Like most rapid transit systems in the United States,<ref>Template:Cite news</ref> ridership has not recovered from COVID-19 era collapses, falling from an average weekday ridership of 764,300 in the first quarter of 2015<ref name=APTA>{{#invoke:citation/CS1|citation
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}}</ref> to 519,700 in the fourth quarter of 2024.<ref name="APTA2024">{{#invoke:citation/CS1|citation
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}}</ref> Nevertheless, the Washington Metro remains the second-busiest rapid transit system in the United States behind the New York City Subway. Template:As of, the system has 98 active stations on six lines with Template:Convert of tracks.
The Washington Metro system was conceived as an alternative to constructing a large freeway system throughout the Washington, D.C. area. It was partially financed with funds originally dedicated to highway construction.<ref>Template:Cite book</ref> Construction began in 1969, and in 1976 the first section of the Metro system opened along the Red Line between the Template:Wmata and Template:Wmata stations in Washington, D.C. Throughout the 1970s and 1980s, more stations were opened in the city and the suburban communities of Arlington County, the City of Alexandria, and Fairfax County in Virginia as well as Montgomery and Prince George's Counties in Maryland. By 1991, five rail lines were open: the Red, Orange, Yellow, Green, and Blue Lines. The system, as originally planned, was completed in 2001 with the extension of the Green Line to Template:Wmata. In 2004, three stations were opened: an extension of the Blue Line to the Template:Wmata and Template:Wmata stations and the first infill station, Template:Wmata.<ref name="WMATA History">{{#invoke:citation/CS1|citation
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}}</ref> The Silver Line opened in two phases, adding five stations in 2014 and six in 2022.<ref name=silverstations>Template:Cite news</ref><ref name=metrofacts>{{#invoke:citation/CS1|citation
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}}</ref> On the Yellow and Blue Lines, an additional infill station at Template:Wmata opened on May 19, 2023.<ref>Template:Cite news</ref>
Nine Metrorail stations are officially designated transfer stations, although other intermediate stations also allow passengers to transfer between lines. Four of these stations have separate, perpendicular upper and lower levels, which opened at different times. Two other transfer stations, Template:Wmata and Template:Wmata, have parallel stacked platforms. Ten stations are termini (stations at the end of lines); several other non-terminus stations are used to short turn trains in regular service.<ref name=stationlist/>
The busiest station in the system in 2023 was Metro Center, with more than 3.9 million passenger entries over the course of the year.<ref name="Data">{{#invoke:citation/CS1|citation
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}}</ref> Rosslyn was the busiest station in Virginia, while Silver Spring was the busiest in Maryland. The system's 10 busiest stations are all located in Washington.
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There are six Washington Metro lines, each named for a different color.<ref name="stationlist">{{#invoke:citation/CS1|citation
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}}</ref> All lines except the Red Line share tracks.
Pylon by the entrance to the Archives stationPassengers boarding a train at the Bethesda stationCrossvault of the L'Enfant Plaza stationUnion Station, the busiest station in the systemThe longest continuous escalator in the western hemisphere, at the Wheaton station<ref name=metrofacts />Vaulted ceiling at Farragut WestDowntown Largo station, one of the newest stationsArlington Cemetery station on a snowy dayElevated platform at National AirportWiehle-Reston East station on the first day of Silver Line service in 2014
Template:Note label Stations noted in this list twice with upper and lower levels are considered by WMATA as a single station. The levels are noted separately here because they opened on different dates.
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