Ontario, CA Area Codes
Ontario is served by area codes 840 and 909. It is in California, San Bernardino County. About 183,440 people live in its 4 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 840, 909 |
| State / province | California |
| County | San Bernardino County |
| Population | 183,440 |
| ZIP codes | 4 |
| Time zone | Pacific |
| Coordinates | 34.0581, -117.6293 |
What area code is Ontario in?
ZIP codes in the code footprint
Nearby towns and their area codes
Montclair 840, 909Upland 840, 909Chino 840, 909Rancho Cucamonga 840, 909Claremont 840, 909Mira Loma 951Pomona 840, 909La Verne 840, 909
How to dial
Dial 840 + 7 digits for a number in Ontario, or +1 840 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.