List of trolleybus systems in the United States

This is a list of trolleybus systems in the United States by State. It includes all trolleybus systems, past and present. About 65 trolleybus systems have existed in the U.S. at one time or another. In this list, boldface type in the "location" column and blue background colored row indicates one of the five U.S. trolleybus systems still in operation.
New Jersey.
The operator conducted a demonstration at Weehawken in 1934 prior to opening of public service with ASVs in 1935. Weehawken was served by the Newark system.
The Newark ASV system also served many adjacent towns, including the Hudson County towns of Bayonne, Jersey City, Hoboken, Union City and West New York, the Passaic County towns of Passaic and Paterson, and the Union County towns of Elizabeth and Plainfield.
Washington.
Dual-mode (diesel-trolley) buses operated 15 September 1990 – 24 January 2005 on routes using the Downtown Seattle Transit Tunnel. The overhead wire system in the tunnel was not connected to that used by surface trolleybus services.