Marble Rock
- County:
- Floyd County
- County Seat:
- No
- Area (mi²):
- 0.832
- State:
- Iowa
Marble Rock is a city located in Floyd County, Iowa. Marble Rock has a 2026 population of 258. Marble Rock is currently declining at a rate of -1.53% annually and its population has decreased by -4.09% since the most recent census, which recorded a population of 269 in 2020.
The median household income in Marble Rock is $65,625 with a poverty rate of 6.28%. The median age in Marble Rock is 51.5 years: 52.1 years for males, and 51.3 years for females. For every 100 females there are 103.2 males.