
Vandalia
- County:
- Montgomery County
- County Seat:
- No
- Area (mi²):
- 12.341
- State:
- Ohio
Vandalia is a city located in Montgomery County, Ohio. Vandalia has a 2025 population of 14,767. Vandalia is currently declining at a rate of -0.57% annually and its population has decreased by -2.81% since the most recent census, which recorded a population of 15,194 in 2020.
The average household income in Vandalia is $95,663 with a poverty rate of 8.77%. The median age in Vandalia is 40.9 years: 40 years for males, and 42.7 years for females.