Milo is a city in Warren County, Iowa, United States. The population was 778 at the time of the 2020 census. It is part of the Des Moines–Wes…Milo is a city in Warren County, Iowa, United States. The population was 778 at the time of the 2020 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area. Milo had its start in the year 1878 by the building of the railroad through Belmont Township.