Southwestern Indiana Counties Counties

| IN_No_ | County_Name | Establishment_Date_SW_Indiana_History_Statehood | County_Seat | Time_Zone | Population_2010_Rank | Area_sq_mi_km_2_Rank | Twps | ZIP_code_Prefixes | _of_Boundary_by_water |
|---|---|---|---|---|---|---|---|---|---|
| 14 | Daviess | February 2, 1818 (10) (29) (14) | Washington | Eastern | 32,200 (6) | sqmi (km2) (3) | 10 | 475 | 55% |
| 19 | Dubois | December 20, 1817 (7) (20) (4) | Jasper | Eastern | 41,889 (3) | sqmi (km2) (4) | 12 | 475 | 24% |
| 26 | Gibson | April 1, 1813 (2) (8) (T) | Princeton | Central | 33,503 (5) | sqmi (km2) (1) | 10 | 475/476 | 59% |
| 42 | Knox | June 6, 1790 (1) (1) (T) | Vincennes | Eastern | 38,440 (4) | sqmi (km2) (2) | 10 | 475/478 | 84% |
| 51 | Martin | January 7, 1820 (11) (33) (18) | Shoals | Eastern | 10,334 (11) | sqmi (km2) (10) | 6 | 475 | 18% |