Pretty sure you're already aware, but:I'm think that to make this clear, it would be best to keep it to a max of three cities for any given campaign setting, with wildcard entries for other reasons (such as Baldur's Gate).
...
Others
Village of Hommlet (module)
Lanhmar (Campaign Setting)
City State of the Invincible Overlord (3PP, Judge's Guild)
City of Brass
Menzobarranzan
Baldur's Gate
Neverwinter
Phandalin?
Saltmarsh?
Ideas? If there is something missing (and I am sure there is) that you think ABSOLUTELY has to be included, make the case.
<> Hommlet and Saltmarsh are GH
<> Menzobarranzan, Baldur's Gate, Neverwinter, and Phandalin are FR
<> Lanhkmar is both city and setting (like Greyhawk)
Sadly, I suspect a large number of these won't be known by the average poster. I know I had to do a wiki search (plus check some of my old books) to find some of these.