Henderson is a city in Mills County, Iowa, United States. The population was 144 at the time of the 2020 census. No buildings existed where t…Henderson is a city in Mills County, Iowa, United States. The population was 144 at the time of the 2020 census. No buildings existed where the community lies in 1875. A community had formed by February 1877 as records show residents were forming a Church of Christ. The community was original named Potter. Workers for railroad stayed local farmer Dave Henderson's yard and named the place Henderson Crossing; it was later shorted to Henderson. Henderson was platted in 1880.