You have to purchase a database. ZIP codes are not geographic, you
can't calculate lat/lon from them. Here is one source:
http://www.zipwise.com
On Jun 26, 2005, at 6:43 PM, Scott Gifford wrote:
> Jack Lauman <jlauman@stripped> writes:
>
>
>> A couple of months ago these was a discussion about ZIP code plotting
>> on this list. Does anyone know how to calculate LONG/LAT coordinates
>> from ZIP+4?
>>
>
> In the U.S., you can use the census data:
>
> http://www.census.gov/geo/www/gazetteer/places2k.html
>
> ----ScottG.
>
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