St. Martin
- County:
- Brown County
- County Seat:
- No
- Area (mi²):
- 1.937
- State:
- Ohio
St. Martin is a CDP located in Brown County, Ohio Ohio. Unfortunately, the data for this location is currently limited or unavailable.
The median age in St. Martin is 55.4 years: 60.9 years for males, and 49.7 years for females. For every 100 females there are 70.5 males.