> So where does one find zipcode.db?

In an earlier post Dan Diebolt shared this:

There is a 40,000+ zip code database in CivicSpace labs that has lat
and long by zip code:

 http://civicspacelabs.org/home/developers/download

 http://civicspacelabs.org/releases/zipcodes/zipcodes-csv-10-Aug-2004.zip