
Ada
- County:
- Hardin County
- County Seat:
- No
- Area (mi²):
- 2.134
- State:
- Ohio
Ada is a village located in Hardin County, Ohio. Ada has a 2025 population of 5,280. Ada is currently declining at a rate of -0.21% annually and its population has decreased by -1.01% since the most recent census, which recorded a population of 5,334 in 2020.
The average household income in Ada is $70,662 with a poverty rate of 26.38%. The median age in Ada is 22.2 years: 22.3 years for males, and 22.2 years for females.