What police department did Martin Crane retire from?

Martin Crane retired from the Seattle Police Department.

Before becoming Frasier and Niles Crane's gruff father and reluctant apartment companion, Martin was a Seattle police detective. He served in several roles, including patrol officer, mounted patrol officer, vice detail, and homicide detective.

Martin's police career ends after he is shot in the hip while interrupting a convenience-store robbery in 1991. The injury leaves a bullet lodged in his hip and forces him to retire at age 59. His cane and mobility problems become important parts of the original series' premise because they lead him to move in with Frasier.

The department is sometimes confused with a generic city police force because the show rarely treats Martin's former job as its central subject. The canonical answer is specifically the Seattle Police Department, matching the show's setting. Martin's law-enforcement background also explains his practical outlook and his frequent clash with his sons' academic, psychiatric world.