Ontario Oregon ZIP Codes

Ontario holds a single ZIP code.

Every ZIP code in Ontario

The complete list of Ontario, Oregon ZIP codes with the county each falls in.
ZIP code	County
97914	Malheur 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 15 July 2026. 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 979. Those first three digits identify the sectional center facility that processes mail for this part of Oregon. Statewide that range covers 16 ZIP codes, so Ontario accounts for 6% of it.

Every Oregon 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 Oregon area codes in full →

Where Ontario's ZIP codes sit

Each point is one Ontario ZIP code, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Cities near Ontario

The closest places to Ontario with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Nyssa Oregon ZIP codes	10 mi	1 ZIP code
Vale Oregon ZIP codes	14 mi	1 ZIP code
Adrian Oregon ZIP codes	20 mi	1 ZIP code
Huntington Oregon ZIP codes	27 mi	1 ZIP code
Richland Oregon ZIP codes	52 mi	1 ZIP code
Halfway Oregon ZIP codes	59 mi	1 ZIP code
Unity Oregon ZIP codes	67 mi	1 ZIP code
Baker City Oregon ZIP codes	67 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance.