Will County Illinois (Historic Districts) has 11 places on the National Register of Historic Places including 2 places of National significance and 2 places of Statewide significance. Significant places include Brandon Road Lock and Dam Historic District, Lockport Lock, Dam and Power House Historic District, Illinois State Penitentiary-Joliet Historic District and Lockport Historic District and Downtown Joliet Historic District.
Some of the country's most noteable architects helped create the Will County places including Walter Mickle Smith, Frederick L. Barrett, Charlotte Strong and James Weese. Prominent architectural styles found in Will Country are Late Victorian, Queen Anne and Classical Revival.