Party rooms are exclusive rooms that are only available for the duration of a party, although there are some that appear directly before or after a party. Some are only accessible by members. All party rooms in Club Penguin use a .swf named "partyX", where X represents a number from 1 through 27. New party rooms overwrite older ones.
- Although not common, some pins have been hidden or obtainable in party rooms, only available during the duration of the party the room appeared in.
- The parties with the most party rooms were the Medieval Party 2012 and Prehistoric Party 2016 (when combined with Operation: Crustacean), with each having a total of 27 party rooms. Prior to this, the Medieval Party 2011 had the most, with 23.
- The Stadium, Cave Mine, Hidden Lake, Underwater room, and Mall all first appeared as party rooms before becoming normal rooms.