Area code 631

About area code 631

631 is one of 23 geographic area codes serving New York; NANPA records its in-service date as November 1, 1999. It is an overlay: 631 and 934 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern time zone. The places with the most assigned exchanges include Farmingdale, Riverhead, Huntington, Amityville, and Babylon. By population, its largest named places are Islip, Babylon, Huntington, Smithtown, and Southampton.

Where 631 numbers are local

631 holds 6.5% of the 12,049 central office codes assigned in New York, the 6th most of the state's 23 codes. 23 Census places could be matched to rate centers with 631 exchanges; the most populous are Islip (339,000), Babylon (219,000), Huntington (205,000), and Smithtown (116,000). For a storefront or service area inside 631, the place pages show which prefixes are rated local there.

Dialing 631 numbers

According to NANPA's dialing-plan data, local calls within 631 are dialed as ten digits (area code plus number) and toll calls as ten digits (area code plus number). Ten-digit local dialing means the area code is part of how customers save and recognize your number, so print it in full everywhere. NANPA's dialing-plan note for this code reads: "1+10 digit permissible at service provider discretion"

Who holds 631 exchanges

39 carriers hold the 782 central office codes assigned in 631. Verizon New York, INC. has the most, with 228 (29%). 600 of the codes (77%) 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 631

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 631 has codes in 54 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 631

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). 782 are assigned in 631, 98% of 800. 28 were assigned in 2020 or later.

Using area code 631 for business calls

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 631, 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.