Plain

City ZIP codes · California

Ontario, CA ZIP Codes

4 ZIP codes use the postal name Ontario, California (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 3 residential and 1 for PO boxes or a single organization. Median household income runs from $81,762 in 91764 to $100,578 in 91761, 1.2 times as much (Census Bureau, ACS 2020-2024). Ontario's most populous ZIP code is 91762, with 64,235 people (ACS 2020-2024); 95% of its land is in the city of Ontario.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Ontario's ZIP codes?

91761: $101k median household income91762: $84k median household income91764: $82k median household income91762917619176491761: $101k median household income91762: $84k median household income91764: $82k median household income91762917619176491761: $101k median household income91762: $84k median household income91764: $82k median household income917629176191764
The 3 residential ZIP codes named Ontario, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are Ontario's ZIP codes?

The highest median household income is in 91761 ($100,578), the lowest in 91764 ($81,762). Home values run from $565,800 in 91764 to $635,000 in 91761.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 3 residential ZIP codes of Ontario

Residential ZIP codes with the postal name Ontario, CA, largest first (ACS 2020-2024); sort by any column
County
91762 San Bernardino County 64,235 4,492 $84k $606k
91761 San Bernardino County 62,935 2,209 $101k $635k
91764 San Bernardino County 56,270 7,116 $82k $566k

Download the 4 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in Ontario

1 ZIP code named Ontario has no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

Ontario, CA: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
91758San Bernardino County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do Ontario's ZIP codes reach?

Ontario's residential ZIP codes lie in San Bernardino County.

Which first three digits do Ontario's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Ontario starts with 917.

Three-digit prefixes of Ontario's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Ontario's
PrefixSectional centerHereAll codes
917 Industry, CA (SCF 917) 4 64

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.