New York State Route 110 (NY 110) is a major north–south state highway along the western border of Suffolk County, New York. It runs between the village of Amityville in the town of Babylon and Halesite in the town of Huntington. NY 110 comes close to the Nassau County line several times in the town of Babylon, which is only surpassed by NY 108 in distance to the county line for a state highway. Route description NY 110 begins at an intersection with NY 27A (Merrick Road) in the Suffolk County village of Amityville. Proceeding northward as Broadway, NY 110 crosses through downtown Amityville as a two-lane village street. Expanding to four lanes, the route intersects at-grade with County Route 12 (CR 12; Oak Street) before crossing under the Babylon Branch of the Long Island Rail Road, a block east of Amityville station. NY 110 continues north along Broadway, forking northwest at a junction with Albany Avenue. Passing Brunswick Hospital, the route intersects with the western terminus of CR 2 (Dixon Street) before entering a cloverleaf interchange with NY 27 (Sunrise Highway). NY 110 continues into North Amityville, becoming a four-lane boulevard through the center of the hamlet. The route crosses through several commercial districts in North Amityville, proceeding northwest towards the Nassau County line. Bending northward alongside the county line, NY 110 enters an interchange with the Southern State Parkway (exit 32S–N), where the route changes names to Broad Hollow Road. NY 110 then expands to six lanes, intersecting with CR 47 (Main Street / Great Neck Road). Bending northeast and away from the county line, NY 110 continues as a six-lane boulevard, crossing through the town of Babylon into East Farmingdale. Entering East Farmingdale, NY 110 crosses over the Central Branch of the Long Island Rail Road and enters a large grade-separated interchange with NY 109 (Farmingdale Road) just west of Republic Airport. NY 110 continues north through Babylon as a six-lane boulevard past the runway of Republic Airport, passing a small campus of Molloy College. Entering Airport Plaza, the route continues north into an intersection with the eastern terminus of the western segment of NY 24 (Conklin Street). NY 110 continues north along Broad Hollow Road, going underneath the Ronkonkoma Branch of the LIRR in between the Farmingdale and Pinelawn stops, then passing the campus of State University of New York at Farmingdale. Just north of the