[5] Orange Line service began on November 20, 1978 when the extension to New Carrollton opened.

[6][5] The Maryland Avenue entrance will be closed for about seven months beginning on May 9, 2022, for escalator replacement.

[7] L'Enfant Plaza was the setting of a 2007 Pulitzer Prize–winning article by Washington Post reporter Gene Weingarten where world-famous classical violinist Joshua Bell performed outside the station at rush hour disguised as a street musician.

[8] On January 12, 2015, smoke appeared in the station during the afternoon rush hour, causing one death.

[10] Richmond, Fredericksburg and Potomac Railroad local service used a station at 7th Street until at least the mid-1950s.

[12] Media related to L'Enfant Plaza (WMATA station) at Wikimedia Commons