Armagh
- County:
- Indiana County
- County Seat:
- No
- Area (mi²):
- 0.057
- State:
- Pennsylvania
Armagh is a borough located in Indiana County, Pennsylvania. Armagh has a 2026 population of 101. Armagh is currently declining at a rate of 0% annually and its population has decreased by -0.98% since the most recent census, which recorded a population of 102 in 2020.
The median household income in Armagh is $88,929 with a poverty rate of 1.94%. The median age in Armagh is 57.3 years: 55.9 years for males, and 58.5 years for females. For every 100 females there are 134.1 males.