Riverhead is a town within Suffolk County, New York, on the north shore of Long Island. As of the 2010 census, the population was 33,506. The town rests on the mouth of the Peconic River, from which it derives its name. Since 1727, Riverhead has been the county seat of Suffolk County. The smaller hamlet of Riverhead lies within it, and is the town’s principal economic center. The town is 166 miles (267 km) southwest of Boston via the Orient Point-New London Ferry, and is 76 miles (123 km) northeast of New York City.
The north town line is delineated by Long Island Sound with Connecticut on the opposite shore. The east town line is the border of the town of Southold. The town is partly on the North Fork of the county. The eastern terminus of the Long Island Expressway is in Riverhead.
According to the United States Census Bureau, the town has a total area of 201.3 square miles (521 km), of which 67.4 square miles (175 km) is land and 133.9 square miles (347 km), or 66.53%, is water.
As of the census of 2010, there were 33,506 people and 15,424 households residing in the town. The population density was 497.1 people per square mile (192.0/km²).
As of the census of 2000, There were 10,749 households out of which 28.1% had children under the age of 18 living with them, 54.0% were married couples living together, 10.3% had a female householder with no husband present, and 32.2% were non-families. 26.4% of all households were made up of individuals and 14.1% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.01.
As of the census of 2010, in the town the population was spread out with 20.4% under the age of 18, 2.2% from 18 to 20, 6.1% from 20 to 24, 10.5% from 25 to 34, 20.6% from 35 to 49, 21.8% from 49 to 64, and 19.4% who were 65 years of age or older. For every 100 females, there were 99.0 males.
As of the census of 2000, the median income for a household in the town was $52,195, and the median income for a family was $60,939. Males had a median income of $40,855 versus $32,288 for females. The per capita income for the town was $24,647. About 15.8% of families and 17.9% of the population were below the poverty line, including 20.7% of those under age 18 and 7.4% of those age 65 or over.
Riverhead New York neighborhoods include: Aquebogue, Herricks Lane, Hoccabuck Park, Kennys, Longneck, Ludlam, Main Rd-Shady Tree, Riverhead, Rolling Woods, Sandpiper, Willow Ponds on the Sound