarburgGrafton
Ozaukee County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
94,346
Land area
233 sq mi (603 km²)
County seat or government
Port Washington
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$96,996 ± $3,696
Median home value
$390,200 ± $8,212
Median rent, with utilities
$1,154 ± $33
Homes lived in by their owners
72.9% ± 1.8 points
County type
County
Metro or micro area
Milwaukee-Waukesha, WI metro areaOutlying county
Water area
883 sq mi (2,287 km²)
State
Wisconsin
County code (FIPS)
55089
Coordinates (central point)
43.501807, -87.847551
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Ozaukee County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 5321729,957 people
  2. 5309527,817 people
  3. 5309021,625 people
  4. 5309220,886 people
  5. 5301219,183 people
  6. 5302418,982 people
  7. 5307413,682 people
  8. 530977,683 people
  9. 530805,059 people
  10. 530214,537 people
  11. 530133,717 people
  12. 530043,475 people
All 13
  1. 530753,402 people

13 ZIP Code areas overlap Ozaukee County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

Ozaukee County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Towns in Ozaukee County, largest first

  1. Town of Cedarburg6,195 people
  2. Town of Grafton4,375 people
  3. Town of Fredonia1,931 people
  4. Town of Saukville1,693 people
  5. Town of Port Washington1,591 people
  6. Town of Belgium1,537 people

People counts are American Community Survey 2020–2024 5-year estimates. All towns in Wisconsin, by county

School districts in Ozaukee County, largest first

  1. Mequon-Thiensville School District28,569 people
  2. Nicolet Union High School District26,300 people
  3. Cedarburg School District21,446 people
  4. Port Washington-Saukville School District18,003 people
  5. Grafton School District15,349 people
  6. Fox Point Joint No. 2 School District7,138 people
  7. Cedar Grove-Belgium Area School District6,742 people
  8. Random Lake School District5,862 people
  9. Northern Ozaukee School District5,240 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Mequon, Wisconsin (city)25,270 people
  2. Port Washington, Wisconsin (city)12,645 people
  3. Cedarburg, Wisconsin (city)12,605 people
  4. Grafton, Wisconsin (village)12,445 people
  5. Bayside, Wisconsin (village)4,329 people
  6. Saukville, Wisconsin (village)4,267 people
  7. Thiensville, Wisconsin (village)3,299 people
  8. Belgium, Wisconsin (village)2,488 people
  9. Fredonia, Wisconsin (village)2,448 people
  10. Newburg, Wisconsin (village)1,287 people
  11. Waubeka, Wisconsin (CDP)573 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Sheboygan County, Wisconsin17 mi north
  2. Washington County, Wisconsin21 mi west
  3. Waukesha County, Wisconsin41 mi southwest
  4. Milwaukee County, Wisconsin41 mi south
  5. Oceana County, Michigan69 mi east
  6. Muskegon County, Michigan72 mi east

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.