dattier@vpnet.uucp (David W. Tamkin) (02/20/90)
The zip code correlations of recent and imminent area code splits
having been under discussion of late, here is more about the 312/708
effect on zip codes than you wanted to know:
All 601xx and 605xx addresses that were in 312 are now in 708; those
that were in 815 are still in 815.
All 602xx and 603xx zips are in 708.
Small pieces of 60007, 60018, and possibly 60459 are in 312; otherwise
any 600xx or 604xx address that was in 312 is now in 708; any that was
in 815 is still in 815.
60650 and 60658 are entirely in 708. 60642 and 60648 are mostly in
708 with small pieces in 312.
60627, 60633, 60634, 60635, 60638, 60643, 60645, 60646, 60655, and
60656 have significant portions in both 312 and 708.
Small strips or pieces of 60630, 60631, 60652, and 60659 are in 708,
but those zips are mostly in 312.
[What makes nine of the divided zips "small part in one, mostly in the
other" and the other ten "significantly in both" is strictly my very
subjective evaluation.]
All other 606xx zips are entirely in 312.
Note, however, that it is quite possible for a mailing address and a
telephone site to be in different places: mail addresses can lead to
different branch, a private postal facility, or a post office box, and
telephone numbers can ring at a different branch, an answering
service, or voice mail. For cellular numbers and foreign exchange
lines, all bets are off. All in all, zip-phone correlations have more
curiosity value than practical reliability.
On related items, prefix (312) 309, incorrectly publicized as staying
in 312, is now in fact (708) 309. There was some confusion between
Ameritech Mobile and Illinois Bell on that one.
David Tamkin P O Box 813 dattier@vpnet.UUCP {ddsw1,obdient}!vpnet!dattier
Rosemont Illinois 60018-0813 No other vpnet user shares any of my opinions.
708-518-6769 312-693-0591 BIX: dattier GEnie: D.W.TAMKIN CIS: 73720,1570