Editing Washington Metro (section)

=== Opening dates ===
The following is a list of opening dates for track segments and infill stations on the Washington Metro. The entries in the "from" and "to" columns correspond to the boundaries of the extension or station that opened on the specified date, not to the lines' terminals.<ref name="facts 2017" />{{rp|3}}<ref>{{cite web|url=https://ggwash.org/view/35397/watch-metro-grow-from-one-short-line-in-1976-to-the-silver-line-today|title=Watch Metro grow from one short line in 1976 to the Silver Line today|last=Alpert|first=David|date=July 24, 2014|access-date=January 24, 2018|archive-date=January 25, 2018|archive-url=https://web.archive.org/web/20180125015347/https://ggwash.org/view/35397/watch-metro-grow-from-one-short-line-in-1976-to-the-silver-line-today|url-status=live}}</ref> The entries in the "stations" column exclude new platforms creating interchanges with existing stations on other lines.

{| class="wikitable"
|-
! Date
! Line at time of opening
!Current lines
! From
! To
! Stations
! Miles
|-
| March 27, 1976
| [[Red Line (Washington Metro)|Red]] (service created)
| rowspan="3" |Red
| {{wmata|Farragut North}}
| {{wmata|Rhode Island Avenue}}
| 5
| 4.6
|-
| December 15, 1976
| rowspan="2" | Red
| colspan="2" | Intermediate station ({{wmata|Gallery Place}})
| 1
| -
|-
| January 17, 1977
| Farragut North
| {{wmata|Dupont Circle}}
| 1
| 1.1
|-
| July 1, 1977
| [[Blue Line (Washington Metro)|Blue]] (service created)
|Blue, parts of [[Yellow Line (Washington Metro)|Yellow]], [[Orange Line (Washington Metro)|Orange]], and [[Silver Line (Washington Metro)|Silver]]
| {{wmata|National Airport}}
| {{wmata|Stadium–Armory}}
| 17
| 11.8
|-
| February 4, 1978
| colspan="2" | Red
| Rhode Island Avenue–Brentwood
| {{wmata|Silver Spring}}
| 4
| 5.7
|-
| November 17, 1978<ref>{{cite news |title=Subway Finally Comes to P.G. |work=Washington Star |date=November 17, 1978}}</ref>
| Orange (service created)
|Orange, part of Silver
| Stadium–Armory
| {{wmata|New Carrollton}}
| 5
| 7.4
|-
| December 1, 1979
| Orange
|Orange and Silver
| {{wmata|Rosslyn}}
| {{wmata|Ballston–MU}}
| 4
| 3.0
|-
| November 22, 1980
| Blue
|Blue and Silver
| Stadium–Armory
| {{wmata|Addison Road}}
| 3
| 3.6
|-
| December 5, 1981
| colspan="2" | Red
| Dupont Circle
| {{wmata|Van Ness–UDC}}
| 3
| 2.1
|-
| April 30, 1983
| Yellow (service created)
|Yellow, part of [[Green Line (Washington Metro)|Green]]
| Gallery Place
| {{wmata|Pentagon}}
| 1
| 3.3
|-
| December 17, 1983
| Yellow
|Yellow, part of Blue
| National Airport
| {{wmata|Huntington}}
| 4
| 4.2
|-
| August 25, 1984
| colspan="2" rowspan="2" | Red
| Van Ness–UDC
| {{wmata|Grosvenor–Strathmore}}
| 5
| 6.8
|-
| December 15, 1984
| Grosvenor–Strathmore
| {{wmata|Shady Grove}}
| 4
| 7.0
|-
| June 7, 1986
| colspan="2" | Orange
| Ballston–MU
| {{wmata|Vienna}}
| 4
| 9.0
|-
| September 22, 1990
| colspan="2" | Red
| {{wmata|Silver Spring}}
| {{wmata|Wheaton}}
| 2
| 3.2
|-
| May 11, 1991
| Yellow
|Yellow and Green
| Gallery Place
| {{wmata|U Street}}
| 3
| 1.7
|-
| June 15, 1991
| colspan="2" | Blue
| {{wmata|King Street–Old Town}}
| {{wmata|Van Dorn Street}}
| 1
| 3.9
|-
| December 28, 1991
|Green (service created)
| rowspan="2" |Green
| {{Wmata|L'Enfant Plaza}}
| {{wmata|Anacostia}}
| 3
| 2.9
|-
| December 11, 1993
| Green (separate segment)
| {{wmata|Fort Totten}}
| {{wmata|Greenbelt}}
| 4
| 7.0
|-
| June 29, 1997
| colspan="2" | Blue
| Van Dorn Street
| {{wmata|Franconia–Springfield}}
| 1
| 3.3
|-
| July 25, 1998
| colspan="2" | Red
| {{wmata|Wheaton}}
| {{wmata|Glenmont}}
| 1
| 1.4
|-
| September 18, 1999
| Green (connecting segments)
|Green
| U Street
| Fort Totten
| 2
| 2.9
|-
| January 13, 2001
| colspan="2" | Green
| Anacostia
| {{wmata|Branch Avenue}}
| 5
| 6.5
|-
| November 20, 2004
| colspan="2" | Red
| colspan="2" | Infill station ({{wmata|NoMa–Gallaudet U}})
| 1
| -
|-
| December 18, 2004
| Blue
|Blue and Silver
| Addison Road
| {{wmata|Largo Town Center}}
| 2
| 3.2
|-
| July 26, 2014
| Silver (service created)
| Silver
| {{wmata|East Falls Church}}
| {{wmata|Wiehle–Reston East}}
| 5
| 11.6
|-
| November 15, 2022
| colspan="2" | Silver
| Wiehle–Reston East
| {{wmata|Ashburn}}
| 6
| 11.4
|-
| May 19, 2023
| colspan="2" | Blue and Yellow
| colspan="2" | Infill station ({{wmata|Potomac Yard}})
| 1
| -

|}