Winthrop is a city located in the U.S. state of Arkansas. It is in Little River County and known to be a backdrop for the Winthrop Rockefeller election campaigns in the 1960s. It has a total area of 1.07 square miles at 33°49′51″N 94°21′16″W. The elevation is 335 feet above sea level. As of the 2010 census data, it had a total population of 192. The population density was 169.30/sq mi. Estimated per capita income in 2016 was $18,553. It has Zip code 71866.