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.

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Liberty City/New York Landmarks, GTA Wiki

Visiting GTA 5's North Yankton,Ludendorff In Real Life(Bismarck, North Dakota)- GTA 5 Lore Explained

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

I'm hoping to see multiple larger cities. Gta 5 had Los Santos and a series of tiny towns spread across the map and I think it made those towns essentially useless.

What makes GTA Vice City's map the best one so far: A deep dive into the location and inspiration behind it

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Carcer City, GTA Wiki

Liberty City, GTA Wiki