Plymouth Southside Historic District is a national historic district located at Plymouth, Marshall County, Indiana. The district encompasses 91 contributing buildings, 2 contributing structures, and 1 contributing object in a predominantly residential section of Plymouth. It developed between about 1853 and 1953, and includes examples of Italianate, Greek Revival, Queen Anne, Colonial Revival, and Tudor Revival style architecture. Notable contributing resources include the John McFarlin, Jr., House (c. 1860), Trinity United Methodist Church (1926), Bible Baptist Church (1894), Felke Florist and Greenhouse (1922), John Soice Residence (c. 1875), Westervelt-Marble Residence (c. 1865, 1899), and Edwards-Gambel Residence (1856).[2]