The following is a
list of all light rail systems in the United States, ranked by ridership. Also included are those urban
streetcar/trolley systems that are providing regular public transit service (i.e. operating year-round and at least five days/week). This list does
not include statistics for
metro/rapid transit systems (see: the
List of United States rapid transit systems by ridership for those). Daily and annual ridership figures are based on "average weekday
unlinked passenger trips" (where transfers between lines are counted as two separate passenger "boardings" or "trips"). The annual ridership figures for 2014 and average weekday ridership figures for the fourth quarter (Q4) of 2014 come from the
American Public Transportation Association's (APTA) Ridership Reports statistics for the second quarter (Q4) of 2014, unless otherwise noted (e.g.
NJ Transit systems). References with supplementary (i.e. non-APTA) ridership figures are included in the
System column.