Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Sandbar Beach | Beach | 428 | Dickinson | 43 29 10 N | 095 03 16 W |
| Sandbar Slough | Gut | 427 | Dickinson | 43 28 53 N | 095 03 12 W |
| Sanders Cemetery | Cemetery | 355 | Clarke | 40 58 23 N | 093 54 06 W |
| Sanders Creek | Stream | | Johnson | 41 42 08 N | 091 31 45 W |
| Sandinavian Cemetery | Cemetery | 172 | Lee | 40 28 24 N | 091 29 13 W |
| Sandpiper Hills Waterfowl Production Area | Park | 371 | Cerro Gordo | 43 14 25 N | 093 29 01 W |
| Sands Farm Cemetery | Cemetery | 297 | Delaware | 42 23 20 N | 091 22 33 W |
| Sands Timber and Recreation Area | Park | 347 | Taylor | 40 37 40 N | 094 30 11 W |
| Sandtown Cemetery | Cemetery | 192 | Johnson | 41 33 16 N | 091 30 26 W |
| Sandusky | Populated Place | 165 | Lee | 40 27 52 N | 091 23 15 W |
| Sandusky (historical) | Locale | 165 | Lee | 40 27 52 N | 091 23 15 W |
| Sandusky Cemetery | Cemetery | 175 | Lee | 40 28 05 N | 091 23 05 W |
| Sandusky Mobile Home Villa | Populated Place | 177 | Lee | 40 27 54 N | 091 23 31 W |
| Sandusky Post Office (historical) | Post Office | 165 | Lee | 40 27 52 N | 091 23 15 W |
| Sandy Beach Campground | Locale | 234 | Johnson | 41 48 47 N | 091 36 06 W |
| Sandy Beach Public Use Area | Park | 223 | Johnson | 41 48 49 N | 091 35 44 W |
| Sandy Branch | Stream | | Appanoose | 40 49 40 N | 093 03 55 W |
| Sandy Creek | Stream | | Fayette | 42 59 57 N | 091 38 22 W |
| Sandy Creek | Stream | | Wapello | 40 58 14 N | 092 28 20 W |
| Sandy Hollow Golf Course | Locale | 404 | Sioux | 43 03 55 N | 096 06 59 W |
| Sandy Hollow Recreation Area | Park | 403 | Sioux | 43 03 54 N | 096 06 59 W |
| Sandy Hook Cemetery | Cemetery | 216 | Washington | 41 12 18 N | 091 47 46 W |
| Sandy Point Bend | Bend | 305 | Harrison | 41 39 36 N | 096 05 53 W |
| Sandy Slough | Stream | | Fremont | 40 48 31 N | 095 49 55 W |
| Sandyville | Populated Place | 286 | Warren | 41 22 15 N | 093 23 11 W |
| Sandyville Cemetery | Cemetery | 281 | Warren | 41 22 33 N | 093 23 07 W |
| Sandyville Post Office (historical) | Post Office | 286 | Warren | 41 22 15 N | 093 23 11 W |
| Sanford Museum and Planetarium | Building | 364 | Cherokee | 42 45 01 N | 095 33 02 W |
| Sanford Park | Park | 342 | Woodbury | 42 30 32 N | 096 25 04 W |
| Sante Fe United Methodist Church | Church | 164 | Lee | 40 37 38 N | 091 20 52 W |
| Santee Prairie Area | Park | 441 | Dickinson | 43 25 35 N | 095 14 21 W |
| Santiago | Populated Place | 265 | Polk | 41 42 36 N | 093 22 30 W |
| Santiago (historical) | Locale | 265 | Polk | 41 42 36 N | 093 22 30 W |
| Santiago Creek | Stream | | Polk | 41 43 33 N | 093 22 21 W |
| Santiago Post Office (historical) | Post Office | 265 | Polk | 41 42 36 N | 093 22 30 W |
| Santiago United Methodist Church | Church | 267 | Polk | 41 42 28 N | 093 22 32 W |
| Sants Branch | Stream | | Warren | 41 19 14 N | 093 38 58 W |
| Sarah Dinwoodie Cemetery | Cemetery | 334 | Boone | 42 01 40 N | 093 52 11 W |
| Saratoga | Populated Place | 378 | Howard | 43 22 17 N | 092 24 22 W |
| Saratoga Cemetery | Cemetery | 336 | Hamilton | 42 21 14 N | 093 49 01 W |
| Saratoga Church | Church | 378 | Howard | 43 22 07 N | 092 24 21 W |
| Saratoga Post Office (historical) | Post Office | 333 | Hamilton | 42 31 22 N | 093 48 54 W |
| Saratoga Post Office (historical) | Post Office | 378 | Howard | 43 22 17 N | 092 24 22 W |
| Saratoga Township Cemetery | Cemetery | 378 | Howard | 43 22 18 N | 092 24 08 W |
| Saratoga Township Cemetery | Cemetery | 378 | Howard | 43 22 03 N | 092 24 08 W |
| Sargeant Farm Cemetery | Cemetery | 348 | Chickasaw | 43 10 40 N | 092 15 41 W |
| Sargent Floyd Monument Historical Marker | Park | 358 | Woodbury | 42 27 45 N | 096 22 37 W |
| Sargent Park | Park | 249 | Polk | 41 37 57 N | 093 32 51 W |
| Sargents Spur | Ridge | 289 | Mills | 40 59 14 N | 095 48 00 W |
| Sarney Post Office (historical) | Post Office | 361 | Greene | 42 11 15 N | 094 36 39 W |
| Sartori Hospital | Hospital | 285 | Black Hawk | 42 32 01 N | 092 27 27 W |
| Sartori Hospital Park | Park | 276 | Black Hawk | 42 32 05 N | 092 27 31 W |
| Sattre | Populated Place | 337 | Winneshiek | 43 23 32 N | 091 38 23 W |
| Sattre Post Office (historical) | Post Office | 337 | Winneshiek | 43 23 32 N | 091 38 23 W |
| Saude | Populated Place | 349 | Chickasaw | 43 11 53 N | 092 09 41 W |
| Saude Lutheran Cemetery | Cemetery | 360 | Chickasaw | 43 12 21 N | 092 10 01 W |
| Saude Lutheran Church | Church | 359 | Chickasaw | 43 12 21 N | 092 09 58 W |
| Saude Lutheran School | School | 351 | Chickasaw | 43 11 41 N | 092 09 36 W |
| Saude Park | Park | 343 | Chickasaw | 43 11 28 N | 092 10 11 W |
| Saude Post Office (historical) | Post Office | 349 | Chickasaw | 43 11 53 N | 092 09 41 W |
| Sauk Rail Trail | Trail | 402 | Carroll | 42 09 20 N | 094 57 56 W |
| Saulsbury Bridge Recreation Area | Park | 188 | Muscatine | 41 30 02 N | 091 10 01 W |
| Saums Cemetery | Cemetery | 286 | Jasper | 41 40 28 N | 092 53 04 W |
| Saunders Branch | Stream | | Henry | 40 56 53 N | 091 34 27 W |
| Saunders Park | Park | 207 | Henry | 40 57 44 N | 091 33 41 W |
| Saunders School | School | 218 | Henry | 40 58 06 N | 091 33 29 W |
| Savanna - Sabula Bridge | Bridge | 178 | Jackson | 42 06 15 N | 090 09 40 W |
| Savannah | Populated Place | 276 | Davis | 40 37 27 N | 092 27 16 W |
| Savannah Cemetery | Cemetery | 268 | Davis | 40 37 15 N | 092 27 26 W |
| Savannah Church | Church | 274 | Davis | 40 37 29 N | 092 27 10 W |
| Savannah Church of Christ | Church | 250 | Wapello | 41 03 00 N | 092 24 11 W |
| Savannah Post Office (historical) | Post Office | 276 | Davis | 40 37 27 N | 092 27 16 W |
| Saveraid Park | Park | 256 | Black Hawk | 42 27 50 N | 092 15 33 W |
| Savior Baptist Church | Church | 263 | Black Hawk | 42 29 20 N | 092 17 36 W |
| Sawin Wildlife Area | Park | 372 | Worth | 43 28 30 N | 093 17 31 W |
| Sawmill Hollow Wildlife Area | Park | 353 | Harrison | 41 39 00 N | 095 54 31 W |
| Sawmill Lake | Lake | 177 | Jackson | 42 10 20 N | 090 16 34 W |
| Sawyer | Populated Place | 216 | Lee | 40 41 47 N | 091 21 19 W |
| Sawyer (historical) | Locale | 214 | Lee | 40 41 50 N | 091 21 06 W |
| Sawyer Post Office (historical) | Post Office | 216 | Lee | 40 41 47 N | 091 21 19 W |
| Sawyer School | School | 307 | Story | 42 02 01 N | 093 40 39 W |
| Sawyers Rock | Pillar | 229 | Jones | 42 13 20 N | 090 54 20 W |
| Sax Cemetery | Cemetery | 217 | Lee | 40 42 10 N | 091 39 01 W |
| Saxon | Populated Place | 334 | Wayne | 40 45 11 N | 093 27 26 W |
| Saxon Post Office (historical) | Post Office | 334 | Wayne | 40 45 11 N | 093 27 26 W |
| Saydel Community Health Center | Hospital | 276 | Polk | 41 38 40 N | 093 33 27 W |
| Saydel High School | School | 284 | Polk | 41 39 41 N | 093 36 28 W |
| Sayers Cemetery | Cemetery | 267 | Iowa | 41 50 52 N | 092 09 30 W |
| Sayers Park | Park | 290 | Polk | 41 32 50 N | 093 37 60 W |
| Saylers Farm Cemetery | Cemetery | 329 | Mills | 41 06 30 N | 095 29 31 W |
| Saylings Creek | Stream | | Adams | 40 56 59 N | 094 29 38 W |
| Saylor | Populated Place | 291 | Polk | 41 39 58 N | 093 35 48 W |
| Saylor Center School | School | 258 | Polk | 41 38 35 N | 093 37 40 W |
| Saylor Creek | Stream | | Polk | 41 38 23 N | 093 38 25 W |
| Saylor Station | Locale | 255 | Polk | 41 40 18 N | 093 41 59 W |
| Saylor Station | Populated Place | 293 | Polk | 41 40 50 N | 093 35 45 W |
| Saylor Timber Area | Park | 363 | Wright | 42 49 35 N | 093 36 21 W |
| Saylorville | Populated Place | 271 | Polk | 41 40 43 N | 093 37 47 W |
| Saylorville Baptist Church | Church | 269 | Polk | 41 40 38 N | 093 37 40 W |
| Saylorville Dam | Dam | 276 | Polk | 41 42 13 N | 093 40 50 W |
| Saylorville Lake | Reservoir | 259 | Polk | 41 42 16 N | 093 40 55 W |
| Saylorville Post Office (historical) | Post Office | 271 | Polk | 41 40 43 N | 093 37 47 W |
| Sayre Cemetery | Cemetery | 327 | Madison | 41 16 29 N | 093 52 51 W |
| Sayre Post Office (historical) | Post Office | 390 | Buena Vista | 42 41 02 N | 094 55 01 W |
| Scandia Bridge (historical) | Bridge | 253 | Dallas | 41 50 56 N | 093 50 30 W |
| Scandinavian Cemetery | Cemetery | 458 | Buena Vista | 42 40 60 N | 095 18 40 W |
| Scandinavian Cemetery | Cemetery | 175 | Lee | 40 28 24 N | 091 28 42 W |
| Scarborough Lake | Lake | 177 | Jackson | 42 09 26 N | 090 14 58 W |
| Scarville | Locale | 380 | Winnebago | 43 28 10 N | 093 37 03 W |
| Scarville | Populated Place | 382 | Winnebago | 43 28 14 N | 093 37 04 W |