List of original NANP area codes

original area codesoriginal 86 area codesoriginal numbering plan areas86 allocated area codes86 original area codes86 three-digit routing codesarea codeseighty-six area codesinitial 86 area codesinitial area code
This is the list of original North American Numbering Plan area codes of 86 plan areas as defined by AT&T in 1947.wikipedia
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Area codes 204 and 431

204431204, 431
204 is one of the original 86 area codes assigned in 1947 in the contiguous United States and the then-nine-province extent of Canada.

Telephone exchange names

central office nametelephone exchangetelephone exchange name
This included a three-digit central office prefix, dialed as the first two letters of the local central office name and one digit, and the four-digit subscriber station number.
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.

North American Numbering Plan

Area codeArea codesArea code(s)
In preparation for direct distance dialing, AT&T and the Bell System developed the North American Numbering Plan in the 1940s.
Originally only eighty-six area codes were assigned.

Area codes 214, 469, and 972

972214469
The main area code, 214, was one of the original area codes established in October 1947.

Area code 202

202Area codes in Washington, D.C.
The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).

Area codes 212, 646, and 332

212212, 332, 646area code 212
Area code 212 is one of the original 86 area codes assigned by AT&T in 1947, and served the entire five boroughs of New York City.

Area codes 201 and 551

201area code 201551
Area code 201 was the first-assigned numbering plan area (NPA) code of the original NPAs when AT&T devised the North American Numbering Plan in 1947.

Area code 216

216area code
It was one of the original area codes issued in the North American Numbering Plan on January 1, 1947.

Area code 217

217XXX
217 was one of the original area codes, which were created in 1947.

Area codes 215, 267, and 445

215215 and 267215 & 267
Area code 215 was one of the original area codes established in 1947 and originally included the entire southeastern part of the Commonwealth, from the Delaware border to the Lehigh Valley.

Area codes 305 and 786

305305, 786786
Area code 305 was one of the original area codes created in 1947, and originally covered the entire state of Florida.

Area code 206

206area code
Area code 206 was one of the original area codes assigned in 1947, and originally covered the entire state of Washington.

Area codes 301 and 240

301240 & 301240
Area code 301 was one of the original area codes established in 1947 when the North American Numbering Plan (NANP) was created, and originally covered the entire state of Maryland.

Area code 404

404Atlanta calling area
Area code 404 was created in 1947 as one the original numbering plan areas in North America.

Area codes 303 and 720

303720303, 720
Area code 303 was one of the original area codes put into service in 1947, and originally covered the entire state of Colorado.

Area codes 416, 647, and 437

416416, 647416, 647, 437
The main area code, 416, was one of the 86 original area codes introduced in 1947.

Area codes 512 and 737

512512 & 737737
Area code 512 was one of the original area codes established in October 1947.

Area codes 601 and 769

601601 & 769769
The main area code, 601, was one of the original area codes implemented in 1947, and covered the entire state of Mississippi.

Area codes 503 and 971

503 and 971503971
Area code 503 was one of the original area codes created as part of the North American Numbering Plan by AT&T and Bell Laboratories in 1947.

Area codes 315 and 680

315315 & 680315/680
The main area code, 315, was one of the original area codes created in 1947, it has been split once.

Area codes 613 and 343

613613, 343343
613 is one of the 86 original area codes in the NANP assigned in October 1947.

Area code 207

207telephone area codeArea codes in Maine
Area code 207 was created as one of the original area codes in 1947.

Area code 504

504
504 was one of the original area codes created in 1947, and originally covered all of Louisiana.