1850 Counties of Indiana
| County | Description | Area in sq miles | Courts held at | Pop in 1850 |
| Adams | east side near Wabash & Mt Mary's rivers | 336 | Decatur | 5,797 |
| Allen | northeast part, water by St Joseph & St Mary's rivers, they form Maumee & Wabash rivers to Erie Canal | 650 | Fort Wayne | 16,920 |
| Bartholomew | in southeasternly part, crossed by Driftwood fork of White river | 480 | Columbia | 5.763 |
| Benton | in western part | 520 | Oxford | 1,144 |
| Blackford | NE part, water by Salamanic river | 182 | Blackford | 2,860 |
| Boone | central part | 408 | Lebanon | 11,631 |
| Brown | southern part | 310 | Nashville | 4,846 |
| Carroll | towards northwest part, crossed by Wabash river | 380 | Delphi | 11,015 |
| Cass | north part, crossed by Wabash river | 415 | Logansport | 10,998 |
| Clarke | southeast boundary, on northwest side of Ohio river | 400 | Charleston | 15,828 |
| Clay | western part | 360 | Bowling Green | 7,947 |
| Clinton | central part | 432 | Frankfort | 11,869 |
| Crawford | southern part | 300 | Fredonia | 6,356 |
| Davies | southwest part, between forks of White river | 420 | Washington | 10,354 |
| Dearborn | eastern boundary, northwest side of Ohio river | 380 | Lawrenceville | 20,168 |
| Decatur | southeast part | 340 | Greensburgh | 15,107 |
| De Kalb | east boundary, crossed by St Joseph's river | 365 | Auburn | 8,251 |
| Delaware | eastern part | 384 | Muncietown | 10,843 |
| Dubois | southern part, east fork of White river on north | 432 | Jasper | 6,321 |
| Elkhart | northern boundary, crossed by St Joseph's river | 460 | Goshen | 12,690 |
| Fayette | eastern part, crossed by White river | 200 | Connersville | 10,216 |
| Floyd | southern part, Ohio river on southeast | 144 | New Albany | 14,875 |
| Fountain | western part, with Wabash river on the west & northwest | 390 | Covington | 13,262 |
| Franklin | eastern boundary, crossed by White Water river | 540 | Brookville | 5,768 |
| Fulton | northern part | 350 | Rochester | 5,981 |
| Gibson | western boundary, Wabash river on west | 450 | Princeton | 10,771 |
| Grant | eastern part | 415 | Marion | 11,092 |
| Greene | southwest part, crossed by west fork of White river | 456 | Bloomfield | 11,424 |
| Hamilton | central part, crossed by west fork of White river | 400 | Noblesville | 12,683 |
| Hancock | eastern part | 310 | Greenfield | 9,698 |
| Harrison | southern part, Ohio river on south | 470 | Croydon | 15,286 |
| Hendricks | near the center, water by Eel river, White Lick & Mud creeks | 400 | not listed | 14,083 |
| Henry | eastern part | 380 | Newcastle | 17,604 |
| Howard | no description | blank | Kokomo | 6,657 |
| Huntington | north eastern part, crossed by Wabash river | 384 | Huntington | 7,850 |
| Jackson | southern part, crossed by east fork of White river | 500 | Brownstown | 11,048 |
| Jasper | west boundary, crossed by Iroquois river | 980 | Rensselaer | 3,540 |
| Jay | east boundary | 370 | Jay | 7,065 |
| Jefferson | southern boundary on Ohio river | 360 | Madison | 23,914 |
| Jennings | southeast part | 380 | Vernon | 3,422 |
| Johnson | south part | 320 | Franklin | 12,101 |
| Knox | western boundary, Wabash river on west & White river on southeast | 540 | Vincennes | 11,084 |
| Kosciusko | northern part | 567 | Warsaw | 10,243 |
| La Grange | northern boundary, water by Fawn, Pigeon & Little Elkhart rivers | 380 | La Grange | 8,537 |
| Lake | northwest corner on Lake Michigan | 468 | Lake Court House, Crown Point | 3,991 |
| La Porte | north boundary, with Lake Michigan on northwest | 460 | La Porte | 12,145 |
| Lawrence | toward southern part, crossed by east fork of White river | 438 | Bedford | 12,097 |
| Madison | toward east part | 390 | Andersontown | 12,369 |
| Marion | in center, crossed by West Fork of White river | 400 | Indianapolis (State Capital) | 24,100 |
| Marshall | northeastern part | 440 | Plymouth | 5,348 |
| Martin | southern part, crossed by east fork of White river | 300 | Mount Pleasant | 5,941 |
| Miami | northern part, crossed by Wabash river | 380 | Peru | 11,304 |
| Monroe | southern part | 390 | Bloomington | 11,285 |
| Montgomery | western part | 504 | Crawfordsville | 18,094 |
| Morgan | central part, crossed by west fork of White river | 453 | Martinsville | 14,479 |
| Noble | northeastern part | 432 | Noble & Albion | 7,946 |
| Ohio | no description | blank | Hartford | 5,308 |
| Orange | southern part | 378 | Paoli | 10,809 |
| Owen | toward western part, crossed by west fork of White river | 380 | Spencer | 12,118 |
| Parke | western part, Wabash river on west | 450 | Rockville | 14,966 |
| Perry | southern boundary, Ohio river on south | 400 | Troy | 7,268 |
| Pike | southwest part, White river on north | 325 | Petersburgh | 7,720 |
| Porter | northern boundary, Lake Michigan on north, Kankakee river on south | not listed | Valparaiso | 5,234 |
| Posey | at the southwest corner, Ohio river on south, Wabash on west | 450 | Mount Vernon | 12,550 |
| Pulaski | northwestern part, crossed by Tippecanoe river | 342 | Winamac | 2,595 |
| Putnam | toward west part | 486 | Green Castle | 20,614 |
| Randolph | east boundary | 440 | Winchester | 14,725 |
| Ripley | southeast part | 400 | Versailles | 7,198 |
| Rush | toward east part | 400 | Rushville | 16,466 |
| St Joseph | on north boundary, crossed by St Joseph river | 468 | South Bend | 10,954 |
| Scott | in southeastern part | 200 | Lexington | 5,855 |
| Shelby | toward southeast part | 432 | Shelbyville | 15,502 |
| Spencer | on southern boundary, Ohio river on south | 400 | Rockport | 8,620 |
| Stark | in northwestern part, crossed by Kankakee river | 432 | blank | 557 |
| Steuben | northeast corner | 225 | Angola | 6,104 |
| Sullivan | on west boundary, Wabash river on west | 430 | Sullivan Court House | 10,143 |
| Switzerland | on southeastern boundary, Ohio river on southeast | 216 | Vevay | 12,890 |
| Tippecanoe | western part, crossed by Wabash river | 204 | La Fayette | 19,377 |
| Tipton | central part | blank | Tipton | 3,532 |
| Union | on eastern boundary | 224 | Liberty | 6,944 |
| Vanderburg | on southern boundary, Ohio river on southwest | 225 | Evansville | 11,414 |
| Vermilion | on west boundary, Wabash river on east | 280 | Newport | 8,661 |
| Vigo | west boundary, Wabash river on west | 400 | Terre Haute | 15,283 |
| Wabash | toward northern part, crossed by Wabash river | 415 | Wabash | 12,138 |
| Warren | on west boundary, Wabash river on southeast | 350 | Williamsport | 7,387 |
| Warrick | on southern boundary, Ohio river on south | 360 | Booneville | 8,811 |
| Washington | in southern part | 540 | Salem | 17,040 |
| Wayne | on east boundary | 420 | Centreville | 25,321 |
| Wells | in east part | 372 | Bluffton | 6,152 |
| White | in northwestern part, crossed by Tippecanoe river | 530 | Monticello | 4,761 |
| Whitley | northeast part | 324 | Whitley Court House | 5,190 |