Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Knoles Pond Dam | Dam | 231 | Ross | 39 15 30 N | 082 58 60 W |
| Knoll Brook | Stream | | Warren | 39 29 42 N | 084 00 56 W |
| Knollbrook Golf Course | Locale | 277 | Medina | 41 02 32 N | 082 01 52 W |
| Knollwood | Populated Place | 278 | Greene | 39 44 00 N | 084 04 02 W |
| Knollwood Cemetery | Cemetery | 333 | Cuyahoga | 41 30 44 N | 081 26 36 W |
| Knollwood Elementary School | School | 187 | Lorain | 41 28 56 N | 082 05 10 W |
| Knollwood Shopping Center | Locale | 277 | Greene | 39 44 15 N | 084 05 14 W |
| Knollwood Village | Populated Place | 238 | Pickaway | 39 37 18 N | 082 53 59 W |
| Knoop Cemetery | Cemetery | 256 | Miami | 40 01 14 N | 084 09 21 W |
| Knoop School (historical) | School | 252 | Miami | 40 01 16 N | 084 10 01 W |
| Knore Airport | Airport | 203 | Scioto | 38 50 15 N | 082 50 06 W |
| Knore Cemetery | Cemetery | 178 | Scioto | 38 48 39 N | 082 50 46 W |
| Knotty Oak School (historical) | School | 385 | Knox | 40 32 07 N | 082 28 36 W |
| Knowles Cemetery | Cemetery | 252 | Lorain | 41 14 01 N | 082 05 19 W |
| Knowlton Bridge | Bridge | 207 | Monroe | 39 36 04 N | 081 09 25 W |
| Knowlton Cemetery | Cemetery | 266 | Monroe | 39 41 07 N | 081 12 18 W |
| Knowlton Cemetery | Cemetery | 250 | Wyandot | 40 59 08 N | 083 19 11 W |
| Knowltons Corner | Populated Place | 149 | Hamilton | 39 09 30 N | 084 32 21 W |
| Knox | Populated Place | 320 | Knox | 40 27 27 N | 082 31 46 W |
| Knox | Populated Place | 206 | Vinton | 39 15 58 N | 082 17 09 W |
| Knox Cemetery | Cemetery | 301 | Muskingum | 39 45 20 N | 081 41 58 W |
| Knox Chapel | Church | 202 | Hamilton | 39 08 17 N | 084 26 30 W |
| Knox Community Hospital | Hospital | 333 | Knox | 40 23 55 N | 082 27 08 W |
| Knox County | Civil | 296 | Knox | 40 24 00 N | 082 22 20 W |
| Knox County Airport | Airport | 366 | Knox | 40 19 43 N | 082 31 25 W |
| Knox County Courthouse | Building | 318 | Knox | 40 23 38 N | 082 28 57 W |
| Knox County Fairgrounds | Locale | 322 | Knox | 40 24 55 N | 082 28 24 W |
| Knox County Infirmary (historical) | Locale | 340 | Knox | 40 20 52 N | 082 33 04 W |
| Knox County Jail | Building | 317 | Knox | 40 23 37 N | 082 28 59 W |
| Knox County Opportunity Center | Building | 354 | Knox | 40 24 13 N | 082 25 57 W |
| Knox Elementary School | School | 357 | Columbiana | 40 51 37 N | 081 01 47 W |
| Knox Lake | Reservoir | 346 | Knox | 40 29 48 N | 082 31 31 W |
| Knox Lake Dam | Dam | 346 | Knox | 40 29 48 N | 082 31 31 W |
| Knox Lake State Wildlife Area | Park | 337 | Knox | 40 30 50 N | 082 29 38 W |
| Knox Post Office (historical) | Post Office | 320 | Knox | 40 27 30 N | 082 31 45 W |
| Knox School (historical) | School | 338 | Holmes | 40 36 37 N | 082 07 32 W |
| Knox Vernon Speedway | Locale | 357 | Knox | 40 24 25 N | 082 26 31 W |
| Knox Woods State Nature Preserve | Park | 342 | Knox | 40 24 10 N | 082 25 43 W |
| Knoxdale | Populated Place | 222 | Paulding | 41 11 53 N | 084 40 31 W |
| Knoxdale Post Office (historical) | Post Office | 222 | Paulding | 41 11 55 N | 084 40 30 W |
| Knoxville | Populated Place | 395 | Jefferson | 40 29 32 N | 080 40 50 W |
| Knoxville Cemetery | Cemetery | 389 | Jefferson | 40 29 32 N | 080 41 01 W |
| Knoxville Elementary School | School | 376 | Jefferson | 40 29 16 N | 080 40 54 W |
| Knoxville Post Office (historical) | Post Office | 391 | Jefferson | 40 29 30 N | 080 40 49 W |
| Knuth Community Center | Building | 188 | Cuyahoga | 41 36 31 N | 081 30 55 W |
| Kobacher Park | Park | 236 | Franklin | 39 56 51 N | 082 58 57 W |
| Koch Cemetery | Cemetery | 315 | Columbiana | 40 53 21 N | 080 33 12 W |
| Koch Hall | Building | 294 | Clark | 39 56 04 N | 083 48 59 W |
| Kochis Park | Park | 289 | Mahoning | 41 06 38 N | 080 41 13 W |
| Koder School (historical) | School | 256 | Defiance | 41 24 46 N | 084 47 30 W |
| Koebel Elementary School | School | 235 | Franklin | 39 54 50 N | 082 57 28 W |
| Koening Park | Park | 167 | Hamilton | 39 13 46 N | 084 26 43 W |
| Koeppe School | School | 264 | Cuyahoga | 41 22 06 N | 081 47 50 W |
| Koepter Ditch | Canal | 207 | Lucas | 41 38 26 N | 083 50 08 W |
| Koffolt Laboratories | Building | 229 | Franklin | 40 00 13 N | 083 00 45 W |
| Koger Hollow | Valley | | Pike | 38 57 34 N | 082 53 29 W |
| Kohart Lake | Reservoir | 206 | Defiance | 41 13 54 N | 084 23 36 W |
| Kohart Lake Dam | Dam | 206 | Defiance | 41 13 54 N | 084 23 36 W |
| Kohl Hall | Building | 209 | Wood | 41 22 29 N | 083 38 17 W |
| Kohl Lake | Reservoir | 303 | Williams | 41 41 06 N | 084 42 24 W |
| Kohl Lake Dam | Dam | 303 | Williams | 41 41 06 N | 084 42 24 W |
| Kohler Hall | Building | 242 | Cuyahoga | 41 22 07 N | 081 51 06 W |
| Kokeene Hollow | Valley | | Gallia | 38 50 13 N | 082 32 37 W |
| Kokosing Heliport | Airport | 333 | Knox | 40 29 28 N | 082 33 39 W |
| Kokosing River | Stream | | Knox | 40 21 36 N | 082 09 37 W |
| Kokosing Wildlife Area | Park | 339 | Knox | 40 30 48 N | 082 34 58 W |
| Kolb Cemetery | Cemetery | 358 | Holmes | 40 35 30 N | 081 40 46 W |
| Kolb Creek | Stream | | Hamilton | 39 16 11 N | 084 49 10 W |
| Kolbe Hall | Building | 327 | Summit | 41 04 34 N | 081 30 35 W |
| Kolmont | Populated Place | 215 | Jefferson | 40 18 44 N | 080 39 39 W |
| Kolmont Community Church | Church | 216 | Jefferson | 40 18 43 N | 080 39 42 W |
| Konneker Alumni Center | Building | 212 | Athens | 39 19 30 N | 082 05 57 W |
| Konzem Ditch | Canal | 209 | Henry | 41 27 30 N | 084 07 23 W |
| Koogle Cemetery | Cemetery | 320 | Richland | 40 46 17 N | 082 23 55 W |
| Koogle School (historical) | School | 320 | Richland | 40 46 15 N | 082 23 55 W |
| Kool Lake | Lake | 279 | Summit | 41 09 03 N | 081 32 46 W |
| Koons Airport | Airport | 400 | Columbiana | 40 53 00 N | 080 52 59 W |
| Koontz Bar | Bar | 201 | Columbiana | 40 37 05 N | 080 37 49 W |
| Koontz Cemetery | Cemetery | 226 | Gallia | 38 55 36 N | 082 23 15 W |
| Koontz Church | Church | 202 | Gallia | 38 55 40 N | 082 22 58 W |
| Kope Hollow | Valley | | Brown | 38 45 55 N | 083 52 42 W |
| Kopp Creek | Stream | | Auglaize | 40 32 02 N | 084 22 54 W |
| Kopp School (historical) | School | 265 | Auglaize | 40 30 34 N | 084 23 19 W |
| Korb Hall | Building | 347 | Portage | 41 08 55 N | 081 20 20 W |
| Korean Full Gospel Church of Dayton | Church | 275 | Montgomery | 39 43 52 N | 084 07 53 W |
| Korean Presbyterian Church of Toledo | Church | 189 | Lucas | 41 37 48 N | 083 34 28 W |
| Korean United Methodist Church | Church | 259 | Hamilton | 39 07 40 N | 084 31 17 W |
| Korean United Methodist Church of Greater Youngstown | Church | 324 | Mahoning | 41 07 16 N | 080 39 03 W |
| Korn Landing Field | Airport | 316 | Shelby | 40 25 17 N | 084 05 03 W |
| Kornvolt Farms Pond | Reservoir | 315 | Highland | 39 15 24 N | 083 37 06 W |
| Kornvolt Farms Pond Dam | Dam | 315 | Highland | 39 15 24 N | 083 37 06 W |
| Kosik Private Airport | Airport | 260 | Lorain | 41 14 33 N | 082 16 13 W |
| Kossuth | Populated Place | 258 | Auglaize | 40 39 34 N | 084 20 53 W |
| Kossuth Cemetery | Cemetery | 256 | Auglaize | 40 39 30 N | 084 20 50 W |
| Kossuth Colony Historic District | Park | 231 | Montgomery | 39 46 58 N | 084 10 16 W |
| Kossuth Post Office (historical) | Post Office | 258 | Auglaize | 40 39 34 N | 084 20 53 W |
| Kossuth Zion United Methodist Church | Church | 257 | Auglaize | 40 39 32 N | 084 21 01 W |
| Kosters Dock | Locale | 174 | Erie | 41 35 32 N | 082 42 26 W |
| Kottman Hall | Building | 226 | Franklin | 40 00 09 N | 083 01 37 W |
| Kountze Memorial Cemetery | Cemetery | 353 | Stark | 40 47 05 N | 081 17 13 W |
| Kozy Corners | Populated Place | 259 | Pickaway | 39 34 07 N | 083 12 06 W |
| Kraft Cemetery | Cemetery | 414 | Monroe | 39 43 21 N | 080 57 58 W |
| Kramer Cemetery | Cemetery | 276 | Brown | 39 09 28 N | 083 59 14 W |
| Kramer Cemetery | Cemetery | 250 | Franklin | 39 49 34 N | 082 48 44 W |
| Kramer Ditch (historical) | Canal | 209 | Lucas | 41 39 28 N | 083 50 20 W |
| Kramer Elementary School | School | 291 | Butler | 39 30 57 N | 084 45 01 W |
| Kramers Addition (subdivision) | Populated Place | 234 | Franklin | 39 50 47 N | 082 48 10 W |
| Kraner Park | Park | 228 | Franklin | 39 56 26 N | 082 51 45 W |
| Kratz School (historical) | School | 209 | Henry | 41 19 36 N | 084 05 44 W |
| Kraut Creek | Stream | | Darke | 40 08 55 N | 084 44 33 W |