Otho is a city in Webster County, Iowa, United States.

[3] According to the United States Census Bureau, the city has a total area of 0.46 square miles (1.19 km2), all land.

There were 245 housing units at an average density of 553.4 per square mile (213.7/km2).

Hispanic or Latino persons of any race comprised 3.5% of the population.

There were 260 housing units at an average density of 565.2 per square mile (218.2/km2).

29.1% of all households were made up of individuals, and 12.7% had someone living alone who was 65 years of age or older.

There were 245 housing units at an average density of 549.7 per square mile (212.2/km2).

30.0% of all households were made up of individuals, and 12.9% had someone living alone who was 65 years of age or older.

Otho is within the Fort Dodge Community School District.