Area Code 840
Area code 840 is in California, USA , spanning 3 counties and serving 45 cities, including San Bernardino, Rancho Cucamonga or Pomona; it currently uses 107 prefixes, assigned from 840-200-XXXX through 840-999-XXXX.
In service since February 23, 2021, area code 840 is an overlay Numbering Plan Area, part of overlay complex 909/840.
The current local time is .
For exact NPA boundaries see official 840 area code map
Phone number lookup
More California area codes:
Locate any 840-NXX prefix:
| NPANXX | Area Served1 | Date2 |
|---|---|---|
| 840-200 | Chino | 1/4/2021 |
| 840-201 | Fontana | 3/11/2021 |
| 840-202 | Pomona | 7/29/2021 |
| 840-203 | San Bernardino | 7/29/2021 |
| 840-204 | San Bernardino | 7/29/2021 |
| 840-205 | Claremont | 10/27/2021 |
| 840-206 | Chino | 8/10/2021 |
| 840-207 | Arrowhead | 10/28/2021 |
| 840-208 | Claremont | 2/22/2022 |
| 840-209 | Arrowhead | 8/31/2021 |
| 840-210 | Fontana | 12/14/2021 |
| 840-212 | Chino | 11/15/2021 |
| 840-213 | Redlands | 8/12/2022 |
| 840-214 | Marshall | 8/12/2022 |
| 840-215 | Highland | 2/28/2022 |
| 840-216 | Arrowhead | 3/1/2022 |
| 840-217 | Fontana | 9/2/2022 |
| 840-218 | Chino | 10/10/2022 |
| 840-219 | Calimesa | 9/13/2021 |
| 840-220 | Rialto | 9/13/2022 |
| 840-221 | San Bernardino | 10/21/2022 |
| 840-222 | San Bernardino | 12/24/2020 |
| 840-223 | Calimesa | 10/24/2022 |
| 840-224 | San Bernardino | 12/6/2022 |
| 840-225 | Pomona | 03/10/2023 |
| 840-226 | Pomona | 04/07/2023 |
| 840-227 | San Bernardino | 04/13/2023 |
| 840-228 | Colton | 04/17/2023 |
| 840-229 | Claremont | 04/18/2023 |
| 840-230 | Pomona | 05/30/2023 |
| 840-231 | Pomona | 05/31/2023 |
| 840-232 | Fontana | 06/09/2023 |
| 840-233 | Arrowhead | 07/13/2023 |
| 840-234 | Arrowhead | 4/18/2021 |
| 840-235 | Colton | 08/11/2023 |
| 840-236 | Claremont | 09/19/2023 |
| 840-237 | Ontario | 09/19/2023 |
| 840-238 | Pomona | 09/26/2023 |
| 840-239 | Fontana | 10/02/2023 |
| 840-240 | Diamond Bar | 11/18/2022 |
| 840-241 | Rialto | 10/02/2023 |
| 840-242 | Upland | 10/02/2023 |
| 840-243 | Pomona | 10/10/2023 |
| 840-244 | Diamond Bar | 10/16/2023 |
| 840-245 | Redlands | 10/18/2023 |
| 840-246 | Etiwanda | 11/01/2023 |
| 840-247 | Highland | 11/08/2023 |
| 840-248 | Fontana | 12/05/2023 |
| 840-249 | Marshall | 12/07/2023 |
| 840-250 | Arrowhead | 01/11/2024 |
| 840-251 | Redlands | 01/19/2024 |
| 840-252 | Mentone | 2/28/2022 |
| 840-253 | Calimesa | 03/06/2024 |
| 840-254 | Rialto | 03/18/2024 |
| 840-255 | San Bernardino | 03/18/2024 |
| 840-256 | Upland | 03/28/2024 |
| 840-257 | Colton | 03/28/2024 |
| 840-258 | Highland | 04/15/2024 |
| 840-259 | Pomona | 05/09/2024 |
| 840-260 | Pomona | 05/22/2024 |
| 840-261 | Fontana | 05/29/2024 |
| 840-262 | Arrowhead | 07/30/2024 |
| 840-263 | Fontana | 09/09/2024 |
| 840-264 | Pomona | 09/20/2024 |
| 840-265 | Arrowhead | 10/09/2024 |
| 840-266 | San Bernardino | 10/09/2024 |
| 840-267 | Pomona | 10/21/2024 |
| 840-268 | Marshall | 11/12/2024 |
| 840-269 | Ontario | 01/02/2025 |
| 840-270 | Ontario | 01/06/2025 |
| 840-271 | Fontana | 01/14/2025 |
| 840-272 | Chino | 01/28/2025 |
| 840-273 | Mentone | 02/05/2025 |
| 840-274 | Arrowhead | 03/13/2025 |
| 840-275 | Pomona | 03/18/2025 |
| 840-276 | Upland | 03/27/2025 |
| 840-277 | Claremont | 03/28/2025 |
| 840-284 | Chino | 10/16/2023 |
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date.
- NXX prefixes last updated: June 3, 2025
Cities in area code 840
| City1 | County | Time Zone2 |
|---|---|---|
| Angelus Oaks | San Bernardino | P |
| Big Bear City | San Bernardino | P |
| Big Bear Lake | San Bernardino | P |
| Bloomington | San Bernardino | P |
| Blue Jay | San Bernardino | P |
| Bryn Mawr | San Bernardino | P |
| Calimesa | Riverside | P |
| Cedar Glen | San Bernardino | P |
| Cedarpines Park | San Bernardino | P |
| Chino | San Bernardino | P |
| Chino Hills | San Bernardino | P |
| Claremont | Los Angeles | P |
| Colton | San Bernardino | P |
| Crest Park | San Bernardino | P |
| Crestline | San Bernardino | P |
| Diamond Bar | Los Angeles | P |
| Fawnskin | San Bernardino | P |
| Fontana | San Bernardino | P |
| Forest Falls | San Bernardino | P |
| Green Valley Lake | San Bernardino | P |
| Guasti | San Bernardino | P |
| Highland | San Bernardino | P |
| La Verne | Los Angeles | P |
| Lake Arrowhead | San Bernardino | P |
| Loma Linda | San Bernardino | P |
| Lytle Creek | San Bernardino | P |
| Mentone | San Bernardino | P |
| Montclair | San Bernardino | P |
| Mount Baldy | Los Angeles | P |
| Ontario | San Bernardino | P |
| Patton | San Bernardino | P |
| Pomona | Los Angeles | P |
| Rancho Cucamonga | San Bernardino | P |
| Redlands | San Bernardino | P |
| Rialto | San Bernardino | P |
| Rimforest | San Bernardino | P |
| Running Springs | San Bernardino | P |
| San Bernardino | San Bernardino | P |
| San Dimas | Los Angeles | P |
| Skyforest | San Bernardino | P |
| Sugarloaf | San Bernardino | P |
| Twin Peaks | San Bernardino | P |
| Upland | San Bernardino | P |
| Walnut | Los Angeles | P |
| Yucaipa | San Bernardino | P |
- Listed above are most places served by USA area code 840. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- P stands for Pacific Time (currently ).