
Marmarth
- County:
- Slope County
- County Seat:
- No
- Area (mi²):
- 2.578
- State:
- North Dakota
Marmarth is a city located in Slope County, North Dakota. Marmarth has a 2025 population of 92. Marmarth is currently declining at a rate of -1.08% annually and its population has decreased by -7.07% since the most recent census, which recorded a population of 99 in 2020.
The average household income in Marmarth is $77,122 with a poverty rate of 5.68%. The median age in Marmarth is 57.8 years: 59.5 years for males, and 49.9 years for females.