(10 ILCS 77/10.12)
    Sec. 10.12. Congressional District No. 12. Congressional District No. 12 is comprised of:
 
District: 12
Alexander County
Franklin County
Jackson County
Jefferson County
Madison County
    Tract: 400101
    Tract: 400102
    Tract: 400200
    Tract: 400600
    Tract: 400700
    Tract: 400801
    Tract: 400802
    Tract: 400903
    Tract: 400904
    Tract: 400951
    Tract: 400952
    Tract: 401000
    Tract: 401100
    Tract: 401200
    Tract: 401300
    Tract: 401400
    Tract: 401500
    Tract: 401701
    Tract: 401721
    Tract: 401722
    Tract: 401800
    Tract: 401901
        Blockgroup: 1
        Blockgroup: 2
            Block 2000
            Block 2001
            Block 2002
            Block 2003
            Block 2004
            Block 2005
            Block 2006
            Block 2007
            Block 2008
            Block 2009
            Block 2010
            Block 2011
            Block 2012
            Block 2013
            Block 2014
            Block 2015
            Block 2016
            Block 2017
            Block 2018
            Block 2019
            Block 2020
            Block 2021
            Block 2022
            Block 2023
            Block 2024
            Block 2025
            Block 2026
            Block 2027
            Block 2028
            Block 2029
            Block 2032
            Block 2034
            Block 2035
            Block 2036
            Block 2037
            Block 2038
    Tract: 401903
    Tract: 401904
    Tract: 402000
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            Block 1008
            Block 1010
            Block 1012
            Block 1013
            Block 1014
            Block 1015
            Block 1016
            Block 1017
            Block 1018
            Block 1019
            Block 1020
            Block 1021
            Block 1022
            Block 1023
            Block 1024
            Block 1025
            Block 1026
            Block 1027
            Block 1028
            Block 1029
            Block 1030
        Blockgroup: 2
        Blockgroup: 3
        Blockgroup: 4
    Tract: 402100
    Tract: 402200
        Blockgroup: 1
        Blockgroup: 2
            Block 2000
            Block 2001
            Block 2002
            Block 2003
            Block 2004
            Block 2005
            Block 2006
            Block 2007
            Block 2008
            Block 2009
            Block 2010
            Block 2011
            Block 2012
            Block 2013
            Block 2014
            Block 2015
            Block 2017
            Block 2018
            Block 2019
            Block 2020
            Block 2021
            Block 2022
        Blockgroup: 3
    Tract: 402300
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            Block 1008
            Block 1009
            Block 1012
            Block 1013
            Block 1014
            Block 1015
            Block 1016
            Block 1017
            Block 1018
            Block 1019
            Block 1020
            Block 1021
            Block 1022
            Block 1023
            Block 1024
            Block 1025
            Block 1026
            Block 1027
            Block 1028
            Block 1029
            Block 1030
            Block 1031
            Block 1032
            Block 1033
            Block 1034
            Block 1035
            Block 1036
            Block 1037
            Block 1038
            Block 1039
            Block 1040
            Block 1041
            Block 1042
            Block 1043
            Block 1044
            Block 1045
            Block 1046
            Block 1047
        Blockgroup: 2
    Tract: 402400
    Tract: 402500
    Tract: 402600
    Tract: 402701
        Blockgroup: 3
            Block 3022
            Block 3023
            Block 3024
            Block 3027
            Block 3031
            Block 3032
            Block 3034
            Block 3035
            Block 3036
            Block 3037
            Block 3038
            Block 3039
            Block 3040
            Block 3041
            Block 3042
            Block 3043
            Block 3045
            Block 3046
            Block 3047
            Block 3048
            Block 3049
            Block 3050
            Block 3051
            Block 3052
            Block 3059
            Block 3062
            Block 3068
            Block 3071
            Block 3072
            Block 3073
            Block 3074
            Block 3075
            Block 3076
            Block 3077
            Block 3078
            Block 3080
            Block 3081
            Block 3083
            Block 3085
            Block 3088
            Block 3089
            Block 3090
            Block 3091
            Block 3092
            Block 3093
            Block 3094
        Blockgroup: 4
            Block 4013
            Block 4014
            Block 4015
    Tract: 402722
        Blockgroup: 1
            Block 1059
            Block 1061
    Tract: 402801
        Blockgroup: 1
            Block 1033
        Blockgroup: 2
            Block 2046
            Block 2047
            Block 2048
            Block 2054
            Block 2055
            Block 2056
            Block 2057
            Block 2058
            Block 2059
            Block 2060
            Block 2061
            Block 2062
            Block 2063
            Block 2064
            Block 2065
    Tract: 402802
        Blockgroup: 2
            Block 2080
            Block 2081
        Blockgroup: 5
            Block 5007
            Block 5008
            Block 5009
            Block 5010
            Block 5011
            Block 5012
            Block 5013
            Block 5015
            Block 5016
            Block 5017
            Block 5018
            Block 5019
            Block 5020
            Block 5021
            Block 5026
            Block 5027
    Tract: 402803
        Blockgroup: 1
            Block 1010
            Block 1011
            Block 1012
            Block 1013
            Block 1014
            Block 1015
            Block 1016
        Blockgroup: 2
            Block 2086
            Block 2115
    Tract: 403534
        Blockgroup: 2
            Block 2039
            Block 2040
            Block 2041
            Block 2046
    Tract: 404000
    Tract: 404100
Monroe County
Perry County
Pulaski County
Randolph County
St. Clair County
Union County
Williamson County
(Source: P.A. 97-14, eff. 6-24-11.)