Centralia is a medium-sized city located in the state of Washington. With a population of 18,773 people and six associated neighborhoods, Centralia is the 63rd largest community in Washington.

The percentage of adults in Centralia who are college-educated is close to the national average for all communities of 21.84%: 17.09% of the adults in Centralia have a bachelor's degree or advanced degree.

The per capita income in Centralia in 2022 was $27,744, which is low income relative to Washington, and lower middle income relative to the rest of the US. This equates to an annual income of $110,976 for a family of four. However, Centralia contains both very wealthy and poor people as well.

Centralia is a very ethnically-diverse city. The people who call Centralia home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Centralia residents report their race to be White, followed by Asian. Centralia also has a sizeable Hispanic population (people of Hispanic origin can be of any race). People of Hispanic or Latino origin account for 17.78% of the city’s residents. Important ancestries of people in Centralia include German, Irish, English, French, and Swedish.

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