Glenwood Landing is a hamlet and census-designated place (CDP) in Nassau County, New York. The population was 3,948 at the time of the 2020 census.

Glenwood Landing is mainly within the Town of Oyster Bay but a small section in the southwest corner is in the Town of North Hempstead. It is a part of the North Shore School District. It is considered part of the greater Glen Cove area, which is anchored by the City of Glen Cove.

According to the United States Census Bureau, the CDP has a total area of 1.0 square mile (2.6 km), all land.

Historical population

Census	Pop.	Note	%±
2000	3,541		—
2010	3,379		−4.6%
2020	3,948		16.8%
U.S. Decennial Census

As of the 2010 census, there were 3,379 people residing within Glenwood Landing. the population was 92.9% White, 88.2% Non-Hispanic White, 0.8% Black or African American, 3.7% Asian, 1% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 6.1% of the population.

As of the census of 2000, there were 3,541 people, 1,262 households, and 1,009 families residing in the CDP. The population density was 3,595.6 inhabitants per square mile (1,388.3/km). There were 1,284 housing units at an average density of 1,303.8 per square mile (503.4/km). The racial makeup of the CDP was 95.37% White, 0.28% African American, 2.60% Asian, 0.59% from other races, and 1.16% from two or more races. Hispanic or Latino of any race were 3.33% of the population.

There were 1,262 households, out of which 37.6% had children under the age of 18 living with them, 67.1% were married couples living together, 9.5% had a female householder with no husband present, and 20.0% were non-families. 17.0% of all households were made up of individuals, and 8.3% had someone living alone who was 65 years of age or older. The average household size was 2.81 and the average family size was 3.17.

In the CDP, the population was spread out, with 26.2% under the age of 18, 4.7% from 18 to 24, 27.4% from 25 to 44, 25.4% from 45 to 64, and 16.2% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 87.4 males. For every 100 females age 18 and over, there were 86.8 males.

The median income for a household in the CDP was $78,341, and the median income for a family was $90,784. Males had a median income of $68,939 versus $35,833 for females. The per capita income for the CDP was $33,689. About 1.0% of families and 2.4% of the population were below the poverty line, including none of those under age 18 and 4.4% of those age 65 or over.

As Glenwood Landing is an unincorporated hamlet, it is directly governed by the Towns of North Hempstead and Oyster Bay.

The parts of Roslyn Harbor in the Town of North Hempstead are located in its 2nd council district, which as of March 2024 is represented on the North Hempstead Town Council by Edward Scott (R–Albertson).

Glenwood Landing is located in Nassau County's 11th Legislative district, which as of March 2024 is represented in the Nassau County Legislature by Delia DiRiggi-Whitton (D–Glen Cove).

Glenwood Landing is split between the New York State Assembly's 13th and 15th State Assembly districts, which as of March 2024 are represented by Charles D. Lavine (D–Glen Cove) and Jacob Ryan Blumencranz (R–Oyster Bay), respectively.

Glenwood Landing is located within the New York State Senate's 7th State Senate district, which as of March 2024 is represented in the New York State Senate by Jack M. Martins (R–Old Westbury).

Glenwood Landing is located within New York's 3rd congressional district, which as of March 2024 is represented in the United States Congress by Thomas R. Suozzi (D–Glen Cove).

Like the rest of New York, Roslyn Harbor is represented in the United States Senate by Charles Schumer (D) and Kirsten Gillibrand (D).