Fonda is a city in Pocahontas County, Iowa, United States. The population was 636 at the time of the 2020 census.
The city of Fonda was originally called Marvin. Marvin, however, was deemed too similar to Manson, Iowa and due to mail being mixed up, town officials changed the name to Fonda in 1874. The nearest municipality sharing the name, "Fonda", is Fonda, New York.
Fonda is located at (42.582819, -94.845810).
According to the United States Census Bureau, the city has a total area of , all land.
The town is located at the western edge of the Des Moines Lobe, the most recently glaciated section of Iowa. The Des Moines Lobe is part of the prairie pothole region of the Midwest. The topography is irregular in its gently rolling terrain. Wetlands, glacial erratics, concentric bands of ridges, and large flat areas characterize the land surrounding Fonda. In its natural state, the land is poorly drained, although humans have added an extensive n