
Castine
- County:
- Darke County
- County Seat:
- No
- Area (mi²):
- 0.076
- State:
- Ohio
Castine is a village located in Darke County, Ohio. Castine has a 2025 population of 106. Castine is currently declining at a rate of 0% annually and its population has decreased by -1.85% since the most recent census, which recorded a population of 108 in 2020.
The average household income in Castine is $63,565 with a poverty rate of 20.78%. The median age in Castine is 36.5 years: 35.6 years for males, and 46.3 years for females.