Marion is a small residential community on the shores of Buzzards Bay. Although small in size, Marion has extensive coastline which includes the beautiful Sippican Harbor, a popular site for pleasure boating, fishing, swimming, and other recreational activities. Marion's village area captures the essence of New England charm, with its white picket fences and tree-lined streets.

Marion was originally settled in the 1600s as the village of Sippican, part of the town of Rochester. It was incorporated in the 1850s as the town of Marion. Today Marion has a stable year-round population with a moderate summertime increase. The small town character, blended with the flavor and benefits of a seacoast community with lovely residential neighborhoods and modern conveniences, makes Marion an ideal town for year-round living.
Marion is part of the Old Rochester Regional School District, which it shares with neighboring Rochester and Mattapoisett.

Marion is bordered on the southwest by Mattapoisett, on the northwest by Rochester, and on the northeast by Wareham.