Hitterdal is a city in Clay County, Minnesota, United States. The population was 199 at the 2020 census. A post office called Hitterdal has been i…Hitterdal is a city in Clay County, Minnesota, United States. The population was 199 at the 2020 census. A post office called Hitterdal has been in operation since 1887. The city was named after Hitterdal, in Norway.