M21 (New York City bus)

m21
Houston Street Crosstown
A New Flyer XE40 (5006) on the M21 near the West Side Yard
Overview
SystemMTA Regional Bus Operations
OperatorManhattan and Bronx Surface Transit Operating Authority
GarageMichael J. Quill Depot
VehicleNew Flyer Xcelsior XD40
New Flyer Xcelsior XE40
Nova Bus LFS HEV
Route
LocaleManhattan, New York, U.S.
Communities servedWest Village, SoHo, Lower East Side
StartWest Village – Spring St and Hudson St
West Village - 6th Avenue and Spring Street (PM rush hour)
ViaHouston Street
EndLower East Side – Grand Street and FDR Drive
Length2.5 miles (4.0 km)
Service
Weekend frequencyEvery 30 minutes
Operates6:30 AM-11:50 PM
Annual patronage313,686 (2024)
TransfersYes
TimetableM21
← M20  {{{system_nav}}}  M22 →

The M21 bus route constitutes a public transit line in Manhattan, New York City. The M21 operates between the West Village and the Lower East Side, serving as a Houston Street crosstown. The M9 and M21 are operated by the Manhattan and Bronx Surface Transit Operating Authority, and based out of the Michael J. Quill Depot.