(10 ILCS 91/10.21)
    Sec. 10.21. Representative District No. 21. Representative District No. 21 is comprised of:
 
District: 21
Cook County
    Tract: 300500
        Blockgroup: 1
            Block 1006
            Block 1007
            Block 1008
            Block 1009
            Block 1010
            Block 1011
            Block 1012
            Block 1013
        Blockgroup: 2
            Block 2000
            Block 2001
            Block 2002
            Block 2003
            Block 2004
            Block 2005
            Block 2006
            Block 2007
    Tract: 300600
        Blockgroup: 1
            Block 1009
            Block 1010
            Block 1011
            Block 1012
            Block 1014
            Block 1015
            Block 1016
            Block 1017
            Block 1018
            Block 1019
            Block 1020
        Blockgroup: 2
            Block 2000
            Block 2001
            Block 2002
            Block 2003
            Block 2004
            Block 2005
            Block 2006
            Block 2007
    Tract: 300700
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            Block 1009
            Block 1010
            Block 1011
            Block 1012
            Block 1013
            Block 1014
            Block 1015
            Block 1016
            Block 1017
            Block 1018
            Block 1019
            Block 1020
            Block 1021
            Block 1022
        Blockgroup: 3
    Tract: 300800
    Tract: 300900
    Tract: 301100
    Tract: 301200
    Tract: 301801
        Blockgroup: 2
            Block 2037
    Tract: 301802
        Blockgroup: 1
            Block 1001
        Blockgroup: 2
            Block 2000
            Block 2006
            Block 2007
            Block 2008
            Block 2009
            Block 2016
    Tract: 560100
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            Block 1008
            Block 1009
            Block 1010
            Block 1011
            Block 1012
            Block 1013
            Block 1014
            Block 1015
            Block 1016
            Block 1020
            Block 1021
            Block 1022
    Tract: 560200
        Blockgroup: 1
            Block 1000
    Tract: 560900
        Blockgroup: 3
            Block 3002
            Block 3003
            Block 3004
            Block 3005
            Block 3006
            Block 3007
            Block 3008
            Block 3009
            Block 3010
            Block 3011
            Block 3012
            Block 3013
            Block 3014
            Block 3015
            Block 3016
            Block 3017
            Block 3018
            Block 3019
            Block 3020
            Block 3021
        Blockgroup: 4
        Blockgroup: 5
        Blockgroup: 6
    Tract: 561000
        Blockgroup: 3
            Block 3002
            Block 3003
            Block 3004
            Block 3005
            Block 3006
            Block 3007
            Block 3008
            Block 3009
            Block 3010
            Block 3011
            Block 3022
        Blockgroup: 4
            Block 4000
            Block 4001
            Block 4002
            Block 4003
            Block 4004
            Block 4005
            Block 4006
            Block 4007
            Block 4008
        Blockgroup: 5
            Block 5000
            Block 5001
            Block 5002
            Block 5003
            Block 5004
            Block 5005
            Block 5006
            Block 5007
            Block 5008
            Block 5009
            Block 5010
            Block 5011
            Block 5012
            Block 5013
        Blockgroup: 6
            Block 6000
            Block 6001
            Block 6002
            Block 6003
            Block 6004
            Block 6005
            Block 6006
            Block 6007
            Block 6008
            Block 6009
            Block 6010
            Block 6011
            Block 6012
    Tract: 570100
        Blockgroup: 1
            Block 1000
            Block 1002
    Tract: 570200
        Blockgroup: 1
            Block 1000
    Tract: 580100
        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 2019
            Block 2020
            Block 2021
            Block 2025
            Block 2026
            Block 2027
            Block 2028
            Block 2033
    Tract: 580200
    Tract: 580300
    Tract: 580501
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            Block 1008
            Block 1009
            Block 1011
            Block 1012
            Block 1013
            Block 1014
            Block 1015
            Block 1016
        Blockgroup: 2
        Blockgroup: 3
        Blockgroup: 4
    Tract: 580502
        Blockgroup: 2
            Block 2000
            Block 2001
        Blockgroup: 3
            Block 3000
            Block 3001
            Block 3002
            Block 3003
            Block 3004
            Block 3005
            Block 3006
            Block 3007
            Block 3008
            Block 3009
            Block 3010
            Block 3011
            Block 3012
            Block 3013
            Block 3014
            Block 3015
            Block 3016
            Block 3017
            Block 3018
            Block 3019
            Block 3020
            Block 3021
            Block 3022
            Block 3023
            Block 3024
            Block 3031
    Tract: 580600
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            Block 1008
        Blockgroup: 2
            Block 2015
        Blockgroup: 3
            Block 3002
            Block 3003
            Block 3004
            Block 3005
            Block 3006
            Block 3007
            Block 3008
            Block 3009
            Block 3010
            Block 3011
            Block 3012
            Block 3013
            Block 3014
            Block 3015
            Block 3016
        Blockgroup: 4
            Block 4001
            Block 4008
            Block 4009
            Block 4010
            Block 4011
            Block 4012
            Block 4013
    Tract: 814200
        Blockgroup: 2
            Block 2009
            Block 2010
            Block 2011
            Block 2017
            Block 2018
            Block 2019
            Block 2020
    Tract: 814300
        Blockgroup: 2
            Block 2015
            Block 2029
            Block 2030
            Block 2031
            Block 2032
            Block 2033
            Block 2034
            Block 2035
            Block 2036
            Block 2037
            Block 2038
            Block 2039
            Block 2040
            Block 2041
            Block 2042
            Block 2043
            Block 2044
            Block 2045
            Block 2046
    Tract: 814400
        Blockgroup: 1
        Blockgroup: 2
        Blockgroup: 3
            Block 3000
            Block 3001
            Block 3002
            Block 3003
            Block 3004
            Block 3005
            Block 3006
            Block 3007
            Block 3008
            Block 3009
            Block 3010
            Block 3011
            Block 3012
            Block 3013
            Block 3014
            Block 3015
            Block 3016
            Block 3023
            Block 3024
            Block 3025
            Block 3026
        Blockgroup: 4
            Block 4013
            Block 4014
            Block 4015
            Block 4016
            Block 4017
            Block 4018
            Block 4019
            Block 4020
            Block 4021
            Block 4022
    Tract: 814500
        Blockgroup: 3
            Block 3028
            Block 3029
    Tract: 815500
        Blockgroup: 7
            Block 7025
    Tract: 815701
        Blockgroup: 4
            Block 4006
            Block 4007
            Block 4008
            Block 4009
            Block 4010
            Block 4011
            Block 4012
            Block 4013
            Block 4014
            Block 4015
            Block 4016
            Block 4017
    Tract: 815702
        Blockgroup: 2
            Block 2006
            Block 2007
            Block 2008
            Block 2009
            Block 2010
            Block 2014
        Blockgroup: 3
        Blockgroup: 4
            Block 4007
            Block 4008
            Block 4009
            Block 4010
            Block 4011
            Block 4014
    Tract: 819100
    Tract: 819200
    Tract: 820202
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            Block 1008
            Block 1009
            Block 1010
            Block 1011
            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 1027
            Block 1030
            Block 1031
            Block 1033
            Block 1034
            Block 1035
            Block 1043
            Block 1044
            Block 1045
            Block 1046
            Block 1047
            Block 1048
            Block 1049
            Block 1050
            Block 1051
            Block 1052
            Block 1053
            Block 1054
            Block 1055
            Block 1056
            Block 1057
            Block 1058
            Block 1059
            Block 1060
            Block 1061
            Block 1062
            Block 1063
            Block 1064
            Block 1065
            Block 1066
            Block 1067
            Block 1068
            Block 1069
            Block 1070
            Block 1071
            Block 1072
            Block 1073
            Block 1074
            Block 1075
            Block 1076
            Block 1077
            Block 1078
            Block 1079
            Block 1080
            Block 1081
            Block 1082
            Block 1083
            Block 1084
            Block 1085
            Block 1086
            Block 1087
            Block 1088
            Block 1089
            Block 1090
            Block 1091
            Block 1092
            Block 1093
            Block 1094
            Block 1095
            Block 1096
            Block 1097
            Block 1098
            Block 1099
            Block 1100
            Block 1101
            Block 1102
            Block 1103
            Block 1104
            Block 1105
            Block 1106
            Block 1107
            Block 1108
            Block 1109
            Block 1110
            Block 1111
            Block 1112
            Block 1133
            Block 1143
            Block 1144
            Block 1146
            Block 1147
            Block 1148
            Block 1188
            Block 1189
            Block 1190
            Block 1191
            Block 1192
            Block 1193
            Block 1194
            Block 1195
            Block 1196
            Block 1197
            Block 1198
            Block 1199
            Block 1200
            Block 1236
            Block 1237
            Block 1251
            Block 1252
            Block 1253
            Block 1254
    Tract: 820300
    Tract: 820400
    Tract: 820501
        Blockgroup: 1
            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 1041
            Block 1042
            Block 1043
            Block 1044
            Block 1045
            Block 1046
            Block 1047
            Block 1048
            Block 1049
    Tract: 820502
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            Block 1008
            Block 1009
            Block 1010
            Block 1041
    Tract: 820700
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            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 1040
            Block 1041
            Block 1042
            Block 1043
            Block 1044
            Block 1045
            Block 1046
            Block 1047
            Block 1048
            Block 1049
            Block 1050
            Block 1051
            Block 1052
            Block 1053
            Block 1054
            Block 1055
            Block 1056
            Block 1057
            Block 1058
            Block 1059
            Block 1060
            Block 1061
            Block 1062
            Block 1063
            Block 1064
            Block 1065
            Block 1066
            Block 1067
            Block 1068
            Block 1069
        Blockgroup: 2
        Blockgroup: 3
        Blockgroup: 4
            Block 4004
            Block 4005
            Block 4010
            Block 4011
            Block 4012
            Block 4013
            Block 4014
            Block 4015
            Block 4016
            Block 4017
            Block 4018
            Block 4019
            Block 4020
            Block 4021
            Block 4022
            Block 4023
            Block 4024
            Block 4025
            Block 4026
            Block 4027
            Block 4028
            Block 4029
            Block 4030
            Block 4031
            Block 4032
            Block 4033
            Block 4034
            Block 4035
            Block 4036
            Block 4037
            Block 4038
            Block 4039
    Tract: 820800
        Blockgroup: 3
            Block 3000
            Block 3001
            Block 3002
            Block 3003
            Block 3004
            Block 3005
            Block 3006
            Block 3007
            Block 3008
            Block 3009
            Block 3010
            Block 3011
            Block 3012
            Block 3013
            Block 3014
            Block 3015
            Block 3016
            Block 3017
            Block 3018
            Block 3019
            Block 3020
            Block 3021
            Block 3022
            Block 3023
            Block 3024
            Block 3025
            Block 3026
            Block 3027
            Block 3028
            Block 3029
            Block 3030
            Block 3031
            Block 3032
            Block 3033
            Block 3034
            Block 3035
            Block 3036
            Block 3037
            Block 3038
            Block 3039
            Block 3040
            Block 3041
            Block 3042
            Block 3043
            Block 3044
            Block 3045
            Block 3046
            Block 3047
            Block 3048
            Block 3049
            Block 3050
            Block 3051
            Block 3052
            Block 3053
            Block 3054
            Block 3055
            Block 3058
            Block 3059
            Block 3060
            Block 3061
            Block 3062
            Block 3063
            Block 3064
            Block 3065
            Block 3066
            Block 3067
            Block 3068
            Block 3069
            Block 3070
            Block 3071
            Block 3072
            Block 3073
            Block 3074
            Block 3075
            Block 3076
            Block 3077
            Block 3078
            Block 3079
    Tract: 830500
        Blockgroup: 1
            Block 1004
            Block 1005
            Block 1006
            Block 1007
            Block 1008
            Block 1009
            Block 1010
            Block 1011
            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
        Blockgroup: 2
            Block 2000
            Block 2001
            Block 2002
            Block 2003
            Block 2004
            Block 2005
            Block 2006
            Block 2008
            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
        Blockgroup: 3
    Tract: 840300
        Blockgroup: 1
            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
    Tract: 840700
        Blockgroup: 1
        Blockgroup: 2
        Blockgroup: 3
            Block 3008
            Block 3009
            Block 3010
            Block 3011
            Block 3012
            Block 3013
            Block 3014
            Block 3019
            Block 3020
            Block 3021
            Block 3022
    Tract: 840800
        Blockgroup: 1
            Block 1000
            Block 1001
            Block 1002
            Block 1003
            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
        Blockgroup: 2
            Block 2000
            Block 2001
            Block 2002
            Block 2003
            Block 2004
            Block 2005
            Block 2006
            Block 2009
            Block 2010
            Block 2011
            Block 2012
            Block 2013
    Tract: 841300
        Blockgroup: 2
            Block 2019
            Block 2020
            Block 2021
            Block 2022
            Block 2023
            Block 2025
            Block 2026
    Tract: 842800
        Blockgroup: 1
            Block 1003
        Blockgroup: 2
            Block 2000
            Block 2001
            Block 2002
            Block 2003
        Blockgroup: 5
            Block 5000
            Block 5001
    Tract: 843500
(Source: P.A. 97-6, eff. 6-3-11.)