This is an all-time list of streetcar (tram), interurban and light rail systems in the United States, by principal city (or cities) served, and separated by political division, with opening and closing dates. It includes all such systems, past and present; cities with currently operating systems, and those systems themselves, are indicated in bold and blue background colored rows. It is one in a group of lists that collectively cover all countries of the world; the other lists are indexed at List of town tramway systems. This is not a list of streetcar operating companies. It is a list of U.S. cities that were the focus or base of a streetcar system at one time, with starting and ending dates for each general type of streetcar service (e.g. horsecar, electric streetcar) in each city or metropolitan area. "System", as used in the article title, refers collectively to all streetcar infrastructure and rolling stock in a given metropolitan area, used by any of several different operating companies over many years, often passing from one operating company to the next. The "Name of system" column is intended to distinguish the few cases where two distinctly different systems were in operation in one city at the same time, but is also used to identify operators that have a Wikipedia article. In many U.S. cities, the streetcar system was operated by a succession of different private companies during the years in which the system existed. The use of the diamond (♦) symbol indicates where there were (or are) two or more independent streetcar (or light rail) systems operating concurrently within a single metropolitan area. Usually, this refers either to interurban lines connecting the area's principal city with other cities or to cases where separate cities within one metropolitan area were served by independently operated streetcar systems. Unless otherwise noted in the "Type" column, all systems listed were/are conventional streetcar (tram) systems (although some past systems might have been termed light rail if that 1970s-introduced term had existed at the time they were in operation). Interurban and light rail systems are noted in that column for convenience. For lists of existing systems only, see the following:

Alabama

Arizona

Arkansas

California

Colorado

Peschkes (Part Four, 1998, Page 59) states that, despite various evidence, the following town did not have a tramway:

Connecticut

Delaware

District of Columbia

Florida

Georgia

Peschkes (Part Four, 1998, Page 44) states that, despite the assumption of another historian, there is no evidence for tramways in the following towns:

Hawaii

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Montana

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming