However, the data source it suggests (1999 US Census data) is worthless here in Northern MA. Natick and Woburn (20 miles apart) have the same lat/long coordinates!

Not only obsolete, but wrong from its inception. The USPS and US Census Bureau have pointers to what is probably the closest thing to an "official" list of ZIP code locations. One trouble with any static source is that ZIP codes get added fairly often, so any static data source is quickly obsolete. With the Census Bureau's TIGER data, there is also the problem that there are ZIP codes the Census Bureau doesn't care about, as they are non-residential, e.g. some businesses may have their own ZIP codes.

emc

Information about American English usage here and here.

Any New York City or Connecticut area jobs? I'm currently unemployed.

In reply to Re^3: ZIP code distances by swampyankee
in thread ZIP code distances by jrmtreebeard

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