The precinct number in Brooklyn Nine-Nine is 99. The series follows the detectives and staff of the fictional 99th Precinct of the New York City Police Department in Brooklyn.
The precinct's number is central to the show's identity. Characters regularly refer to their workplace as the Nine-Nine, and the phrase becomes a team slogan used during celebrations, roll calls, and moments of solidarity. The setting also gives the series its title: Brooklyn Nine-Nine refers to the Brooklyn-based 99th Precinct.
The precinct is fictional, but the show uses recognizable elements of New York police culture and Brooklyn geography. Captain Raymond Holt takes command of the squad in the pilot, where he immediately clashes with Jake Peralta's informal style and exceptional arrest record. The tension between Holt's discipline and Jake's unconventional methods drives much of the early comedy.
The number is sometimes confused with a real NYPD precinct because the series presents its workplace with procedural detail. In the story, however, the 99th Precinct is an invented setting created for the sitcom.