Buckeye is a city in Hardin County, Iowa, United States. The population was 86 at the time of the 2020 census. Buckeye got its start circa 19…Buckeye is a city in Hardin County, Iowa, United States. The population was 86 at the time of the 2020 census. Buckeye got its start circa 1901, following construction of the railroad through that territory.