Winthrop is a city located in Buchanan County Iowa. With a 2020 population of 839, it is the 324th largest city in Iowa and the 11068th largest city in the United States . Winthrop is currently declining at a rate of -0.59% annually and its population has decreased by -1.29% since the most recent census, which recorded a population of 850 in 2010. Winthrop reached it's highest population of in . Spanning over 1 miles, Winthrop has a population density of 1,061 people per square mile.
The average household income in Winthrop is $70,076 with a poverty rate of 8.10%. The median rental costs in recent years comes to $700 per month, and the median house value is $103,700. The median age in Winthrop is 44.6 years, 39.9 years for males, and 46.9 years for females.