The Bikini Bottom Jail, also known as the Bikini Bottom Prison, is a governmental institution in Bikini Bottom. It first appears in the episode "Hall Monitor."
The building is two stories high, with an over-sized ball-and-chain attached to it. The prison features a rock-crushing yard, cafeteria, and the jail cells. The inmates do many activities, such as crushing rocks, lifting weights, and making wire coat hangers and license plates. There have been many instances that involved some of the main characters going to jail.
A solitary confinement room supposedly made of sponge. (This may not be entirely accurate as Mrs. Puff was delusional at the time.)
A coat hanger factory. (This may be a reference to the cliché of a license plate factory being in prisons.)
A plankton-sized prison cell, actually a safe, seen in "Krabby Road."
A cafeteria that supposedly only serves chili.
A water supply that supposedly contains no uranium. As Mrs. Puff says in the episode "Doing Time," "Crystal clear!" (This may be a reference to the recent worry of mercury-contaminated water. This may also be a reference to Bikini Atoll, the location of Bikini Bottom was the site of 67 nuclear tests done by the U.S. government in the 1940s and 50s.)
Mrs. Puff has been in jail in "Hall Monitor," "No Free Rides," "Doing Time," "Ditchin'," and "Summer Job." In "Hall Monitor" and "Doing Time," Mrs. Puff was sent to jail because SpongeBob destroyed Bikini Bottom. In "No Free Rides," she stole SpongeBob's new boatmobile and crashed it into a police car. In "Summer Job," she was going to be sent to a Stoney Lonesome in the same outfit as "Hall Monitor." In "Ditchin'," she was sent to jail because she skipped Jury Duty.
It is also implied that she would go to jail in "Patrick-Man!" Patrick thinks she is breaking into a boatmobile, when in reality, she is trying to help one of her students who is locked inside and couldn't get out. Patrick throws a net over her and leaves a note that reads "Kops-This is boat theef." She is thrown into a paddy wagon, and one of the police asks if she remembers what a felony is.
She is also shown to be arrested in "Bumper to Bumper" after violating house arrest.