What cities are featured in grand theft auto series?

Grand Theft Auto Online, the multiplayer component of Grand Theft Auto V, takes place in the fictional state of San Andreas, which is based on Southern California. Within this state the only explicitly named city is Los Santos, modeled after Los Angeles. The open‑world design allows players to roam across the countryside of San Andreas as well as the urban environment of Los Santos. No other fictional or real cities are mentioned in the provided source. Therefore, based solely on the evidence, Los Santos is the sole city highlighted in the series.