Marne
- County:
- Cass County
- County Seat:
- No
- Area (mi²):
- 0.561
- State:
- Iowa
Marne is a city located in Cass County, Iowa. Marne has a 2026 population of 109. Marne is currently declining at a rate of -0.91% annually but its population has increased by 0.93% since the most recent census, which recorded a population of 108 in 2020.
The median household income in Marne is $61,875 with a poverty rate of 5.1%. The median age in Marne is 42.7 years: 47.5 years for males, and 42.2 years for females. For every 100 females there are 92.2 males.