The 100th district, located in parts of the Metro East, covers all or parts of Alsey, Batchtown, Baylis, Bluffs, Brighton, Brussels, Carrollton, Chapin, Chesterfield, Concord, Detroit, El Dara, Eldred, Exeter, Fidelity, Fieldon, Florence, Franklin, Glasgow, Godfrey, Grafton, Greenfield, Griggsville, Hamburg, Hardin, Hettick, Hillview, Hull, Jacksonville, Jerseyville, Kampsville, Kane, Kinderhook, Lynnville, Manchester, Meredosia, Milton, Modesto, Murrayville, Naples, Nebo, New Canton, New Salem, Otterville, Palmyra, Peal, Perry, Pittsfield, Pleasant Hill, Rockbridge, Roodhouse, Scottville, South Jacksonville, Time, Valley City, Waverly, White Hall, Wilmington, Winchester, and Woodson.