Fort Dodge is a city in and the county seat of Webster County, Iowa, United States, along the Des Moines River. The population was 24,8…Fort Dodge is a city in and the county seat of Webster County, Iowa, United States, along the Des Moines River. The population was 24,871 in the 2020 census, a decrease from 25,136 in 2000. Fort Dodge is a major commercial center for North Central and Northwest Iowa. It is located on U.S. Routes 20 and 169.