
Millville
- County:
- Butler County
- County Seat:
- No
- Area (mi²):
- 0.583
- State:
- Ohio
Millville is a village located in Butler County, Ohio. Millville has a 2025 population of 635. Millville is currently declining at a rate of 0% annually and its population has increased by 0.16% since the most recent census, which recorded a population of 634 in 2020.
The average household income in Millville is $85,110 with a poverty rate of 4.54%. The median age in Millville is 48.5 years: 46.5 years for males, and 51 years for females.