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

The blockhouse from this fort still stands near its original location at the corner of Second and Park.

[citation needed] Peterson was platted in 1881 when the railroad was extended to that point.

According to the United States Census Bureau, the city has a total area of 0.31 square miles (0.80 km2), all land.

There were 186 housing units at an average density of 358.3 per square mile (138.3/km2).

Hispanic or Latino persons of any race comprised 2.5% of the population.

There were 196 housing units at an average density of 632.3 per square mile (244.1/km2).

37.2% of all households were made up of individuals, and 25% had someone living alone who was 65 years of age or older.

There were 200 housing units at an average density of 649.8 per square mile (250.9/km2).

37.6% of all households were made up of individuals, and 25.4% had someone living alone who was 65 years of age or older.