Londonderry township is located in Ross County, Ohio. Londonderry township has a 2026 population of 717. Londonderry township is currently growing at a rate of 0.42% annually and its population has increased by 1.56% 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.
Data after 2023 is projected based on recent change
Overall: 48.6 years
Female: 59.2 years
Male: 38.5 years
There are 338 adults, (65 of whom are seniors) in Londonderry township.
Female: 198 (44.4%)
Male: 248 (55.6%)
The racial composition of Londonderry township includes 99.78% White, and smaller percentages for Two or more races and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 445 | 99.78% |
| Two or more races | 1 | 0.22% |