Castana is a city in Monona County, Iowa, United States.

[4] The name Castana was selected by an early settler who believed it to be a Latin word meaning "chestnuts".

[6] According to the United States Census Bureau, the city has a total area of 0.93 square miles (2.41 km2), all land.

There research is carried out in beef cattle, swine, forage and the effects of fertiliser on soya beans and corn.

42.6% of all households were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 98.31% White, 1.12% Native American and 0.56% Pacific Islander.

32.5% of all households were made up of individuals, and 14.3% had someone living alone who was 65 years of age or older.

About 20.4% of families and 25.0% of the population were below the poverty line, including 36.9% of those under the age of eighteen and 13.3% of those 65 or over.

[15] The community was originally a part of the Castana Consolidated Independent School District.

In 1897 a permanent $12,000, three story Castana Normal School building opened.

[17] The school district acquired a teacher's residence hall in 1920; that building also housed classes for several grades.

[16] In 1935 and 1936 the Castana Consolidated School, the final school building in Castana, was built by the Sioux City company Beuttler & Arnold, funded by a $36,818 Public Works Administration grant and a $45,000 bond.