Marine on St. Croix or Marine on Saint Croix[2] (/məˈriːn ɒn ˈseɪnt ˈkrɔɪ/ mə-REEN on SAYNT KROY)[4] is a city in Washington County, Minnesota, United States.

[9] Minnesota State Highway 95 serves as a main route in the community.

29.8% of all households were made up of individuals, and 11.6% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 98.34% White, 0.33% African American, 0.17% Asian, and 1.16% from two or more races.

23.6% of all households were made up of individuals, and 7.1% had someone living alone who was 65 years of age or older.

[6] The sawmill was built by Illinois lumbermen David Hone and Lewis Judd, who saw the opportunity to cut the St. Croix River valley's abundant white pine.

[12] The mill began operation in August 1839, making it the first commercial sawmill within Minnesota.

[6] A 450-acre (180 ha) historic district in Marine on St. Croix was listed on the National Register of Historic Places in 1974 for having state-level significance in the themes of architecture, commerce, exploration/settlement, and industry.

[15] It was nominated as the birthplace of Minnesota's lumber industry and for its representation of two separate but interdependent waves of immigration that created the town.

60 buildings and three sites of ruins were identified as the contributing properties to the historic district in 1974.