In October 2011, the B110 was reported in several New York newspapers to have signs requiring female passengers to sit in the back to avoid possible contact with men, as is considered necessary by some Hasidic Jewish groups in the area it serves. Buses on the B110 route do not accept MetroCard, instead charging a one-way exact change fare of US$5.00. This route is operated by Private Transportation Corporation under a franchise with the City of New York, and is the only unsubsidized route operating in Brooklyn. All routes operate local service only except the B6, B35, B38, B41, and B49, which also have limited-stop service, as well as the B44, B46, and B82, which also have Select Bus Service. Routes in this section are operated by New York City Transit. Connections to New York City Subway stations at the bus routes' terminals are also listed where applicable. Routes marked with an asterisk (*) run 24 hours a day. Service operation is generally defined as: List of express bus routes in New York City: BM1, BM2, BM3, BM4, BM5, X27, X28, X37, X38.List of bus routes in Staten Island: S53, S79 Select Bus Service, S93.For details on routes with other prefixes, see the following articles: This table gives details for the routes prefixed with 'B' - in other words, those considered to run primarily in Brooklyn by the MTA.

Only the B32, the eastern section of the B82 (then the B50), the B83, and the B84 were created by New York City Transit from scratch, in 1978, 1966, and 2013, respectively. Of the 55 local Brooklyn routes operated by the New York City Transit Authority, roughly 35 are the direct descendants of one or more streetcar lines, and most of the others were introduced in full or in part as new bus routes by the 1930s.

Many of them are the direct descendants of streetcar lines (see list of streetcar lines in Brooklyn) the ones that started out as bus routes were almost all operated by the Brooklyn Bus Corporation, a subsidiary of the Brooklyn–Manhattan Transit Corporation, until the New York City Board of Transportation took over on June 5, 1940. The Metropolitan Transportation Authority (MTA) operates a number of bus routes in Brooklyn, New York, United States one minor route is privately operated under a city franchise.

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