Prior to the European powers colonizing Long Island, the area was inhabited by the MatinecockNative Americans.<ref name=":81" /> The European powers began to settle in and colonize the area during the 17th century; many of the area's first settlers from Europe were Dutch and English.<ref name=":81" />
In the 19th century, many wealthy individuals from New York City began to erect large country estates on Long Island's Gold Coast – including many in what is now the Village of Roslyn Harbor.<ref name=":81" /><ref>Template:Cite web</ref>
Roslyn Harbor incorporated as a village on October 17, 1931, as a result of the residents wishing to make their own zoning codes and other laws under the Municipal Home Rule Law.<ref name=":81">Template:Cite book</ref><ref name=":0">Template:Cite news</ref> At the time, the majority of Roslyn Harbor consisted of a few large estates.<ref name=":81" /><ref name=":0" />
The "Roslyn" part of Roslyn Harbor's name is shared with Roslyn, Roslyn Estates, and Roslyn Heights, and ultimately can be traced back to when the name "Roslyn" was chosen for that village, as the geography in Roslyn reminded officials of the geography of Roslin, Scotland.<ref name=":81" /> The "Harbor" part of the name reflects its proximity to Hempstead Harbor.<ref name=":81" /> The name was chosen during the incorporation movement.<ref name=":81" />
An earlier proposed name was Roslyn Hills, due to its hilly location, proximity to Roslyn, and because the Long Island Rail Road advertised the area as the "Switzerland of Long Island."<ref name=":81" /> The "Hills" was substituted with "Harbor" after concerns were expressed that it could be mixed up with Roslyn Heights.<ref name=":81" />
Prior to incorporating, the area was generally considered part of Roslyn (which wouldn't incorporate until 1932), and before that name was chosen for the area in 1844, it was known as Hempstead Harbor.<ref name=":81" />
Template:As of, there were 1,023 people, 356 households, and 301 families residing in the village.<ref name="GR2" /> The population density was Template:Convert. There were 367 housing units at an average density of Template:Convert. The racial makeup of the village was 91.59% White, 1.27% African American, 4.99% Asian, 1.08% from other races, and 1.08% from two or more races. Hispanic or Latino of any race were 3.32% of the population.
There were 356 households, out of which 34.6% had children under the age of 18 living with them, 77.2% were married couples living together, 5.3% had a female householder with no husband present, and 15.4% were non-families. 12.6% of all households were made up of individuals, and 6.2% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.12.
In the village, the population was spread out, with 23.5% under the age of 18, 4.3% from 18 to 24, 21.3% from 25 to 44, 31.5% from 45 to 64, and 19.5% who were 65 years of age or older. The median age was 46 years. For every 100 females, there were 95.6 males. For every 100 females age 18 and over, there were 90.0 males.
The median income for a household in the village was $128,295, and the median income for a family was $150,000. Males had a median income of $100,000 versus $41,071 for females. The per capita income for the village was $69,778. About 1.3% of families and 2.5% of the population were below the poverty line, including 3.3% of those under age 18 and 2.3% of those age 65 or over.
Template:As of, the Mayor of Roslyn Harbor is Sandy K. Quentzel, the Deputy Mayor is Joshua Kopelowitz, and the Trustees are James Friscia, Jasun Fiorentino, and Abby Kurlender.<ref>Template:Cite web</ref>
Roslyn Harbor is served by both the Roslyn Union Free School District and the North Shore Central School District.<ref name=":122"/> Students who reside in Roslyn Harbor and attend public schools go to one of these districts depending on where they live in the village.<ref name=":122"/>
Roslyn Harbor is served by Roslyn's library district and by the Gold Coast Library District.<ref name=":122"/> The boundaries of the library districts correspond with the school district boundaries; Roslyn's library district (the Bryant Library) serves the part of Roslyn Harbor in the Roslyn Union Free School District and the Gold Coast Library District serves the part of Roslyn Harbor in the North Shore Central School District.<ref name=":122"/>
Roslyn Harbor is primarily located within the boundaries of (and is thus served by) the Roslyn Water District.<ref name=":122"/> Smaller areas of the village are located within the boundaries of (and are thus served by) the Glenwood and Jericho Water Districts.<ref name=":122"/>
Brian Koppelman – Filmmaker, essayist, podcaster, TV series creator, former music business executive, and record producer.<ref>Template:Cite news</ref>
