Cylinder is a city in Palo Alto County, Iowa, United States.

[4] The original railway depot was named after nearby Cylinder Creek, which may have received its name after early settlers dropped an engine into the mud and never recovered it.

[4][5] Professional wrestler Danny Havoc was born in Cylinder, and started wrestling in his family's barn with friends after school.

[6] According to the United States Census Bureau, the city has a total area of 0.07 square miles (0.18 km2), all land.

There were 41 housing units at an average density of 437.7 per square mile (169.0/km2).

There were 44 housing units at an average density of 628.6 per square mile (242.7/km2).

33.3% of all households were made up of individuals, and 18% had someone living alone who was 65 years of age or older.

26.7% of all households were made up of individuals, and 13.3% had someone living alone who was 65 years of age or older.

There were 21.2% of families and 31.9% of the population living below the poverty line, including 62.5% of under eighteens and none of those over 64.