Oak Park is a village adjacent to the West Side of the city of Chicago in Cook County, Illinois, United States. It is the 29th largest municipality in Illinois as measured by population in the 2010 US Census.As of the 2010 United States Census the Village had a total population of 51,878.
In 1835, Joseph Kettlestrings, an immigrant from England, purchased 172 acres (70 ha) of land just west of Chicago for a farm and their home.More farmers and settlers had entered the area. Their land was called by several names locally, including Oak Ridge. When the first post office was set up, it could not use the name Oak Ridge as another post office was using that name in Illinois, so the post office chose Oak Park, and that name became the name for the settlement as it grew, and for the town when it incorporated in 1902. Oak Park attracts architecture buffs and others to view the many Frank Lloyd Wright designed homes found in the village, alongside homes reflecting other architectural styles. The largest collection of Wright-designed residential properties in the world is in Oak Park.A distinct focus on historic preservation of important architectural styles began in the 1970s and continues, with many buildings marked as historically significant, and so far, three historic districts defined. Other attractions include Ernest Hemingway's birthplace home and his boyhood home, the Ernest Hemingway Museum, the three Oak Park homes of writer and Tarzan creator Edgar Rice Burroughs, Wright's Unity Temple, Pleasant Home, and the Oak Park-River Forest Historical Society.