Pioneer is an unincorporated community in Humboldt County, Iowa, United States. The population was 4 at the time of the 2020 census, and ele…Pioneer is an unincorporated community in Humboldt County, Iowa, United States. The population was 4 at the time of the 2020 census, and elected to unincorporate as a municipality in 2020. Pioneer is located at 42°39′16″N 94°23′27″W / 42.65444°N 94.39083°W.