It seems that there are some kind call accounting software companies that provide demo's. I have added the US lookup and it now finds the city. Modified the code to look for 6 digits, on 7,10, or 1 plus dialing.
The database size increase causes a longer lookup but from my testing, it finds most places. If it doesn't find a match it will inform you that it isn't priced.
I'm going to repackage this so that I have the lite versus full versions. If anyone wants to have a go at testing, let me know and I'll provide a download link.