Ollie is a city in Keokuk County, Iowa, United States. The population was 201 at the time of the 2020 census. Originally known as Hemingford, …Ollie is a city in Keokuk County, Iowa, United States. The population was 201 at the time of the 2020 census. Originally known as Hemingford, the town voted to change the name to Ollie in 1892. According to the United States Census Bureau, the city has a total area of 0.99 square miles, all of it land.