Charleroi is a very small borough located in the state of Pennsylvania. With a population of 4,174 people and two associated neighborhoods, Charleroi is the 367th largest community in Pennsylvania. Charleroi has an unusually large stock of pre-World War II architecture, making it one of the older and more historic boroughs.

Telecommuters are a relatively large percentage of the workforce: 7.30% of people work from home. While this number may seem small overall, as a fraction of the total workforce it is high relative to the nation. 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.

The percentage of adults in Charleroi who are college-educated is close to the national average for all communities of 21.84%: 17.18% of the adults in Charleroi have a bachelor's degree or advanced degree.

The per capita income in Charleroi in 2022 was $24,564, which is low income relative to Pennsylvania and the nation. This equates to an annual income of $98,256 for a family of four. However, Charleroi contains both very wealthy and poor people as well.

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

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