Riverhead (town), New York in the context of "Suffolk County, New York"

Riverhead is a census-designated place (CDP) roughly corresponding to the hamlet by the same name located in the Town of Riverhead in Suffolk County, on Long Island, in New York, United States. The CDP's population was 13,299 at the 2010 census.

Situated at the mouth of the Peconic River, which empties into Peconic Bay where the North and South Forks of Long Island split, the town of Riverhead (of which the CDP is a part) is the official county seat of Suffolk County. In the 1960s, most of the county offices moved to the CDP of Hauppauge in the towns of Islip and Smithtown in the more populous western half of the county—a move which still spurs attempts for the town of Riverhead to lead the way for the secession of eastern Long Island towns to form Peconic County.

The North Fork is a 30-mile- (48 km) long peninsula in the northeast part of Suffolk County, New York, U.S., roughly parallel with a longer peninsula known as the South Fork, both on the East End of Long Island. Although the peninsula begins east of Riverhead hamlet, the term North Fork can also refer collectively to the towns of Riverhead and Southold in their entirety.

Beginning about 75 miles (120 kilometers) east of Manhattan, the North Fork is the easterly part of the North Shore of Long Island. Along with The Hamptons, the area is also part of Long Island's "East End".