Ontario Wisconsin ZIP Codes
Ontario holds a single ZIP code.
Every ZIP code in Ontario
| ZIP code | County |
|---|---|
| 54651 | Vernon County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Ontario codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Ontario. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Ontario ZIP code begins 546. Those first three digits identify the sectional center facility that processes mail for this part of Wisconsin. Statewide that range covers 59 ZIP codes, so Ontario accounts for 2% of it.
Every Wisconsin ZIP prefix and the region it covers →
Area codes covering Ontario
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Ontario occupies.
Ontario Wisconsin area codes in full →
Where Ontario's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Ontario
| City | Distance | ZIP codes |
|---|---|---|
| Wilton Wisconsin ZIP codes | 7.1 mi | 1 ZIP code |
| Norwalk Wisconsin ZIP codes | 7.9 mi | 1 ZIP code |
| Cashton Wisconsin ZIP codes | 9.7 mi | 1 ZIP code |
| La Farge Wisconsin ZIP codes | 10 mi | 1 ZIP code |
| Kendall Wisconsin ZIP codes | 12 mi | 1 ZIP code |
| Hillsboro Wisconsin ZIP codes | 14 mi | 1 ZIP code |
| Westby Wisconsin ZIP codes | 14 mi | 1 ZIP code |
| Viola Wisconsin ZIP codes | 15 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.