where is san andreas and vice city wikis?
To my knowledge, there isn't one. If there were, they're probably created by either GTA-crazed or users who "think they are better among wikia" blocked from this wiki. We have plenty of Vice City and San Andreas articles here, so look into them here and save time from searching websites for them. (I sound like an advert guy lol)
Everything about the Grand Theft Auto series is on this website... There are no individual wikipedia websites for specific games.