Pomeroy is a city in Calhoun County, Iowa, United States.

[4] On July 6, 1893, Pomeroy was struck by a tornado that was later estimated to be F5 on the Fujita scale.

With a damage path 500 yards (460 m) wide and 55 miles (89 km) long, the tornado destroyed about 80% of the homes in Pomeroy.

[7] According to the United States Census Bureau, the city has a total area of 2.04 square miles (5.28 km2), all land.

[8] Pomeroy lies within the western side of Manson crater, an impact structure buried by glacial till and outwash.

There were 301 housing units at an average density of 147.0 per square mile (56.7/km2).

There were 350 housing units at an average density of 171.6 per square mile (66.3/km2).

35.0% of all households were made up of individuals, and 20.3% had someone living alone who was 65 years of age or older.

There were 356 housing units at an average density of 174.2 per square mile (67.3/km2).

39.8% of all households were made up of individuals, and 22.0% had someone living alone who was 65 years of age or older.