Rochester is a very small borough located in the state of Pennsylvania. With a population of 3,382 people and two associated neighborhoods, Rochester is the 436th largest community in Pennsylvania. Much of the housing stock in Rochester was built prior to World War II, making it one of the older and more historic boroughs in the country.

The citizens of Rochester are slightly less educated than the national average of 21.84% for the average city or town: 16.97% of adults in Rochester have a bachelor's degree or advanced degree

The per capita income in Rochester in 2022 was $27,873, which is low income relative to Pennsylvania, and lower middle income relative to the rest of the US. This equates to an annual income of $111,492 for a family of four. However, Rochester contains both very wealthy and poor people as well.

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

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