Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Lebanon United Methodist Church | Church | 301 | Morgan | 39 42 03 N | 081 43 15 W |
| Liars Corner | Populated Place | 301 | Athens | 39 23 59 N | 082 06 16 W |
| Lockhart Cemetery | Cemetery | 301 | Auglaize | 40 34 01 N | 084 04 47 W |
| Logan (historical) | Populated Place | 301 | Marion | 40 36 18 N | 083 04 25 W |
| Lookout Park | Park | 301 | Summit | 41 05 34 N | 081 30 01 W |
| Low Gap | Gap | 301 | Vinton | 39 20 30 N | 082 32 44 W |
| Macedonia | Populated Place | 301 | Summit | 41 18 49 N | 081 30 30 W |
| Madison Lake State Reserve | Park | 301 | Madison | 39 52 27 N | 083 22 31 W |
| Magnolia Airport | Airport | 301 | Stark | 40 39 35 N | 081 18 09 W |
| Manor (historical) | Populated Place | 301 | Montgomery | 39 35 22 N | 084 08 35 W |
| Maple Hill Cemetery | Cemetery | 301 | Fairfield | 39 36 02 N | 082 49 22 W |
| Maria Stein Catholic Church | Church | 301 | Mercer | 40 24 28 N | 084 28 25 W |
| Mark Street Elementary School | School | 301 | Marion | 40 35 44 N | 083 07 16 W |
| Marysville City Hall | Building | 301 | Union | 40 14 06 N | 083 21 60 W |
| Marysville Post Office | Post Office | 301 | Union | 40 14 16 N | 083 21 60 W |
| Marysville Public Library | Building | 301 | Union | 40 14 04 N | 083 22 01 W |
| McDonald School (historical) | School | 301 | Hardin | 40 32 27 N | 083 27 27 W |
| McFarland Homestead | Locale | 301 | Cuyahoga | 41 24 33 N | 081 25 19 W |
| McQuade Cemetery | Cemetery | 301 | Guernsey | 40 01 37 N | 081 25 52 W |
| Midwestern Heliport | Airport | 301 | Stark | 40 46 41 N | 081 32 04 W |
| Milford Center Cemetery | Cemetery | 301 | Union | 40 10 38 N | 083 25 37 W |
| Millers (historical) | Populated Place | 301 | Fairfield | 39 35 15 N | 082 47 08 W |
| Montgomery Elementary School | School | 301 | Ashland | 40 51 25 N | 082 15 53 W |
| Morton Junior High School | School | 301 | Montgomery | 39 53 26 N | 084 12 09 W |
| Mount Calvary Baptist Church | Church | 301 | Knox | 40 23 35 N | 082 29 14 W |
| Mount Calvary Cemetery | Cemetery | 301 | Clark | 40 00 43 N | 083 50 21 W |
| Mount Hermon School (historical) | School | 301 | Union | 40 16 01 N | 083 17 46 W |
| Mount Zion Cemetery | Cemetery | 301 | Washington | 39 26 13 N | 081 19 17 W |
| Munsville (historical) | Populated Place | 301 | Coshocton | 40 20 32 N | 081 48 01 W |
| Muzzys Lake | Lake | 301 | Champaign | 40 06 10 N | 083 47 01 W |
| Myers Cemetery | Cemetery | 301 | Preble | 39 46 39 N | 084 33 29 W |
| Nimisila Reservoir | Reservoir | 301 | Summit | 40 55 41 N | 081 31 38 W |
| Northridge Alexandria Elementary School | School | 301 | Licking | 40 05 29 N | 082 36 47 W |
| Oak Creek School | School | 301 | Montgomery | 39 39 55 N | 084 07 23 W |
| Oakwood | Populated Place | 301 | Montgomery | 39 43 31 N | 084 10 27 W |
| Old Loramie Valley Cemetery | Cemetery | 301 | Shelby | 40 27 10 N | 084 10 43 W |
| Old Pioneer Cemetery | Cemetery | 301 | Stark | 40 40 08 N | 081 15 22 W |
| Old Washington Elementary School | School | 301 | Guernsey | 40 02 19 N | 081 26 27 W |
| Oliver Tunnel | Tunnel | 301 | Jefferson | 40 17 28 N | 080 43 23 W |
| Oran Christian Cemetery | Cemetery | 301 | Shelby | 40 17 28 N | 084 19 19 W |
| Our Lady of Lourdes Church | Church | 301 | Huron | 41 05 03 N | 082 23 53 W |
| Pasadena | Populated Place | 301 | Montgomery | 39 41 57 N | 084 08 55 W |
| Pennsville | Populated Place | 301 | Morgan | 39 34 31 N | 081 51 19 W |
| Piqua Airport | Airport | 301 | Miami | 40 09 52 N | 084 18 30 W |
| Pisgah Cemetery | Cemetery | 301 | Greene | 39 45 23 N | 084 03 16 W |
| Pleasant Valley Church | Church | 301 | Harrison | 40 19 52 N | 081 08 56 W |
| Presbyterian Cemetery | Cemetery | 301 | Perry | 39 39 29 N | 082 07 12 W |
| Quickstep Pentecostal Church of God | Church | 301 | Hardin | 40 39 35 N | 083 50 30 W |
| Ransom | Populated Place | 301 | Preble | 39 44 39 N | 084 34 51 W |
| Reed Cemetery | Cemetery | 301 | Stark | 40 42 14 N | 081 35 24 W |
| Richland School (historical) | School | 301 | Brown | 39 14 26 N | 083 57 59 W |
| Rock Mills Cemetery | Cemetery | 301 | Fayette | 39 26 27 N | 083 24 06 W |
| Saint Hedwigs Catholic Church | Church | 301 | Summit | 41 05 46 N | 081 30 31 W |
| Saint Johns Cemetery | Cemetery | 301 | Auglaize | 40 31 03 N | 084 08 42 W |
| Saint Johns Church | Church | 301 | Marion | 40 29 57 N | 082 59 44 W |
| Saint Johns Lutheran Church | Church | 301 | Ashland | 40 39 26 N | 082 18 34 W |
| Saint Marys Byzantine Catholic Church | Church | 301 | Mahoning | 41 05 42 N | 080 41 22 W |
| Saint Paul Lutheran Church | Church | 301 | Stark | 40 40 07 N | 081 15 50 W |
| Saint Peter and Paul Church | Church | 301 | Shelby | 40 17 46 N | 084 22 09 W |
| Saints Peter and Paul Seminary | School | 301 | Licking | 39 59 56 N | 082 29 14 W |
| Scatter Ridge | Ridge | 301 | Athens | 39 21 26 N | 082 00 53 W |
| Schocalog Lake | Reservoir | 301 | Summit | 41 06 21 N | 081 36 24 W |
| School Number 1 (historical) | School | 301 | Montgomery | 39 40 50 N | 084 07 29 W |
| School Number 8 (historical) | School | 301 | Crawford | 40 53 32 N | 082 54 08 W |
| Shawnee High School | School | 301 | Preble | 39 37 37 N | 084 33 20 W |
| Shawnee Middle School | School | 301 | Preble | 39 37 38 N | 084 33 16 W |
| Sheridan High School | School | 301 | Perry | 39 49 32 N | 082 22 35 W |
| Shirver Park | Park | 301 | Stark | 40 46 58 N | 081 30 46 W |
| Shockey Cemetery | Cemetery | 301 | Champaign | 40 04 35 N | 083 49 20 W |
| Silver Lake | Lake | 301 | Summit | 41 09 23 N | 081 27 34 W |
| South Radnor Cemetery | Cemetery | 301 | Delaware | 40 18 36 N | 083 08 03 W |
| Sugarbush Golf Course | Locale | 301 | Portage | 41 17 52 N | 081 05 41 W |
| Sulphurgrove Post Office (historical) | Post Office | 301 | Montgomery | 39 51 40 N | 084 06 15 W |
| Tabernacle Baptist Church | Church | 301 | Summit | 41 05 01 N | 081 34 32 W |
| Tappan Cemetery | Cemetery | 301 | Harrison | 40 21 29 N | 081 12 27 W |
| Teacup Cemetery | Cemetery | 301 | Darke | 40 19 30 N | 084 32 16 W |
| The Church on 94 | Church | 301 | Wayne | 40 57 09 N | 081 46 57 W |
| Todds Post Office (historical) | Post Office | 301 | Morgan | 39 31 30 N | 081 50 49 W |
| Township of Marion | Civil | 301 | Marion | 40 35 34 N | 083 07 16 W |
| Township of Paint | Civil | 301 | Fayette | 39 37 29 N | 083 24 19 W |
| Township of Recovery | Civil | 301 | Mercer | 40 25 45 N | 084 45 12 W |
| Township of Union | Civil | 301 | Tuscarawas | 40 26 08 N | 081 18 54 W |
| Triadelphia Methodist Church | Church | 301 | Morgan | 39 41 59 N | 081 57 60 W |
| Trinity Assembly of God Church | Church | 301 | Knox | 40 23 39 N | 082 29 45 W |
| Trinity Hall | Building | 301 | Jefferson | 40 22 32 N | 080 37 03 W |
| Trumbull | Populated Place | 301 | Ashtabula | 41 40 41 N | 080 57 14 W |
| Turkeyfoot Beach | Beach | 301 | Summit | 40 58 08 N | 081 32 43 W |
| Union County Sports Complex | Park | 301 | Union | 40 15 52 N | 083 20 54 W |
| Unionport | Populated Place | 301 | Jefferson | 40 21 29 N | 080 50 44 W |
| Vandalia Baptist Temple | Church | 301 | Montgomery | 39 52 56 N | 084 12 30 W |
| Versailles High School | School | 301 | Darke | 40 13 04 N | 084 28 60 W |
| Veterans Memorial Coliseum | Building | 301 | Marion | 40 36 15 N | 083 07 28 W |
| Veterans Memorial Park | Park | 301 | Hardin | 40 38 29 N | 083 34 31 W |
| Wacker Heights | Populated Place | 301 | Fairfield | 39 44 35 N | 082 34 42 W |
| Walker Chapel Cemetery | Cemetery | 301 | Butler | 39 27 28 N | 084 48 25 W |
| Walnut Creek Mennonite Church | Church | 301 | Holmes | 40 31 49 N | 081 42 57 W |
| Washington Court House Reservoir | Reservoir | 301 | Fayette | 39 32 30 N | 083 27 24 W |
| Washington Court House Reservoir Dam | Dam | 301 | Fayette | 39 32 30 N | 083 27 24 W |
| Waters Cemetery | Cemetery | 301 | Brown | 38 55 30 N | 083 42 46 W |
| WBBG-FM (Youngstown) | Tower | 301 | Mahoning | 41 04 50 N | 080 38 53 W |
| WBBW-AM (Youngstown) | Tower | 301 | Mahoning | 41 04 50 N | 080 38 53 W |
| Weitzel School (historical) | School | 301 | Morgan | 39 39 02 N | 081 55 02 W |
| Welsh Hill Cemetery | Cemetery | 301 | Trumbull | 41 08 08 N | 080 43 41 W |
| Welty Cemetery | Cemetery | 301 | Stark | 40 41 08 N | 081 35 55 W |
| West Market Place Shopping Center | Locale | 301 | Summit | 41 06 38 N | 081 34 36 W |
| Weston Cemetery | Cemetery | 301 | Morrow | 40 31 07 N | 082 56 38 W |
| Weston School (historical) | School | 301 | Morrow | 40 31 07 N | 082 56 37 W |
| WKFI-AM (Wilmington) | Tower | 301 | Clinton | 39 26 12 N | 083 51 21 W |
| Wright Park | Park | 301 | Montgomery | 39 42 56 N | 084 10 18 W |
| Adams County Hospital | Hospital | 300 | Adams | 38 47 39 N | 083 32 08 W |