ZIP Codes in Rancho Cucamonga, CA
Rancho Cucamonga uses 4 ZIP codes, all in San Bernardino County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 4 Rancho Cucamonga ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 91701 | standard | San Bernardino | 39,287 |
| 91730 | standard | San Bernardino | 71,613 |
| 91737 | standard | San Bernardino | 22,958 |
| 91739 | standard | San Bernardino | 41,673 |
Finding a ZIP+4 in Rancho Cucamonga
Knowing which of these 4 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Rancho Cucamonga street almost always have different ZIP+4 codes even though they share all five leading digits.
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