Birtsell township
- County:
- Foster County
- County Seat:
- No
- Area (mi²):
- 35.747
- State:
- North Dakota
Birtsell township is located in Foster County, North Dakota. Birtsell township has a 2026 population of 91. Birtsell township is currently declining at a rate of -1.09% annually and its population has decreased by 0% since the most recent census, which recorded a population of 91 in 2020.