Area code 840

About area code 840

Area code 840 is a geographic area code in California, in service since February 23, 2021, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 840 and 909 cover the same territory, so neighbors on the same street can have different area codes. It is in the Pacific time zone. The places with the most assigned exchanges include Pomona, Fontana, Chino, Claremont, and Ontario. By population, its largest named places are Fontana, Ontario, Pomona, Rialto, and Chino.

Cities and towns in area code 840

840 holds 0.57% of the 22,087 central office codes assigned in California, the 34th most of the state's 41 codes. 12 Census places could be matched to rate centers with 840 exchanges; the most populous are Fontana (218,000), Ontario (185,000), Pomona (148,000), and Rialto (105,000). For a storefront or service area inside 840, the place pages show which prefixes are rated local there.

Ten-digit and seven-digit dialing in 840

According to NANPA's dialing-plan data, local calls within 840 are dialed as 1 plus ten digits and toll calls as 1 plus ten digits. Ten-digit local dialing means the area code is part of how customers save and recognize your number, so print it in full everywhere.

Carriers with 840 numbers

14 carriers hold the 126 central office codes assigned in 840. T-mobile USA, INC. has the most, with 32 (25%). 126 of the codes (100%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. Numbers can move between carriers through porting, so a code's holder tells you where the block started, not where every number lives now.

Local calling areas in 840

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 840 has codes in 19 rate centers. The table lists the rate centers with the most codes, with the matching Census place where the abbreviation could be matched.

How full is area code 840?

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 126 are assigned in 840, 16% of 800. 126 were assigned in 2020 or later.

Getting a 840 number for your business

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

If you already have a number in area code 840, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.