Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Jefferson Church of the Nazarene | Church | 289 | Ashtabula | 41 44 12 N | 080 46 01 W |
| Jefferson Community Park | Park | 317 | Franklin | 40 02 48 N | 082 47 52 W |
| Jefferson County | Civil | 316 | Jefferson | 40 22 00 N | 080 45 00 W |
| Jefferson County Airpark | Airport | 366 | Jefferson | 40 21 30 N | 080 42 14 W |
| Jefferson County Courthouse | Building | 217 | Jefferson | 40 21 36 N | 080 36 49 W |
| Jefferson County Historical Association Museum | Building | 212 | Jefferson | 40 22 14 N | 080 36 39 W |
| Jefferson County Industrial Park | Locale | 372 | Jefferson | 40 24 09 N | 080 43 04 W |
| Jefferson County Technical College | School | 375 | Jefferson | 40 22 35 N | 080 40 19 W |
| Jefferson Creek | Stream | | Harrison | 40 22 02 N | 080 59 46 W |
| Jefferson Elementary School | School | 204 | Adams | 38 46 43 N | 083 19 45 W |
| Jefferson Elementary School | School | 271 | Allen | 40 43 09 N | 084 05 28 W |
| Jefferson Elementary School | School | 286 | Ashtabula | 41 44 16 N | 080 45 48 W |
| Jefferson Elementary School | School | 181 | Butler | 39 23 35 N | 084 33 17 W |
| Jefferson Elementary School | School | 301 | Clinton | 39 17 31 N | 083 54 41 W |
| Jefferson Elementary School | School | 200 | Cuyahoga | 41 35 27 N | 081 30 06 W |
| Jefferson Elementary School | School | 239 | Hancock | 41 01 13 N | 083 38 55 W |
| Jefferson Elementary School | School | 189 | Lake | 41 40 24 N | 081 25 23 W |
| Jefferson Elementary School | School | 315 | Mahoning | 41 07 08 N | 080 40 00 W |
| Jefferson Elementary School | School | 251 | Montgomery | 39 46 13 N | 084 13 17 W |
| Jefferson Elementary School | School | 229 | Muskingum | 40 06 57 N | 082 00 23 W |
| Jefferson Elementary School | School | 178 | Ottawa | 41 30 29 N | 082 56 23 W |
| Jefferson Elementary School | School | 286 | Trumbull | 41 10 52 N | 080 44 51 W |
| Jefferson Elementary School | School | 240 | Van Wert | 40 51 27 N | 084 34 08 W |
| Jefferson Elementary School (historical) | School | 199 | Butler | 39 31 20 N | 084 23 27 W |
| Jefferson Estates | Populated Place | 214 | Pickaway | 39 34 00 N | 082 57 09 W |
| Jefferson Estates | Populated Place | 254 | Williams | 41 35 06 N | 084 29 56 W |
| Jefferson Hall | Building | 195 | Athens | 39 19 37 N | 082 05 48 W |
| Jefferson Heights (subdivision) | Populated Place | 348 | Jefferson | 40 20 23 N | 080 38 29 W |
| Jefferson High School | School | 250 | Montgomery | 39 42 11 N | 084 18 35 W |
| Jefferson High School | School | 233 | Van Wert | 40 51 03 N | 084 21 06 W |
| Jefferson Junior High School | School | 210 | Cuyahoga | 41 28 03 N | 081 43 07 W |
| Jefferson Junior High School | School | 219 | Lorain | 41 22 42 N | 082 07 09 W |
| Jefferson Junior High School | School | 191 | Lucas | 41 43 00 N | 083 36 47 W |
| Jefferson Junior High School | School | 243 | Montgomery | 39 42 09 N | 084 18 45 W |
| Jefferson Junior High School | School | 178 | Ottawa | 41 30 31 N | 082 56 25 W |
| Jefferson Lake | Reservoir | 323 | Jefferson | 40 27 36 N | 080 47 41 W |
| Jefferson Lake Dam | Dam | 323 | Jefferson | 40 27 36 N | 080 47 41 W |
| Jefferson Lake State Park | Park | 340 | Jefferson | 40 28 05 N | 080 48 20 W |
| Jefferson Memorial Middle School | School | 281 | Madison | 39 56 30 N | 083 16 14 W |
| Jefferson Middle School | School | 235 | Van Wert | 40 50 40 N | 084 20 37 W |
| Jefferson Montessori Campus | School | | Montgomery | 39 46 12 N | 084 13 18 W |
| Jefferson Park | Park | 231 | Cuyahoga | 41 27 21 N | 081 46 55 W |
| Jefferson Post Office | Post Office | 292 | Ashtabula | 41 44 14 N | 080 46 09 W |
| Jefferson Presbyterian Cemetery | Cemetery | 251 | Coshocton | 40 19 12 N | 082 00 60 W |
| Jefferson School | School | 308 | Clark | 39 56 21 N | 083 48 29 W |
| Jefferson School | School | 264 | Hamilton | 39 09 39 N | 084 20 49 W |
| Jefferson School | School | 226 | Jackson | 38 51 44 N | 082 37 09 W |
| Jefferson School | School | 275 | Trumbull | 41 13 15 N | 080 49 52 W |
| Jefferson School (historical) | School | 256 | Coshocton | 40 19 00 N | 082 00 55 W |
| Jefferson School (historical) | School | 215 | Pickaway | 39 33 43 N | 082 57 23 W |
| Jefferson Sportsmens Lake Number One | Reservoir | 321 | Jefferson | 40 19 30 N | 080 47 41 W |
| Jefferson Sportsmens Lake Number One Dam | Dam | 321 | Jefferson | 40 19 30 N | 080 47 41 W |
| Jefferson Sportsmens Lake Number Three | Reservoir | 344 | Jefferson | 40 20 06 N | 080 48 11 W |
| Jefferson Sportsmens Lake Number Three Dam | Dam | 344 | Jefferson | 40 20 06 N | 080 48 11 W |
| Jefferson Sportsmens Lake Number Two | Reservoir | 358 | Jefferson | 40 19 42 N | 080 47 41 W |
| Jefferson Sportsmens Lake Number Two Dam | Dam | 358 | Jefferson | 40 19 42 N | 080 47 41 W |
| Jefferson Town Hall | Building | 291 | Ashtabula | 41 44 19 N | 080 46 05 W |
| Jefferson Union High School | School | 378 | Jefferson | 40 26 53 N | 080 44 49 W |
| Jefferson United Methodist Church | Church | 285 | Ashtabula | 41 44 19 N | 080 45 46 W |
| Jefferson Waterworks | Locale | 253 | Ashtabula | 41 45 15 N | 080 47 59 W |
| Jefferson Year-Round One Primary Montessori School | School | | Montgomery | 39 46 09 N | 084 13 15 W |
| Jefferson Year-Round Two Primary Montessori School | School | | Montgomery | 39 46 09 N | 084 13 15 W |
| Jefferson-Jasper Township Cemetery | Cemetery | 322 | Fayette | 39 36 38 N | 083 35 27 W |
| Jeffersonville | Populated Place | 320 | Fayette | 39 39 13 N | 083 33 50 W |
| Jeffersonville (historical) | Populated Place | 206 | Jefferson | 40 20 52 N | 080 36 59 W |
| Jeffersonville Church | Church | 325 | Fayette | 39 39 43 N | 083 34 30 W |
| Jeffersonville Elementary School | School | 320 | Fayette | 39 39 07 N | 083 33 54 W |
| Jeffersonville Post Office | Post Office | 321 | Fayette | 39 39 15 N | 083 33 50 W |
| Jeffersonville United Methodist Church | Church | 322 | Fayette | 39 39 15 N | 083 33 45 W |
| Jeffery Park | Park | 234 | Franklin | 39 58 20 N | 082 56 36 W |
| Jeffrey Courtyard | Park | 238 | Franklin | 39 57 22 N | 082 56 19 W |
| Jelloway | Populated Place | 318 | Knox | 40 32 12 N | 082 18 01 W |
| Jelloway Creek | Stream | | Knox | 40 24 20 N | 082 19 14 W |
| Jelloway Methodist Episcopal Cemetery | Cemetery | 332 | Knox | 40 32 16 N | 082 17 54 W |
| Jelloway Post Office (historical) | Post Office | 319 | Knox | 40 32 10 N | 082 17 60 W |
| Jelloway Valley Farm (historical) | Locale | 319 | Knox | 40 26 50 N | 082 14 20 W |
| Jenera | Populated Place | 260 | Hancock | 40 53 59 N | 083 43 37 W |
| Jenera Post Office | Post Office | 260 | Hancock | 40 54 00 N | 083 43 35 W |
| Jenking-Kite Cemetery | Cemetery | 352 | Champaign | 40 05 45 N | 083 52 55 W |
| Jenkins Airport | Airport | 198 | Sandusky | 41 18 35 N | 083 06 58 W |
| Jenkins Cemetery | Cemetery | 333 | Harrison | 40 14 29 N | 081 15 20 W |
| Jenkins Cemetery | Cemetery | 261 | Jackson | 38 56 02 N | 082 45 14 W |
| Jenkins Cemetery | Cemetery | 256 | Jackson | 38 55 52 N | 082 36 50 W |
| Jenkins Cemetery | Cemetery | 245 | Scioto | 38 55 05 N | 082 45 49 W |
| Jenkins Cemetery | Cemetery | 244 | Scioto | 38 46 34 N | 082 47 19 W |
| Jenkins Chapel | Church | 392 | Champaign | 40 09 19 N | 083 36 30 W |
| Jenkins Chapel Cemetery | Cemetery | 393 | Champaign | 40 09 22 N | 083 36 31 W |
| Jenkins Elementary School | School | 193 | Scioto | 38 45 38 N | 083 01 55 W |
| Jenkins Field | Airport | 330 | Clark | 39 58 14 N | 083 54 42 W |
| Jenkins Hall | Building | 307 | Greene | 39 42 58 N | 083 52 42 W |
| Jenkins Hollow | Valley | | Pike | 39 06 18 N | 082 53 47 W |
| Jenkins Ridge | Ridge | 256 | Gallia | 38 42 31 N | 082 26 19 W |
| Jenkins School (historical) | School | 292 | Muskingum | 39 52 10 N | 082 01 36 W |
| Jenks Creek | Stream | | Geauga | 41 37 53 N | 081 12 17 W |
| Jennick Cemetery | Cemetery | 238 | Lawrence | 38 39 15 N | 082 33 53 W |
| Jennie Watts Run | Stream | | Meigs | 38 57 35 N | 081 53 47 W |
| Jennings Cemetery | Cemetery | 251 | Noble | 39 45 59 N | 081 32 10 W |
| Jennings Creek | Stream | | Putnam | 40 53 56 N | 084 18 04 W |
| Jennings Ditch | Canal | 255 | Wayne | 40 44 25 N | 081 57 04 W |
| Jennings Hall | Building | 211 | Athens | 39 19 39 N | 082 05 56 W |
| Jennings Middle School | School | 302 | Summit | 41 06 12 N | 081 30 23 W |
| Jennings Prairie Ditch | Canal | 248 | Van Wert | 40 43 29 N | 084 26 18 W |
| Jennings School (historical) | School | 254 | Van Wert | 40 41 59 N | 084 24 40 W |
| Jennings-Spencerville Elementary School | School | 247 | Van Wert | 40 44 46 N | 084 24 56 W |
| Jer-Mar Airpark | Airport | 239 | Lorain | 41 15 22 N | 082 08 38 W |
| Jeremy Run | Stream | | Jefferson | 40 30 29 N | 080 37 13 W |
| Jericho | Populated Place | 265 | Butler | 39 23 29 N | 084 22 16 W |
| Jericho | Populated Place | 290 | Butler | 39 32 52 N | 084 40 28 W |
| Jericho | Populated Place | 215 | Monroe | 39 37 03 N | 081 06 22 W |
| Jericho Methodist Cemetery | Cemetery | 208 | Monroe | 39 36 54 N | 081 06 31 W |