GTA San Andreas is a big PC game, its size is listed below. Well, Size varies with different versions of GTA San Andreas game.
Full version original PC Game setup size of GTA San Andreas is approx 3 GB when you download the game from somewhere from the internet and when you install the game, its size became approx 4.68 GB. However, Game setup size can vary due to different file compression.
Highly compressed GTA San Andreas Game setup size after removing radio sound from the game is approx 582 MB and when you install game its size became approx 4.65 GB.