Baldur's Gate 27
Blackmoor 18
Calimport 17
City of Brass 25
City state of the Invincible Overlord 20
Free City of Greyhawk 23
Glantri City 14
Huzuz 24
Lankhmar 24
Palanthas 16
Phandalin 15
Sharn 23
Sigil 25
Solace 22
Specularum 20
Stormreach 19
Tyr 21
Village of Hommlet 4
Lankhmar isn't really a D&D iconic city, it's an iconic fantasy setting. It's like saying Minas Tirith or Rivendell is an iconic D&D city..