St. Croix
- County:
- Hettinger County
- County Seat:
- No
- Area (mi²):
- 36.658
- State:
- North Dakota
St. Croix is located in Hettinger County, North Dakota. St. Croix has a 2025 population of 29 . St. Croix is currently declining at a rate of 0% annually and its population has decreased by -3.33% since the most recent census, which recorded a population of 30 in 2020.
The median age in St. Croix is 62.9 years: 0 years for males, and 0 years for females. For every 100 females there are 100.0 males.