About This Place
Winthrop is a city in Buchanan County, Iowa, United States. The population was 772 at the 2000 census.
Winthrop is located at 42°28′21″N 91°44′9″W / 42.4725°N 91.73583°W / 42.4725; -91.73583 (42.472419, -91.735713).
According to the United States Census Bureau, the city has a total area of 0.6 square miles (1.5 km²), all of it land.