| A Route | B Route | |||
| A01 | Metro Center | B01 | Gallery Place | |
| A02 | Farragut North | B02 | Judiciary Square | |
| A03 | Dupont Circle | B03 | Union Station | |
| A04 | Woodley Park | B35 | NoMa–Gallaudet U | |
| A05 | Cleveland Park | B99 | Brentwood Yard | |
| A06 | Van Ness–UDC | B04 | Rhode Island Avenue | |
| A07 | Tenleytown–AU | B05 | Brookland–CUA | |
| A08 | Friendship Heights | B06 | Fort Totten | |
| A09 | Bethesda | B07 | Takoma | |
| A10 | Medical Center | B08 | Silver Spring | |
| A11 | Grosvenor–Strathmore | B09 | Forest Glen | |
| A12 | White Flint | B10 | Wheaton | |
| A13 | Twinbrook | B11 | Glenmont | |
| A14 | Rockville | B98 | Glenmont Yard | |
| A97 | Hungerford | |||
| A15 | Shady Grove | |||
| A99 | Shady Grove Yard | |||
| C Route | D Route | |||
| C01 | Metro Center | D01 | Federal Triangle | |
| C02 | McPherson Square | D02 | Smithsonian | |
| C03 | Farragut West | D03 | L'Enfant Plaza | |
| C04 | Foggy Bottom – GWU | D04 | Federal Center SW | |
| C05 | Rosslyn | D05 | Capitol South | |
| C06 | Arlington Cemetery | D06 | Eastern Market | |
| C07 | Pentagon | D07 | Potomac Avenue | |
| C08 | Pentagon City | D08 | Stadium–Armory | |
| C09 | Crystal City | D98 | D & G Junction | |
| C10 | National Airport | D09 | Minnesota Avenue | |
| C11 | Potomac Yard | D10 | Deanwood | |
| C12 | Braddock Road | D11 | Cheverly | |
| C13 | King Street | D12 | Landover | |
| C97 | C & J Junction | D13 | New Carrollton | |
| C14 | Eisenhower Avenue | D99 | New Carrollton Yard | |
| C15 | Huntington | |||
| E Route | F Route | |||
| E01 | Mount Vernon Square | F01 | Gallery Place | |
| E02 | Shaw | F02 | Archives | |
| E03 | U Street | F03 | L'Enfant Plaza | |
| E04 | Columbia Heights | F04 | Waterfront | |
| E05 | Georgia Avenue–Petworth | F05 | Navy Yard | |
| E06 | Fort Totten | F06 | Anacostia | |
| E07 | West Hyattsville | F07 | Congress Heights | |
| E08 | Prince George's Plaza | F08 | Southern Avenue | |
| E09 | College Park | F09 | Naylor Road | |
| E10 | Greenbelt | F10 | Suitland | |
| E99 | Greenbelt Yard | F11 | Branch Avenue | |
| F99 | Branch Avenue Yard | |||
| G Route | J Route | |||
| G01 | Benning Road | C98 | Alexandria Yard Lead | |
| G02 | Capitol Heights | C99 | Alexandria Yard | |
| G03 | Addison Road | J01 | Quaker Lane | |
| G04 | Morgan Boulevard | J02 | Van Dorn Street | |
| G05 | Largo Town Center | J97 | Farrington Avenue | |
| G98 | Largo Town Yard | J98 | Roso Street | |
| J03 | Franconia–Springfield | |||
| K Route | N Route | |||
| K01 | Court House | N91 | Pinefield | |
| K02 | Clarendon | N92 | Baldwin Drice | |
| K03 | Virginia Square–GMU | N01 | McLean | |
| K04 | Ballston–MU | N02 | Tysons Corner | |
| K05 | East Falls Church | N03 | Greensboro | |
| K98 | K & J Junction | N04 | Spring Hill | |
| K06 | West Falls Church | N05 | Wolf Trap | |
| K99 | West Falls Church Yard | N93 | Chatham Ford Road | |
| K07 | Dunn Loring | N94 | Hunter Mill | |
| K08 | Vienna | N95 | Sunset Hill | |
| N06 | Wiehle–Reston East | |||
| N07 | Reston Town Center | |||
| N08 | Herndon | |||
| N09 | Innovation Center | |||
| N96 | Horsepin Run | |||
| N10 | Dulles International Airport | |||
| N97 | Autopilot Drive | |||
| N98 | Dulles Yard Lead | |||
| N99 | Dulles Yard | |||
| N11 | Loudoun Gateway | |||
| N12 | Ashburn | |||
| Italic = Descending numbers from 98 are maineline segments with no stations (99 and in one case 98 are assigned to yards), ascending numbers from 01 wher no station exists are location for future infill stations. | ||||