What cities are the GTA games based on?

The original game's map encompassed <b>three</b> cities, but later titles tend to focus on a single locale, usually one of the original three.

Question

The original game's map encompassed three cities, but later titles tend to focus on a single locale, usually one of the original three.

Hagrid P Hazard · Accepted Answer

The original game's map encompassed three cities, but later titles tend to focus on a single locale, usually one of the original three.