Area Code 840 — California

Active General Purpose Code Overlay United States

Area code 840 is located in California and operates on Pacific Time . The largest city served is San Bernardino .

Area Code Details

Area Code: 840
State / Province: California (CA)
Country: United States
Time Zone: Pacific Time Pacific Time
Local Time Now: —
Status: Active
Code Type: General Purpose Code
In Service Since: February 23, 2021
Assigned: June 13, 2019
Population Served: ~1,000,615 est.
Overlay Complex: 840/909

Cities Served

Largest City San Bernardino

San Bernardino Ontario Pomona Rialto Chino Upland Redlands Diamond Bar Colton Big Bear City

History & Relationships

Split from

Overlay complex — shares geography with

Rate Centers & Exchanges

10 rate centers identified within area code 840

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Other Area Codes in California

Nearby Area Codes

Frequently Asked Questions About Area Code 840

What state is area code 840?

Area code 840 is located in California, United States.

Where is area code 840 from?

Area code 840 originates from California. It operates in the Pacific Time zone.

What time zone is area code 840?

Area code 840 falls within the Pacific Time zone (Pacific Time).

What cities are in area code 840?

Area code 840 serves cities including San Bernardino, Ontario, Pomona, Rialto, Chino, Upland, Redlands, Diamond Bar, and more.

Is a call from area code 840 a scam?

Area code 840 is a legitimate general purpose code area code serving California. Like any area code, individual numbers using 840 can be used for scam calls — always verify the specific number if you receive an unexpected or suspicious call.