Orrstown is a tiny borough located in the state of Pennsylvania. With a population of 213 people and two associated neighborhoods, Orrstown is the 1083rd largest community in Pennsylvania. Orrstown has an unusually large stock of pre-World War II architecture, making it one of the older and more historic boroughs.

The citizens of Orrstown have a very low rate of college education: just 6.61% of people over 25 have a bachelor's degree or advanced degree, compared to a national average of 21.84% for all cities.

The per capita income in Orrstown in 2018 was $28,199, which is lower middle income relative to Pennsylvania and the nation. This equates to an annual income of $112,796 for a family of four. However, Orrstown contains both very wealthy and poor people as well.

The people who call Orrstown home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Orrstown residents report their race to be White. Important ancestries of people in Orrstown include German, Polish, Swedish, Irish, and English.

The most common language spoken in Orrstown is English. Other important languages spoken here include Polish and Italian.