Londonderry township
- County:
- Ross County
- County Seat:
- No
- Area (mi²):
- 36.351
- State:
- Ohio
Londonderry township is located in Ross County, Ohio. Londonderry township has a 2026 population of 711. Londonderry township is currently growing at a rate of 0.42% annually and its population has increased by 0.71% since the most recent census, which recorded a population of 706 in 2020.
The median age in Londonderry township is 48.6 years: 38.5 years for males, and 59.2 years for females. For every 100 females there are 125.3 males.