It will, when the system gets built out there. So far there is only 1 site in Cook County and that one hasn't worked in a week. They are using it as close as Plainfield right now.
Give it a couple months and you will likely see a couple more sites come online in the greater Chicagoland area.
There is one more site in or around Cook County dont know the location of site 102
APCO P25 System BEE00-140 State of Illinoi Site 001-002 unnamed Qual 93%
LCN Frequency Pr Destination Party ID TID Calling Party CT 01-1934 774.09375 CC
01-1974 774.34375
01-2014 774.59375
01-2054 774.84375 01-2094 775.09375 CC
01-2134 775.34375
01-2174 775.59375