Le Roy is a city in Decatur County, Iowa, United States. The population was 15 in the 2010 census, an increase from 13 in the 2000 census.In the 2000 census, Le Roy had the distinction of being the second smallest populated incorporated city in Iowa, with the increase in the 2010 census of both Le Roy and Beaconsfield, Iowa (population 11 in 2000) they now share the title of being the smallest populated incorporated cities in Iowa.