Springfield Penitentiary is the main prison in Springfield.
Homer was held at Springfield Penitentiary after he was framed for committing financial fraud at Ziffcorp. However, he was released a day afterwards and replaced with Artie Ziff when he decided to do the right thing and turn himself in. Mr. Burns was also placed in the Springfield Penitentiary after it was discovered that he stole the Concert painting, but Homer, Lenny, and Carl busted him out in order to replace Waylon Smithers. The Springfield Penitentiary was also forced to release all minor offenders due to cutbacks as a result of a major financial crisis.
Current and former inmates of Springfield Penitentiary:
- Sideshow Bob (current)
- Walt Warren (former)
- Homer Simpson (former;twice in episode "Sex, Pies, and Idiot Scrapes" and "The Ziff Who Came To Dinner)
- Artie Ziff (current)
- Snake Jailbird (former)
- Dwight Diddlehopper (current)
- Charles Montgomery Burns (former)
- Prisoner 3230 (former)
- Mona Simpson (former)
- Frank Grimes, Jr. (current)
- Fat Tony (former)
- Legs (former)
- Louie (former)
- Johnny Tightlips (former)
- Russ Cargill (persumed)
- Groundskeeper Willie (persumed)
- Episode – "Krusty Gets Busted" (Mentioned)
- Episode – "Marge Simpson in: "Screaming Yellow Honkers""
- Episode – "The Ziff Who Came to Dinner"
- Episode – "I Don't Wanna Know Why the Caged Bird Sings"
- Episode – "The Burns and the Bees"
- Episode – "American History X-cellent"
- Episode – "The Bob Next Door"
- Episode – "Donnie Fatso"
- Episode – "The Ned-liest Catch" (Mentioned)
- Episode – "Blazed and Confused"
- Episode – "Teenage Mutant Milk-caused Hurdles"
- Book – Chief Wiggum's Book of Crime and Punishment
- Video game – The Simpsons: Tapped Out