Mercer is a very small borough located in the state of Pennsylvania. With a population of 1,933 people and three associated neighborhoods, Mercer is the 651st largest community in Pennsylvania. Mercer has a large stock of pre-World War II architecture, making it one of the older and more historic boroughs in the country.

One interesting thing about the economy is that relatively large numbers of people worked from their home: 10.35% of the workforce. While this number may seem small overall, as a fraction of the total workforce this is high compared to the rest of the county. These workers are often telecommuters who work in knowledge-based, white-collar professions. For example, Silicon Valley has large numbers of people who telecommute. Other at-home workers may be self-employed people who operate small businesses out of their homes.

As is often the case in a small borough, Mercer doesn't have a public transportation system that people use for their commute.

The percentage of adults in Mercer who are college-educated is close to the national average for all communities of 21.84%: 19.44% of the adults in Mercer have a bachelor's degree or advanced degree.

The per capita income in Mercer in 2022 was $34,677, which is middle income relative to Pennsylvania and the nation. This equates to an annual income of $138,708 for a family of four. However, Mercer contains both very wealthy and poor people as well.

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

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