Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Jacobs Elementary School | School | 241 | Hancock | 41 03 35 N | 083 38 25 W |
| Jacobs Field | Park | 206 | Cuyahoga | 41 29 46 N | 081 41 07 W |
| Jacobs Hall | Building | 354 | Ashland | 40 51 36 N | 082 19 13 W |
| Jacobs Ladder | Summit | 361 | Fairfield | 39 39 06 N | 082 38 30 W |
| Jacobs Lake | Reservoir | 358 | Ashland | 40 49 54 N | 082 17 30 W |
| Jacobs Lake Dam | Dam | 358 | Ashland | 40 49 54 N | 082 17 30 W |
| Jacobsburg | Populated Place | 395 | Belmont | 39 57 54 N | 080 54 15 W |
| Jacobsburg | Populated Place | 366 | Monroe | 39 45 32 N | 081 14 54 W |
| Jacobsburg Cemetery | Cemetery | 403 | Belmont | 39 57 37 N | 080 54 10 W |
| Jacobsburg Cemetery | Cemetery | 202 | Huron | 41 16 21 N | 082 38 06 W |
| Jacobsburg Post Office | Post Office | 396 | Belmont | 39 57 55 N | 080 54 15 W |
| Jacoby Branch | Stream | | Greene | 39 45 43 N | 083 54 39 W |
| Jacoby Bridge | Bridge | 288 | Marion | 40 29 42 N | 083 03 26 W |
| Jacot Park | Park | 241 | Butler | 39 30 15 N | 084 21 08 W |
| Jacquays Run | Stream | | Scioto | 38 48 32 N | 083 03 33 W |
| Jaite | Populated Place | 200 | Cuyahoga | 41 17 18 N | 081 34 25 W |
| Jaite Mill Historic District | Park | 200 | Cuyahoga | 41 17 18 N | 081 34 25 W |
| Jaite Post Office (historical) | Post Office | 197 | Cuyahoga | 41 17 20 N | 081 34 24 W |
| Jake Run | Stream | | Scioto | 38 40 18 N | 083 13 40 W |
| Jakes Run | Stream | | Belmont | 39 55 32 N | 081 03 57 W |
| James A Garfield Elementary School | School | 250 | Lake | 41 35 24 N | 081 25 01 W |
| James A Garfield National Historic Site | Park | 209 | Lake | 41 39 54 N | 081 21 03 W |
| James A Gavin Power Plant | Building | 172 | Gallia | 38 56 08 N | 082 07 04 W |
| James A Rhodes Airport | Airport | 217 | Jackson | 38 58 52 N | 082 34 40 W |
| James A Rhodes Health and Physical Education Building | Building | 326 | Summit | 41 04 33 N | 081 30 32 W |
| James A Rhodes State Office Tower | Building | 231 | Franklin | 39 57 46 N | 082 59 58 W |
| James A Rhodes Student Center | Building | 201 | Gallia | 38 52 50 N | 082 22 48 W |
| James Borrer Farm Cemetery | Cemetery | 210 | Pickaway | 39 45 07 N | 083 00 56 W |
| James Bryant Chapel | Church | 248 | Lorain | 41 17 41 N | 082 13 06 W |
| James Cancer Hospital and Research Institute | Hospital | 224 | Franklin | 39 59 43 N | 083 01 03 W |
| James Cemetery | Cemetery | 201 | Pike | 39 01 24 N | 082 56 40 W |
| James Conger Elementary School | School | 281 | Delaware | 40 17 54 N | 083 03 17 W |
| James Day Park | Park | 183 | Lorain | 41 27 37 N | 082 06 13 W |
| James H McBride Arboretum | Locale | 183 | Erie | 41 24 05 N | 082 35 52 W |
| James Hall | Building | 194 | Athens | 39 19 28 N | 082 06 19 W |
| James Hall Landing | Locale | 172 | Meigs | 38 56 17 N | 081 48 03 W |
| James Hanna Park | Park | 248 | Cuyahoga | 41 24 23 N | 081 45 49 W |
| James J Hilfiker Elementary School | School | 207 | Sandusky | 41 22 56 N | 083 19 39 W |
| James J Thomas Park | Park | 231 | Franklin | 40 01 46 N | 083 05 36 W |
| James Kilbourne Memorial Library | Building | 268 | Franklin | 40 05 22 N | 083 01 03 W |
| James M Cox Dayton International Airport | Airport | 305 | Montgomery | 39 54 08 N | 084 13 10 W |
| James Road School | School | 238 | Franklin | 39 57 04 N | 082 54 60 W |
| James School (historical) | School | 286 | Muskingum | 39 48 00 N | 081 42 54 W |
| James Temple Church of God in Christ | Church | 238 | Hamilton | 39 07 55 N | 084 29 05 W |
| James Thomas Park | Park | 237 | Franklin | 40 01 19 N | 083 05 51 W |
| Jameson Creek | Stream | | Hamilton | 39 14 07 N | 084 48 23 W |
| Jamesplace Plaza Shopping Center | Locale | 323 | Trumbull | 41 11 50 N | 080 43 40 W |
| Jamestown | Populated Place | 323 | Greene | 39 39 29 N | 083 44 06 W |
| Jamestown Friends Meeting House | Church | 322 | Greene | 39 39 27 N | 083 43 49 W |
| Jamestown Post Office | Post Office | 324 | Greene | 39 39 30 N | 083 44 05 W |
| Jamison Creek | Stream | | Ashland | 40 52 20 N | 082 16 57 W |
| Jamison Mine | Mine | 359 | Harrison | 40 13 02 N | 080 56 28 W |
| Jamison School (historical) | School | 311 | Muskingum | 40 01 19 N | 081 47 40 W |
| Jamisons Run | Stream | | Warren | 39 27 25 N | 084 11 44 W |
| Jance School (historical) | School | 374 | Holmes | 40 34 43 N | 082 08 05 W |
| Jane Addams Elementary School | School | 290 | Montgomery | 39 44 55 N | 084 16 23 W |
| Jane Newcom Park | Park | 285 | Montgomery | 39 43 00 N | 084 09 25 W |
| Janes School (historical) | School | 282 | Huron | 41 09 36 N | 082 20 59 W |
| Jaquay Lake | Reservoir | 240 | Lorain | 41 20 26 N | 081 56 07 W |
| Jarnigan Knob | Summit | 378 | Highland | 39 06 45 N | 083 25 08 W |
| Jarrett Wood Subdivision | Populated Place | 223 | Paulding | 41 10 40 N | 084 45 37 W |
| Jarvis | Populated Place | 227 | Ross | 39 22 10 N | 082 53 25 W |
| Jarvis Cemetery | Cemetery | 245 | Washington | 39 20 23 N | 081 50 10 W |
| Jarvis Post Office (historical) | Post Office | 226 | Ross | 39 22 12 N | 082 53 27 W |
| Jasinsky Cemetery | Cemetery | 408 | Logan | 40 24 22 N | 083 39 44 W |
| Jasper | Populated Place | 169 | Pike | 39 03 00 N | 083 03 24 W |
| Jasper Elementary School | School | 319 | Fayette | 39 35 49 N | 083 35 29 W |
| Jasper Elementary School | School | 171 | Pike | 39 03 16 N | 083 03 37 W |
| Jasper Hill | Summit | 273 | Athens | 39 14 05 N | 081 56 24 W |
| Jasper Hill School (historical) | School | 261 | Athens | 39 13 55 N | 081 56 21 W |
| Jasper Knob | Summit | 359 | Pike | 39 02 09 N | 083 03 48 W |
| Jasper Methodist Cemetery | Cemetery | 177 | Pike | 39 02 57 N | 083 03 18 W |
| Jasper Mills | Populated Place | 303 | Fayette | 39 31 07 N | 083 31 14 W |
| Jasper Post Office | Post Office | 168 | Pike | 39 03 00 N | 083 03 25 W |
| Jasper School (historical) | School | 303 | Fayette | 39 31 08 N | 083 31 17 W |
| Jaybird | Populated Place | 195 | Adams | 38 56 22 N | 083 17 54 W |
| Jaybird Branch | Stream | | Adams | 38 56 12 N | 083 17 33 W |
| Jaybird Cemetery | Cemetery | 202 | Adams | 38 56 21 N | 083 18 05 W |
| Jaybird Post Office (historical) | Post Office | 195 | Adams | 38 56 22 N | 083 17 54 W |
| Jaycee Park | Park | 277 | Auglaize | 40 33 39 N | 084 10 52 W |
| Jaycee Park | Park | 182 | Erie | 41 26 33 N | 082 41 58 W |
| Jaycee Riverside Park | Park | 214 | Muskingum | 39 58 22 N | 081 59 24 W |
| Jaycees Park | Park | 288 | Auglaize | 40 25 57 N | 084 22 52 W |
| Jaymar Heliport | Airport | 173 | Gallia | 38 57 39 N | 082 06 01 W |
| Jaysville | Populated Place | 323 | Darke | 40 02 53 N | 084 35 57 W |
| Jaysville Post Office (historical) | Post Office | 324 | Darke | 40 02 55 N | 084 35 55 W |
| JBR Airport | Airport | 286 | Brown | 38 54 40 N | 084 01 34 W |
| Jeaneret Park | Park | 334 | Stark | 40 51 04 N | 081 23 38 W |
| Jeanette Albiez Davis Library | Building | 202 | Gallia | 38 52 54 N | 082 22 44 W |
| Jeans Lake | Reservoir | 298 | Medina | 41 06 12 N | 081 48 29 W |
| Jeans Lake Dam | Dam | 298 | Medina | 41 06 12 N | 081 48 29 W |
| Jeavons Boat Yard | Locale | 181 | Erie | 41 25 18 N | 082 21 10 W |
| Jeddo Run | Stream | | Jefferson | 40 26 57 N | 080 36 23 W |
| Jeddoe | Populated Place | 326 | Portage | 41 16 37 N | 081 08 41 W |
| Jediah Hill Covered Bridge | Bridge | 210 | Hamilton | 39 15 08 N | 084 32 43 W |
| Jeff Cemetery | Cemetery | 341 | Clinton | 39 24 12 N | 083 36 01 W |
| Jeffco Lake | Reservoir | 294 | Ashtabula | 41 33 54 N | 080 38 35 W |
| Jeffco Lake Dam | Dam | 294 | Ashtabula | 41 33 54 N | 080 38 35 W |
| Jeffers Cemetery | Cemetery | 280 | Athens | 39 14 19 N | 082 03 41 W |
| Jeffers Ditch | Canal | 203 | Lucas | 41 27 09 N | 083 51 01 W |
| Jefferson | Populated Place | 292 | Ashtabula | 41 44 19 N | 080 46 11 W |
| Jefferson | Populated Place | 260 | Fairfield | 39 48 50 N | 082 45 39 W |
| Jefferson | Populated Place | 345 | Wayne | 40 48 06 N | 082 01 23 W |
| Jefferson Airport | Airport | 277 | Ashtabula | 41 45 11 N | 080 46 29 W |
| Jefferson Area High School | School | 285 | Ashtabula | 41 44 05 N | 080 46 52 W |
| Jefferson Avenue Church of Christ in Christian Union | Church | 188 | Ross | 39 19 59 N | 082 57 38 W |
| Jefferson Avenue Historic District | Park | 240 | Franklin | 39 57 56 N | 082 59 05 W |
| Jefferson Branch Cleveland Public Library | Building | 207 | Cuyahoga | 41 28 45 N | 081 41 07 W |
| Jefferson Cemetery | Cemetery | 293 | Franklin | 40 00 00 N | 082 48 35 W |
| Jefferson Cemetery | Cemetery | 343 | Wayne | 40 48 00 N | 082 01 22 W |