The station opened on July 17, 1918, as
Mott Haven Avenue station, as a southbound extension of the Jerome Avenue Line into the Upper East Side extension of the
IRT Lexington Avenue Line. As such, it is the newest station on the line. The segment north of
Kingsbridge Road to
Woodlawn opened three months earlier. The city government took over the IRT's operations on June 12, 1940. The station was built with tablets displaying "Mott Haven" and others displaying "138th Street–Mott Haven." The ones with "138th Street" were painted over with text reading "138th Street–Grand Concourse", but all were eventually covered with black plates reading "138 Street" in white
Standard (Akzidenz-Grotesk) lettering. During the station's renovation in the late 2010s, most of the tablets were restored. In 1956, the
New York City Transit Authority announced plans to add
fluorescent lighting to the station. The fluorescent lights were installed along the edges of the station's platforms. The walls of both platforms retain their original mosaic trim line with "MH" tablets on it – a relic of the station's former name. The platforms were extended at both ends in the 1950s; the design of these platform extensions are in contrast from the original portions, as they have a blue trim with "138TH ST" in white lettering. Blue i-beam columns run along both platforms at regular intervals with alternating ones having the standard black number plates in white lettering. In 2011, the advocacy group
Transportation Alternatives took a poll of subway riders to vote for the smelliest subway station in the system, as part of its "rank the stank" contest. This station was ranked the smelliest of four nominated stations, receiving 35% of the votes. From November 18, 2019, to March 30, 2020, the northbound platform was temporarily closed for renovations. From April 27, 2020, to July 27, 2020, the southbound platform was temporarily closed for renovations. ==Station layout==