These are all broken up by state, which is ok, but I needed just an MS
Access db of ALL of them. 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 cities and found that there are ove 30000 in the united
states! Didn't know that. I got all of the lists and created a
utility to convert from zip to city, city to county, etc.

Brandon