Washington, IL was founded in 1825. There are currently 13,167 people living in Washington, according to the 2004 special census. Washington is located 12 miles east of Peoria, the "River City" of central Illinois. Washington offers a choice of stable neighborhoods that residents can be proud of...older and established, stately and historic, or new and modern. Washington is the marketplace for the surrounding area, and prides itself on having all the conveniences of a self-supporting community. The City’s historic Downtown Square is a foundation of our exceptional quality of life.