What is the area code for Ontario, CA?

Ontario uses 2 area codes: 909 and 840. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.

What time zone is Ontario in?

Ontario is in the Pacific time zone.

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Ontario, CA Area Codes

Ontario, California (population 187,013) uses area codes 909 and 840.

Area code909

Area code840

Time zonePacific

Local time now…

Ontario and nearby cities in area code 909

Carriers with Ontario numbers

132 prefixes are assigned to the Ontario exchange: 41% mobile, 11% VoIP and cable, 48% landline.

Carrier	Prefixes
AT&T Mobility	22
Verizon Wireless	21
Frontier	21
Metropcs Networks	15
T-Mobile	9
Tpx Communications	5
Onvoy (Sinch)	5
Lumen (Level 3)	5

Area codes used in Ontario

Area code	Prefixes serving Ontario	Main carriers in this code
909	124	Frontier, T-Mobile, AT&T Mobility
840	8	T-Mobile, Fractel, Onvoy (Sinch)

Ontario phone number prefixes

Numbers starting with these first six digits were originally assigned to the Ontario exchange.

909-208 Metropcs Networks
909-210 AT&T Mobility
909-212 Tpx Communications
909-214 AT&T Mobility
909-215 AT&T Mobility
909-218 Twc Ip Enabled Services
909-223 AT&T Mobility
909-224 AT&T Mobility
909-225 AT&T Mobility
909-226 AT&T Mobility
909-227 AT&T Mobility
909-228 AT&T Mobility
909-229 Verizon Wireless
909-230 Tpx Communications
909-234 AT&T Mobility
909-235 Metropcs Networks
909-238 Verizon Wireless
909-239 Verizon Wireless
909-240 Verizon Wireless
909-241 Verizon Wireless
909-249 Spok
909-259 Peerless Network
909-260 Verizon Wireless
909-261 Verizon Wireless
909-262 AT&T Mobility
909-268 T-Mobile
909-284 Metropcs Networks
909-286 AT&T Mobility
909-292 Tpx Communications
909-295 Metropcs Networks
909-309 Spok
909-319 T-Mobile
909-321 Lumen (CenturyLink)
909-322 Metropcs Networks
909-331 Verizon Business (MCImetro)
909-354 Verizon Wireless
909-376 T-Mobile
909-390 Frontier
909-391 Frontier
909-395 Frontier
909-400 Utility Telecom Group
909-405 Spok
909-408 Metropcs Networks
909-418 AT&T (Pacific Bell)
909-437 T-Mobile
909-443 Onvoy (Sinch)
909-456 Lumen (Level 3)
909-457 Utility Telecom Group
909-458 Frontier
909-459 Frontier
909-460 Frontier
909-467 Frontier
909-472 AT&T (Teleport)
909-489 T-Mobile
909-490 T-Mobile
909-509 AT&T Mobility
909-510 Paetec Itel
909-518 Verizon Wireless
909-519 Verizon Wireless
909-544 Verizon Wireless
909-545 Metropcs Networks
909-563 Matrix Telecom. S/I/I Tnci
909-564 American Messaging Services
909-604 American Messaging Services
909-605 Frontier
909-615 AT&T Mobility
909-635 Tpx Communications
909-638 Verizon Wireless
909-657 Lumen (Level 3)
909-661 North County Communication Corporation
909-669 Shelcomm
909-673 Frontier
909-678 Metropcs Networks
909-687 T-Mobile
909-702 AT&T Mobility
909-704 Metropcs Networks
909-717 Metropcs Networks
909-721 T-Mobile
909-724 Lumen (Level 3)
909-730 Verizon Wireless
909-731 Verizon Wireless
909-732 Verizon Wireless
909-738 Metropcs Networks
909-740 Matrix Telecom. S/I/I Tnci
909-750 Tpx Communications
909-757 Onvoy (Sinch)
909-772 T-Mobile
909-773 Frontier
909-778 AT&T Mobility
909-781 Verizon Wireless
909-786 Lumen (Level 3)
909-789 AT&T Mobility
909-813 AT&T Mobility
909-815 Verizon Wireless
909-816 Verizon Wireless
909-821 Metropcs Networks
909-842 33 Wireless
909-843 Matrix Telecom. S/I/I Tnci
909-850 Skyetel
909-851 AT&T Mobility
909-906 Bandwidth
909-917 Metropcs Networks
909-923 Frontier
909-930 Frontier
909-933 Frontier
909-934 33 Wireless
909-935 Matrix Telecom. S/I/I Tnci
909-937 Frontier
909-938 Verizon Wireless
909-947 Frontier
909-952 Metropcs Networks
909-957 Verizon Wireless
909-966 Fractel
909-969 At&T - Local
909-972 Lumen (Level 3)
909-974 Frontier
909-975 Frontier
909-983 Frontier
909-984 Frontier
909-986 Frontier
909-988 Frontier
909-994 Metropcs Networks
909-995 Utility Telecom Group
909-996 AT&T Mobility
840-237 Onvoy (Sinch)
840-269 Onvoy (Sinch)
840-270 AT&T Mobility
840-279 Verizon Wireless
840-295 AT&T Mobility
840-400 Fractel
840-699 Fractel
840-840 Onvoy (Sinch)

Nearby cities in area code 909

Questions

What is the area code for Ontario, CA?: Ontario uses 2 area codes: 909 and 840. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
What time zone is Ontario in?: Ontario is in the Pacific time zone.