The graph below ranks each Indiana County by total residents according to the 2012 census estimates.
Indiana total population by county
| County | Total Population |
| Marion |  918,887 |
| Lake | 493,118 |
| Allen | 360,496 |
| Hamilton | 289,399 |
| St. Joseph | 266,461 |
| Elkhart | 199,258 |
| Vanderburgh | 180,713 |
| Tippecanoe | 177,786 |
| Porter | 165,681 |
| Hendricks | 150,808 |
| Johnson | 143,300 |
| Monroe | 141,255 |
| Madison | 130,311 |
| Delaware | 117,423 |
| Clark | 111,972 |
| La Porte | 111,197 |
| Vigo | 108,534 |
| Howard | 82,891 |
| Bartholomew | 78,966 |
| Kosciusko | 77,678 |
| Floyd | 75,374 |
| Hancock | 70,896 |
| Morgan | 69,399 |
| Grant | 69,344 |
| Wayne | 68,279 |
| Warrick | 60,445 |
| Boone | 58,994 |
| Dearborn | 49,866 |
| Henry | 49,223 |
| Noble | 47,462 |
| Marshall | 47,035 |
| Lawrence | 46,062 |
| Shelby | 44,499 |
| Jackson | 43,040 |
| DeKalb | 42,246 |
| Dubois | 42,137 |
| Harrison | 39,142 |
| Cass | 38,697 |
| Montgomery | 38,245 |
| Knox | 38,018 |
| Putnam | 37,645 |
| LaGrange | 37,575 |
| Huntington | 36,977 |
| Miami | 36,480 |
| Adams | 34,381 |
| Steuben | 34,180 |
| Gibson | 33,553 |
| Jasper | 33,442 |
| Whitley | 33,312 |
| Greene | 32,973 |
| Clinton | 32,968 |
| Jefferson | 32,489 |
| Wabash | 32,422 |
| Daviess | 32,190 |
| Ripley | 28,504 |
| Jennings | 28,166 |
| Washington | 27,916 |
| Wells | 27,718 |
| Clay | 26,860 |
| Decatur | 26,126 |
| Randolph | 25,848 |
| Posey | 25,589 |
| White | 24,456 |
| Fayette | 23,988 |
| Scott | 23,845 |
| Starke | 23,203 |
| Franklin | 23,003 |
| Jay | 21,385 |
| Owen | 21,372 |
| Sullivan | 21,229 |
| Spencer | 20,900 |
| Fulton | 20,672 |
| Carroll | 20,131 |
| Orange | 19,712 |
| Perry | 19,466 |
| Rush | 17,127 |
| Parke | 17,107 |
| Fountain | 17,096 |
| Vermillion | 15,965 |
| Tipton | 15,756 |
| Brown | 15,069 |
| Newton | 14,065 |
| Pulaski | 13,072 |
| Pike | 12,785 |
| Blackford | 12,554 |
| Crawford | 10,647 |
| Switzerland | 10,416 |
| Martin | 10,261 |
| Benton | 8,844 |
| Warren | 8,391 |
| Union | 7,349 |
| Ohio | 6,065 |