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Area code 520 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Arizona. The numbering plan area comprises Tucson and most of the southeastern part of the state. Area code 520 was created in a split of area code 602 on March 19, 1995.
Each NPA is identified by one or more numbering plan area codes ( NPA codes, or area codes ), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes.
CodeTerritory Or UseDate200not in use; available for non-geographic ...easily recognizable code (ERC)New Jersey ( Bergen County and Hudson ...19471947Southwestern Connecticut ( Bridgeport, ...1947Area code 520 serves Southern Arizona, including Tucson and its metropolitan area, Casa Grande, Nogales, and Sierra Vista. Area code 928 includes the remainder of the state, including Yuma, Kingman, Flagstaff, Prescott, the Arizona portion of the Navajo Nation, and Safford.
- History
- Administration
- Numbering Plan
- Non-Geographic Services
- Cellular Mobile Services
- Growth
- Dialing Procedures
- International Dialing
- Number Portability
- Toll Charges
From the Bell System's beginnings in 1876 and throughout the first part of the 20th century, telephone networks grew from essentially local or regional telephone systems. These systems expanded by increasing their subscriber bases, as well as increasing their service areas by implementing additional local exchanges that were interconnected with tie...
The NANP is administered by the North American Numbering Plan Administrator (NANPA, formerly Administration).This function is overseen by the Federal Communications Commission, which assumed the responsibility upon the end of the Bell System. The FCC solicits private sector contracts for the role of the administrator. Before the division of the Bel...
The long-range vision of the architects of the North American Numbering Plan was a system by which telephone subscribers in the United States and Canada could themselves dial and establish a telephone call to any other subscriber without the assistance of switchboard operators. While the dialing of telephone calls by subscribers was common-place in...
The North American Numbering Plan recognizes the need for non-geographic services by designating certain numbering blocks for such purposes. Many of these telephone numbers are selected from the easily recognizable codes(ERCs). System-wide toll-free calling, for which the receiving party is billed for the call, uses the number range with area codes...
The North American Numbering Plan does not reserve special non-geographic area codes exclusively for cellular phones, as is customary in some other national telephone administrations. Only one regional exception exists in area code 600in Canada. For cellular services, telephone numbers in the NANP are allocated within each area code from special ce...
Canada and the United States have experienced rapid growth in the number of area codes, particularly between 1990 and 2005. The widespread adoption of fax, modem, and mobile phone communication, as well as the deregulation of local telecommunication services in the United States during the mid-1990s, increased the demand for telephone numbers. The ...
The structure of the North American Numbering Plan permits implementation of local dial plans in each plan area, depending on requirements. When multiple NPA codes serve an area in an overlay arrangement, ten-digit (10D) dialing is required. Seven-digit (7D) dialing may be permissible in areas with single area codes. Depending on the requirement of...
While direct dialing of international calls was available in some locations in the United States by the late 1950s, a continental system was introduced asInternational Direct Distance Dialing(IDDD) for the territories of the North American Numbering Plan in March 1970. IDDD was implemented through extensive modifications in the switching systems to...
The Telecommunications Act of 1996 (47 U.S.C. § 251 (b)(2)) authorizes the Federal Communications Commission (FCC) to require all local exchange carriers (LECs) to offer local number portability. The FCC regulations were enacted on June 27, 1996, with changes to take effect in the one hundred largest Metropolitan Statistical Areasby October 1, 1997...
Telephone calls between countries and territories of the NANP are not typically charged at domestic rates. For example, most long-distance plans may charge a California subscriber a higher rate for a call to British Columbia than for a call to New York, even though both destinations are within the NANP. Similarly, calls from Bermuda to U.S. destina...
May 1, 2024 · Learn about the 520 area code in Arizona, which covers 59 cities and 9 counties, including Phoenix, Tucson, and Chandler. Find out the time zone, population, prefix assignment, and overlay status of this area code.
Mar 19, 1995 · 520 Area Code. SE Arizona. May 23, 2024. U.S. STATE Capitals: Learn the state capitals | Take the State Capitals Quiz. 520 Prefixes/Exchanges. Prefix. Location. Company. Assigned. 520-200. HAYDEN, AZ. ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM. 10/24/02. 520-201. SAN MANUEL, AZ. ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM. 10/24/02. 520-202. TUCSON, AZ.
Find out the location, map, current time, and prefixes of the 520 area code in Arizona. The 520 area code covers Tucson, Casa Grande, Sierra Vista, Nogales, and other cities in the Mountain timezone.
