Avenue U is a local station on the BMT Sea Beach Line of the New York City Subway. Located at the intersection of Avenue U and West Seventh Street, it is served by the N train at all times. This station has four tracks and two side platforms. The two center express tracks are not normally used, but both are available for rerouted trains. The platforms are in an open cut. The concrete walls are painted beige and the columns are blue.
This station has two entrances, both of which are beige station houses at street-level between West Seventh and West Eighth Streets above the tracks and have a single staircase leading to each platform at either ends. The main exit at the south end has a turnstile bank and token booth and leads to Avenue U while the exit at the north end leads to Avenue T and is un-staffed, containing just HEET turnstiles and exit-only turnstiles. In 2005, the station was listed on the National Register of Historic Places.