North American Numbering Planwikipedia
Area codeArea codes<span style="white-space:nowrap;">Area code(s) Area code(s)+1North AmericaNorth American Numbering Plan AdministrationNumbering PlanNumber FormatNANPA

List of country calling codes

Country CodeDialing codeTelephone code
For international call routing, the NANP has been assigned the international calling code 1 by the International Telecommunications Union (ITU).
For example, the international call prefix in all countries belonging to the North American Numbering Plan is 011, while it is 00 in most European, Asian and African countries.

Telephone numbering plan

Area codeCalling codearea codes
The North American Numbering Plan (NANP) is a telephone numbering plan that encompasses 25 distinct regions in twenty countries primarily in North America, including the Caribbean and the U.S. territories.
National telephone numbers are defined by national or regional numbering plans, such as the European Telephony Numbering Space, the North American Numbering Plan (NANP), or the UK number plan.

Direct distance dialing

direct distance dialingdirect dialdirect distance dial
Direct distance dialing (DDD) was subsequently introduced across the country and by the early 1960s most areas of the Bell System had been converted and it was commonplace in cities and most larger towns.
DDD was the term used when the North American Numbering Plan was implemented in the 1950s.

List of original NANP area codes

original area codesoriginal 86 area codesoriginal numbering plan areas
Originally only 86 area codes were assigned.
In preparation for direct distance dialing, AT&T and the Bell System developed the North American Numbering Plan in the 1940s.

Seven-digit dialing

seven-digit dialing7-digit dialing7-digit dialling
The intent was that subscribers should not have to dial an area code when making a local call or a call within their plan area, resulting in seven-digit dialing.
Seven-digit dialing is a telephone dialing procedure customary in the territories of the North American Numbering Plan, for dialing telephone numbers in the local calling area.

Area codes 201 and 551

201area code 201551
New Jersey received the first area code in the new system, area code 201.
Area codes 201 and 551 are telephone area codes in the North American Numbering Plan in the U.S. state of New Jersey.

Area codes 317 and 463

317317 and 463area code 317
For example, Indiana area code 317 was split to provide a larger number pool in the Indiana suburbs of Chicago (area code 219).
Area codes 317 and 463 are North American Numbering Plan area codes for central Indiana.

United States

AmericanU.S.USA
In the following decades, the system expanded to include all of the United States and its territories, Canada, Bermuda, and 17 nations of the Caribbean.

555 (telephone number)

555 (telephone number)555555 telephone number
In some works of fiction, phone numbers will begin with "KLondike 5" or KLamath 5, which translates to 555, an exchange that is reserved for information numbers in North America.
The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-XXXX, in each numbering plan area (NPA).

North American Numbering Plan expansion

until it was split in 1958
Using 0 or 1 as the first digit of an area code or seven-digit local number is invalid, as is a 9 as the middle digit of an area code; these are trunk prefixes or reserved for North American Numbering Plan expansion.
The expansion of the North American Numbering Plan (NANP) is an anticipated requirement to provide more telephone numbers to accommodate future needs beyond the pool of ten-digit telephone numbers in use since the inception of the NANP in 1947.

N11 code

N11N-1-1
An N11 code (N-one-one) is a three-digit telephone number used in abbreviated dialing in some telephone administrations of the North American Numbering Plan (NANP).

Area code 334

334area code 334
The first area codes without a 1 or 0 as the middle digit were area code 334 in Alabama and area code 360 in Washington, which both began service on January 15, 1995.
Area code 334 is an NANPA area code serving southeastern Alabama.

Area code 612

612area code 612Minneapolis, MN
In 1998 area code 612, which had covered the Minneapolis – Saint Paul Twin Cities, was split to create area code 651 for St. Paul and the eastern metropolitan area.
Area code 612 is part of the North American Numbering Plan (NANP) of the public switched telephone network for the city of Minneapolis, Minnesota and a few surrounding areas such as Fort Snelling, St. Anthony and Richfield.

Ten-digit dialing

ten-digit dialing10-digit dialingten-digit dialling
Area codes were only required in ten-digit dialing when placing foreign area calls to subscribers in another state or numbering plan area.
After the implementation of the North American Numbering Plan, placing a local call within the caller's area code involved only seven-digit dialing.

Number pooling

number pooling
As a result, number pooling was piloted in 2001 as a system for allocating local numbers to carriers in blocks of 1,000 rather than 10,000.
Number pooling is a method of reallocating telephony numbering space in the North American Numbering Plan, primarily in growth areas in the United States.

Area codes 702 and 725

702725702 and 725
Nevada was denied 777 ("lucky 7s", a reference to the state's legalized gambling) for this reason; it received 775 instead when most of Nevada split from 702, which continues to serve the Las Vegas metropolitan area.
Area code 702 are the North American Numbering Plan telephone area codes serving Clark County, Nevada, including Las Vegas.

Telephone exchange names

telephone exchange namescentral office nametelephone exchange
This was already common practice, because the system of using the initial letters of central office names did not assign letters to digits 1 and 0.
In the 1940s, the Bell System developed the North American Numbering Plan, a system of initially 86 allocated area codes which were used at first only by switchboard operators to route trunk calls between plan areas.

Area code 246

+1 246246+1246
The area code 246 in the North American Numbering Plan (NANP) is a composite part of the telephone numbering plan for Barbados.

Area codes 905, 289, and 365

905 and 289905289
Area codes 905, 289, and 365 are area codes in the North American Numbering Plan (NANP) in Southern Ontario, Canada, particularly covering the Niagara Peninsula, the city of Hamilton, Halton Region, Peel Region, York Region, Durham Region, and parts of Northumberland County.

Area code 721

+1 721area code 721721
Dutch-speaking Sint Maarten joined the NANP in September 2011, receiving area code 721.
Area code 721 is the telephone area code of Sint Maarten within the North American Numbering Plan.

Area code 700

area code 700700AT&T EasyReach 700
Codes ending in double digits are reserved as easily recognizable codes (ERCs), to be used for special purposes such as toll-free numbers, personal 500 numbers, Canadian non-geographic area code 600, carrier-specific 700 numbers, and high-toll 900 numbers, rather than for geographic areas.
Area code 700 of the North American Numbering Plan is reserved for carrier-specific number assignments to special services or destinations.

Area code 360

360area code 360360/564
The first area codes without a 1 or 0 as the middle digit were area code 334 in Alabama and area code 360 in Washington, which both began service on January 15, 1995.
Area codes 360 and 334 (Alabama), which began service on the same day, were the first two area codes in the North American Numbering Plan with a middle digit other than 0 or 1.

Area codes in the Caribbean

Caribbean codesformerly covered 19 Caribbean territoriesmultiple new area codes
Many Caribbean codes were assigned based on alphabetic abbreviations of the territory name, as indicated in the third column of the following table (Letter code).
From 1958 to about 1995, most of the British West Indies in the Caribbean Basin, Bermuda, the U.S. Virgin Islands, the Dominican Republic and Puerto Rico shared a single area code 809 in the North American Numbering Plan.

Central office code protection

exchange code protectioncentral office code protectioncode protection
Allowing 7D local dial across an area code boundary, which is uncommon today, requires central office code protection, locally if using toll alerting, across the entire area code otherwise, to avoid assignment of the same seven-digit number on both sides.
In the administration of the North American Numbering Plan, central office code protection was a numbering policy intended to ensure that the same local telephone number was not assigned in both of a pair of adjacent communities on opposite sides of an area code boundary.

Canadian Numbering Administration Consortium

CNAC
Canadian numbering decisions are made by the Canadian Numbering Administration Consortium.
The CNAC is also responsible for paying the Canadian portion of the North American Numbering Plan Administration (NANPA) costs, which are funded by Canadian telecommunication service providers (TSP).