Area code 623

Area code 623 at a glance

Area code 623 is a geographic area code in Arizona, in service since March 1, 1999, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 623 and 480 and 602 cover the same territory, so neighbors on the same street can have different area codes. It is in the Mountain time zone. The places with the most assigned exchanges include Phoenix.

Cities and towns in area code 623

623 holds 9.8% of the 3,170 central office codes assigned in Arizona, the 5th most of the state's 5 codes. 1 Census place could be matched to rate centers with 623 exchanges; the most populous is Phoenix (1.7 million). Each place page lists the exact prefixes and carriers for that town.

How calls are dialed in 623

According to NANPA's dialing-plan data, local calls within 623 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "1+10 digit permissible at service provider discretion."

Carriers with 623 numbers

28 carriers hold the 312 central office codes assigned in 623. Qwest Corporation has the most, with 97 (31%). 224 of the codes (72%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Where 623 numbers are rated

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 623 has codes in 1 rate center. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

How full is area code 623?

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). 312 are assigned in 623, 39% of 800. 55 were assigned in 2020 or later.

Getting a 623 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.

Porting a number you already use in area code 623 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.