Area code 831

About area code 831

Area code 831 is a geographic area code in California, in service since July 11, 1998, according to the North American Numbering Plan Administrator (NANPA). It is not part of an overlay, so every number in its territory starts with 831. It is in the Pacific time zone. The places with the most assigned exchanges include Salinas, Santa Cruz, Monterey, Watsonville, and Hollister. By population, its largest named places are Salinas, Santa Cruz, Watsonville, Hollister, and Monterey.

Cities and towns in area code 831

831 holds 1.8% of the 22,087 central office codes assigned in California, the 28th most of the state's 41 codes. 9 Census places could be matched to rate centers with 831 exchanges; the most populous are Salinas (161,000), Santa Cruz (62,581), Watsonville (51,320), and Hollister (45,033). For a storefront or service area inside 831, the place pages show which prefixes are rated local there.

Ten-digit and seven-digit dialing in 831

According to NANPA's dialing-plan data, local calls within 831 are dialed as seven digits and toll calls as seven digits. Seven-digit local dialing is still permitted here, but customers calling from other area codes, and every mobile contact list, use all ten digits.

Carriers with 831 numbers

45 carriers hold the 406 central office codes assigned in 831. Pacific Bell has the most, with 124 (31%). 308 of the codes (76%) 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.

Rate centers and towns in 831

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 831 has codes in 24 rate centers. The table lists the rate centers with the most codes, with the matching Census place where the abbreviation could be matched.

Number supply in 831

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). 406 are assigned in 831, 51% of 800. 50 were assigned in 2020 or later.

A local 831 number on Callata

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 831, 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.