Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Tropic Station (historical) | Locale | 233 | Morgan | 39 44 20 N | 082 04 36 W |
| Trots School (historical) | School | 372 | Noble | 39 49 27 N | 081 19 37 W |
| Trotter Cemetery | Cemetery | 187 | Gallia | 38 42 30 N | 082 16 25 W |
| Trotter School (historical) | School | 200 | Adams | 38 46 03 N | 083 31 17 W |
| Trotters Creek | Stream | | Miami | 40 08 32 N | 084 21 21 W |
| Trotwood | Populated Place | 256 | Montgomery | 39 47 50 N | 084 18 41 W |
| Trotwood Church of the Brethren | Church | 253 | Montgomery | 39 47 50 N | 084 18 26 W |
| Trotwood Community Park | Park | 258 | Montgomery | 39 47 36 N | 084 18 52 W |
| Trotwood Industrial Park | Locale | 247 | Montgomery | 39 47 41 N | 084 17 22 W |
| Trotwood Main Shopping Center | Locale | 250 | Montgomery | 39 47 46 N | 084 17 53 W |
| Trotwood Post Office | Post Office | 256 | Montgomery | 39 47 51 N | 084 18 41 W |
| Trotwood Post Office (historical) | Post Office | 256 | Montgomery | 39 47 50 N | 084 18 40 W |
| Trotwood United Church of Christ | Church | 258 | Montgomery | 39 47 57 N | 084 18 41 W |
| Trotwood-Madison High School | School | 267 | Montgomery | 39 47 23 N | 084 18 30 W |
| Trotwood-Madison Junior High School | School | 266 | Montgomery | 39 47 23 N | 084 18 37 W |
| Trouble Creek | Stream | | Meigs | 39 00 11 N | 081 49 37 W |
| Trough Run | Stream | | Belmont | 40 00 44 N | 080 46 44 W |
| Trout School (historical) | School | 323 | Highland | 39 02 08 N | 083 34 29 W |
| Troutman Hall | Building | 238 | Franklin | 39 57 20 N | 082 56 12 W |
| Troutwine Cemetery | Cemetery | 306 | Highland | 39 13 41 N | 083 50 08 W |
| Trowbridge | Populated Place | 180 | Ottawa | 41 34 48 N | 083 16 52 W |
| Trowbridge Post Office (historical) | Post Office | 179 | Ottawa | 41 34 50 N | 083 16 50 W |
| Troxel Cemetery | Cemetery | 229 | Montgomery | 39 40 18 N | 084 18 08 W |
| Troy | Populated Place | 252 | Miami | 40 02 22 N | 084 12 12 W |
| Troy Baptist Church | Church | 351 | Geauga | 41 21 38 N | 081 06 30 W |
| Troy Cemetery | Cemetery | 185 | Athens | 39 16 07 N | 081 49 22 W |
| Troy Cemetery | Cemetery | 343 | Geauga | 41 23 10 N | 081 08 51 W |
| Troy Cemetery | Cemetery | 369 | Richland | 40 41 41 N | 082 36 37 W |
| Troy Chapel | Church | 286 | Delaware | 40 21 52 N | 083 04 29 W |
| Troy Chapel Cemetery | Cemetery | 287 | Delaware | 40 21 53 N | 083 04 28 W |
| Troy Christian School | School | 265 | Miami | 40 02 53 N | 084 13 34 W |
| Troy Church | Church | 191 | Athens | 39 16 07 N | 081 49 24 W |
| Troy Church of Christ in Christian Union | Church | 251 | Miami | 40 02 03 N | 084 11 51 W |
| Troy Church of the Brethren | Church | 266 | Miami | 40 02 58 N | 084 13 32 W |
| Troy Church School | School | 369 | Geauga | 41 24 30 N | 081 07 11 W |
| Troy City Hall | Building | 253 | Miami | 40 02 18 N | 084 12 16 W |
| Troy Country Club | Locale | 261 | Miami | 40 00 57 N | 084 13 31 W |
| Troy Elementary School | School | 377 | Geauga | 41 23 08 N | 081 08 28 W |
| Troy Farms (subdivision) | Populated Place | 290 | Delaware | 40 18 38 N | 083 06 55 W |
| Troy Gospel Tabernacle | Church | 251 | Miami | 40 01 54 N | 084 11 47 W |
| Troy High School | School | 256 | Miami | 40 02 44 N | 084 12 05 W |
| Troy Junior High School | School | 186 | Lorain | 41 29 59 N | 082 02 15 W |
| Troy Junior High School | School | 256 | Miami | 40 02 56 N | 084 11 58 W |
| Troy Low Head Dam | Dam | 248 | Miami | 40 02 24 N | 084 11 54 W |
| Troy Low Head Reservoir | Reservoir | 248 | Miami | 40 02 24 N | 084 11 54 W |
| Troy Memorial Stadium | Park | 251 | Miami | 40 02 38 N | 084 12 08 W |
| Troy Post Office | Post Office | 252 | Miami | 40 02 10 N | 084 12 20 W |
| Troy Post Office | Post Office | 252 | Miami | 40 02 20 N | 084 12 10 W |
| Troy Public Square | Park | 253 | Miami | 40 02 22 N | 084 12 13 W |
| Troy Road Shopping Center | Locale | 286 | Delaware | 40 18 26 N | 083 05 28 W |
| Troy School (historical) | School | 285 | Delaware | 40 21 46 N | 083 04 27 W |
| Troy Skypark | Airport | 282 | Miami | 39 59 27 N | 084 16 14 W |
| Troy Towne Center Shopping Center | Locale | 273 | Miami | 40 03 17 N | 084 14 10 W |
| Troy Township Cemetery | Cemetery | 195 | Wood | 41 27 08 N | 083 23 38 W |
| Troy View Church of God | Church | 261 | Miami | 40 02 35 N | 084 10 15 W |
| Troy Villa Mobile Home Park | Populated Place | 195 | Wood | 41 30 10 N | 083 27 59 W |
| Troy-Hayner Cultural Center | Building | 254 | Miami | 40 02 28 N | 084 12 23 W |
| Troy-Miami County Public Library | Building | 254 | Miami | 40 02 30 N | 084 12 27 W |
| Troyer Hollow | Valley | | Holmes | 40 29 18 N | 081 48 56 W |
| Troyer School | School | 372 | Holmes | 40 32 09 N | 081 46 43 W |
| Troyer School (historical) | School | 310 | Holmes | 40 29 35 N | 081 41 26 W |
| Troyer Valley Creek | Stream | | Holmes | 40 28 45 N | 081 39 15 W |
| Troyers Mill (historical) | Locale | 284 | Holmes | 40 30 07 N | 081 48 21 W |
| Troyton | Populated Place | 292 | Delaware | 40 23 39 N | 083 04 49 W |
| Troyton Post Office (historical) | Post Office | 292 | Delaware | 40 23 40 N | 083 04 50 W |
| Tru-Lay Stadium | Park | 177 | Ottawa | 41 30 26 N | 082 57 01 W |
| True Apostolic Church of Jesus Christ | Church | 312 | Summit | 41 03 22 N | 081 31 16 W |
| True Baptist Church | Church | 228 | Montgomery | 39 44 38 N | 084 13 37 W |
| True Cemetery | Cemetery | 250 | Athens | 39 27 12 N | 082 06 31 W |
| True Christian Missionary Baptist Church | Church | 235 | Montgomery | 39 44 54 N | 084 14 04 W |
| True Church of God | Church | 153 | Hamilton | 39 07 57 N | 084 32 01 W |
| True Church of God of Apostolic Faith | Church | 186 | Lucas | 41 39 50 N | 083 32 23 W |
| True Church of God Sanctified | Church | 187 | Lucas | 41 38 49 N | 083 34 11 W |
| True Church of Jesus Christ | Church | 168 | Hamilton | 39 06 43 N | 084 30 42 W |
| True Hall | Building | 187 | Athens | 39 19 21 N | 082 05 35 W |
| True Holiness Church of God | Church | 164 | Hamilton | 39 06 46 N | 084 31 08 W |
| True Holiness Church of God | Church | 248 | Hamilton | 39 07 06 N | 084 30 32 W |
| True Holiness Church of God | Church | 181 | Hamilton | 39 14 30 N | 084 27 09 W |
| True Holiness Church of God | Church | 201 | Hamilton | 39 15 07 N | 084 27 30 W |
| True Holiness Church of God of Silverton | Church | 255 | Hamilton | 39 11 33 N | 084 24 19 W |
| True Hollow | Valley | | Ross | 39 21 35 N | 082 51 11 W |
| True Holy Church of God and Christ | Church | 239 | Montgomery | 39 45 41 N | 084 14 12 W |
| True Holy Church of the Living God | Church | 232 | Montgomery | 39 45 17 N | 084 13 10 W |
| True Light Baptist Church | Church | 295 | Summit | 41 02 59 N | 081 32 43 W |
| True Light Pentecostal Church | Church | 186 | Lucas | 41 40 37 N | 083 33 46 W |
| True Unity Baptist Church | Church | 146 | Hamilton | 39 09 20 N | 084 32 34 W |
| True Vine Church of God in Christ | Church | 325 | Summit | 41 03 36 N | 081 29 11 W |
| True Vine Holiness Church of God | Church | 271 | Montgomery | 39 47 16 N | 084 14 23 W |
| True Vine Missionary Baptist Church | Church | 192 | Cuyahoga | 41 31 53 N | 081 36 33 W |
| True Vine Missionary Baptist Church | Church | 291 | Montgomery | 39 44 51 N | 084 16 01 W |
| True Vine Outreach Ministry | Church | 296 | Mahoning | 41 04 27 N | 080 35 51 W |
| True Way Pentecostal Church of God | Church | 156 | Hamilton | 39 05 39 N | 084 33 38 W |
| Truelight Missionary Baptist Church | Church | 161 | Hamilton | 39 06 44 N | 084 25 23 W |
| Truetown | Populated Place | 213 | Athens | 39 26 59 N | 082 06 30 W |
| Truevine Missionary Baptist Church | Church | 181 | Lucas | 41 40 35 N | 083 31 38 W |
| Truitt Hollow | Valley | | Adams | 38 44 13 N | 083 23 23 W |
| Truman Marina | Locale | 175 | Ottawa | 41 32 25 N | 082 46 09 W |
| Trumbo Cemetery | Cemetery | 165 | Lawrence | 38 33 54 N | 082 46 38 W |
| Trumbull | Populated Place | 301 | Ashtabula | 41 40 41 N | 080 57 14 W |
| Trumbull Airport | Airport | 313 | Ashtabula | 41 40 29 N | 080 58 39 W |
| Trumbull Cemetery | Cemetery | 311 | Ashtabula | 41 41 34 N | 080 57 13 W |
| Trumbull Country Club | Locale | 280 | Trumbull | 41 14 45 N | 080 46 33 W |
| Trumbull County | Civil | 276 | Trumbull | 41 19 00 N | 080 45 59 W |
| Trumbull County Childrens Home | Building | 285 | Trumbull | 41 14 08 N | 080 47 53 W |
| Trumbull County Courthouse | Building | 271 | Trumbull | 41 14 13 N | 080 49 08 W |
| Trumbull County Fairgounds | Park | 277 | Trumbull | 41 14 32 N | 080 48 13 W |
| Trumbull Creek | Stream | | Ashtabula | 41 41 36 N | 080 53 22 W |
| Trumbull Homes (subdivision) | Populated Place | 281 | Trumbull | 41 13 20 N | 080 47 36 W |
| Trumbull Memorial Hospital | Hospital | 283 | Trumbull | 41 14 10 N | 080 47 57 W |
| Trumbull Post Office (historical) | Post Office | 302 | Ashtabula | 41 40 40 N | 080 57 14 W |