Wadena is a city in Fayette County, Iowa, United States. The population was 209 at the time of the 2020 census. Wadena's electricity is supplied by Alliant Energy. Its land-line phone and DSL internet service is provided by Windstream. Cellular phone service is mainly provided by U.S. Cellular, as they have a tower located just east of town. Wadena is located in a valley and other cellular phone providers have spotty coverage in town. Wadena no longer has a cable television provider.