Fitchburg is a medium-sized city located in the state of Massachusetts. With a population of 41,502 people and 11 associated neighborhoods, Fitchburg is the 36th largest community in Massachusetts. Fitchburg has a large stock of pre-World War II architecture, making it one of the older and more historic cities in the country.

A relatively large number of people in Fitchburg telecommute to their jobs. Overall, about 8.73% of the workforce works from home. While this may seem like a small number, as a fraction of the total workforce it ranks among the highest in the country. 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 citizens of Fitchburg are slightly better educated than the national average of 21.84% for all cities and towns, with 23.68% of adults in Fitchburg having a bachelor's degree or advanced degree.

The per capita income in Fitchburg in 2018 was $33,436, which is low income relative to Massachusetts, and middle income relative to the rest of the US. This equates to an annual income of $133,744 for a family of four. However, Fitchburg contains both very wealthy and poor people as well.

Fitchburg is an extremely ethnically-diverse city. The people who call Fitchburg home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Fitchburg residents report their race to be White, followed by Black or African-American. Fitchburg also has a sizeable Hispanic population (people of Hispanic origin can be of any race). People of Hispanic or Latino origin account for 30.56% of the city’s residents. Important ancestries of people in Fitchburg include Irish, French, Italian, French Canadian, and English.

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