Plymouth is a somewhat small borough located in the state of Pennsylvania. With a population of 5,751 people and four associated neighborhoods, Plymouth is the 252nd largest community in Pennsylvania. Plymouth has a large stock of pre-World War II architecture, making it one of the older and more historic boroughs in the country.

The percentage of people in Plymouth with college degrees is quite a bit lower than the national average for cities and towns of 21.84%: just 12.41% of people over 25 have a bachelor's degree or advanced degree.

The per capita income in Plymouth in 2022 was $25,228, 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 $100,912 for a family of four. However, Plymouth contains both very wealthy and poor people as well.

Plymouth is a very ethnically-diverse borough. The people who call Plymouth home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Plymouth residents report their race to be White, followed by Black or African-American. Plymouth also has a sizeable Hispanic population (people of Hispanic origin can be of any race). People of Hispanic or Latino origin account for 12.23% of the borough’s residents. Important ancestries of people in Plymouth include Polish, German, Irish, Italian, and Welsh.

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