Seabrook is a town in Rockingham County, New Hampshire, United States. The population was 7,979 at the 2000 census. Located at the southern end of the coast of New Hampshire on the border with Massachusetts, Seabrook is noted as the location of the Seabrook Nuclear Power Station, the most recent nuclear power plant constructed in the United States. Seabrook is colloquially known as "The Brook," and the people who live there are referred to as "Brookers."