Lacona is a city in Warren County, Iowa, United States. The population was 345 at the time of the 2020 census. It is part of the Des Moines …Lacona is a city in Warren County, Iowa, United States. The population was 345 at the time of the 2020 census. It is part of the Des Moines metropolitan area. Lacona was laid out in 1856. It was incorporated in 1881.