Dave Huang amends the area code list:

> I got most of this information from http://www.bellcore.com/NANP/codes.html,
> which sometimes isn't very detailed about which side of an area code
> split cities get put on, so I had to look at a map and guess. Those of
> you living in an area code which has been split might want to check to
> see if I got it right :)

For Chicago the area code split is as follows:

312:Chicago (downtown):Illinois:IL
773:Chicago (non-downtown):Illinois:IL
847:Chicago (north suburbs):Illinois:IL
630:Chicago (west suburbs):Illinois:IL
708:Chicago (south suburbs):Illinois:IL

The phone book lists precisely which suburbs of Chicago belong
to which area code, but there are about 120 of them in 847 and
60 of them in 630, so listing them all here would be a mess.

Eric