Ohio County was a part of Dearborn County prior to 1844. See Dearborn County Directories for those records.
City and County Directories
State and Regional Directories
| Directory | Ohio County | Rising Sun |
| 1846 Western & Southern Business Directory | Index | N/A |
| 1849 Indiana Gazetteer | Index | N/A |
| 1858 Indiana Gazetteer and Business Directory | Index | N/A |
| 1860 Indiana Gazetteer and Business Directory | Index | N/A |
| 1861 Ohio River Gazetteer | Index | N/A |
| 1862 Indiana Gazetteer and Business Directory | Index | N/A |
| 1866 Indiana Gazetteer and Shippers’ Guide | Index | N/A |
| 1868 Indiana Business Directory and Shippers’ Guide | Index | N/A |
| 1876 Indiana Atlas Business Directory | Directory Patrons |
N/A |
| 1880 Indiana Gazetteer and Business Directory | Index | N/A |
| 1882 Indiana Gazetteer and Business Directory | Index | N/A |
| 1884 Indiana Gazetteer and Business Directory | Index | N/A |
| 1887 Indiana Gazetteer and Business Directory | Index | Index |
| 1890 Indiana Gazetteer and Business Directory | Index | Index |
| 1892 Indiana Gazetteer and Business Directory | Index | Index |
| 1895 Indiana Gazetteer and Business Directory | Index | Index |
| 1916 Indiana Gazetteer and Business Directory | Index | N/A |