Rules for each division are posted here and also listed below.
Don’t forget that pitchers can now finish an at-bat to the current batter when crossing a days-of-rest or pitch limit threshold. They then observe rest required for the threshold crossed in that final batter, not the total pitch count. See the rules for the exact details of this change from a few seasons ago.
Here is a document that describes the Little League pitch count rule along with a log for keeping track of pitching during a game.
2017 Season Rules.