Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Pine Gap | Populated Place | 209 | Adams | 38 57 24 N | 083 18 51 W |
| Pine Hill | Summit | 332 | Adams | 38 59 58 N | 083 20 56 W |
| Pleasant Valley | Valley | | Adams | 38 59 22 N | 083 20 01 W |
| Pleasant Valley School (historical) | School | 224 | Adams | 39 00 18 N | 083 20 13 W |
| Plum Run | Stream | | Adams | 38 56 33 N | 083 21 28 W |
| Point Cemetery | Cemetery | 165 | Adams | 38 40 22 N | 083 22 53 W |
| Poker Hollow | Valley | | Adams | 38 55 55 N | 083 16 35 W |
| Polk Hollow | Valley | | Adams | 38 53 47 N | 083 27 32 W |
| Pollard School (historical) | School | 281 | Adams | 38 41 23 N | 083 38 42 W |
| Potato Knob | Summit | 349 | Adams | 39 02 23 N | 083 20 60 W |
| Powers Landing | Locale | 150 | Adams | 38 37 05 N | 083 19 12 W |
| Praise and Worship Church | Church | 250 | Adams | 38 56 56 N | 083 24 11 W |
| Pumpkin Ridge Cemetery | Cemetery | 293 | Adams | 38 47 21 N | 083 32 48 W |
| Puntenney Cemetery | Cemetery | 188 | Adams | 38 42 14 N | 083 23 14 W |
| Puntenney Run | Stream | | Adams | 38 41 48 N | 083 22 50 W |
| Quicks Run Light | Locale | 253 | Adams | 38 40 01 N | 083 30 01 W |
| Quinn Chapel | Church | 305 | Adams | 38 43 34 N | 083 32 55 W |
| Quinn Chapel Cemetery | Cemetery | 305 | Adams | 38 43 32 N | 083 32 58 W |
| Randall Run | Stream | | Adams | 38 46 30 N | 083 21 43 W |
| Ravenscroft Chapel | Church | 169 | Adams | 38 38 23 N | 083 40 14 W |
| Red Rock Cincinnati Museum of Natural History Nature Preserve | Park | 271 | Adams | 38 44 50 N | 083 27 27 W |
| Rock Run | Stream | | Adams | 38 36 56 N | 083 16 12 W |
| Rockville | Populated Place | 156 | Adams | 38 37 01 N | 083 16 18 W |
| Rogers Hollow | Valley | | Adams | 38 48 35 N | 083 19 03 W |
| Rogers Landing | Locale | 151 | Adams | 38 38 54 N | 083 38 28 W |
| Rogers Run | Stream | | Adams | 38 48 31 N | 083 18 45 W |
| Rome Boat Launch Ramp | Locale | 153 | Adams | 38 39 48 N | 083 22 54 W |
| Rose Hill School | School | 242 | Adams | 38 57 23 N | 083 28 12 W |
| Roush School (historical) | School | 275 | Adams | 38 42 56 N | 083 37 35 W |
| Rube Hollow | Valley | | Adams | 38 41 17 N | 083 18 41 W |
| Russell Fork Stout Creek | Stream | | Adams | 38 40 26 N | 083 22 52 W |
| Russell School (historical) | School | 178 | Adams | 38 41 42 N | 083 24 27 W |
| Saint Josephs Church | Church | 194 | Adams | 38 46 39 N | 083 19 57 W |
| Saint Marys Roman Catholic Church | Church | 167 | Adams | 38 41 32 N | 083 36 26 W |
| Sandy Springs | Populated Place | 178 | Adams | 38 36 40 N | 083 17 49 W |
| Sandy Springs Cemetery | Cemetery | 185 | Adams | 38 36 45 N | 083 17 51 W |
| Sandy Springs Landing | Locale | 151 | Adams | 38 36 17 N | 083 18 46 W |
| Sandy Springs Post Office (historical) | Post Office | 178 | Adams | 38 36 40 N | 083 17 49 W |
| Satterfield Cemetery | Cemetery | 265 | Adams | 38 47 07 N | 083 28 46 W |
| Satterfield Chapel | Church | 277 | Adams | 38 47 57 N | 083 28 59 W |
| School Number 4 (historical) | School | 287 | Adams | 38 44 21 N | 083 39 05 W |
| Scott School (historical) | School | 168 | Adams | 38 42 19 N | 083 36 07 W |
| Scrub Ridge | Populated Place | 263 | Adams | 38 52 01 N | 083 23 35 W |
| Seaman | Populated Place | 276 | Adams | 38 56 31 N | 083 34 21 W |
| Seaman Elementary School | School | 279 | Adams | 38 56 13 N | 083 34 20 W |
| Seaman Post Office | Post Office | 279 | Adams | 38 56 29 N | 083 34 26 W |
| Selig | Populated Place | 232 | Adams | 38 44 25 N | 083 21 12 W |
| Semple Creek | Stream | | Adams | 38 48 50 N | 083 25 18 W |
| Serpent Mound | Summit | 230 | Adams | 39 01 25 N | 083 25 53 W |
| Serpent Mound Mission | Church | 234 | Adams | 39 00 41 N | 083 24 28 W |
| Serpent Mound State Memorial | Park | 240 | Adams | 39 01 27 N | 083 25 47 W |
| Shamrock Landing | Locale | 149 | Adams | 38 38 37 N | 083 20 10 W |
| Shawnee Creek | Stream | | Adams | 38 49 15 N | 083 17 38 W |
| Shawnee School (historical) | School | 198 | Adams | 38 48 49 N | 083 17 25 W |
| Shawnee State Wilderness | Reserve | 305 | Adams | 38 41 15 N | 083 16 15 W |
| Shawnee Valley | Valley | | Adams | 38 49 04 N | 083 17 35 W |
| Shawnee Valley Church | Church | 212 | Adams | 38 48 44 N | 083 17 25 W |
| Shimer Run | Stream | | Adams | 38 56 57 N | 083 26 59 W |
| Shinns Landing | Locale | 152 | Adams | 38 37 43 N | 083 39 35 W |
| Silver Mine Hollow | Valley | | Adams | 38 42 04 N | 083 18 21 W |
| Sink Hole Hollow | Valley | | Adams | 38 56 39 N | 083 18 16 W |
| Slate Fork Churn Creek | Stream | | Adams | 38 44 02 N | 083 18 15 W |
| Smoky Corners | Populated Place | 247 | Adams | 39 01 18 N | 083 21 25 W |
| Smoky Corners School (historical) | School | 249 | Adams | 39 01 18 N | 083 21 27 W |
| Smoky Creek | Stream | | Adams | 38 40 02 N | 083 24 35 W |
| Snake Hollow | Valley | | Adams | 38 57 58 N | 083 16 22 W |
| Sodom School (historical) | School | 263 | Adams | 38 48 38 N | 083 40 18 W |
| Soldiers Run | Stream | | Adams | 38 46 39 N | 083 27 12 W |
| Southdown Fork Stout Run | Stream | | Adams | 38 42 14 N | 083 22 16 W |
| Spencer Hill | Summit | 336 | Adams | 38 51 32 N | 083 36 41 W |
| Spires Airport | Airport | 249 | Adams | 38 48 14 N | 083 24 26 W |
| Spires Hollow | Valley | | Adams | 38 48 51 N | 083 18 47 W |
| Spoon River | Stream | | Adams | 38 56 04 N | 083 28 48 W |
| Spring Run | Stream | | Adams | 38 40 53 N | 083 28 27 W |
| Squirrel Town | Populated Place | 170 | Adams | 38 41 50 N | 083 22 46 W |
| Star School (historical) | School | 280 | Adams | 38 40 24 N | 083 40 38 W |
| Steam Furnace | Populated Place | 256 | Adams | 38 54 21 N | 083 24 30 W |
| Steam Furnace Cemetery | Cemetery | 256 | Adams | 38 54 32 N | 083 24 28 W |
| Steam Furnace School (historical) | School | 255 | Adams | 38 54 31 N | 083 24 27 W |
| Step Church | Church | 352 | Adams | 38 43 02 N | 083 18 13 W |
| Step Church Cemetery | Cemetery | 355 | Adams | 38 43 01 N | 083 18 11 W |
| Stevensons Landing | Locale | 151 | Adams | 38 40 34 N | 083 27 60 W |
| Stocking Leg Hollow | Valley | | Adams | 38 38 43 N | 083 19 08 W |
| Stone Branch | Stream | | Adams | 38 56 58 N | 083 22 24 W |
| Stone Chapel | Church | 266 | Adams | 38 48 08 N | 083 27 52 W |
| Stone Chapel Cemetery | Cemetery | 266 | Adams | 38 48 09 N | 083 27 52 W |
| Stonewall Grange Hall | Building | 269 | Adams | 38 48 27 N | 083 27 49 W |
| Stony Hollow | Valley | | Adams | 38 46 29 N | 083 42 29 W |
| Stout | Populated Place | 158 | Adams | 38 39 50 N | 083 22 45 W |
| Stout Cemetery | Cemetery | 153 | Adams | 38 39 56 N | 083 23 12 W |
| Stout Post Office | Post Office | 158 | Adams | 38 39 50 N | 083 22 45 W |
| Stout Run | Stream | | Adams | 38 39 54 N | 083 23 36 W |
| Stouts Landing | Locale | 150 | Adams | 38 39 53 N | 083 23 44 W |
| Straight Fork | Stream | | Adams | 38 58 08 N | 083 16 16 W |
| Stuart Ash Pit Number 8 Dam | Dam | 158 | Adams | 38 38 06 N | 083 41 12 W |
| Stuart Ash Pit Number 8 Reservoir | Reservoir | 158 | Adams | 38 38 06 N | 083 41 12 W |
| Suck Run | Stream | | Adams | 38 46 10 N | 083 42 55 W |
| Suck Run School (historical) | School | 224 | Adams | 38 45 25 N | 083 41 43 W |
| Sugarcamp Run | Stream | | Adams | 38 38 57 N | 083 16 39 W |
| Sulphur Creek | Stream | | Adams | 38 38 08 N | 083 19 33 W |
| Sulphur Lick School (historical) | School | 158 | Adams | 38 38 24 N | 083 19 21 W |
| Sulphur Spring | Spring | 183 | Adams | 38 55 52 N | 083 17 12 W |
| Sulphur Springs Church | Church | 174 | Adams | 38 38 47 N | 083 40 56 W |
| Sunnyside School (historical) | School | 274 | Adams | 38 54 21 N | 083 35 17 W |
| Sunshine | Populated Place | 357 | Adams | 38 42 56 N | 083 18 56 W |
| Sunshine Ridge Cemetery | Cemetery | 353 | Adams | 38 43 00 N | 083 18 55 W |
| Sunshine School (historical) | School | 281 | Adams | 38 46 21 N | 083 37 60 W |
| Tater Ridge | Ridge | 292 | Adams | 38 55 05 N | 083 28 39 W |
| Tater Ridge School (historical) | School | 291 | Adams | 38 54 18 N | 083 28 60 W |
| Tener Mountain | Summit | 368 | Adams | 38 58 47 N | 083 17 44 W |