Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Jack Martin Park | Park | 418 | Logan | 40 21 35 N | 083 44 26 W |
| Mansfield Bible Church | Church | 418 | Richland | 40 44 42 N | 082 31 15 W |
| Mid-Ohio Race Course | Locale | 418 | Morrow | 40 41 20 N | 082 38 14 W |
| School Number 1 (historical) | School | 418 | Morrow | 40 33 54 N | 082 42 36 W |
| Township of Monroe | Civil | 418 | Logan | 40 17 21 N | 083 41 07 W |
| Walters Cemetery | Cemetery | 418 | Morrow | 40 38 52 N | 082 39 50 W |
| Williamsport | Populated Place | 418 | Morrow | 40 34 46 N | 082 43 48 W |
| Williamsport United Methodist Church | Church | 418 | Morrow | 40 34 39 N | 082 43 57 W |
| Wilson Cemetery | Cemetery | 418 | Monroe | 39 50 19 N | 081 11 13 W |
| WRGM-AM (Ontario) | Tower | 418 | Richland | 40 46 05 N | 082 37 04 W |
| Dickson Park | Park | 417 | Richland | 40 44 35 N | 082 32 07 W |
| Highland High School | School | 417 | Morrow | 40 23 42 N | 082 41 53 W |
| Huntsman School (historical) | School | 417 | Richland | 40 35 32 N | 082 37 26 W |
| Mount Pleasant School (historical) | School | 417 | Morrow | 40 37 00 N | 082 44 50 W |
| Old Center Cemetery | Cemetery | 417 | Richland | 40 36 04 N | 082 37 27 W |
| Prospect Elementary School | School | 417 | Richland | 40 44 44 N | 082 31 11 W |
| School Number 3 (historical) | School | 417 | Ashland | 40 36 02 N | 082 19 38 W |
| Westland Cemetery | Cemetery | 417 | Logan | 40 17 29 N | 083 39 25 W |
| Hidden Hollow Camp | Locale | 416 | Richland | 40 38 11 N | 082 26 17 W |
| Pleasant Grove Church | Church | 416 | Morrow | 40 36 58 N | 082 44 51 W |
| Township of South Bloomfield | Civil | 416 | Morrow | 40 22 48 N | 082 42 16 W |
| Bethel Cemetery | Cemetery | 415 | Monroe | 39 49 38 N | 080 54 41 W |
| Bethel Church | Church | 415 | Monroe | 39 49 39 N | 080 54 41 W |
| Chapel Hill | Summit | 415 | Belmont | 40 00 31 N | 080 59 39 W |
| Cornbread School (historical) | School | 415 | Logan | 40 19 05 N | 083 42 57 W |
| Harper Cemetery | Cemetery | 415 | Logan | 40 25 07 N | 083 42 08 W |
| Marion Avenue School (historical) | School | 415 | Richland | 40 45 24 N | 082 31 52 W |
| Ontario Junior High School | School | 415 | Richland | 40 45 39 N | 082 38 34 W |
| Ontario Post Office | Post Office | 415 | Richland | 40 45 35 N | 082 35 25 W |
| Pleasant Grove Cemetery | Cemetery | 415 | Morrow | 40 37 01 N | 082 44 51 W |
| Sandridge Cemetery | Cemetery | 415 | Ashland | 40 34 56 N | 082 18 36 W |
| School Number 2 (historical) | School | 415 | Logan | 40 22 37 N | 083 44 58 W |
| Stewart (historical) | Populated Place | 415 | Richland | 40 46 48 N | 082 35 25 W |
| WOSV-FM (Mansfield) | Tower | 415 | Richland | 40 42 33 N | 082 29 11 W |
| Camp Ninwan | Locale | 414 | Richland | 40 47 13 N | 082 37 08 W |
| City Cemetery | Cemetery | 414 | Logan | 40 22 06 N | 083 44 45 W |
| Clark Hill | Summit | 414 | Belmont | 40 06 18 N | 080 57 43 W |
| Fallerius Pond | Reservoir | 414 | Richland | 40 42 48 N | 082 35 30 W |
| Fallerius Pond Dam | Dam | 414 | Richland | 40 42 48 N | 082 35 30 W |
| Friendship Cemetery | Cemetery | 414 | Knox | 40 22 43 N | 082 34 30 W |
| Galloway Knob | Summit | 414 | Belmont | 40 00 42 N | 080 58 15 W |
| Kraft Cemetery | Cemetery | 414 | Monroe | 39 43 21 N | 080 57 58 W |
| Madison High School | School | 414 | Richland | 40 46 28 N | 082 27 39 W |
| Ontario | Populated Place | 414 | Richland | 40 45 34 N | 082 35 25 W |
| Petit Cemetery | Cemetery | 414 | Richland | 40 45 56 N | 082 27 18 W |
| Rich Hill | Summit | 414 | Knox | 40 19 29 N | 082 43 28 W |
| Saint Johns Roman Catholic Cemetery | Cemetery | 414 | Monroe | 39 50 15 N | 081 10 31 W |
| Sparta | Populated Place | 414 | Morrow | 40 23 41 N | 082 42 02 W |
| Sparta Post Office | Post Office | 414 | Morrow | 40 23 41 N | 082 42 01 W |
| Sterkel Park | Park | 414 | Richland | 40 44 16 N | 082 31 23 W |
| The Upper Lake | Reservoir | 414 | Logan | 40 21 42 N | 083 41 60 W |
| Township of North Bloomfield | Civil | 414 | Morrow | 40 39 48 N | 082 44 09 W |
| Westland Church | Church | 414 | Logan | 40 17 28 N | 083 39 27 W |
| Friendship Church | Church | 413 | Knox | 40 22 42 N | 082 34 30 W |
| Mount Vernon Church | Church | 413 | Monroe | 39 42 44 N | 080 51 49 W |
| Ontario United Methodist Church | Church | 413 | Richland | 40 45 38 N | 082 38 31 W |
| Pleasant Hill School (historical) | School | 413 | Morrow | 40 39 11 N | 082 42 31 W |
| Saint Johns Church | Church | 413 | Monroe | 39 50 15 N | 081 10 32 W |
| Township of Springfield | Civil | 413 | Richland | 40 46 07 N | 082 37 22 W |
| Vermillion Church | Church | 413 | Ashland | 40 44 00 N | 082 19 11 W |
| WVNO-FM (Mansfield) | Tower | 413 | Richland | 40 45 38 N | 082 37 01 W |
| Church of Christ (historical) | Church | 412 | Richland | 40 44 49 N | 082 31 01 W |
| Fellowship Baptist Church | Church | 412 | Richland | 40 44 49 N | 082 31 01 W |
| Ontario Cemetery | Cemetery | 412 | Richland | 40 45 38 N | 082 38 26 W |
| Pet Cemetery | Cemetery | 412 | Richland | 40 45 35 N | 082 36 44 W |
| Shauck Post Office | Post Office | 412 | Morrow | 40 37 15 N | 082 39 45 W |
| Union Chapel | Church | 412 | Logan | 40 14 47 N | 083 37 46 W |
| Westbrook Country Club | Locale | 412 | Richland | 40 46 54 N | 082 32 16 W |
| Calvary Christian School | School | 411 | Logan | 40 22 31 N | 083 45 07 W |
| Center Corners | Locale | 411 | Morrow | 40 30 11 N | 082 40 28 W |
| Cook Road Baptist Church | Church | 411 | Richland | 40 43 58 N | 082 30 41 W |
| Fairview School (historical) | School | 411 | Morrow | 40 24 07 N | 082 43 55 W |
| Jackson School (historical) | School | 411 | Morrow | 40 21 45 N | 082 41 23 W |
| Kelker Post Office (historical) | Post Office | 411 | Morrow | 40 36 40 N | 082 44 50 W |
| Kellker (historical) | Populated Place | 411 | Morrow | 40 36 42 N | 082 44 51 W |
| Pulaskiville | Populated Place | 411 | Morrow | 40 32 02 N | 082 42 37 W |
| Pulaskiville Cemetery | Cemetery | 411 | Morrow | 40 32 08 N | 082 42 41 W |
| Saint Timothy Lutheran Church | Church | 411 | Richland | 40 46 46 N | 082 28 07 W |
| Sand Ridge Church | Church | 411 | Ashland | 40 34 53 N | 082 18 34 W |
| Westbrook Heliport | Airport | 411 | Richland | 40 46 55 N | 082 32 19 W |
| Wooster Heights Elementary School | School | 411 | Richland | 40 46 18 N | 082 27 47 W |
| Culp Cemetery | Cemetery | 410 | Richland | 40 33 56 N | 082 35 01 W |
| Culp School (historical) | School | 410 | Richland | 40 33 56 N | 082 35 07 W |
| Ebenezer Cemetery | Cemetery | 410 | Belmont | 40 00 58 N | 081 05 23 W |
| Five Corners | Populated Place | 410 | Richland | 40 46 45 N | 082 39 08 W |
| Harmon Ridge | Ridge | 410 | Monroe | 39 43 19 N | 080 55 54 W |
| Kelsey Post Office (historical) | Post Office | 410 | Belmont | 39 57 50 N | 080 54 54 W |
| Mary Rutan Heliport | Airport | 410 | Logan | 40 22 38 N | 083 45 15 W |
| Oakland School (historical) | School | 410 | Richland | 40 40 51 N | 082 32 57 W |
| Peace Church | Church | 410 | Morrow | 40 39 10 N | 082 44 31 W |
| Peace Reformed Cemetery | Cemetery | 410 | Morrow | 40 39 11 N | 082 44 29 W |
| Shauck | Populated Place | 410 | Morrow | 40 37 15 N | 082 39 43 W |
| Willow Lake | Lake | 410 | Morrow | 40 21 18 N | 082 41 37 W |
| WPKO-FM (Bellefontaine) | Tower | 410 | Logan | 40 17 10 N | 083 41 30 W |
| Ahrens Lake | Reservoir | 409 | Richland | 40 43 30 N | 082 39 60 W |
| Ahrens Lake Dam | Dam | 409 | Richland | 40 43 30 N | 082 39 60 W |
| Boltz Ridge | Ridge | 409 | Monroe | 39 48 17 N | 080 52 04 W |
| Brinkerhoff Elementary School | School | 409 | Richland | 40 45 08 N | 082 32 27 W |
| Case Ridge | Ridge | 409 | Monroe | 39 48 28 N | 080 53 35 W |
| County Line Cemetery | Cemetery | 409 | Ashland | 40 43 05 N | 082 13 20 W |
| Craley School (historical) | School | 409 | Morrow | 40 38 15 N | 082 41 23 W |
| Darlngton Post Office (historical) | Post Office | 409 | Richland | 40 35 10 N | 082 36 15 W |
| Derthick Hill | Summit | 409 | Portage | 41 18 32 N | 081 09 35 W |
| Forest School (historical) | School | 409 | Richland | 40 37 27 N | 082 28 25 W |
| Gibson Cemetery | Cemetery | 409 | Belmont | 40 01 00 N | 081 12 39 W |
| Kelsey (historical) | Populated Place | 409 | Belmont | 39 57 52 N | 080 54 54 W |
| King Cemetery | Cemetery | 409 | Columbiana | 40 48 59 N | 080 57 13 W |
| Maple Hill Cemetery | Cemetery | 409 | Geauga | 41 30 01 N | 081 14 41 W |
| Middletown | Populated Place | 409 | Champaign | 40 11 30 N | 083 37 09 W |
| Mount Vernon Cemetery | Cemetery | 409 | Monroe | 39 42 43 N | 080 51 48 W |