I know this thread is old but I found a great website for inexpensive
developer and marketing lists for zip codes. Plus they give free
updates.

http://www.listfactor.com

They have lists for united states zip codes, cities, and counties. I
needed the counties and found that there are ove 3000 in the united
states! Didn't know that.

Brandon

You can also get the US/Canada/Mexico zip code database from
http://www.zipcodeworld.com

---