Legend

to Sutphin–Archer–JFK Airport to 111th Street

Station service legend
Symbol	Description
	Stops all times except rush hours in the peak direction
	Stops rush hours in the peak direction only
	Stops all times

The 121st Street station is a skip-stop station on the elevated BMT Jamaica Line of the New York City Subway. Located at the intersection of 121st Street and Jamaica Avenue in Richmond Hill, Queens, it is served by the Z train during rush hours in the peak direction and the J train at all other times.

This station was opened on July 3, 1918, by the Brooklyn Union Elevated Railroad, an affiliate of the Brooklyn Rapid Transit Company.

During construction of the Archer Avenue Line, the Jamaica Avenue elevated line was cut back past 121st Street on April 15, 1985. The Q49 bus, which replaced Jamaica elevated service running from the line's previous terminal of Queens Boulevard to the line's original terminal at 168th Street, was extended to 121st Street. Until the opening of the Archer Avenue Line in 1988, J trains alternately terminated at 111th Street and 121st Street, with peak period headways to 121st Street being ten minutes. This temporary service pattern was originally slated to be in effect for six or seven months. Construction on the ramps to Archer Avenue was completed in November 1987, but since the tunnels were not ready for service until 1988, a double crossover east (railroad north) of the station was installed while the ramps were used for storage. The Archer Avenue Line opened on December 11, 1988, and service was extended from 121st Street to Jamaica Center–Parsons/Archer.

The Manhattan-bound platform closed for renovations on February 6, 2017, and reopened on December 22, 2017, delayed from the summer. The Jamaica Center-bound platform closed for renovations on February 12, 2018, and reopened on November 14, 2018, delayed from its planned reopening in the summer.

Platform level	Side platform
	Westbound local	← toward Broad Street (111th Street) ← AM rush toward Broad Street (104th Street) ← AM rush does not stop here
	Peak-direction express	No track or roadbed
	Eastbound local	→ toward Jamaica Center–Parsons/Archer (Sutphin Boulevard–Archer Avenue–JFK Airport) → → PM rush toward Jamaica Center–Parsons/Archer (Sutphin Boulevard–Archer Avenue–JFK Airport) → → PM rush does not stop here →
	Side platform
Mezzanine		Fare control, station agent, MetroCard and OMNY machines
Ground	Street Level	Entrance/exit

This elevated station has two tracks and two side platforms, with space for a center express track that was never added. The station has beige windscreens and green canopies. This is the easternmost station on the Jamaica Line, east of here, trains go underground to the BMT Archer Avenue Line.

There are two exits. The full-time exit is at the west (railroad south) end of the station. One staircase from each platform leads to the mezzanine beneath the tracks. Outside of fare control, a pair of staircases lead down to either side of Jamaica Avenue on the west side of 121st Street.

There is an additional unstaffed exit at the east (railroad north) end of the station leading to the west side of 123rd Street. This exit is split in half due to the closed-off station house beneath the tracks. A single staircase from each platform leads to a landing that contains a full-height HEET turnstile before the street stairs.

Wikimedia Commons has media related to 121st Street (BMT Jamaica Line).

• nycsubway.org – BMT Jamaica Line: 121st Street
• Station Reporter — J Train
• The Subway Nut — 121st Street Pictures Archived January 5, 2018, at the Wayback Machine
• 121st Street entrance from Google Maps Street View
• 123rd Street entrance from Google Maps Street View
• Platforms from Google Maps Street View