Hi Dave :)
    Um... no... there could be two occurrances (sp) of an exchange within
the same zip code.... this can happen (and just did in the Portland, Oregon
area this weekend) when an new area code "overlays" an existing area code or
codes.

   Starting Sunday, 01 October, 2000, here in Portland, and most of the
Willamette Valley!, the 971 area code was overlaid on the 503 area code...
so we now dial 10 digits.... but the new 971 area code could easily have the
246 exchange in the zip code 97221 which has a lot of new phone numbers
being installed due to a lot of second phone lines being installed for
existing clients/businesses...

   What might work for you would be to cross-reference the first 2 digits of
the zip code (ie 97 for Oregon) with the area code and prefix ... the first
2 digits of a zip code don't (IIRC) cross state boundaries and area codes
don't cross state lines...

Art "off to reprogram my speed dials hehe" Bahrs

----- Original Message -----
From: "Knox, Dave (Dallas, TX)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, October 01, 2000 9:46 AM
Subject: [HP3000-L] ZIp Code/Area Code Cross Ref


> Esteemed listers...
>
> With constant changes to US phone number area codes, I wish to validate
> contact information contained in an image database. Ideally via zip code,
> but of course this is far from absolute, as one zip code may contain
> multiple area codes.
>
> What does appear to be unique is the zip code + exchange (first 3 of the
7).
> Am I correct to assume this ?
>
> Virtually every resource I've found lists only a primary area code for a
> given zip. The others are expensive GUI packages, and/or "data cleaning"
> services.
>
> Can anyone tell me where I could find a simple ascii file listing all zip
> codes, exchange numbers and resultant area codes.
>
> Examples...(if you want to check)
>
> Zip + NXX = Areacode
>
> 75025 + 495 = 214
> 75025 + 633 = 469
> 75025 + 712 = 972
>
> TIA
> Dave