Area Code 840

840 is the Inland Empire's newest area code

840 is a new all-services overlay of 909 in California's Inland Empire, covering San Bernardino, Ontario, Pomona, Rancho Cucamonga and the surrounding area; it went into service on February 23, 2021. The California Public Utilities Commission authorized it as 909 ran short of numbers. The rollout changed dialing: the 909 region moved to mandatory 10-digit dialing — you must dial 1 plus the area code plus the number — in January 2021. Existing 909 numbers are unchanged; only new lines may receive an 840 number.

Because 840 is new and unfamiliar, some people are wary when it appears on caller ID and search for “who called me from 840?” An area code only shows where a number is registered, and any number can be spoofed — so a 840 call is not suspicious on its own. Judge each call by what it asks for, not the code. Is a call from 840 a scam?

FTC complaints involving 840 numbers

Numbers shown with area code 840 in the FTC's Do Not Call “Reported Calls” database (recent reporting window). Most common reported reasons: “Reducing your debt (credit cards, mortgage, student loans)”, “No Subject Provided”, “Calls pretending to be government, businesses, or family and friends”.

Most-complained 840 numbers:

• (840) 236-0432 — 3 complaints
• (840) 837-4199 — 3 complaints
• (840) 210-0977 — 3 complaints
• (840) 200-0847 — 3 complaints
• (840) 210-0967 — 3 complaints

These are FTC Do Not Call complaints filed about specific numbers shown with this area code — frequently spoofed. The area code itself is not a scam. See the most-reported area codes and the most-reported phone numbers nationwide.

Frequently asked questions

Where is area code 840?

Area code 840 covers Pomona and nearby cities including San Bernardino, Fontana, Rancho Cucamonga in California, in the Pacific Time.

What cities use area code 840?

Area code 840 serves Pomona, San Bernardino, Fontana, Rancho Cucamonga, Ontario, and 13 other communities in California.

What time zone is area code 840 in?

Area code 840 is in the Pacific Time (America/Los_Angeles).

How do you dial a 840 number?

Dial all 10 digits: 840 followed by the 7-digit local number. From abroad, dial +1 840 and the local number.

Is a call from area code 840 a scam?

A 840 number is geographically tied to California, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.

Is 840 a country code?

No. 840 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 840 number written for international dialing looks like +1 840 followed by the 7-digit local number.