Telecom/1996-04-telecom-walnutcreek.iso/areacodes/history.area.splits.11-95

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Last updated: 1 Nov 1995 by Carl Moore <[e-mail]>
Thanks to various readers of TELECOM digest for their help,
especially to:
Mark J. Cuccia for sending me various notes and charts to fill out
gaps in the early history of area codes.
Steve Grandi for maintaining notes on new area codes in 1995.

North American telephone numbers in country code 1 are of the
form +1 AAA BBB BBBB, where
AAA is the area code
BBB BBBB is the local telephone number (first three digits are
the prefix)

The following area codes were used in the United States (just the 48
states and DC) and Canada, according to a map in "Nationwide Numbering
Plan" article by W. H. Nunn (Bell System Technical Journal, Sept. 1952).
Off the map are Alaska (now using 907), Hawaii (now using 808), and Puerto
Rico and the Virgin Islands (now part of 809); Alaska and Hawaii were not
states. Page 856 of the same reference notes that area codes of form N1X
were in states or provinces with more than one area code each, and area
codes of form N0X were in states or provinces with only one area code each.
The area codes are listed by state and province; since 1947 is the earliest
year for area codes, a special note is made of area codes not existing then.
Alabama: 205
Arizona: 602
Arkansas: 501
California: 213,415,714,916 (714 did not exist in 1947)
Colorado: 303
Connecticut: 203
Delaware: 302
District of Columbia: 202
Florida: 305
Georgia: 404
Idaho: 208
Illinois: 217,312,618,815
Indiana: 219,317,812 (219 did not exist in 1947)
Iowa: 319,515,712
Kansas: 316,913
Kentucky: 502
Louisiana: 504
Maine: 207
Maryland: 301
Massachusetts: 413,617
Michigan: 313,517,616
Minnesota: 218,612
Mississippi: 601
Missouri: 314,417,816 (417 did not exist in 1947)
Montana: 406
Nebraska: 402
Nevada: 702
New Hampshire: 603
New Jersey: 201
New Mexico: 505
New York: 212,315,516,518,716,914 (516 did not exist in 1947)
North Carolina: 704
North Dakota: 701
Ohio: 216,419,513,614
Oklahoma: 405
Oregon: 503
Pennsylvania: 215,412,717,814
Rhode Island: 401
South Carolina: 803
South Dakota: 605
Tennessee: 901
Texas: 214,512,713,915
Utah: 801
Vermont: 802
Virginia: 703
Washington state: 206
West Virginia: 304
Wisconsin: 414,715
Wyoming: 307
Same source has these area codes for Canada
    (Newfoundland joined this federation late):
Alberta: 403
British Columbia: 604
Manitoba: 204
New Brunswick, Nova Scotia, Prince Edward Island,
    Newfoundland/Labrador: 902 (only New Brunswick is on map)
Ontario: 416,613
Quebec: 418,514
Saskatchewan: 306
Yukon and Northwest Territories are off the map.

In tabular form (separate tables for N0X and N1X), the original
area codes are arranged like this:

N0X Form (States/Provinces with only ONE code assigned)
(40 codes assigned)
201 NJ    301 MD    401 RI    501 AR    601 MS    701 ND    801 UT    901 TN
202 DC    302 DE    402 NE    502 KY    602 AZ    702 NV    802 VT    902 mrtm.prv.
203 CT    303 CO    403 AB    503 OR    603 NH    703 VA    803 SC
204 MB    304 WV    404 GA    504 LA    604 BC    704 NC
205 AL    305 FL    405 OK    505 NM    605 SD
206 WA    306 SK    406 MT
207 ME    307 WY
208 ID

N1X Form (States/Provinces with several codes assigned)
(46 codes assigned)
212 NY    312 IL    412 PA    512 TX    612 MN    712 IA    812 IN
213 CA    313 MI    413 MA    513 OH    613 ON    713 TX        913 KS
214 TX    314 MO    414 WI    514 PQ    614 OH        814 PA    914 NY
215 PA    315 NY    415 CA    515 IA        715 WI    815 IL    915 TX
216 OH    316 KS    416 ON            616 MI    716 NY    816 MO    916 CA
217 IL    317 IN        517 MI    617 MA    717 PA
218 MN        418 PQ    518 NY    618 IL
    319 IA    419 OH

Until 1973, area codes were only of N0X/N1X form and prefixes
were only of NNX form. Both later generalized to NXX form. In
July 1973, area code 213, the first to do so, began allowing
N0X/N1X prefixes. Then area codes began running short, so NNX
area codes began to appear in January 1995 (specific codes began
to be announced in July 1993).

The above-mentioned generalizing of prefixes was an alternative
to splitting an area immediately, and as a result, long distance
dialing instructions for the affected area usually became:

  7D (if not already in use), or 1 + NPA + 7D, within area
   (no longer 1 + 7D);
  1 + NPA + 7D (if not already in use) to other areas
   (no longer NPA + 7D);
  for 0+ calls, try 0 + NPA + 7D (no longer 0 + 7D within
   area).
  Otherwise, some calls would require timeout to complete.

Except for 0 timing out and calling the local operator, I know of
only two cases where published instructions led to some timeout
situations. They were: the continued publishing of 0+7D within
area 213 in California; and the non-removal of 1+7D and 0+7D at
Denver and Adamstown (Pa.) when those places were in area 215.
(These cases are noted elsewhere in this file.)

The new dialing instructions (for areas having N0X/N1X prefixes)
are set up so that the leading 1 (or 0) means that what follows
is an area code. These same instructions accommodate the NXX area
codes, and thus became universal by the deadline (1 Jan 1995) for
switches to be able to handle NXX area codes. Such deadline was
previously 1 July 1995.

It was thought that the first batch of NNX area codes would be of NN0
form, so that some areas could keep 1 + 7D for intra-NPA long distance
by disallowing prefixes of NN0 form. This would have been affected by
use of area codes 52x (x not 0) for Mexico, and was affected anyway by
the first announcement of an NNX area code on 22 July 1993 (334, to be
formed in 1995 by splitting 205, which had served all of Alabama).

It is unclear how generalizing area codes to NXX would affect the
policy of not using N0X/N1X prefixes until NNX starts running short.

I found an exception to the above dialing instructions in February
1992 for 215-267 (Denver) and 215-484 (Adamstown) in Pennsylvania.
These exchanges, served by Denver & Ephrata Telephone & Telegraph
(also serving Ephrata in 717 area), were still using the old
instructions (1 + 7D and 0 + 7D within area code), even though
this necessitated timeout resolution for some calls. Elsewhere
in this file, it is noted that these prefixes later moved to 717,
with Denver having to use 717-336.

The suggestion (at least from Bellcore) has been seen that ideally,
all calls should be makeable as 1+NPA+7D (this does not necessarily
forbid shorter forms).

These areas prepared for N0X/N1X prefixes before it became necessary
to prepare for NNX area codes:
213 California, July 1973
  (7D on all calls within it)
  (now 213/310/818, to become 213/310/818/562)
  (but for some time, this area continued to publish 0+7D instruction
   for within-NPA 0+ calls)
212 New York, some days after 24 Nov 1980
  (7D on all calls within it)
  (now 212/917/718)
312 Illinois, Oct 1982--but got 1st N0X/N1X spring 1983?
  (7D on all calls within it)
  (now 312/708/630, to become 312/773/708/630/847)
201 New Jersey
  (7D on all calls within it; also applies to 609)
  (now 201/908)
214 Texas, 1986 or 1987 (by July 1987)
  (1+NPA+7D on all toll calls; also applies to 817,
   at least in Fort Worth area)
  (now 214/903, to become 214/972/903)
301/202/703 Maryland/DC/Virginia, 1987, due to DC area growth
  (1+NPA+7D on all toll calls)
  (301 now 301/410)
  (703 now 703/540)
415 California, Feb 1989?
  (7D on all calls within it)
  (now 415/510)
404 Georgia, Oct 1989?
  (1+NPA+7D on all toll calls; also applies to 912)
  (now 404/706, to become 404/770/706)
919 North Carolina, 2 Mar 1990
  (1+NPA+7D on all toll calls; also applies to 704)
  (now 919/910)
416 Ontario, 3 Mar 1990
  (1+NPA+7D on all toll calls)
  (now 416/905)
602 Arizona, 1 July 1990
  (1+NPA+7D on all toll calls)
  (now 602/520)
313 Michigan, 1990?
  (1+NPA+7D on all toll calls)
  (now 313/810)
512 Texas, 9 Sept 1990
  (1+NPA+7D on all toll calls)
  (now 512/210)
205 Alabama, Dec 1990
  (1+NPA+7D on all toll calls)
  (now 205/334)
215 Pennsylvania, 20 May 1991
  (7D on all calls within it; exception noted above for Denver and
   Adamstown, which later moved to 717, but the new instructions also
   applied to:
   717-354,355 New Holland
   717-656,661 Leola
   717-768 Intercourse)
  On 25 September 1993, I noticed that, during permissive dialing
  during the 215-to-717 change for Denver and Adamstown, all long
  distance from there was to be dialed as 1+NPA+7D, with 0+NPA+7D
  for all 0+. After full cutover to 717, "1 717" was dropped, and
  by then the local calls between Reading (moved from 215 to 610)
  and Adamstown were 1+NPA+7D.
  (now 215/610)
206 Washington state, 12 Jan 1992
  (1+NPA+7D on all toll calls)
  (now 206/360)
713 Texas, 8 Mar 1992 (permissive dialing 8 Dec 1991)
  (1+NPA+7D on all toll calls)
  (now 713/281)
714 California, 1992?
  (7D on all calls within it)
  (now 714/909)
503 Oregon, 10 July 1993
  (1+NPA+7D on all toll calls)
  (to become 503/541)

No note about N0X/N1X prefixes (due to closeness to the time
for area codes to generalize to NXX), but instructions changed
to accommodate the generalized area codes:
305,407,813,904 Florida, 7 Mar 1992 (at least for 813)
  (1+NPA+7D on all toll calls)
603 New Hampshire, 17 July 1993
  (This was to include all New England areas except Connecticut,
   with changeover to 7D on calls within area code to be done in
   1993-1994, but this list now has separate entries for Massa-
   chusetts, Vermont, Rhode Island, and Maine.)
  (7D on all calls within area code; per-line option [for toll
   within area code] to block 7D and require 1+NPA+7D, but 1994
   Portsmouth directory merely said 7D or 1+NPA+7D for this)
413,508,617 Massachusetts (order by public utility commission in
   Oct 1993; in 413, mandatory 1 June 1994; eastern Massachusetts
   followed later in 1994; in 508, permissive 15 July 1994; in 508
   and 617, mandatory 15 Oct 1994)
  (Earlier, for 413 going to 7D on all calls within area code: Feb-
   June 1993; full cutover 21 Sept 1993; 1+NPA+7D for local calls to
   another area code permissive 1 Mar to 8 Apr 1993.)
  (1+NPA+7D on all toll calls)
802 Vermont, permissive 18 Feb 1994, mandatory 18 May 1994
  (1+NPA+7D on all toll calls)
401 Rhode Island, announced Jan 1994 (but when to be implemented?)
  (1+NPA+7D on all toll calls)
207 Maine, 15 July 1994
  (1+NPA+7D on all toll calls)
303,719 Colorado (27 Feb 1994); 612,507,218 Minnesota (late 1994);
  319,515,712 Iowa; 701 North Dakota (19 June 1994, full cutover
  3 Oct 1994; 605 South Dakota; 308,402 Nebraska (full cutover
  late 1994 for Lincoln Telephone area); 505 New Mexico (14 Feb
  1994, full cutover 19 Jun 1994); 801 Utah; 307 Wyoming; 406
  Montana; 208 Idaho; 509 Washington (15 May 1994, full cutover
  17 Sept 1994); 1993-1994 (U.S. West areas except Arizona,
  Oregon, 206 in Washington state)
  (1+NPA+7D on all toll calls)
  (303 now 303/970)
219,317,812 Indiana, c. Aug 1993 (full cutover 1 Dec 1993)
  (1+NPA+7D on all toll calls)
615 Tennessee, 1 July 1993(?) (full cutover 1 Sept 1993)
  (1+NPA+7D on all toll calls)
  (to become 615/423)
901 Tennessee, Sept 1993?
  (1+NPA+7D on all toll calls)
803 South Carolina, Sept 1993?
  (1+NPA+7D on all toll calls)
  (to become 803/864)
502,606 Kentucky, 4 Sept 1993 (full cutover 2 Apr 1994)
  (1+NPA+7D on all toll calls)
318,504 Louisiana, 4 Sept 1993 (full cutover 2 Apr 1994)
  (1+NPA+7D on all toll calls)
209,408,619,707,805,916 California; Pacific Bell, by 11 Oct 1993
  (full cutover for all points on or before 11 Oct 1994)
  These are the California area codes not cited above, as of Feb
  1993, as preparing for N0X/N1X prefixes; but some of these, in
  whole or in part, already had the new instructions.
  GTE areas: 0+NPA+7D for 0+ within own area code permissive 11 Oct
  1993, fully cut over 10 Oct 1994; direct-dial not affected.
  (7D on all calls within area code)
412,717,814 Pennsylvania, for 717 1 Nov 1993 (full cutover 31 July 1994),
  for 814 8 Nov 1993 (full cutover 1 Aug 1994); announced Sept 1993
  (7D on all calls within area code)
  I found 1+NPA+7D on all toll calls in use in some places not served
  by Bell. These include pay phones on: 814-634 Meyersdale, 4 July 1994;
  717-533 Hershey, 19 Nov 1994.
716 New York, 5 Dec 1993 (at least for Rochester Telephone;
  is this permissive or mandatory date?)
  (7D on all calls within it)
  (but on 1 June 1994, NYNEX announced 1+NPA+7D on all toll calls,
   for its portion, including Buffalo, of 716 area)
601 Mississippi, Dec 1993
  (1+NPA+7D on all toll calls)
302 Delaware, 1 Apr 1994 (full cutover 7 Jan 1995)
  (1+NPA+7D on all toll calls)
304 West Virginia, full cutover 1 Jan 1995
  (earlier, saw 16 or 30 Apr 1994 for 1+NPA+7D for local to other area
   codes; and 30 Apr 1994, with full cutover 1 Oct 1994, for 7D on all
   calls within area code)
  (1+NPA+7D on all toll calls)
517,616,906 Michigan, 1994 (1 May in 517 & 616; 1 Feb 1994 in 906)
  (1+NPA+7D on all toll calls)
808 Hawaii, 19 June 1994
  (1+NPA+7D on all toll calls)
314,417,816 Missouri, July 1994
  (1+NPA+7D on all toll calls)
316,913 Kansas, July 1994
  (1+NPA+7D on all toll calls)
405,918 Oklahoma, July 1994 (mandatory 1 Jan 1995)
  (1+NPA+7D on all toll calls)
501 Arkansas, July 1994
  (1+NPA+7D on all toll calls)
409,806,915 Texas, July 1994
  (also applies by then to 817 outside of Fort Worth area?)
  (1+NPA+7D on all toll calls)
702 Nevada, July 1994
  (1+NPA+7D on all toll calls)
519,613,705,807 Ontario; 418,514,819 Quebec; 204 Manitoba; 306
  Saskatchewan; 403 Alberta (and Yukon and NW Territories); 506
  New Brunswick; 604 British Columbia; 709 Newfoundland (and
  Labrador); 902 Nova Scotia and Prince Edward Island; 4 Sept 1994
  (all of Canada except 416 and 905 in Ontario)
  (1+NPA+7D on all toll calls)
315,516,518,607,914 New York, 1994? (mandatory 24 Sept 1994,
  at least in 516 & 914)
  (7D on all calls within area code)
  (note that "PSC may ask telcos to provide option for mandatory 1+NPA+7D
   on all toll calls at subscriber's request" for 315,518,607)
217,309,618,815 Illinois, 1994?
  (7D on all calls within area code)
216,419,513,614 Ohio, 1994? (full cutover 1 Jan 1995)
  (but in late Dec. 1994, I saw a notice for 216, at least for a part of
   it along Ohio Turnpike: permissive 1 Jan 1994, mandatory 1 Oct 1994)
  (1+NPA+7D on all toll calls)
414,608,715 Wisconsin, 1994?
  (1+NPA+7D on all toll calls)
817 Texas, 1994? (already in use in & near Fort Worth)
  (1+NPA+7D on all toll calls)
203 Connecticut, 1994? (seen in Southern New England Telephone
  directories which were not to be used before 25 Apr 1994;
  what about the NYNEX part in the southwestern corner?)
  (1+NPA+7D on all toll calls)
804, Virginia, 16 May 1994 (full cutover 16 Nov 1994)
  (1+NPA+7D on all toll calls)
907 Alaska, 1994? (full cutover 1 Jan 1995)
  (1+NPA+7D on all toll calls)
809, Caribbean area (full cutover 9 Jan 1995)
  (1+NPA+7D on all toll calls; one exception: St. Vincent, Turks & Caicos
   to use 01+NPA+7D on all toll calls)

Areacode splits and realignments:
Early ones might not have been announced publicly due to lack of direct-dial
facility at the time.
 Early splits could be guessed at with the following
guidelines (reference is page 856 of the Sept. 1952 Bell System Technical
Journal, in the article "Nationwide Numbering Plan" by W. H. Nunn):
    If an areacode is of form N1X, it is in a state or province with more
    than 1 areacode. (The reverse is now obsolete.)
    If an areacode is in a state or province with only 1 areacode, it is
    of form N0X. (The reverse is now obsolete.)
List of splits and realignments:
317/219 Indiana, 1948?
(realignment of 213/415/916 California, 1950?  The earliest area code
    maps have only those three area codes in California, and appearing
    in that order from south to north, with both boundaries running
    from the Pacific Ocean to the Nevada state line. In the realignment,
    a triangular wedge along the Nevada state line shifted from 415 to
    213; and afterwards, to the north of 213, 415 touched the Pacific
    Ocean and 916 touched the Nevada state line, going all the way north
    to the Oregon state line.)
816/417 Missouri, 1950
914/516 New York, 1951
213/714 California, 1951
415/318 California, 1951
    318 was used for San Francisco only, during the Englewood (N.J.)
    Customer DDD Trials; Oakland remained in 415. Sometime before 1957,
    318 was reclaimed for future use, and San Francisco returned to 415.
416/519 Ontario, 1953 (519 also took part of 613)
305/813 Florida, 1953
    This and the 405/918 split were the first splits of N0X area codes.
405/918 Oklahoma, 1953
915/817 Texas, 1953 (817 also took part of 214)
218/612/507 Minnesota, 1954
    Before this split: 218 was shown as extending down the entire
    western boundary of Minnesota (along the North & South Dakota
    borders) to the Iowa border; 612 was also shown extending down
    to Iowa; 507 did not exist. Apparently, 507 took parts of 218
    and 612, and 612 took part of 218. (Starting 1954, new N0X codes
    began to be assigned in splits of both N0X and N1X area codes.)
315/607 New York, 1954 (607 also took part of 716 at this time or later?)
901/615 Tennessee, 1954
404/912 Georgia, 1954
    December 1991 Greater Atlanta call guide, in discussing 404/706
    split, said "It's been 38 years since Georgia added an Area Code."
704/919 North Carolina, 1954
402/308 Nebraska, 1954
502/606 Kentucky, 1954
902/506 Canadian maritime provinces, 1955
    New Brunswick and Newfoundland/Labrador switched to 506; Nova Scotia
    and Prince Edward Island stayed in 902.
414/715/608 Wisconsin, 1955 (new area code 608 took parts of 414 and 715)
504/318 Louisiana, 1957
    318, used earlier for San Francisco, had been reclaimed by this time.
206/509 Washington state, 1957
    1957 marked the beginning of the use of N09 area codes.
613/705 Ontario, 1957 (705 also took part of 519)
213/805 California, 1957 (805 also took parts of 415 and 916)
514/819 Quebec, 1957 (819 also took part of 418)
217/815/309 Illinois, 1957 (new area code 309 took parts of 217 and 815)
915/806 Texas, 1957 (806 also took part of 817)
(808 in Hawaii and 907 in Alaska were implemented in 1957.)
201/609 New Jersey, 1958 (New York Times, page B4, 27 April 1989)
916/209 California, 1958
(809 in the Caribbean area was implemented in 1958.)
415/408/707 California, 1959 (new area codes 408 and 707 formed from 415)
(In or about 1960, several area code boundaries were realigned. At this or
     some other time, area code 914 in New York expanded by taking southern
     part of 518.)
616/906 Michigan, 1961
506/709 New Brunswick and Newfoundland/Labrador, 1962
    Newfoundland/Labrador switched to 709; New Brunswick stayed in 506.
705/807 Ontario, 1962
305/904 Florida, July 1965
703/804 Virginia, 24 June 1973 at 2:01 AM
(In or after 1975, did a few prefixes, including 394 Canandaigua,
    move from 315 to 716 in New York? Another one might have been
    657 Holcomb.)
714/619 California, Nov 1982
713/409 Texas, Mar 1983 (full cutover 90 days later)
213/818 California, Jan 1984
212/718 New York, 2 Sept 1984 (full cutover 31 Dec 1984)
    Brooklyn, Queens, Staten Island became 718;
    Manhattan & Bronx stayed in 212;
    Bronx switched from 212 to 718, 1 July 1992 (full cutover
    15 May 1993; but until then, calls from Bronx to Brooklyn/
    Queens/Staten Island still had to be dialed 1+718+7D, and
    effective 25 Sept 1993 had to be dialed 7D)
303/719 Colorado, 5 Mar 1988
305/407 Florida, 16 Apr 1988
617/508 Massachusetts, 16 July 1988
312/708 Illinois, Nov 1989 (full cutover 9 Feb 1990)
202 District of Columbia & vicinity, 1 Oct 1990
    This was like a split despite no new area code. 202 area
    code, previously useable for all but the outermost Maryland
    and Virginia suburbs, was restricted to DC proper, with 301
    or 703, as the case may be, necessary for suburbs. As a
    result, government offices (by then including the Pentagon)
    using zipcodes starting with 200,202,203,204,205 and located
    in Md. or Va. could no longer be listed in area 202. Prefixes
    in the Pentagon, which is in Virginia, were previously in area
    202 (not 703), and moved to area 703 in 1990 because of local
    calls across area code border changing from 7D to NPA+7D; 202-
    694 had to be replaced by 703-614 because 703-694 was in use
    at Stuart.
214/903 Texas, 4 Nov 1990 (full cutover 4 May 1991)
201/908 New Jersey, 1 Jan 1991 (full cutover 8 June 1991)
415/510 California, 2 Sept 1991 (full cutover 27 Jan 1992)
301/410 Maryland, 1 Nov 1991 (full cutover 1 Nov 1992)
213/310 California, 2 Nov 1991 (full cutover 16 May 1992; was
     to be 2 May 1992, but was postponed indefinitely because
     of riots just before then)
     All GTE plus some PacBell went into 310.
212/718/917 New York, 1 Jan 1992 (cellular/pager overlay on 212 and 718)
404/706 Georgia, 3 May 1992 (full cutover 3 Aug 1992)
512/210 Texas, 1 Nov 1992 (full cutover 1 May 1993)
714/909 California, 14 Nov 1992 (full cutover 14 Aug 1993)
    Riverside and San Bernardino counties went into 909;
    Orange County remained in 714.
416/905 Ontario, 4 Oct 1993 (full cutover 25 Mar 1994,
    postponed from 10 Jan 1994)
919/910 North Carolina, 14 Nov 1993 (full cutover 13 Feb 1994)
313/810 Michigan, 1 Dec 1993 (full cutover 10 Aug 1994)
215/610 Pennsylvania, 8 Jan 1994 (full cutover 7 Jan 1995)
    Because of this split, Denver 267, Adamstown 484, and Terre Hill
    445 moved to 717 rather than 610, since their telephone companies
    serve adjacent areas already in 717; Denver went to 717-336 because
    of 717-267 being used at Chambersburg. I learned of this change for
    Denver and Adamstown on 2 September 1993; their dialing instructions
    are discussed elsewhere in this file. I did not learn of the Terre
    Hill area code change until 21 September 1994; that change was messy
    because Terre Hill had to go from 7D long distance within old area
    215 to 7D long distance within area 717.
312/708/630 Illinois, 7 Jan 1995 (was cellular/pager overlay on 312 and 708)
    This was in dispute, and it eventually became 708/630/847 (geographic).
    Change was formalized 21 March 1995:
    1. 312 in Chicago would no longer be involved in this split (see later
       note regarding area code 773). Instead, two new geographic area codes
       would be carved from 708, which would keep only its current southern
       part. Wireless numbers already in 630 would not be required to move.
    2. northern part of 708 would get a new area code, later announced
       as 847 (20 Jan 1996, full cutover 20 Apr 1996).
    3. 630 would become geographic and get western part of 708; this would
       not happen until 3 Aug 1996.
    This split of 708 would change the area code of some people who went
    into permissive mode for 708 only in November 1989.
205/334 Alabama, 15 Jan 1995 (full cutover 13 May 1995)
    The first NNX area code to be announced, on 22 July 1993.
206/360 Washington state, 15 Jan 1995 (full cutover 20 Aug 1995; originally
    9 July 1995, then changed to 21 May 1995, but then extended 90 days
    by the Washington Utilities and Transportation Commission on 26 Apr
    1995, because of problems in reaching 360, which is of NNX form)
713/281 Texas, 1 Mar 1995 (cellular/pager overlay, but to get new
    landlines starting 1 Mar 1996)
602/520 Arizona, 19 Mar 1995 (full cutover 21 Oct 1995 except in
    Tucson, Yuma, Flagstaff, Prescott)
    Announced 29 Nov 1993. Full cutover was set for 23 July 1995, then
    on 19 June it was postponed 90 days to 21 Oct because of problems in
    reaching 520. Then full cutover was postponed to 1 Jan 1997 in Tucson
    and to 1 July 1996 in Yuma, Flagstaff, and Prescott. However, some
    new prefixes, in 520 only, are to be added in Tucson in Nov 1995.
    602-696 is to be available in the southern Arizona LATA; similarly,
    602-671 is to be available in the northern Arizona LATA.
303/970 Colorado, 2 Apr 1995 (full cutover 14 Jan 1996)
    Full cutover was to be 1 Oct 1995, but US West cited "continuing
    call routing difficulties" and a "decline in originally projected
    code demand."
813/941 Florida, 28 May 1995 (full cutover 3 Mar 1996)
703/540 Virginia, 15 July 1995 (full cutover 27 Jan 1996, changed from
    13 July 1996)
404/770 Georgia, 1 Aug 1995 (full cutover 1 Dec 1995)
    Georgia Public Service Commission voted 3-2 in Apr 1995 to make this
    a geographic split.
203/860 Connecticut, 28 Aug 1995 (full cutover 4 Oct 1996)
615/423 Tennessee, 11 Sept 1995 (full cutover 26 Feb 1996)
    249 was "too close to some exchanges in Kingsport" and 931
    "could be confused with the 901 area code for Memphis".
305/954 Florida, 11 Sept 1995 (full cutover 13 Apr 1996 for pagers,
    1 June 1996 for landlines, and 1 Jan 1997 for cellular)
    This was to be a wireless overlay, to take effect 1 Mar 1995, but the
    Florida Public Service Commission ruled that it would be geographical
    with Broward County going to 954 and Dade and Monroe counties staying
    in 305; noted as such in Bellcore letter IL-95-08-011 (23 August 1995),
    which is the source for the above dates.
904/352 Florida, 3 Dec 1995 (full cutover 20 May 1996)
    Earlier reports indicated that this new area code would be 850.
    Jacksonville, Tallahassee, Pensacola were to stay in 904; Gainesville,
    Ocala, Daytona Beach were go to 352. It was then decided to keep Daytona
    Beach (and Volusia County) in 904; the split line had basically been a
    line from Crystal River east to Daytona Beach and south.
809/441 Caribbean area, 1 Oct 1995 (full cutover 30 Sept 1996)
    441 is for Bermuda only.
503/541 Oregon, 5 Nov 1995 (full cutover 30 June 1996)
803/864 South Carolina, 3 Dec 1995 (full cutover 1 May 1996)
    Greenville LATA to 864; Charleston, Columbia, Florence stay in 803.
314/573 Missouri, 7 Jan 1996 (full cutover 7 July 1995)
    The state PUC voted for a geographic split, not an overlay.
708/847 Illinois, 20 Jan 1996 (full cutover 20 Apr 1996)
    See 312/708/630 note for further information.
214/972 Texas, 1 Feb 1996 (overlay, to get all newly-assigned numbers)
216/330 Ohio, 9 March 1996 (full cutover June 1996)
    State PUC decreed another split, to occur June 1997 in 216.
612/320 Minnesota, 17 March 1996 (full cutover 15 Sept 1996)
    Also at this time, five communities (biggest of which is apparently
    Red Wing) to southeast of the Twin Cities will switch from 612 to 507.
708/630 Illinois, 3 Aug 1996 (what date for full cutover?)
    See 312/708/630 note for further information.
604/250 British Columbia, 19 Oct 1996 (full cutover 1 June 1997)
312/773 Illinois, Oct 1996
    312 was to get some relief through use of area code 630 (but that
    idea was cancelled when 630 was then planned as one of two new codes
    to be formed from a split of 708). Then 773 was planned for downtown,
    but still later it was decided to use 773 for outside of downtown,
    leaving downtown in 312.
310/562 California, 1 Feb 1997 (full cutover 6 months later)
    562 was originally designed as a wireless (cellular/pager) overlay
    for area codes 213, 310, 818. But eventually the PUC on 11 Aug 1995
    voted for a geographic split of 310, with the 1 Feb 1997 effective
    date and 6 month permissive dialing, even though 310 was only created
    in 1991.
818/626 California, March 1997? (overlay or geographic split)
216/??? Ohio, June 1997
    See 216/330 note.
619/760 California, 1997?
809/340 Caribbean area, no date available
    340 is for Puerto Rico only.

Area codes 706,903,905 had been used, at least in the U.S., for calling
parts of Mexico. (These codes were later announced for Georgia, Texas,
and Ontario respectively.) In 1980, 903 was reclaimed, replaced by 706
when northwestern Mexico border towns were renumbered to conform with
Mexico (+52) 6. On 1 Feb 1991, 706 and 905 were discontinued for calls
to Mexico (which was and still is reachable in country code 52).