CA: Coronado and southern/eastern suburbs of San Diego
(National City, San Ysidro, Chula Vista, El Cajon, Dulzura, Jacumba)
707
369
CA: Solano County
707
627
CA: Napa, Sonoma Counties
714
657
CA: northern Orange County, Anaheim
(OVERLAY)
760
442
CA: far north suburbs of San Diego
(Oceanside, Escondido)
818
747
CA: Agoura, Canoga Park, Reseda,
Van Nuys
909
951
CA: Riverside, Hemet, Temecula
(SPLIT, was to be part of phased split and overlay plan)
909
752
CA: San Bernardino, Ontario, Pomona
(OVERLAY, was to be part of phased split and overlay plan)
312 773
872
IL: entire city of Chicago
(OVERLAY on 312 and 773)
630
331
IL: Aurora, DuPage County, suburbs
west of Chicago (OVERLAY)
708
464
IL: La Grange, Harvey, Chicago Heights,
suburbs south and west of Chicago
(OVERLAY)
847
224
IL: north suburbs of Chicago
(overlay [*])
(Overlay may be reinstated late Spring or early Summer 2001)
248
947
MI: Pontiac, Oakland County
(OVERLAY)
313
679
MI: Detroit
(OVERLAY)
517
989
MI: Saginaw (split reinstated by MPSC, eff. 4/7/01)
734
278
MI: Ann Arbor, Monroe, southeastern Michigan
west and south of Detroit
(OVERLAY)
810
586
MI: Flint, Warren, Port Huron
(OVERLAY cancelled)
810
586
MI: Macomb County (Warren)
(overlay turned into a SPLIT, eff. 9/22/01)
The California Public Utilities
Commission has suspended all splits and overlays in order to study the
effect of new number pooling efforts. However, some voices, including within
the Commission, feel that it is unwise to impose the current draconian rationing
measures with little if any provision for making new numbering resources available.
Although backup split plans have been drafted for some areas, no mechanism for
activating them has been approved. The 310/424 area, which was to have been the
first overlay, now appears likely to be the first of the reborn splits to take
place. The portion of 310 south of LAX Airport and the Imperial Highway/I-105,
will split to the new 424 area code.
Illinois is in a similar situation. The overlays shown above for the
greater Chicago area have been deferred, pending analysis of number pooling
efforts. However, if any of the affected areas runs out of numbers, the overlay
can be activated on an abbreviated timetable. Planning is also underway for a backup
overlay plan for the 815 area code. The 847 area code was declared to be exhausted
(no prefixes available for assignment) in January 2001, setting in motion a chain
of events likely to activate the 224 overlay in May or June 2001.
The state of Michigan finally settled its jurisdictional issues by
passing a law explicitly granting the PSC oversight of area code issues. The
overlays planned for the Detroit area were cancelled, but the 810/586 relief
plan has now been reborn as a geographic split. The 517/989 split was postponed
twice, but appears to be on track to happen in April 2001.
More details about area code splits and overlays can be found on the
AreaCode-Info pages, maintained by
John Cropper and
Eric Morson. (John Cropper's company
is called "LINCS"; note that the similarity of names is coincidental
-- I have no connection with LINCS.) There is also an excellent listing of
state/provincial regulatory
agencies provided by the state of New York.
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