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 2026 population of 652. Millville is currently growing at a rate of 1.09% annually and its population has increased by 2.35% since the most recent census, which recorded a population of 637 in 2020.
The median household income in Millville is $75,625 with a poverty rate of 7.13%. The median age in Millville is 50.9 years: 46.4 years for males, and 53.6 years for females. For every 100 females there are 113.1 males.