Marshall is a U.S. city in Michigan. It is the county seat of Calhoun County. The population was 7,088 at the 2010 census. Marshall is best known for its cross-section of 19th- and early 20th-century architecture. It has been referred to by the keeper of the National Register of Historic Places as a "virtual textbook of 19th-Century American architecture." Its historic center is the Marshall Historic District, one of the nation's largest architecturally significant National Historic Landmark Districts. The Landmark has over 850 buildings, including the world-famous Honolulu House.