What is the area code for Montclair, CA?

Montclair 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 Montclair in?

Montclair is in the Pacific time zone.

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Montclair, CA Area Codes

Montclair, California (population 37,563) uses area codes 909 and 840.

Area code909

Area code840

Time zonePacific

Local time now…

Montclair has no telephone exchange of its own in NANPA records; it is served by the Pomona exchange about 6 km away.

Montclair and nearby cities in area code 909

Carriers with Montclair numbers

67 prefixes are assigned to the Pomona exchange: 48% mobile, 18% VoIP and cable, 34% landline.

Carrier	Prefixes
AT&T Mobility	19
Frontier	9
T-Mobile	7
Verizon Wireless	6
Tpx Communications	4
Metropcs Networks	3
Bandwidth	3
Onvoy (Sinch)	3

Area codes used in Montclair

Area code	Prefixes serving Montclair	Main carriers in this code
909	51	Frontier, T-Mobile, AT&T Mobility
840	16	T-Mobile, Fractel, Onvoy (Sinch)

Montclair phone number prefixes

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

909-236 Metropcs Networks
909-242 Tpx Communications
909-263 AT&T Mobility
909-282 Lumen (Level 3)
909-298 Vonage
909-326 Bandwidth
909-374 AT&T Mobility
909-397 Frontier
909-417 Bandwidth
909-455 Verizon Wireless
909-461 Metropcs Networks
909-469 Frontier
909-508 Shelcomm
909-524 Tpx Communications
909-525 Tpx Communications
909-538 T-Mobile
909-576 AT&T Mobility
909-618 Verizon Business (MCImetro)
909-620 Frontier
909-622 Frontier
909-623 Frontier
909-629 Frontier
909-630 Frontier
909-632 Tpx Communications
909-634 Verizon Business (MCImetro)
909-643 Metropcs Networks
909-671 T-Mobile
909-706 AT&T (Teleport)
909-716 T-Mobile
909-720 AT&T Mobility
909-729 Onvoy (Sinch)
909-762 Verizon Wireless
909-764 Bandwidth
909-766 Onvoy (Sinch)
909-779 AT&T Mobility
909-784 Lumen (Level 3)
909-785 AT&T Mobility
909-802 AT&T (Pacific Bell)
909-817 T-Mobile
909-826 AT&T Mobility
909-837 Verizon Wireless
909-847 AT&T Mobility
909-865 Frontier
909-868 Frontier
909-896 AT&T Mobility
909-924 AT&T Mobility
909-928 AT&T Mobility
909-940 AT&T Mobility
909-967 AT&T Mobility
909-973 Verizon Wireless
909-992 Verizon Wireless
840-202 AT&T Mobility
840-225 AT&T Mobility
840-226 Onvoy (Sinch)
840-230 Boost Subscriberco L.L.C.
840-231 T-Mobile
840-238 AT&T Mobility
840-243 T-Mobile
840-259 AT&T Mobility
840-260 T-Mobile
840-264 AT&T Mobility
840-267 AT&T Mobility
840-275 Verizon Wireless
840-333 Fractel
840-345 Fractel
840-777 Terra Nova Telecom
840-837 Ton80 Communications

Nearby cities in area code 909

Questions

What is the area code for Montclair, CA?: Montclair 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 Montclair in?: Montclair is in the Pacific time zone.