The southwestern peninsula is known as Amity Harbor and is served by the Amityville Post Office.
The central peninsula is known as Copiague Harbor and is served by the Copiague Post Office.
The southeastern peninsula is known as Venice and is served by the Lindenhurst Post Office.
Demographics for the CDP
As of the census of 2010, there were 22,993 people and 7,535 households, with 3.04 persons per household. The population density was 7,185.3 per square mile. There were 7,919 housing units, of which 82.0% were owner-occupied. 4.8% of housing units were vacant and 28.0% of occupied housing units were occupied by renters. The racial makeup of the CDP was 83.5% White, 7.6% African American, 0.3% Native American, 2.2% Asian, 0.0% Pacific Islander, 13.0% some other race, and 3.5% from two or more races. Hispanic or Latino of any race were 32.7% of the population. The CDP was 57.3% non-Hispanic White. There were 7,535 households, out of which 29.2% had children under the age of 18 living with them, 49.2% were headed by married couples living together, 14.9% had a female householder with no husband present, and 28.4% were non-families. 21.4% of all households were made up of individuals, and 8.9% were someone living alone who was 65 years of age or older. The average household size was 3.04 and the average family size was 3.44. In the CDP, the population was spread out, with 21.2% under the age of 18, 9.2% from 18 to 24, 29.6% from 25 to 44, 28.1% from 45 to 64, and 11.7% who were 65 years of age or older. The median age was 38.4 years. For the period 2009–2011, it was estimated that 94.9% of the population had lived in the same house 1 year and over. 29.2% of the population were foreign-born, and 34.8% of residents at least 5 years old spoke a language other than English at home. Between 2009 and 2011, 84.9% of residents at least 25 years old had graduated from high school, and 20.9% of residents at least 25 years old had a bachelor's degree or higher. The mean travel time to work for workers aged 16 and over was 25.1 minutes. For the period 2009–2011, the median annual income for a household in the CDP was $74,065. The per capita income for the CDP was $29,768. 7.8% of the population were below the poverty line.
Public schools
Most of Copiague is served by the Copiague Union Free School District, which also serves most of North Amityville, a small portion of North Lindenhurst, and a very small portion of East Farmingdale. However, a portion of Copiague, west of Bayview Avenue and north of Dixon Avenue, is in the Amityville Union Free School District. As of the 2010-2011 school year, the Copiague Union Free School District had 4,720 students. The district operates six schools:
