This is a list of bus routes operated by the Washington Metropolitan Area Transit Authority (WMATA), branded as Metrobus. Many are the descendants of streetcar lines operated by the Capital Transit Company or its predecessors.

Current routes

The list of Metrobus routes has been split by region:

Numbering

Most Metrobus routes follow the rules below: Odd-numbered routes are typically part-time variants of even-numbered routes. At one time, odd numbered routes were express routes, but that distinction has been abandoned. Most Maryland and Washington, D.C., routes are grouped by their first digit. When this system was laid out in 1936, the following clustering was used:

Divisions