Springfield and south, use ISP Districts 9, 18 then 11 (near St. Louis)
http://www.radioreference.com/modules.php?name=RR&aid=819
Sangamon County
158.82000 KSI628 BM 225.7 PL F-1 E911: Fire/Rescue Dispatch / ESDA FM
155.53500 158.97000 KSC460 RM 146.2 PL F-1 Sheriff: Dispatch / Rural Units FM
155.53500 KSC460 M 146.2 PL F-2 Sheriff: Car-to-Car (Simplex) FM
155.05500 WNAH639 M 146.2 PL F-3 I-REACH -- Statewide Interagency Mutual Aid (146.2 on tx only) FM
154.86000 KSC460 BM 146.2 PL F-4 Sheriff: Animal Control FM
155.65500 KSC460 BM 146.2 PL F-5 Sheriff: Unit-to-Unit FM
Springfield Public Safety TRS (Can hear for a long distance)
http://www.radioreference.com/modules.php?name=TRSDB&sid=598
Christian County (close)
154.14500 WPDZ876 BM CSQ Fire/EMS Dispatch FM
155.70000 159.06000 KSA961 RM 127.3 PL Sheriff: Dispatch FM
Taylorville
154.08500 156.09000 WPTS351 RM DCS 311 Police Dispatch FM
Montgomery County
911 154.325
151.32500 159.25500 KNIA485 RBM DCS 351 Sheriff: Dispatch FM
Litchfield (Milepost 51) (sit in median)
156.16500 KSD393 BM 210.7 PL Dispatch "High Band" FM
460.22500 465.22500 KSD393 RM 127.3 PL F-2 Tactical / Car-to-Car FM
Macoupin County (Will only drive through about 3 miles, but worth listening too)
158.20500 159.63000 WPWB994 RM DCS 047 Main E911: Fire / EMS Dispatch "Countywide Repeater" (@ Fairgrounds) FM
159.09000 155.91000 WPFS699 BM DCS 351 F-1 Sheriff: Deputy Dispatch FM
154.78500 159.10500 WPFS699 BM DCS 351 Sheriff: "Local Government" - Rural Police Dispatch FM
Mt Olive (north of mm41)
155.58000 WPEM829 BM DCS 351 Police FM
Staunton (patrols interstate around milemarker 41)
155.62500 WPEH410 BM 141.3 PL Police FM
Madison County
154.43000 WNZI271 BM 167.9 PL FireNet E911: Fire Dispatch FM
Madison County Sheriff (most ops are MDTs)
155.59500 KSB221 BM 100.0 PL F-1 Sheriff: Dispatch FM
155.04000 KCX387 BM 100.0 PL F-3 Sheriff: Rural Police Dispatch "A" / Animal Control FM
158.85000 154.77000 KSB221 RM 100.0 PL F-4 Sheriff: Car-to-Car FM
Edwardsville
154.17500 WPGM753 RM 162.2 PL Fire Dispatch (PL mobile only) "KDD998" FM
453.97500 458.97500 KNHN539 RM 203.5 PL Police: Dispatch FM
Glen Carbon
460.35000 465.35000 WQCQ499 RM DCS 023 F-2 Police: Primary [WNQA348e, STA] FM
Troy
154.25000 KFA468 BM 94.8 PL Fire Dispatch / Paging FM
153.74000 153.93500 KLU488 RMF 203.5 PL 1 Police: Dispatch FM
Collinsville
154.35500 159.77500 WPII568 RM 91.5 PL Fire: Dispatch FM
460.10000 465.10000 KSA903 RM DSC 026 1 Police: Dispatch FM
Granite City
151.34000 153.77000 WNPG778 RM 123.0 PL Fire Dispatch FM
153.84500 155.85000 KSA217 RM 100.0 PL Police Dispatch FM
St. Clair County
154.19000 KSF817 BM CSQ FireMain Fire Dispatch (Multiple Bases) FM
154.74000 158.97000 WNXK676 RM 141.3 PL F-1 Sheriff: Deputy Dispatch FM
155.41500 WNXK676 BM 141.3 PL F-2 Sheriff: Rural PDs - Alorton, Belleville (mobiles), Centreville, Dupo, Fairmont City, Freeburg, Lebanon, Mascoutah, Marissa, FM
155.41500 WNXK676 BM 141.3 PL F-2 Sheriff: Rural PDs - Milldstadt, New Athens, Shiloh, Smithton FM
155.76000 KSG935 BM 100.0 PL F-3 Sheriff: Rural PDs - Cahokia, Dupo, East Carondelet, Fairmont City, Freeburg FM
155.76000 KSG935 BM 100.0 PL F-3 Sheriff: Rural PDs - Marissa, Mascoutah, Milldstadt, Shiloh, Summerville FM
158.83500 KSG935 BM 100.0 PL F-4 Sheriff: Rural PDs - Brooklyn, Venice / ESDA FM
East St. Louis (ugh)
460.37500 465.37500 KUQ659 RBM 156.7 PL Police Dispatch [Expired] FM
460.57500 465.57500 RM DCS 624 Fire Dispatch (was 156.7 PL) [Expired] FM
That'll do you until St. Louis from Springfield IL