| Adams County | 18001 | Eastern | Berne, Decatur |
| Allen County | 18003 | Eastern | Arcola, Fort Wayne, Grabill, Harlan, Hoagland, New Haven, Woodburn, Yoder |
| Bartholomew County | 18005 | Eastern | Columbus, Edinburgh, Hope, Jonesville |
| Benton County | 18007 | Eastern | Boswell, Earl Park, Fowler, Otterbein, Oxford |
| Blackford County | 18009 | Central | Lee’s Summit |
| Blackford County | 18009 | Eastern | Dunkirk, Hartford City, Montpelier |
| Boone County | 18011 | Eastern | Advance, Lebanon, Whitestown, Zionsville |
| Brown County | 18013 | Eastern | Nashville |
| Carroll County | 18015 | Eastern | Burlington, Camden, Delphi, Flora |
| Cass County | 18017 | Eastern | Logansport, Royal Center |
| Clark County | 18019 | Eastern | Borden, Charlestown, Clarksville, Jeffersonville, New Washington, Sellersburg, Speed |
| Clay County | 18021 | Eastern | Bowling Green, Brazil, Cory |
| Clinton County | 18023 | Eastern | Frankfort, Jefferson, Kirklin, Michigantown |
| Crawford County | 18025 | Eastern | English, Leavenworth, Marengo |
| Daviess County | 18027 | Eastern | Cannelburg, Crane, Montgomery, Odon, Washington |
| De Kalb County | 18033 | Eastern | Ashley, Auburn, Butler, Corunna, Garrett, Hamilton, Waterloo |
| Dearborn County | 18029 | Eastern | Aurora, Greendale, Guilford, Lawrenceburg, West Harrison |
| Decatur County | 18031 | Eastern | Burney, Greensburg, Westport |
| Delaware County | 18035 | Eastern | Albany, Daleville, Muncie, Yorktown |
| Dubois County | 18037 | Eastern | Ferdinand, Holland, Huntingburg, Ireland, Jasper, Kyana, Saint Anthony |
| Elkhart County | 18039 | Eastern | Bristol, Dunlap, Elkhart, Goshen, Middlebury, Millersburg, Nappanee, New Paris, Wakarusa |
| Fayette County | 18041 | Eastern | Connersville |
| Floyd County | 18043 | Eastern | Floyds Knobs, New Albany, Saint Marys |
| Fountain County | 18045 | Eastern | Hillsboro, Kingman, Veedersburg |
| Franklin County | 18047 | Eastern | Batesville, Brookville |
| Fulton County | 18049 | Eastern | Akron, Kewanna, Rochester |
| Gibson County | 18051 | Central | Buckskin, Fort Branch, Francisco, Oakland City, Owensville, Princeton |
| Grant County | 18053 | Eastern | Fairmount, Gas City, Marion, Upland, Van Buren |
| Greene County | 18055 | Eastern | Bloomfield, Jasonville, Linton, Worthington |
| Hamilton County | 18057 | Eastern | Arcadia, Atlanta, Carmel, Fishers, Noblesville, Westfield |
| Hancock County | 18059 | Eastern | Cumberland, Fortville, Greenfield |
| Harrison County | 18061 | Eastern | Corydon, Elizabeth, Mauckport, New Middletown, New Salisbury, Palmyra, Ramsey |
| Hendricks County | 18063 | Eastern | Avon, Brownsburg, Clayton, Coatesville, Danville, Lizton, Pittsboro, Plainfield |
| Henry County | 18065 | Eastern | Knightstown, Middletown, New Castle, Spiceland, Straughn |
| Howard County | 18067 | Eastern | Jerome, Kokomo, Russiaville |
| Huntington County | 18069 | Eastern | Andrews, Huntington, Markle, Roanoke, Warren |
| Jackson County | 18071 | Eastern | Brownstown, Crothersville, Seymour |
| Jasper County | 18073 | Central | Collegeville, DeMotte, Fair Oaks, Remington, Rensselaer, Roselawn |
| Jasper County | 18073 | Eastern | Wheatfield |
| Jay County | 18075 | Eastern | Dunkirk, Portland |
| Jefferson County | 18077 | Eastern | Hanover, Madison |
| Jennings County | 18079 | Eastern | Butlerville, North Vernon |
| Johnson County | 18081 | Eastern | Edinburgh, Franklin, Greenwood, Trafalgar, Whiteland |
| Knox County | 18083 | Central | Vincennes |
| Knox County | 18083 | Eastern | Bicknell, Edwardsport, Oaktown |
| Kosciusko County | 18085 | Eastern | Claypool, Leesburg, Mentone, Milford, Nappanee, Silver Lake, Syracuse, Warsaw |
| La Porte County | 18091 | Central | Kingsbury, La Porte, Michigan City, Rolling Prairie, Westville |
| Lagrange County | 18087 | Eastern | Howe, LaGrange, Shipshewana, South Milford, Topeka, Wolcottville |
| Lake County | 18089 | Central | Crown Point, Dyer, East Chicago, Gary, Griffith, Hammond, Highland, Hobart, Lake Station, Lowell, Merrillville, Munster, Schererville, Shelby, St. John, Whiting |
| Lawrence County | 18093 | Eastern | Bedford, Mitchell |
| Madison County | 18095 | Eastern | Alexandria, Anderson, Elwood, Frankton, Markleville, Orestes, Pendleton, Summitville |
| Marion County | 18097 | Eastern | Cumberland, Indianapolis, Southport, Speedway |
| Marshall County | 18099 | Eastern | Argos, Bremen, Culver, La Paz, Plymouth, Tippecanoe |
| Martin County | 18101 | Eastern | Loogootee, Shoals |
| Miami County | 18103 | Eastern | Bunker Hill, Peru |
| Monroe County | 18105 | Eastern | Bloomington, Ellettsville |
| Montgomery County | 18107 | Eastern | Crawfordsville, Darlington |
| Morgan County | 18109 | Eastern | Martinsville, Mooresville, Paragon |
| Newton County | 18111 | Central | Brook, Goodland, Kentland, Morocco, Roselawn |
| Noble County | 18113 | Eastern | Albion, Avilla, Brimfield, Cromwell, Kendallville, Ligonier, Wolcottville |
| Orange County | 18117 | Eastern | French Lick, Orleans, Paoli |
| Owen County | 18119 | Eastern | Gosport, Spencer |
| Parke County | 18121 | Eastern | Montezuma, Rockville |
| Perry County | 18123 | Central | Cannelton, St. Croix, Tell City, Troy |
| Pike County | 18125 | Eastern | Petersburg |
| Porter County | 18127 | Central | Burns Harbor, Chesterton, Hebron, Kouts, Portage, Porter, Valparaiso |
| Posey County | 18129 | Central | Griffin, Mount Vernon, New Harmony, Poseyville, Wadesville |
| Pulaski County | 18131 | Eastern | Francesville, Winamac |
| Putnam County | 18133 | Eastern | Cloverdale, Greencastle, Putnamville, Reelsville, Russellville |
| Randolph County | 18135 | Eastern | Albany, Lynn, Ridgeville, Union City, Winchester |
| Ripley County | 18137 | Eastern | Batesville, Holton, Milan, Osgood, Sunman, Versailles |
| Rush County | 18139 | Eastern | Arlington, Carthage, Milroy, Rushville |
| Scott County | 18143 | Eastern | Austin, Nabb, Scottsburg |
| Shelby County | 18145 | Eastern | Edinburgh, Fairland, Flat Rock, Morristown, Shelbyville |
| Spencer County | 18147 | Central | Chrisney, Fulda, Grandview, Rockport, Saint Meinrad, Santa Claus |
| St. Joseph County | 18141 | Eastern | Granger, Lakeville, Mishawaka, New Carlisle, South Bend, Walkerton, Wyatt |
| Starke County | 18149 | Central | Knox, North Judson |
| Steuben County | 18151 | Eastern | Angola, Ashley, Fremont, Hamilton, Orland |
| Sullivan County | 18153 | Eastern | Carlisle, Farmersburg, Merom, Sullivan |
| Tippecanoe County | 18157 | Eastern | Clarks Hill, Lafayette, Monroe, Montmorenci, Otterbein, Shadeland, Tippecanoe, West Lafayette |
| Tipton County | 18159 | Eastern | Elwood, Hobbs, Tipton, Windfall |
| Union County | 18161 | Eastern | Brownsville, Liberty, West College Corner |
| Vanderburgh County | 18163 | Central | Evansville |
| Vermillion County | 18165 | Eastern | Cayuga, Clinton, Newport |
| Vigo County | 18167 | Eastern | Pimento, Terre Haute, West Terre Haute |
| Wabash County | 18169 | Eastern | North Manchester, Roann, Urbana, Wabash |
| Warren County | 18171 | Eastern | West Lebanon |
| Warrick County | 18173 | Central | Boonville, Chandler, Elberfeld |
| Washington County | 18175 | Eastern | Salem |
| Wayne County | 18177 | Eastern | Cambridge City, Fountain City, Hagerstown, Richmond |
| Wells County | 18179 | Eastern | Bluffton, Markle, Ossian |
| White County | 18181 | Eastern | Brookston, Buffalo, Monon, Monticello, Reynolds, Wolcott |
| Whitley County | 18183 | Eastern | Churubusco, Columbia City |
