[2] Located between Roslyn and Brookville, the Greenvale station is known as the Long Island Rail Road stop for the C.W.

[4] Until 1866, the community was known as "Cedar Swamp", and later known as "Bull's Head", until some point in the early 20th century; it has also been known historically as "North Roslyn".

[5][6][7] While many residential areas in the hamlet were developed prior to the Second World War, the 1940s and 1950s saw the development of the area adjacent to the Roslyn Cemetery and the Long Island Rail Road tracks (including Park Avenue and Wellington Road).

[6][12][13][14] Developed by Castagna Realty – the owners of the Americana Manhasset – and first proposed in 1977, the center's construction required a change in land use from residential to business & parking.

[15] According to the United States Census Bureau, the CDP has a total area of 0.3 square miles (0.78 km2), all land.

[17][18] According to the United States Geological Survey and the United States Environmental Protection Agency, Greenvale is located within the Hempstead Harbor Watershed, which itself is located within the larger Long Island Sound/Atlantic Ocean Watershed.

[24][28][31] Flower Hill is located entirely within New York's 3rd Congressional district, which as of April 2024 is represented in the United States Congress by Thomas R. Suozzi (D–Glen Cove).

[24][32] Like the rest of New York, Greenvale is represented in the United States Senate by Charles Schumer (D) and Kirsten Gillibrand (D).

[24] One state-owned road travels through (and directly serves) Greenvale: Northern Boulevard (New York State Route 25A).

[24] Greenvale is served by the n20H and n27 bus routes, which are operated by Nassau Inter-County Express (NICE).

[24] Trash collection services in Greenvale are provided by Meadow Carting, under contract to the Roslyn Garbage District.