St. Olaf
- County:
- Clayton County
- County Seat:
- No
- Area (mi²):
- 0.241
- State:
- Iowa
St. Olaf is a city located in Clayton County, Iowa. St. Olaf has a 2026 population of 102. St. Olaf is currently declining at a rate of -0.97% annually and its population has decreased by -1.92% since the most recent census, which recorded a population of 104 in 2020.
The median household income in St. Olaf is $98,125 with a poverty rate of 8.11%. The median age in St. Olaf is 51.5 years: 49 years for males, and 54.7 years for females. For every 100 females there are 137.5 males.