Seacoast United Mariners is an American soccer team based in Portland, Maine, United States. 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 team is operated by the Seacoast United Soccer Club, alongside division rivals, the Seacoast United Phantoms.

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Seacoast United Mariners

Full name	Seacoast United Mariners
Nickname(s)	Mariners
Founded	2011; 13 years ago (2011)
Stadium	Fitzpatrick Stadium, Portland, Maine
Capacity	6,000
Owner	Yard Dogs
League	National Premier Soccer League
2013	4th, Atlantic Division Playoffs: DNQ
Website	Club website
Home colors Away colors Third colors
Current season

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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.

Seacoast United Mariners has two regions Maine South and Maine North. 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.

• Seacoast United Phantoms (NPSL)
• Seacoast United Phantoms (PDL)