Cities and states - Fictional

Liberty City - New York City (Grand Theft Auto, Grand Theft Auto III, Grand Theft Auto Advance, Grand Theft Auto: San Andreas (featured prominently in one mission) and Grand Theft Auto: Liberty City Stories)
Vice City - A city based on Miami (Grand Theft Auto , Grand Theft Auto: Vice City and Grand Theft Auto: Vice City Stories); the Vice City and Vice City Stories renditions of the city are suggested to be located in the state of Florida.
San Andreas - San Francisco (Grand Theft Auto)
San Andreas - A state based upon California and Nevada (Grand Theft Auto: San Andreas).
- o Los Santos - Los Angeles
- o San Fierro - San Francisco
- o Las Venturas - Las Vegas
Anywhere City - Unknown (Grand Theft Auto 2)
Carcer City - Most likely Detroit or Newark, but could be many other cities. Said to be neighboring Liberty City (Manhunt takes place in Carcer City; mentioned in Grand Theft Auto III, Grand Theft Auto: San Andreas, Grand Theft Auto: Liberty City Stories, and Grand Theft Auto: Vice City Stories)
New Guernsey - New Jersey (Grand Theft Auto)
Hackenslash - Hacksensack (Grand Theft Auto)
Fort Law - Fort Lee (Grand Theft Auto)
Guernsey City - Jersey City (Grand Theft Auto)