All of the following territory constitutes the 42nd assembly district:

• Columbia County. That part of Columbia County consisting of all of the following:
  • The towns of Arlington, Columbus, Dekorra, Fountain Prairie, Hampden, Leeds, Lodi, Lowville, Otsego, Springvale, and West Point.
  • The villages of Arlington, Doylestown, Fall River, Poynette, and Rio.
  • The city of Lodi.
  • That part of the city of Columbus located in the county.
• Dane County. That part of Dane County consisting of all of the following:
  • The town of Vienna.
  • That part of the town of Burke comprising U.S. census tract 2402, blocks 1000, 1012, and 1013; and tract 2500, blocks 1000, 1012, 1014, 1015, 1026, 1028, 1043, and 1076; and tract 2602, blocks 1000, 1001, 1023, 1024, 1025, 1026, 4000, and 4001; and tract 11201, blocks 1000, 1001, 1002, 1056, 1057, 1061, 1062, 1063, 1064, 1065, 1069, 1070, 1072, 1074, 1076, 1077, 1079, 1080, 1081, 1083, 2010, 2015, 2058, 2059, 2060, 2061, and 2064; and tract 11404, blocks 4001, 4002, 4003, 4004, 4005, 4006, 4007, 4014, 4015, 4016, 4019, 4020, 4021, 4022, 4023, 4024, 4025, 4026, 4027, 4028, 4037, 4039, 4041, 4048, 4049, 4053, 4054, and 4057; and tract 11405, blocks 1018, 1020, 1023, 1024, 1026, 1027, 1028, 1029, 1030, 1031, 1046, 1047, and 1054.
  • The villages of Deforest and Windsor.
  • That part of the city of Madison comprising U.S. census tract 2500, blocks 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011, 1013, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023, 1024, 1025, 1027, 1029, 1030, 1031, 1032, 1033, 1061, 1062, 1063, 1070, 1071, 1072, 2006, 2007, and 2008; and tract 2602, blocks 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011, 1012, 1013, 1014, 1015, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1027, 1028, 1029, 1030, 1031, 1032, 1033, 1034, 1035, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 3000, 3001, 3002, 3003, 3004, 4002, 4003, 4004, 4005, 4006, 4007, 4008, 4009, 4010, 4011, 4012, 4013, 4014, 4015, and 4016; and tract 11201, blocks 1049, 1050, 1051, 1052, 1066, 1067, 1068, 1071, 1073, 1075, 1078, and 1082; and tract 11404, blocks 4038, 4040, 4050, 4051, 4052, and 4055; and tract 11405, blocks 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011, 1012, 1013, 1014, 1015, 1016, 1017, 1019, 1021, 1022, 1025, 1032, 1038, 1039, 1040, 1041, 1042, 1043, 1044, 1045, 1048, 1049, 1050, 1051, 1052, 1055, 1056, 1057, and 1058.
• Dodge County. That part of Dodge County consisting of that part of the city of Columbus located in the county.