Mercersburg is a very small borough located in the state of Pennsylvania. With a population of 1,496 people and two associated neighborhoods, Mercersburg is the 722nd largest community in Pennsylvania. Mercersburg has a large stock of pre-World War II architecture, making it one of the older and more historic boroughs in the country.

Mercersburg is a small borough, and as such doesn't have a public transit system that people use to get to and from their jobs every day.

The percentage of adults in Mercersburg who are college-educated is close to the national average for all communities of 21.84%: 19.24% of the adults in Mercersburg have a bachelor's degree or advanced degree.

The per capita income in Mercersburg in 2022 was $40,321, which is upper middle income relative to Pennsylvania and the nation. This equates to an annual income of $161,284 for a family of four. However, Mercersburg contains both very wealthy and poor people as well.

The people who call Mercersburg home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Mercersburg residents report their race to be White, followed by Black or African-American. Important ancestries of people in Mercersburg include German, Irish, English, Polish, and Scots-Irish.

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