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 | | 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. |
 | | 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). |
 | | 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. |
| massis.lcs.mit.edu /telecom-archives/archives/areacodes/history.area.splits.2-96 (2552 words) |
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