Fostoria is a city in Clay County, Iowa, United States.

[3] According to the United States Census Bureau, the city has a total area of 0.47 square miles (1.22 km2), all land.

There were 106 housing units at an average density of 260.9 per square mile (100.7/km2).

There were 94 housing units at an average density of 200.0 per square mile (77.2/km2).

20.7% of all households were made up of individuals, and 6.9% had someone living alone who was 65 years of age or older.

There were 97 housing units at an average density of 204.0 per square mile (78.8/km2).

20.0% of all households were made up of individuals, and 6.3% had someone living alone who was 65 years of age or older.

None of the families and 2.2% of the population were living below the poverty line, including no under eighteens and 12.0% of those over 64.

A small part of Fostoria is within the Spencer Community School District.