Sunbury is a somewhat small city located in the state of Pennsylvania. With a population of 9,587 people and four associated neighborhoods, Sunbury is the 116th largest community in Pennsylvania. Sunbury has an unusually large stock of pre-World War II architecture, making it one of the older and more historic cities.

The population of Sunbury has a very low overall level of education: only 9.04% of people over 25 hold a 4-year college degree or higher.

The per capita income in Sunbury in 2022 was $24,586, 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 $98,344 for a family of four. However, Sunbury contains both very wealthy and poor people as well.

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

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