Merillon Avenue station was established in 1911 near the former Clowesville station, which was established in June 1837 by the
Brooklyn and Jamaica Railroad. It was the closest LIRR station to the old Queens County Courthouse (
Nassau County became a separate county in 1899, splitting off from Queens County) off
Jericho Turnpike. By 1845, it was used only when courts were in session. Though re-established as a station in 1911, the station house itself was not built until 1912.
1993 Shooting Station enhancements As part of the
Main Line third track project in the late 2010s and early 2020s, the Merillon Avenue station was extensively rebuilt and upgraded to accommodate full-length 12-car trains. As part of the project, platform B was relocated to allow for the construction of a third track. Canopies, benches, signage, and security cameras were installed. The station was made fully compliant with the
Americans with Disabilities Act of 1990, through the installation of elevators and ramps. The existing station building was demolished, and the land it formerly occupied was repurposed to allow for extra commuter parking spaces. Amenities such as Wi-Fi, USB charging stations, artwork, and digital information displays were also included in the renovation. In addition to the station renovations, the LIRR's electrical substation at the Merillon Avenue station was replaced to make way for the third track, and the train bridge over Nassau Boulevard was replaced with a new, three-track bridge with a clearance below of . ==Station layout==