Area code 520

Where area code 520 is

520 is one of 5 geographic area codes serving Arizona; NANPA records its in-service date as March 19, 1995. It is not part of an overlay, so every number in its territory starts with 520. It is in the Mountain time zone. The places with the most assigned exchanges include Tucson, Sierra Vista, Casa Grande, Nogales, and Willcox. By population, its largest named places are Tucson, Yuma, Flagstaff, Casa Grande, and Prescott.

Cities and towns in area code 520

520 holds 22% of the 3,170 central office codes assigned in Arizona, the 3rd most of the state's 5 codes. 15 Census places could be matched to rate centers with 520 exchanges; the most populous are Tucson (554,000), Yuma (104,000), Flagstaff (77,539), and Casa Grande (68,927). Each place page lists the exact prefixes and carriers for that town.

Dialing 520 numbers

According to NANPA's dialing-plan data, local calls within 520 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."

Phone companies in area code 520

51 carriers hold the 694 central office codes assigned in 520. Qwest Corporation has the most, with 200 (29%). 487 of the codes (70%) 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.

Local calling areas in 520

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 520 has codes in 37 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

Number supply in 520

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). 694 are assigned in 520, 87% of 800. 162 were assigned in 2020 or later.

A local 520 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.

Porting a number you already use in area code 520 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.