Illinois (all zip codes)
Indiana zip codes 46300-46699
Iowa counties Dubuque, Jackson, Clinton, Scott, Muscatine, Louisa, DesMoines and Lee
Missouri Counties East of and including Schuyler, Adair, Macon, Randolph, Boone, Cole, Miller, Pulaski, Texas, Howell

Illinois zip codes 62000-62999
Missouri zip codes 63000-63999, 65000-65299, 65400-65599
Kentucky zip codes 42000-42099

Illinois (all)
Indiana (all)
Iowa (all)
Missouri (all)
Wisconsin (all)

Illinois counties North of and including Hancock, McDonough, Fulton, Peoria, Tazewell, DeWitt, Platt, Champaign and Vermillion
Indiana counties North of and including Fountain, Montgomery, Boone, Hamilton, Madison, Delaware and Randolph
Iowa counties East of and including Howard, Chickasaw, Bremer, Blackhawk, Benton, Iowa, Keokuk, Wapello and Davis
Wisconsin counties East of and including Iron, Price, Taylor, Clark, Wood, Juneau, Richland and Crawford

Illinois zip codes 60000-62999
Iowa zip codes 50600-50699, 52000-52799
Indiana zip codes 46300-46699
Kentucky zip codes 42000-42099
Missouri zip codes 63099-63199, 63399-64099, 64499-64899, 65099-65899-
Wisconsin* zip codes 53000-53499 *(analyzers not included)