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Mastic is located at 40°48'8" North, 72°50'38" West (40.802090, -72.843953) 1.
According to the United States Census Bureau, the CDP has a total area of 12.5 km˛ (4.8 mi˛). 11.6 km˛ (4.5 mi˛) of it is land and 0.9 km˛ (0.3 mi˛) of it is water. The total area is 7.05% water.
As of the census 2 of 2000, there are 15,436 people, 4,451 households, and 3,761 families residing in the CDP. The population density is 1,330.3/km˛ (3,445.1/mi˛). There are 4,732 housing units at an average density of 407.8/km˛ (1,056.1/mi˛). The racial makeup of the CDP is 85.26% White, 6.05% African American, 1.72% Native American, 1.12% Asian, 0.01% Pacific Islander, 3.59% from other races, and 2.25% from two or more races. 12.15% of the population are Hispanic or Latino of any race.
There are 4,451 households out of which 49.8% have children under the age of 18 living with them, 61.9% are married couplesMarriage is a relationship that plays a key role in the definition of many families. Precise definitions vary historically and between and within cultures, but it has been an important concept as a socially sanctioned bond between people who (usually) are living together, 16.8% have a female householder with no husband present, and 15.5% are non-families. 10.9% of all households are made up of individuals and 3.5% have someone living alone who is 65 years of age or older. The average household size is 3.45 and the average family size is 3.67.
In the CDP the population is spread out with 32.7% under the age of 18, 9.3% from 18 to 24, 32.5% from 25 to 44, 20.0% from 45 to 64, and 5.5% who are 65 years of age or older. The median age is 31 years. For every 100 females there are 99.0 males. For every 100 females age 18 and over, there are 96.3 males.
The median income for a household in the CDP is $53,657, and the median income for a family is $54,047. Males have a median income of $41,721 versus $28,468 for females. The per capita incomeThe per capita income for an area may be defined as the total personal income in an area, divided by the number of people in that area. A ranking of the top 10 countries, according to the 2004 CIA World Factbook (in US dollar) # Luxembourg $55,100 # Norwa for the CDP is $18,275. 13.0% of the population and 11.0% of families are below the poverty lineThe poverty line is the level of income below which one cannot afford to purchase all the resources one requires to live. People who have an income below the poverty line have no discretionary disposable income, by definition. The actual monetary value of. Out of the total population, 18.4% of those under the age of 18 and 4.3% of those 65 and older are living below the poverty line.
Suffolk County, New York Census-designated places in New York