Adelphi
- County:
- Ross County
- County Seat:
- No
- Area (mi²):
- 0.274
- State:
- Ohio
Adelphi is a village located in Ross County, Ohio. Adelphi has a 2026 population of 311. Adelphi is currently declining at a rate of -0.96% annually and its population has decreased by -1.89% since the most recent census, which recorded a population of 317 in 2020.
The median household income in Adelphi is $39,107 with a poverty rate of 26.11%. The median age in Adelphi is 41 years: 33.3 years for males, and 46.6 years for females. For every 100 females there are 110.7 males.