Which real-life cities have inspired the major cities of GTA?

Rockstar Games knew they had an absolute goldmine on their hands with GTA 3 and its expansive open world.

What city is each GTA set in?

Ranked: The World's Largest Cities By Population

Grand Theft Auto 6's Miami: The real-life locations that should inspire Vice City

Since a lot of games are based on real cities (GTA V: Los Angeles, etc.), do I have to create my game to be based on a real city? Is it okay

GTA 6 Map Leaks & Vice City Location: Where will GTA 6 be set

Fan visits GTA 6 trailer locations in real life - RockstarINTEL

What in Vice City (fictional) matches Miami (real) the best? - Quora

How close is the GTA 5 Los Santos to the real Los Angeles? - Quora

Carcer City, GTA Wiki

ALL Real Life LOCATIONS & Character Inspiration In The GTA 6 Trailer