Police officers in the 55 Precinct included:

• Coby Bell as Off. Tyrone 'Ty' Davis Jr.
• Jason Wiles as Off. Maurice 'Bosco' Boscorelli
• Skipp Sudduth as Off. John 'Sully' Sullivan
• Molly Price as Det. Faith Yokas
• John Michael Bolger as Lt. Johnson
• Tia Texada as Sgt. Maritza Cruz (Anti-Crime Unit)
• Joe Lisi as Lt. Swersky
• Nia Long as Off. Sasha Monroe (IAB Detective)
• Josh Stewart as Off. Brendan Finney
• Charles Haid as Capt. Cathel 'C.T.' Finney
• Brad Beyer as Sgt. Jason Christopher
• Ernest Mingione as Desk Lt. Kowalski
• Michael Arthur as Cop
• Charlie McWade as Off. Steve Gusler
• James Rebhorn as Captain Elchisak
• Nick Chinlund as Detective Tancredi
• Tasha Lawrence as Detective Kyser
• Wendell Pierce as Officer Conrad 'Candyman' Jones
• Aidan Quinn as Lieutenant John Miller
• Tim Kang as Detective Kent "Yoshi" Yoshihara
• James Murtaugh as Chief McInerney
• Sterling K. Brown as Officer Dade
• Phil Campanella as Cop in Traffic
• Marcia Strassman as Sergeant Laura Wynn
• David Wolos-Fonteno as Captain Haynes
• Carol Woods as Lt. Rice
• Chris Bagnall as Detective Mills
• Ann Dowd as Sgt. Beth Markham
• James Remar as Det. Madjanski
• Philip Levy as Chief Rodgers
• Greg D'Agostino as Uniformed Cop
• Sonny Vellozzi as Detective
• Ron Wall as Desk Sergeant
• Paul Michael Glaser as Captain Jack Steeper
• Todd Williams as Detective Barlow
• Joseph Lyle Taylor as Detective
• David Eigenberg as Off. Benny Ross
• Brian Haley as Detective Kent
• Kevin P. McCarthy as Crime Scene Detective
• Mykelti Williamson as Detective Dante Rice