Do you have Microsoft Excel or a similar spreadsheet program? If you
enter the zip codes in one column, sort them, then chose subtotal, counts.
It will product a report telling you how many of each zip code were found.
You can also collapse the rows leaving only the sub-totals. This is a PC
or Mac solution. I also like a data base called Panorama on the Macintosh.
I blieve an add on for Panorama will convert the numeric zip codes to
their location names. Their web site is http://www.provue.com/.