Pioneer is an unincorporated community in Humboldt County, Iowa, United States.

[4] According to the United States Census Bureau, the city has a total area of 0.06 square miles (0.16 km2), all land.

There were 5 housing units at an average density of 60.7 per square mile (23.4/km2).

12.5% of all households were made up of individuals, and 12.5% had someone living alone who was 65 years of age or older.

30.0% of all households were made up of individuals, and 20.0% had someone living alone who was 65 years of age or older.

There are 28.6% of families living below the poverty line and 50.0% of the population, including 100.0% of under eighteens and none of those over 64.

At the time of discontinuance, Pioneer had a mayor and three city council members, which met monthly.

Though it has lowered its tax rate, city coffers turned over to the county at discontinuance were at "about $150,000".

As of 2020, the system had three residential customers and the Pro Cooperative grain elevator.