Seeing as no one has responded yet, I'll jump in. 😉
Are you just inserting zip codes into your database? How are they layed out? Ex:
98014
98456
93215
or
98521,98654,98541
Depending how it's layed out, you could accomodate it to suit your needs and fit your database, and use loops and arrays to and INSERT statements to insert into your table. I recently did that with a list of 100 names and email addresses, and inputed into my database using the fields
fname
lname
email
and it worked great!
Hope that helps.
Cgraz