Where is area code 837?

Area code 837 is in California. It covers Chico, Redding, Cameron Park, Truckee, Red Bluff, Grass Valley and 5 more cities and towns.

What time zone is area code 837?

Area code 837 is in the Pacific time zone.

Is 837 a toll-free number?

No. 837 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.

Why does 837 share its area with 530?

530 and 837 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.

Will area code 837 run out of numbers?

NANPA's latest forecast projects the 530/837 overlay to exhaust in the third quarter of 2092. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

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837 Area Code

Area code 837 serves Chico, Redding, Cameron Park, Truckee, Red Bluff and nearby communities in California. It has been in service since January 31, 2025, when it was split from 530.

StateCalifornia

Time zonePacific

Local time now…

Prefixes in use11

Overlay with530

Projected to run out2092

Cities and towns served by area code 837

Who issues 837 numbers

Mobile 0%VoIP and cable 55%Landline 45%

Share of the 11 prefixes (the three digits after 837) assigned to each type of carrier. Classification by carrier name, approximate.

Carrier	Prefixes
Onvoy (Sinch)	6
Exiant Communications	2
Wide Voice	2
Opentact	1

Cities and towns in area code 837

City	Population	Other area codes
Chico	105,081	530
Redding	94,092	530
Cameron Park	17,283	530
Truckee	17,278	530
Red Bluff	14,404	530
Grass Valley	14,035	530
Auburn	13,847	530
North Auburn	13,833	530
Diamond Springs	12,642	530
Placerville	10,685	530
Durham	6,111	530

Got a call from 837?

A 837 number was originally issued in California, but that does not prove the caller is there. 55% of 837 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 11 prefixes in area code 837

Format: (837) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

837-200 Onvoy (Sinch)
837-222 Opentact · Red Bluff
837-333 Exiant Communications · Redding
837-444 Exiant Communications · Chico
837-666 Onvoy (Sinch) · Auburn
837-776 Onvoy (Sinch) · Redding
837-777 Wide Voice · Truckee
837-800 Onvoy (Sinch) · Homewood Canyon
837-837 Onvoy (Sinch) · Hornbrook
837-888 Onvoy (Sinch) · Shingle Springs
837-999 Wide Voice · Nevada City

Questions about area code 837

Where is area code 837?: Area code 837 is in California. It covers Chico, Redding, Cameron Park, Truckee, Red Bluff, Grass Valley and 5 more cities and towns.
What time zone is area code 837?: Area code 837 is in the Pacific time zone.
Is 837 a toll-free number?: No. 837 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 837 share its area with 530?: 530 and 837 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 837 run out of numbers?: NANPA's latest forecast projects the 530/837 overlay to exhaust in the third quarter of 2092. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.