Peoria County Courthouse 324 Main Street Peoria, IL 61602 Telephone: (309) 672-6056 Fax: (309) 672-6054 Hearing Impaired Use: TDD# (800) 526-0844 Peoria County Government Peoria County Government has 1,000 employees serving under 9 Elected Officials and 10 senior managers, the latter reporting directly to the County Administrator. 18 County Board Members set policy for the organization and determine the County's annual work plan through an effective strategic planning process that reaffirms the County's vision and mission. Known as the Heart of Illinois, Peoria County is at the center of a multiple county region along the Illinois River midway between Chicago and St. Louis, with a population of 182,495.