From the record
“The Ridgeland-Oak Park Historic District is a historic district in Oak Park, Illinois that was listed on the National Register of Historic Places in 1983. It includes 1558 contributing buildings over 539 acres (218 ha).”
Wikipedia article Ridgeland-Oak Park Historic District, CC BY-SA 4.0.
One of 621 National Register listings published here for Cook County · listed in 1983 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service




