Sedol 18160 W Gages Lake Rd, Gages Lake, IL60030 Sedol is the Special Education District of Lake County that has been servicing the Lake County area for more than 50…More years. Its main office has been located on Gages Lake Road for more than 16 years. It services more than 1,200 full-time students in its six different school buildings located throughout Lake County. The 800 employees consists of, but are not limited to, teachers, physical therapists, speech/language therapists, nurses, and psychologists. Check out its website for more detailed information about its services.