California · Pacific Time
837 Area Code
Area code 837 is in California, serving northern and eastern California outside the Bay Area and Sacramento metro. It is in the Pacific Time zone. It shares its territory with overlay code 530, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 837 area code?
837 is a California area code covering northern and eastern California outside the Bay Area and Sacramento metro. In the wider directory it sits in the West region.
Cities in the 837 area code
- Redding
- Chico
- Davis
- Woodland
- Yuba City
- Marysville
- Oroville
- Paradise
- Red Bluff
- Grass Valley
- Truckee
- South Lake Tahoe
- Placerville
- Auburn
Counties served by 837
Shasta County, Butte County, Yolo County, Sutter County, Yuba County, El Dorado County, Nevada County, Placer County, Tehama County and Siskiyou County.
837 overlay codes and dialing
The 837 territory is covered by an overlay of 2 area codes: 530, 837. All of them serve the same geographic area, and the original code is 530. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 837 area code
837 went into service on January 31, 2025 as an overlay of 530, relieving number exhaustion in the Redding area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 837 a scam or spam risk?
837 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 837 number on your screen is no guarantee the caller is in Redding, CA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other California area codes
Explore more
See every code in California, compare codes across the West region, or view all Pacific Time codes. You can also browse the 8XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
837 area code FAQ
Where is the 837 area code?
The 837 area code is in California, covering northern and eastern California outside the Bay Area and Sacramento metro, in the West region.
What cities are in the 837 area code?
Cities in the 837 area code include Redding, Chico, Davis, Woodland, Yuba City, Marysville, Oroville, Paradise, Red Bluff and Grass Valley.
What time zone is 837 in?
837 is in the Pacific Time zone.
What is the overlay for the 837 area code?
837 shares its territory with 530. Both codes (530, 837) serve the same area, so 10-digit dialing is required for every call.
When did the 837 area code start?
837 went into service on January 31, 2025 as an overlay of 530.
Do I have to dial 10 digits for 837?
Yes. Because 837 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 837 a toll-free or premium code?
No. 837 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.