|Founded by||Jacob M. Rhode|
|Elevation||679 ft (207 m)|
|Time zone||EST (UTC-5)|
|• Summer (DST)||EDT (UTC-4)|
|GNIS feature ID||446200|
Winthrop was platted on March 3, 1884 by farmer Jacob Morgan Rhode (d. February 8, 1919); the name probably comes from a personal name. A north/south line of the Chicago and Eastern Illinois Railroad known as the "Coal Road" served the town in the late 19th and early 20th centuries. Operated after 1922 as the Chicago, Attica and Southern Railroad, it deteriorated in the 1930s and was scrapped around 1945. Few traces of the route remain.
Winthrop is located about 1.5 miles (2.4 km) east of Indiana State Road 55 and about 6.5 miles (10.5 km) north of the county seat of Williamsport, at an elevation of approximately 680 feet. The West Fork of Kickapoo Creek flows to the west and south of town.
- "US Board on Geographic Names". United States Geological Survey. October 25, 2007. Retrieved 2016-07-10.
- "USGS detail on Winthrop, Indiana". Retrieved 2007-09-30.
- A History of Warren County, Indiana (175th Anniversary Edition). Warren County Historical Society. 2002.
- Baker, Ronald L.; Carmony, Marvin (1975). Indiana Place Names. Bloomington, Indiana: Indiana University Press. p. 182.
- Sulzer, Elmer G. (1998). "The Old Coal Road". Ghost Railroads of Indiana. Indiana University Press. ISBN 0-253-33483-7.