St. Olaf is a large village in Clayton County, Iowa, United States.

[4] Swiss Valley has a large cheese packaging plant in St. Olaf.

[6] According to the United States Census Bureau, the city has a total area of 0.24 square miles (0.62 km2), all land.

There were 47 housing units at an average density of 194.9 per square mile (75.2/km2).

There were 48 housing units at an average density of 200.0 per square mile (77.2/km2).

18.6% of all households were made up of individuals, and 9.3% had someone living alone who was 65 years of age or older.

There were 54 housing units at an average density of 218.7 per square mile (84.4/km2).

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

There were 2.5% of families and 8.1% of the population living below the poverty line, including 5.4% of under eighteens and 36.4% of those over 64.