Back to Calendar Overview GIS Day at Cook County Event Type: In-person Event Location: 69 W Washington St., 22nd Floor, Chicago, IL 60602 When: December 01, 2017 09:00am - 12:00pm <p>Cook </p> Cook County Celebrates Geographic Information Systems (GIS) Day Share Map Locate 41.8830252, -87.6299116 Related Agencies and Services Geographic Information Systems (GIS)