As of 2015, the exact number of buses in the Metropolitan Transit Authority, or MTA, express system is unknown; however, the New York MTA has 5,777 buses in its system and about 65 express routes. MTA New York City Transit operates 4,525 buses, while MTA Bus operates 1,252 buses. The buses cover approximately 2,816 miles.
The express routes of MTA Bus run buses between Manhattan and the boroughs of Brooklyn, Queens and the Bronx. These buses can be identified by a prefix indicating the boroughs on the route. For example, the QM6 runs between Midtown Manhattan and Lake Success, Queens. NYC Transit Express buses run between Manhattan and the other four boroughs and are identified by the prefix "X." For example, the X2 runs between Midtown Manhattan and New Dorp, Staten Island.