Founded in 2011, the team made its debut in the Northeast-Atlantic Division of the National Premier Soccer League (NPSL), the fourth tier of the United States soccer league system, in 2012.

The Mariners began play in the Northeast-Atlantic Division of the National Premier Soccer League in 2012.

[1] Seacoast United Mariners was originally founded in 1986 as Costal Soccer Club.

There are teams that play at the premier and select level and offer U9-U18 boys and girls.

In 2018 Seacoast United became a part of the US Soccer Development Academy which is the most competitive league that the club has to offer.