The answer to the question - Where is the prison in the game GTA 5 on the map - the mark. The main character in the single player game is constantly in contact with the state police, wait and stuff, but never went to jail in the game, because the developers of the game for some reason decided not to make this system, so your character, for which you play - appears at the nearest police department.
Since our character has no way to get to the prison after being detained by the police, you can get to it by yourself, on the picture below there is a mark where this prison is, you can go there by yourself, but don't forget that the prison is heavily guarded. As soon as you go beyond the fence of the prison - you will automatically get wanted and you will be followed not only by the guards of this prison, but also by the state police.
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