The area south of Zumbro Falls to the Wabasha–Olmsted County line along U.S. 63 was named South Troy. The name of Troy was changed to Zumbro Falls after 1860 because there was already a community named Troy in southeast Minnesota at Winona County.
The southern part of the territory between Zumbro Falls and the Wabasha–Olmsted County line, along U.S. 63, was referred to as South Troy. The name Troy was altered to Zumbro Falls after 1860 due to the presence of an existing Troy community in southeast Minnesota at Winona County.