List of original NANP area codeswikipedia
This is the list of original North American Numbering Plan area codes of 86 plan areas as defined by AT&T in 1947.
original area codesoriginal 86 area codesoriginal numbering plan areasManhattan's traditional 21286 area codesoriginal area codeoriginal NPAsoriginal area codes created in 1947area codes86 three-digit routing codes

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.

Area codes 214, 469, and 972

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

North American Numbering Plan

Area codeArea codes<span style="white-space:nowrap;">Area 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 86 area codes were assigned.

Telephone exchange names

telephone exchange namescentral office nametelephone exchange
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.

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 code 216

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

Area code 202

202area code 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 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 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 codes 215, 267, and 445

215 and 267215area codes 215 and 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 code 404

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

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 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 240 and 301

301240 & 301240
The main area code, 301, was one of the original area codes established in 1947, and originally covered the entire state of Maryland.

Area codes 613 and 343

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

Area codes 512 and 737

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

Area code 206

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

Area code 618

618area code 618217
618 was among the original North American area codes created in 1947.

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 902 and 782

902782902 and 782
The 902 area code is one of the 86 original area codes established in the North American Numbering Plan in October 1947.

Area codes 617 and 857

617857617 and 857
The main area code, 617, was one of the original area codes from October 1947, and originally covered the eastern two-thirds of Massachusetts, from roughly the western end of Worcester County to Cape Cod and the South Coast.

Area code 504

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

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.