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Zip codes and Post codes

Last updated: 24 Sep 2010

USA Zip codes are available from:

• The v96 CD-ROM includes zipcode.apr, zipcode.adx and zipcode.dbf. zipecode.dbf in the Extra\Dbases directory (78,000 listings)
• Download ZIPCODE.ZIP from IBM's Lotus Approach support site: http://www-3.ibm.com/software/lotus/support/approach/support.html.
• http://www.lycos.com (enter zipcodes)
• Try the US postal service: http://www.usps.gov/

UK postcodes are made up of two parts: The first part (outward) contains the area and district. The second part (inward) is used by district sorting office and contains the sector and unit. There are 7 formats for post codes: AN NAA; ANN NAA; AAN NAA; AANN NAA; ANA NAA; AANA NAA; AAA ANA. A list of Valid outward post codes is contained in the mailsort database available from http://www.mailsorttechnical.com/. You can down load a very handy Approach database of UK postcodes (valid 2002) here:

     http://www.johnbrown.com.au/approach/Pcodes.exe [File size: Compressed = 205kb, "uncompressed" = 124kb]