Public transportation in the United States

The United States is served by a wide array of public transportation, including various forms of bus, rail, ferry, and sometimes, airline services. Most public transit systems are in urban areas with enough density and public demand to require public transportation; most US cities have some form of public transit. In more auto-centric suburban localities, public transit is generally less frequent and less common. Most public transit services in the United States are either national, regional/commuter, or local.

In the United States, public transportation is sometimes used synonymously with alternative transportation, meaning every form of mobility except driving alone by automobile. This can sometimes include carpooling, vanpooling, on-demand mobility (i.e. Uber, Lyft, Bird, Lime), infrastructure that is oriented toward bicycles (i.e. bike lanes, sharrows, cycle tracks, and bike trails), and paratransit service.