As mentioned in the summary, we reduce the overall file size by combining ZIP+4 ranges within the same latitude and longitude. For example, an address with the ZIP+4 of 12345-0800 would match to the first record shown below because 0800 is within the range of 0001-0999.
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Comma-Separated Values (CSV) Text File
This is the Official U.S. Postal Service five digit ZIP Code.
A 4-digit Beginning +4 Number. This is the starting range for the ZIP+4 code.
A 4-digit Ending +4 Number. This is the ending range for the ZIP+4 code.
The Latitude is a number followed by up to 6 decimal positions.
The Longitude is a number followed by up to 6 decimal positions. A negative sign indicates the Western hemisphere.