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.

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

GTA 6 location wishlist: Where we'd like to see GTA Vice City return to

GTA 6 map with real locations : r/rockstar

GTA 5 map comparison to major cities. : r/gaming

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.

GTA maps and their real life counterparts : r/MapPorn

All 15 Real Life Locations In GTA 5 (Map & Guide) - 🌇 GTA-XTREME

GTA 6 Release Date, Map, Missions, Characters & Other Leaks - GTA BOOM

Grand Theft Auto 6 - Which locations were revealed in the major leak - RockstarINTEL

Architecture in Video Games: The Satirical Urban Commentaries of Grand Theft Auto - Architizer Journal