Ackworth is a city in Warren County, Iowa, United States. The population was 115 at the 2020 census. Ackworth was laid out in 1874. The com…Ackworth is a city in Warren County, Iowa, United States. The population was 115 at the 2020 census. Ackworth was laid out in 1874. The community most likely was named after the Ackworth School, in England. In 1878, the Chicago, Burlington and Quincy Railroad was extended to the town. Ackworth was incorporated in 1881.