269 lines
12 KiB
Plaintext
269 lines
12 KiB
Plaintext
From: cmoore@brl.mil
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Subject: history.of.area.splits
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Last updated: 18 March 1994 by Carl Moore
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Generalizing prefixes from NNX to NXX (i.e., allowing N0X/N1X)
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is an alternative to splitting an area which has had only NNX
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up to this point. When an area has NXX (not NNX) prefixes,
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its long distance dialing instructions usually are:
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7D or 1 + NPA + 7D within area (can no longer use 1 + 7D);
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1 + NPA + 7D to other areas (can no longer use NPA + 7D);
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for 0+ calls, try 0 + NPA + 7D (some 0 + 7D would require timeout).
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In other words, the leading 1 (or 0) means that what follows is
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an area code. These instructions can, without further revision,
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accommodate area codes of form NXX, not just of form N0X/N1X, and
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thus could be universal by the time area codes must generalize to
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NXX. The deadline for switches to be able to handle NXX area codes
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is 1 January 1995 (had been 1 July 1995).
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It was thought that the first batch of NNX area codes would be of NN0
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form, so that some areas could keep 1 + 7D for intra-NPA long distance
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by disallowing prefixes of NN0 form; I did not know if this would have
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been affected by use of 52x codes (x not 0) for Mexico. But on 22
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July 1993, it was announced that area 205, covering all of Alabama,
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would split in 1995 to form 334.
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It is unclear how generalizing area codes to NXX would affect the
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policy of not using N0X/N1X prefixes until NNX starts running short.
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I found an exception to the above dialing instructions in February
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1992 for 215-267 (Denver) and 215-484 (Adamstown) in Pennsylvania.
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These exchanges, served by Denver & Ephrata Telephone & Telegraph
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(also serving a part of the 717 area), were still using the old
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instructions (1 + 7D and 0 + 7D within area code), even though
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this necessitated timeout resolution for some calls. I learned
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(on 2 September 1993) that they would move to 717 (Denver going
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to 717-336 because of 717-267 being in use at Chambersburg). On
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25 September 1993, I noticed that (during permissive dialing) all
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long distance from there was to be dialed as 1+NPA+7D (with 0+NPA+7D
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for all 0+), with "1 717" apparently being dropped after the full
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cutover to 717.
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The suggestion (at least from Bellcore) has been seen that ideally,
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all calls should be makeable as 1+NPA+7D (this does not necessarily
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forbid shorter forms).
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These areas prepared for N0X/N1X prefixes before it became necessary
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to prepare for NNX area codes:
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213, California, July 1973
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(7D on all calls within it)
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(later 213/818, now 213/310/818)
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(but for some time, this area continued to publish 0+7D instruction
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for within-NPA 0+ calls)
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212, New York, some days after 24 Nov 1980
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(7D on all calls within it)
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(later 212/718, now 212/917/718)
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312, Illinois, Oct 1982--but got 1st N0X/N1X spring 1983?
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(7D on all calls within it)
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(now 312/708)
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201, New Jersey
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(7D on all calls within it; also applies to 609)
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(now 201/908)
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214, Texas, 1986 or 1987 (by July 1987)
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(1+NPA+7D on all toll calls; also applies to 817,
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at least in Fort Worth area)
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(now 214/903)
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301/202/703, Maryland/DC/Virginia, 1987, due to DC area growth
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(1+NPA+7D on all toll calls)
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(301 now 301/410)
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415, California, Feb 1989?
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(7D on all calls within it)
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(now 415/510)
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404, Georgia, Oct 1989?
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(1+NPA+7D on all toll calls; also applies to 912)
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(now 404/706)
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919, North Carolina, 2 Mar 1990
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(1+NPA+7D on all toll calls; also applies to 704)
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(now 919/910)
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416, Ontario, 3 Mar 1990
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(1+NPA+7D on all toll calls)
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(now 416/905)
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602, Arizona, 1 July 1990
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(1+NPA+7D on all toll calls)
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(to become 602/520)
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313, Michigan, 1990?
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(1+NPA+7D on all toll calls)
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(now 313/810)
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512, Texas, 9 Sept 1990
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(1+NPA+7D on all toll calls)
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(now 512/210)
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205, Alabama, Dec 1990
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(1+NPA+7D on all toll calls)
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(to become 205/334)
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215, Pennsylvania, 20 May 1991
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(7D on all calls within it; exception noted above for 2 prefixes
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later moving to 717, but the new instructions also applied to:
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717-354,355 New Holland
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717-656,661 Leola
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717-768 Intercourse)
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(now 215/610)
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206, Washington, 12 Jan 1992
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(1+NPA+7D on all toll calls)
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(to become 206/360)
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713, Texas, 8 Mar 1992 (permissive dialing 8 Dec 1991)
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(1+NPA+7D on all toll calls)
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(to become 713/281)
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714, California, 1992?
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(7D on all calls within it)
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(now 714/909)
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503, Oregon, 10 July 1993
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(1+NPA+7D on all toll calls)
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No note about N0X/N1X prefixes, but instructions are being changed
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to prepare for NNX area codes:
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305,407,813,904, Florida, 7 Mar 1992 (at least for 813)
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(1+NPA+7D on all toll calls)
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207, Maine; 603, New Hampshire (17 July 1993); 1993-1994
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(This was to include all New England areas except Connecticut,
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but this list now has separate entries for Massachusetts,
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Vermont, and Rhode Island.)
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(Earlier, for 413 going to 7D on all calls within area code: Feb-
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June 1993; full cutover 21 Sept 1993; 1+NPA+7D for local calls to
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another area code permissive 1 Mar to 8 Apr 1993.)
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(7D on all calls within area code; optional for New Hampshire,
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with per-line option to block 7D and require 1+NPA+7D for toll
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within area code)
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413,508,617, Massachusetts (order by public utility commission in
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Oct 1993; mandatory, in 413, 1 June 1994; eastern Massachusetts
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to follow later in 1994)
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(1+NPA+7D on all toll calls)
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802, Vermont, permissive 18 Feb 1994, mandatory 18 May 1994
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(1+NPA+7D on all toll calls)
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401, Rhode Island, announced Jan 1994 (but when to be implemented?)
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(1+NPA+7D on all toll calls)
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303,719, Colorado (27 Feb 1994); 612,507,218, Minnesota (late 1994);
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319,515,712, Iowa; 701, North Dakota; 605, South Dakota; 308,402,
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Nebraska; 505, New Mexico; 801, Utah; 307, Wyoming; 406, Montana;
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208, Idaho; 509, Washington (15 May 1994, full cutover 17 Sept 1994);
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1993-1994
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(U.S. West areas except Arizona, Oregon, 206 in Washington)
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(1+NPA+7D on all toll calls)
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219,317,812 Indiana, c. Aug 1993 (full cutover 1 Dec 1993)
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(1+NPA+7D on all toll calls)
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615, Tennessee, 1 July 1993(?) (full cutover 1 Sept 1993)
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(1+NPA+7D on all toll calls)
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901, Tennessee, Sept 1993?
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(1+NPA+7D on all toll calls)
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803, South Carolina, Sept 1993?
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(1+NPA+7D on all toll calls)
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209,408,619,707,805,916, California; Pacific Bell, by 11 Oct 1993
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(These are the California area codes not cited above, as of Feb
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1993, as preparing for N0X/N1X prefixes; but some of these, in
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whole or in part, already have the new instructions.)
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(GTE areas: 0+NPA+7D for 0+ within own area code permissive 11 Oct
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1993, fully cut over 10 Oct 1994; direct-dial not affected.)
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(7D on all calls within area code)
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412,717,814, Pennsylvania, for 717 1 Nov 1993 (full cutover 31 July 1994);
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announced Sept 1993
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(7D on all calls within area code)
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716, New York, 5 Dec 1993 (at least for Rochester Telephone); is this
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permissive or mandatory date?
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(7D on all calls within it)
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601, Mississippi, Dec 1993
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(1+NPA+7D on all toll calls)
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302, Delaware, 1 Apr 1994 (full cutover 7 Jan 1995)
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(1+NPA+7D on all toll calls, ordered by state PUC)
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519,613,705,807, Ontario; 418,514,819, Quebec; 204, Manitoba; 306,
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Saskatchewan; 403, Alberta (and Yukon and NW Territories); 506,
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New Brunswick; 604, British Columbia; 709, Newfoundland (and
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Labrador); 902, Nova Scotia and Prince Edward Island; 4 Sept 1994
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(all of Canada except 416 and 905 in Ontario)
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(1+NPA+7D on all toll calls)
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Areacode splits:
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If no date appears, the split may not have been announced publicly due
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to lack of direct-dial facility at the time, or may never have occurred.
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Early splits can only be guessed at with the following guidelines:
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If an areacode is of form N1X, it is in a state or province with more
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than 1 areacode. (The reverse, if it was ever true, is now obsolete.)
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If an areacode is in a state or province with only 1 areacode, it is
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of form N0X. (The reverse, if it was ever true, is now obsolete.)
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what?/209 California
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what?/707 California
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what?/805 California
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305/813 Florida
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what?/309 Illinois
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502/606 Kentucky
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504/318 Louisiana
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612/507 Minnesota
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402/308 Nebraska
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what?/607 New York
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704/919 North Carolina
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405/918 Oklahoma
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901/615 Tennessee
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what?/806 Texas
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206/509 Washington
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what?/608 Wisconsin
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416/519 Ontario, 1953
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404/912 Georgia, 1953 or 1954
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December 1991 Greater Atlanta call guide, in discussing 404/706
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split, said "It's been 38 years since Georgia added an Area Code."
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613/705 Ontario, 1957 (did 705 also take part of the then 416?)
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201/609 New Jersey, late 1950s
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415/408 California, 1960
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616/906 Michigan, sometime after Nov 1960
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what?/807 Ontario, 1962 (either an area which had no area code, or 705 split)
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305/904 Florida, July 1965
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703/804 Virginia, 24 June 1973 at 2:01 AM
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714/619 California, Nov 1982
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713/409 Texas, Mar 1983 (full cutover 90 days later)
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213/818 California, Jan 1984
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212/718 New York, 2 Sept 1984 (full cutover 31 Dec 1984)
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Brooklyn, Queens, Staten Island became 718;
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Manhattan & Bronx stayed in 212;
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Bronx switched from 212 to 718, 1 July 1992 (full cutover
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15 May 1993; but until then, calls from Bronx to Brooklyn/
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Queens/Staten Island must still be dialed 1+718+7D, and
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effective 25 Sept 1993 must be dialed 7D)
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303/719 Colorado, 5 Mar 1988
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305/407 Florida, 16 Apr 1988
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617/508 Massachusetts, 16 July 1988
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312/708 Illinois, Nov 1989 (full cutover 9 Feb 1990)
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202 District of Columbia & vicinity, 1 Oct 1990
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This behaved somewhat like a split despite no new area code.
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202 area code, previously useable for all but the outermost
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Maryland and Virginia suburbs, was restricted to DC proper.
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(Use 301 or 703, as the case may be, to reach the suburbs.)
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As a result, government offices (now including the Pentagon)
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using zipcodes starting with 200,202,203,204,205 and located
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in Md. or Va. can no longer be listed in area 202. Prefixes
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in the Pentagon, which is in Virginia, were previously in area
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202 (not 703), and in 1990 were moved to area 703. (Local
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calls across area code border changed from 7D to NPA+7D.)
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214/903 Texas, 4 Nov 1990 (full cutover 4 May 1991)
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201/908 New Jersey, 1 Jan 1991 (full cutover 8 June 1991)
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415/510 California, 2 Sept 1991 (full cutover 27 Jan 1992)
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301/410 Maryland, 1 Nov 1991 (full cutover 1 Nov 1992)
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213/310 California, 2 Nov 1991 (full cutover 16 May 1992; was
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to be 2 May 1992, but was postponed indefinitely because
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of riots just before then)
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(all GTE plus some PacBell went into 310)
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212/718/917 New York, 1 Jan 1992 (917, to be overlaid on
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212 & 718, is to be used for cellular & pagers)
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404/706 Georgia, 3 May 1992 (full cutover 3 Aug 1992)
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512/210 Texas, 1 Nov 1992 (full cutover 1 May 1993)
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714/909 California, 14 Nov 1992 (full cutover 14 Aug 1993)
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(Riverside and San Bernardino counties go into 909;
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Orange County remains in 714)
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416/905 Ontario, 4 Oct 1993 (full cutover 25 Mar 1994,
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postponed from 10 Jan 1994)
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919/910 North Carolina, 14 Nov 1993 (full cutover 13 Feb 1994)
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313/810 Michigan, 1 Dec 1993 (full cutover 10 Aug 1994)
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215/610 Pennsylvania, 8 Jan 1994 (full cutover 7 Jan 1995)
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205/334 Alabama, 15 Jan 1995 (the first NNX area code to be
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announced, on 22 July 1993)
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206/360 Washington, 15 Jan 1995 (full cutover 9 July 1995)
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602/520 Arizona, Mar 1995 (announced 29 Nov 1993)
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713/281 Texas, 1995 (nature of the split not yet decided)
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Area codes 706,903,905 had been used, at least in the U.S., for
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calling parts of Mexico. (These codes were later announced for
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Georgia, Texas, and Ontario respectively.) 706 and 905 were
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discontinued 1 Feb 1991 for calls to Mexico (which was and still
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is reachable in country code 52); I have no such date available
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for 903.
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