Oak Park is located immediately west of the city of Chicago. The boundary between the two municipalities is Austin Boulevard on the east side of Oak Park and North Avenue/Illinois Route 64 on the village's north side. Oak Park borders Cicero along its southern border, Roosevelt Road/Illinois Route 38, from Austin to Lombard; and Berwyn from Lombard to Harlem Avenue. Harlem/Illinois Route 43 serves as its western border, where between Roosevelt and South Boulevard, it borders Forest Park and between North Boulevard and North Avenue to the west it borders River Forest.