Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/WI/ONTARIO

Ontario ZIP code, Wisconsin

The ZIP code for Ontario, WI is 54651, and its area code is 608.

USPS city name
1 ZIP code
Overlapping the city
1 more
Population
422
Area code
608

Mail addressed to Ontario uses the ZIP code above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

Ontario in numbers

About 422 people live in Ontario, in 181 households. The median household income is $50,250 a year, 35% below the Wisconsin median of $77,485 (US: $80,734). The median owner-occupied home is valued at $141,700 (47% below the Wisconsin median), and median gross rent is $748 a month. The median age is 37.1; 12.5% of adults 25 and over hold a bachelor's degree or higher (33.4% across Wisconsin); the average commute takes 25 minutes.

Population422Ontario422
Households181Ontario181
Median age37.1Ontario37.1Wisconsin40.2US 38.9
Median household income$50,250Ontario$50,250Wisconsin$77,485US $80,734
Median home value$141,700Ontario$141,700Wisconsin$266,500US $332,700
Median gross rent$748Ontario$748Wisconsin$1,087US $1,413
Bachelor's degree or higher12.5%Ontario12.5%Wisconsin33.4%US 35.7%
Mean commute24.6 minOntario24.6 minWisconsin22.2 minUS 26.4 min
Population density420 / sq miOntario420 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Ontario village. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Ontario

ZIP codes with the USPS city name Ontario
ZIP City Type Population Median income Median home
54651 Ontario , WI Standard 1,384 $62,159 $172,800

Other ZIP codes overlapping Ontario

These ZIP codes cover part of Ontario but are addressed as somewhere else.

ZIP codes overlapping Ontario
ZIP City Type Population Median income Median home
54648 Norwalk , WI Standard 1,608 $74,250 $167,800

Map of Ontario ZIP codes

54651

The ZIP codes of Ontario, WI, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Ontario

The nearest larger towns are Wilton (532 people, 7.1 mi), Norwalk (662 people, 7.9 mi) and Cashton (1,281 people, 9.7 mi).

Towns near Ontario
TownPopulationDistance
Viroqua 4,471 18.4 mi
Sparta 9,950 18.5 mi
Tomah 9,532 18.9 mi
New Lisbon 2,562 24.0 mi
Mauston 4,248 26.2 mi
West Salem 5,330 27.5 mi
Richland Center 5,109 28.4 mi

More nearby: every ZIP code in Vernon County · Wisconsin ZIP codes

Cite this page

zipcodes.pro. “Ontario, WI ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/wi/ontario

Underlying data is public domain or openly licensed — sources, vintages and licences.