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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 103 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 .

840 area code location on a map
© OpenStreetMap contributors
For exact NPA boundaries see official 840 area code map

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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
840-284 Chino 10/16/2023
NPANXX Area Served1 Date2
840-300 Redlands 7/15/2021
840-333 Pomona 12/24/2020
840-336 Colton 2/18/2022
840-345 Pomona 7/7/2021
840-356 Arrowhead 2/18/2022
NPANXX Area Served1 Date2
840-400 Ontario 1/4/2021
840-444 Arrowhead 12/24/2020
840-465 Chino 7/7/2021
840-466 Upland 2/18/2022
NPANXX Area Served1 Date2
840-500 Bigbear City 1/27/2022
840-587 San Bernardino 2/23/2022
840-588 Diamond Bar 10/28/2021
NPANXX Area Served1 Date2
840-600 Colton 1/4/2021
840-666 Fontana 12/24/2020
840-677 Etiwanda 10/28/2021
840-688 Crestline 10/25/2021
840-699 Ontario 7/16/2021
NPANXX Area Served1 Date2
840-777 Pomona 12/23/2020
840-788 Fontana 7/16/2021
840-799 Rialto 7/15/2021
NPANXX Area Served1 Date2
840-800 Upland 12/24/2020
840-804 Claremont 01/13/2023
840-837 Pomona 1/10/2022
840-877 Marshall 7/15/2021
840-888 Redlands 12/23/2020
840-899 Highland 7/15/2021
NPANXX Area Served1 Date2
840-900 Rialto 12/24/2020
840-977 Claremont 7/15/2021
840-999 Upland 12/23/2020
  1. 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.
  2. Assignment date.
  3. NXX prefixes last updated: March 1st, 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
  1. 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.
  2. P stands for Pacific Time (currently ).
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