909
Covers southern California
In service since 1992
Overlay with 840
City facts
Rancho Cucamonga area codes
Area codes for southern California: history, overlays and how to dial.
909840
Rancho Cucamonga uses area codes 909 and 840. Because more than one area code serves the same area, local calls need all ten digits.
About these area codes
840
Covers southern California
In service since 1992
Overlay with 909
How to call a number in Rancho Cucamonga
Inside the US
1 (909) 555-0123Dial 1, the area code, then the seven-digit number.Local call
(909) 555-0123Overlay area: always include the area code.From outside the US
+1 909 555 0123Use your country's exit code or +, then 1 for the US.Rancho Cucamonga is on Pacific Time (PT); check the time before calling from another zone.
Other cities that share these codes
Nearby area codes
| Area code | Used in | Distance |
|---|---|---|
| 951 | Jurupa Valley | 10 mi |
| 760 | San Bernardino | 17 mi |
| 626 | West Covina | 20 mi |
| 442 | Hesperia | 24 mi |
| 562 | Fullerton | 25 mi |
| 657 | Fullerton | 25 mi |
| 714 | Fullerton | 25 mi |
| 949 | Santa Ana | 29 mi |
Rancho Cucamonga quick facts
Rancho Cucamonga was incorporated as a city on November 30, 1977.
Incorporated1977November 30, 1977 · city
CountySan Bernardino CountyCalifornia
Area codes909, 840Population174,693Census ACS estimateZIP codes491701, 91730, 91737…Elevation1,207 ft368 m
Time zonePacific TimePT
Dates, namesake and elevation from Wikipedia: Rancho Cucamonga, California and Wikidata (checked 2026-11-08); population and ZIP codes from the U.S. Census Bureau.
Questions
What area code is Rancho Cucamonga?
Rancho Cucamonga uses area codes 909 and 840. Because more than one area code serves the same area, local calls need all ten digits.
When did area code 909 start?
Area code 909 dates from 1992.
When did area code 840 start?
Area code 840 dates from 1992.
Do I need to dial the area code for local calls in Rancho Cucamonga?
Yes. 909 and 840 share the same area as an overlay, so every local call needs the area code plus the seven-digit number (ten digits).
What time zone is area code 909 in?
Rancho Cucamonga is on Pacific Time (PT).
What other cities use area code 909?
Other cities in this network that share 909 and 840 include Fontana, Corona, San Bernardino, West Covina, Moreno Valley.
Sources: Area codes 909 and 840, Area codes 909 and 840 (Wikipedia) and Wikidata, checked 2026-11-08. Numbering plans change; the North American Numbering Plan Administrator is the official record.