Which of these is not the name of a city in the Grand Theft Auto series?

The answer is San Andreas because San Andreas is not the name of a city in the Grand Theft Auto series, but rather the name of one of the fictional states in the game. Grand Theft Auto: San Andreas is set in the state of San Andreas, which includes multiple cities such as Los Santos, San Fierro, and Las Venturas. Therefore, San Andreas is not a city but rather the name of the state in which the game takes place.