Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Newville Church | Church | 328 | Richland | 40 37 48 N | 082 24 19 W |
| Newville Post Office (historical) | Post Office | 322 | Richland | 40 37 50 N | 082 23 10 W |
| North Central Technical College | School | 391 | Richland | 40 47 49 N | 082 34 45 W |
| North Lake Park | Park | 363 | Richland | 40 46 01 N | 082 32 16 W |
| Oak Hall School (historical) | School | 376 | Richland | 40 37 26 N | 082 25 47 W |
| Oakland Lutheran Church | Church | 402 | Richland | 40 48 51 N | 082 29 26 W |
| Oakland School (historical) | School | 410 | Richland | 40 40 51 N | 082 32 57 W |
| Odd Fellows Cemetery | Cemetery | 364 | Richland | 40 42 17 N | 082 26 15 W |
| Ohio State Reformatory | Building | 372 | Richland | 40 47 07 N | 082 30 07 W |
| Ohio State Reformatory Cemetery | Cemetery | 370 | Richland | 40 47 15 N | 082 30 11 W |
| Ohio State University | School | 387 | Richland | 40 47 58 N | 082 34 52 W |
| Old Center Cemetery | Cemetery | 417 | Richland | 40 36 04 N | 082 37 27 W |
| Old Salem Cemetery | Cemetery | 345 | Richland | 40 58 31 N | 082 34 60 W |
| Olivesburg | Populated Place | 328 | Richland | 40 53 09 N | 082 25 44 W |
| Olivesburg Post Office (historical) | Post Office | 327 | Richland | 40 53 10 N | 082 25 45 W |
| Ontario | Populated Place | 414 | Richland | 40 45 34 N | 082 35 25 W |
| Ontario Cemetery | Cemetery | 412 | Richland | 40 45 38 N | 082 38 26 W |
| Ontario High School | School | 423 | Richland | 40 45 53 N | 082 38 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 |
| Ontario United Methodist Church | Church | 413 | Richland | 40 45 38 N | 082 38 31 W |
| Oswalt Aerodrome Airport | Airport | 364 | Richland | 40 55 12 N | 082 28 45 W |
| Painter Cemetery | Cemetery | 366 | Richland | 40 46 12 N | 082 29 49 W |
| Palmer Spring | Spring | 405 | Richland | 40 46 47 N | 082 39 22 W |
| Park Avenue Baptist Church | Church | 393 | Richland | 40 45 33 N | 082 31 35 W |
| Pavonia | Populated Place | 334 | Richland | 40 49 21 N | 082 26 10 W |
| Pavonia United Methodist Church | Church | 361 | Richland | 40 49 27 N | 082 26 32 W |
| Pentecostal Church | Church | 368 | Richland | 40 46 12 N | 082 31 31 W |
| Peoples Hospital | Hospital | 359 | Richland | 40 45 31 N | 082 29 29 W |
| Perry Church | Church | 399 | Richland | 40 35 11 N | 082 35 41 W |
| Pet Cemetery | Cemetery | 412 | Richland | 40 45 35 N | 082 36 44 W |
| Petit Cemetery | Cemetery | 414 | Richland | 40 45 56 N | 082 27 18 W |
| Pilgrim Rest Missionary Baptist Church | Church | 356 | Richland | 40 46 22 N | 082 30 23 W |
| Pilgrim Tabernacle | Church | 374 | Richland | 40 46 18 N | 082 31 38 W |
| Pine Run | Stream | | Richland | 40 36 22 N | 082 15 29 W |
| Pine Run Cemetery | Cemetery | 372 | Richland | 40 34 47 N | 082 21 37 W |
| Pinhook | Populated Place | 388 | Richland | 40 40 56 N | 082 22 42 W |
| Pioneer Rest Cemetery | Cemetery | 309 | Richland | 40 59 27 N | 082 40 02 W |
| Pittenger Cemetery | Cemetery | 378 | Richland | 40 49 48 N | 082 29 05 W |
| Planktown | Populated Place | 327 | Richland | 40 57 27 N | 082 35 09 W |
| Pleasant Grove Cemetery | Cemetery | 365 | Richland | 40 46 56 N | 082 25 38 W |
| Pleasant Grove Church | Church | 383 | Richland | 40 36 28 N | 082 35 12 W |
| Pleasant Grove Evangelical Cemetery | Cemetery | 385 | Richland | 40 36 29 N | 082 35 14 W |
| Pleasant Hall School (historical) | School | 373 | Richland | 40 38 52 N | 082 28 20 W |
| Pleasant Hill Cemetery | Cemetery | 386 | Richland | 40 44 27 N | 082 38 47 W |
| Pleasant Hill Lake Park | Park | 327 | Richland | 40 38 56 N | 082 20 31 W |
| Pleasant Hill Landing Strip | Airport | 312 | Richland | 40 38 40 N | 082 20 58 W |
| Pleasant Hill Marina | Locale | 311 | Richland | 40 38 36 N | 082 20 41 W |
| Pleasant Hill School (historical) | School | 402 | Richland | 40 35 41 N | 082 32 55 W |
| Pleasant Valley Baptist Cemetery | Cemetery | 345 | Richland | 40 51 02 N | 082 30 49 W |
| Pleasant Valley Cemetery | Cemetery | 352 | Richland | 40 39 34 N | 082 24 14 W |
| Pleasant Valley Church | Church | 349 | Richland | 40 39 33 N | 082 24 18 W |
| Pleasant Valley Church | Church | 345 | Richland | 40 51 01 N | 082 30 48 W |
| Pleasant Valley Run | Stream | | Richland | 40 34 33 N | 082 26 14 W |
| Pleasant Valley School (historical) | School | 352 | Richland | 40 33 53 N | 082 25 59 W |
| Plymouth Post Office | Post Office | 308 | Richland | 40 59 42 N | 082 39 55 W |
| Possum Run | Stream | | Richland | 40 37 37 N | 082 23 02 W |
| Possum Run Golf Course | Locale | 407 | Richland | 40 43 16 N | 082 30 37 W |
| Presbyterian Cemetery | Cemetery | 336 | Richland | 40 55 55 N | 082 32 13 W |
| Prospect Elementary School | School | 417 | Richland | 40 44 44 N | 082 31 11 W |
| Prospect Park | Park | 419 | Richland | 40 44 37 N | 082 31 11 W |
| Providence Baptist Church | Church | 353 | Richland | 40 45 55 N | 082 31 10 W |
| Rall Field | Airport | 401 | Richland | 40 45 40 N | 082 25 05 W |
| Ralston Knob | Summit | 430 | Richland | 40 46 46 N | 082 38 12 W |
| Ranchwood Elementary School | School | 433 | Richland | 40 43 53 N | 082 31 40 W |
| Red Brush School (historical) | School | 341 | Richland | 40 35 42 N | 082 28 18 W |
| Red Squirrel Cemetery | Cemetery | 397 | Richland | 40 43 54 N | 082 41 23 W |
| Rheinhart School (historical) | School | 400 | Richland | 40 33 53 N | 082 37 25 W |
| Riblet (historical) | Populated Place | 384 | Richland | 40 45 30 N | 082 41 55 W |
| Riblet Cemetery | Cemetery | 396 | Richland | 40 45 39 N | 082 41 19 W |
| Riblets Post Office (historical) | Post Office | 384 | Richland | 40 45 30 N | 082 41 55 W |
| Richland (historical) | Populated Place | 372 | Richland | 40 48 34 N | 082 37 43 W |
| Richland Church | Church | 358 | Richland | 40 51 00 N | 082 32 31 W |
| Richland Cottage Area | Populated Place | 330 | Richland | 40 38 48 N | 082 21 10 W |
| Richland County | Civil | 393 | Richland | 40 47 00 N | 082 33 00 W |
| Richland County Courthouse | Building | 375 | Richland | 40 45 29 N | 082 30 50 W |
| Richland County Home | Building | 340 | Richland | 40 50 29 N | 082 28 05 W |
| Richland County Law Library | Building | 375 | Richland | 40 45 29 N | 082 30 50 W |
| Richland Hospital | Hospital | 357 | Richland | 40 44 38 N | 082 27 46 W |
| Richland Mall Shopping Center | Locale | 423 | Richland | 40 46 13 N | 082 35 37 W |
| Robinson Run | Stream | | Richland | 40 35 41 N | 082 29 37 W |
| Rocky Fork | Stream | | Richland | 40 41 55 N | 082 21 38 W |
| Rome | Populated Place | 338 | Richland | 40 55 35 N | 082 31 49 W |
| Roseland | Populated Place | 372 | Richland | 40 47 19 N | 082 32 34 W |
| Roseland Elementary School | School | 397 | Richland | 40 46 49 N | 082 33 10 W |
| Sacred Heart of Jesus Church | Church | 345 | Richland | 40 50 12 N | 082 43 25 W |
| Sacred Heart Seminary | Church | 369 | Richland | 40 49 48 N | 082 36 05 W |
| Saint James School (historical) | School | 357 | Richland | 40 44 28 N | 082 26 11 W |
| Saint John Cemetery | Cemetery | 314 | Richland | 40 38 44 N | 082 20 58 W |
| Saint Johns (historical) | Populated Place | 316 | Richland | 40 38 45 N | 082 20 52 W |
| Saint Johns United Church of Christ | Church | 372 | Richland | 40 45 29 N | 082 30 47 W |
| Saint Josephs Cemetery | Cemetery | 357 | Richland | 40 47 12 N | 082 43 18 W |
| Saint Lukes Lutheran Church | Church | 393 | Richland | 40 45 31 N | 082 31 28 W |
| Saint Marks Episcopal Church | Church | 337 | Richland | 40 52 57 N | 082 39 42 W |
| Saint Marys Catholic Church | Church | 357 | Richland | 40 46 10 N | 082 30 23 W |
| Saint Marys School | School | 357 | Richland | 40 46 10 N | 082 30 25 W |
| Saint Marys School | School | 399 | Richland | 40 47 12 N | 082 27 13 W |
| Saint Matthews Lutheran Church | Church | 393 | Richland | 40 45 42 N | 082 31 52 W |
| Saint Paul Lutheran Church | Church | 348 | Richland | 40 37 12 N | 082 30 48 W |
| Saint Pauls Lutheran Church | Church | 377 | Richland | 40 45 36 N | 082 31 09 W |
| Saint Peter School | School | 389 | Richland | 40 45 23 N | 082 31 10 W |
| Saint Peters Catholic Church | Church | 387 | Richland | 40 45 24 N | 082 31 08 W |
| Saint Peters Church | Church | 339 | Richland | 40 53 09 N | 082 37 17 W |
| Saint Peters Evangelical Lutheran Church | Church | 355 | Richland | 40 46 05 N | 082 30 02 W |
| Saint Timothy Lutheran Church | Church | 411 | Richland | 40 46 46 N | 082 28 07 W |
| Salem Cemetery | Cemetery | 356 | Richland | 40 37 27 N | 082 33 29 W |
| Salem Church | Church | 382 | Richland | 40 33 27 N | 082 21 60 W |
| Sandy Hill School (historical) | School | 420 | Richland | 40 42 45 N | 082 32 58 W |
| School Number 1 (historical) | School | 342 | Richland | 40 52 40 N | 082 41 46 W |
| School Number 1 (historical) | School | 397 | Richland | 40 47 52 N | 082 35 26 W |