Cities in area code 909
909 numbers are anchored to 25 rate centers across California. Each row shows how many active prefixes the locality holds — a direct measure of its numbering footprint.
Ranked by active prefixes, the code's territory runs through Ontario, San Bernardino, Fontana, Upland, Chino, Pomona, Claremont and Colton, and 16 smaller communities down to single-prefix localities.
Metropolitan coverage: 25 rate centers belong to FCC top-100 metro areas.
Overlap note: 23 localities are shared with other area codes, so a neighbor's number may differ in its first three digits.
Clock-wise the coverage is Pacific.
A caller's real location can differ: numbers port between carriers and follow their owners when they move. Use the prefix tables to see where a specific number block was issued.
| Locality (rate center) | Active prefixes | Metro area | All codes serving it |
|---|---|---|---|
| Ontario | 124 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| San Bernardino | 88 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Fontana | 70 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Upland | 70 | Los Angeles-Long Beach-Anaheim, CA | 840, 909 |
| Chino | 55 | Los Angeles-Long Beach-Anaheim, CA | 840, 909 |
| Pomona | 51 | Los Angeles-Long Beach-Anaheim, CA | 840, 909 |
| Claremont | 50 | Los Angeles-Long Beach-Anaheim, CA | 840, 909 |
| Colton | 45 | Riverside-San Bernardino-Ontario, CA | 840, 909, 951 |
| Redlands | 38 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Rialto | 34 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Diamond Bar | 28 | Los Angeles-Long Beach-Anaheim, CA | 840, 909 |
| Highland | 20 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Marshall | 20 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Arrowhead | 19 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Calimesa | 13 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Mentone | 12 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Etiwanda | 10 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Big Bear Lake | 8 | Riverside-San Bernardino-Ontario, CA | 909 |
| Riverside | 7 | Riverside-San Bernardino-Ontario, CA | 909, 951 |
| Crestline | 7 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Big Bear City | 7 | Riverside-San Bernardino-Ontario, CA | 840, 909 |
| Running Springs | 5 | Riverside-San Bernardino-Ontario, CA | 909 |
| Hemet:hemet Da | 2 | Riverside-San Bernardino-Ontario, CA | 909, 951 |
| Corona | 2 | Riverside-San Bernardino-Ontario, CA | 909, 951 |
| Woodcrest | 1 | Riverside-San Bernardino-Ontario, CA | 909, 951 |
FAQ
What is the biggest city in area code 909?
Ontario holds the most active prefixes (124), making it the code's largest numbering locality.
How many places does 909 cover?
25 rate centers in California hold active 909 prefixes, from Ontario down to communities with a single prefix.
Does a 909 number guarantee the caller lives in one of these places?
No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.