Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| State Line Co-op Elevator | Locale | 387 | Emmet | 43 21 07 N | 094 32 31 W |
| State Line Co-op Elevator | Locale | 379 | Kossuth | 43 13 11 N | 094 25 41 W |
| State Line Cooperative Elevator | Locale | 391 | Emmet | 43 17 41 N | 094 30 42 W |
| State Line Cooperative Elevator | Locale | 353 | Kossuth | 43 14 25 N | 094 13 31 W |
| State Line Marsh State Game Management Area | Park | 362 | Kossuth | 43 29 42 N | 094 21 56 W |
| State Line Slough | Channel | 187 | Clayton | 42 52 46 N | 091 05 32 W |
| State Line Slough | Channel | 186 | Clayton | 42 51 47 N | 091 04 51 W |
| State Line Station (historical) | Locale | 321 | Taylor | 40 34 35 N | 094 47 49 W |
| State of Iowa | Civil | 292 | Story | 42 00 01 N | 093 30 02 W |
| State of Iowa Historical Building | Building | 251 | Polk | 41 35 27 N | 093 36 33 W |
| State Street Bridge | Bridge | 331 | Cerro Gordo | 43 09 07 N | 093 11 30 W |
| Stateline Cemetery | Cemetery | 381 | Worth | 43 29 15 N | 093 14 31 W |
| Stateline Co-op Elevator | Locale | 354 | Kossuth | 43 14 06 N | 094 02 29 W |
| Stateline Cooperative Elevator | Locale | 352 | Kossuth | 43 25 18 N | 094 09 44 W |
| Staten Cemetery | Cemetery | 281 | Appanoose | 40 38 45 N | 092 38 51 W |
| Statler Woods | Park | 235 | Washington | 41 22 02 N | 091 52 01 W |
| Stauch Cemetery | Cemetery | 300 | Fremont | 40 39 00 N | 095 34 31 W |
| Stavanger Cemetery | Cemetery | 361 | Hardin | 42 14 40 N | 093 23 22 W |
| Stavanger Cemetery | Cemetery | 295 | Marshall | 41 58 01 N | 092 48 05 W |
| Stavanger Cemetery | Cemetery | 362 | Winneshiek | 43 06 15 N | 091 46 56 W |
| Stavanger Church | Church | 295 | Marshall | 41 58 01 N | 092 48 05 W |
| Stavanger Church | Church | 361 | Winneshiek | 43 06 15 N | 091 46 52 W |
| Stavanger Lutheran Church | Church | 366 | Hardin | 42 14 44 N | 093 23 44 W |
| Stayskal Cemetery | Cemetery | 303 | Tama | 41 58 44 N | 092 24 28 W |
| Steady Run | Stream | | Keokuk | 41 14 13 N | 092 16 55 W |
| Steamboat Rock | Cliff | 329 | Hardin | 42 24 01 N | 093 04 33 W |
| Steamboat Rock | Locale | 296 | Hardin | 42 24 20 N | 093 04 21 W |
| Steamboat Rock | Populated Place | 309 | Hardin | 42 24 34 N | 093 03 57 W |
| Steamboat Rock | Summit | 350 | Winneshiek | 43 20 28 N | 092 06 32 W |
| Steamboat Rock - Tower Rock County Park | Park | 302 | Hardin | 42 24 05 N | 093 04 56 W |
| Steamboat Rock Cemetery | Cemetery | 306 | Hardin | 42 24 20 N | 093 03 36 W |
| Steamboat Rock City Hall | Building | 306 | Hardin | 42 24 26 N | 093 04 01 W |
| Steamboat Rock Library | Building | 307 | Hardin | 42 24 32 N | 093 04 03 W |
| Steamboat Rock Post Office | Post Office | 308 | Hardin | 42 24 29 N | 093 03 59 W |
| Steamboat Rock School | School | 309 | Hardin | 42 24 29 N | 093 03 56 W |
| Steamboat Rock Wayside State Park | Park | 296 | Hardin | 42 24 29 N | 093 04 23 W |
| Steel Creek | Stream | | Decatur | 40 37 20 N | 093 35 42 W |
| Steele Cemetery | Cemetery | 231 | Jefferson | 40 55 20 N | 091 59 51 W |
| Steele Memorial Clinic | Hospital | 360 | Wright | 42 50 45 N | 093 36 41 W |
| Steele Prairie State Preserve | Park | 429 | Cherokee | 42 52 35 N | 095 34 41 W |
| Steeles Branch | Stream | | Clayton | 42 40 09 N | 091 17 02 W |
| Steels Branch | Stream | 295 | Warren | 41 19 27 N | 093 54 14 W |
| Steen Post Office (historical) | Post Office | 360 | Winnebago | 43 18 25 N | 093 56 01 W |
| Steer Creek | Stream | | Harrison | 41 40 27 N | 095 57 19 W |
| Stefan Park | Park | 221 | Linn | 41 57 40 N | 091 39 53 W |
| Steffens Colonnade | Park | 268 | Dubuque | 42 29 55 N | 090 41 35 W |
| Stegar Hollow | Valley | | Dubuque | 42 36 16 N | 090 51 52 W |
| Stein Creek | Stream | | Tama | 42 03 49 N | 092 19 55 W |
| Stein's Rockin R Mobile Home Park | Populated Place | 376 | Kossuth | 42 44 06 N | 094 26 39 W |
| Steinberg Wildlife Area | Park | 348 | Hardin | 42 30 40 N | 093 20 51 W |
| Steindler Building | Building | 217 | Johnson | 41 39 45 N | 091 32 40 W |
| Steiner Hall | Building | 311 | Poweshiek | 41 44 52 N | 092 43 19 W |
| Steinmeyer Cemetery | Cemetery | 202 | Van Buren | 40 38 54 N | 091 47 45 W |
| Stella Post Office (historical) | Post Office | 340 | Allamakee | 43 11 20 N | 091 31 11 W |
| Stemple School (historical) | School | 229 | Clinton | 41 50 42 N | 090 39 56 W |
| Stender Airport | Airport | 211 | Scott | 41 39 40 N | 090 44 29 W |
| Stennett | Populated Place | 348 | Montgomery | 41 05 23 N | 095 11 40 W |
| Stennett (historical) | Locale | 325 | Montgomery | 41 05 29 N | 095 11 52 W |
| Stennett Post Office (historical) | Post Office | 348 | Montgomery | 41 05 23 N | 095 11 40 W |
| Stephen H Taft Elementary School | School | 330 | Humboldt | 42 43 26 N | 094 12 59 W |
| Stephen Wildlife Area | Park | 369 | Howard | 43 14 10 N | 092 11 51 W |
| Stephens Auditorium | Building | 275 | Story | 42 01 13 N | 093 38 16 W |
| Stephens Forest Pond | Reservoir | 277 | Lucas | 41 01 13 N | 093 29 25 W |
| Stephens Forest Pond Dam | Dam | 277 | Lee | 41 01 13 N | 093 29 25 W |
| Stephens State Forest - Cedar Creek Unit | Forest | 288 | Lucas | 41 04 00 N | 093 11 01 W |
| Stephens State Forest - Chariton Unit | Forest | 299 | Lucas | 41 03 50 N | 093 10 01 W |
| Stephens State Forest - Lucas Unit | Forest | 295 | Lucas | 41 01 00 N | 093 28 51 W |
| Stephens State Forest - Thousand Acre Unit | Forest | 295 | Lucas | 41 06 30 N | 093 05 21 W |
| Stephens State Forest - White Breast Unit | Forest | 321 | Lucas | 40 59 09 N | 093 30 47 W |
| Stephens State Forest - Woodburn Unit | Forest | 275 | Clarke | 41 57 55 N | 093 35 01 W |
| Stephens Tract Wildlife Area | Park | 313 | Page | 40 51 05 N | 095 01 01 W |
| Stephenson Park | Park | 166 | Henry | 40 49 36 N | 091 26 26 W |
| Sterling | Populated Place | 262 | Jackson | 42 04 36 N | 090 15 10 W |
| Sterling Cemetery | Cemetery | 262 | Jackson | 42 04 36 N | 090 15 10 W |
| Sterling House | Hospital | 213 | Des Moines | 40 48 00 N | 091 08 34 W |
| Sterling Post Office (historical) | Post Office | 263 | Jackson | 42 04 38 N | 090 15 20 W |
| Sterner Cemetery | Cemetery | 240 | Wapello | 41 00 45 N | 092 15 00 W |
| Sternhill Park | Park | 309 | Pottawattamie | 41 16 20 N | 095 51 22 W |
| Steuben | Populated Place | 262 | Davis | 40 43 25 N | 092 23 19 W |
| Steuben (historical) | Locale | 262 | Davis | 40 43 25 N | 092 23 19 W |
| Steuck Cemetery | Cemetery | 466 | O'Brien | 43 07 16 N | 095 32 42 W |
| Stevens | Locale | 354 | Kossuth | 43 25 55 N | 094 00 16 W |
| Stevens | Populated Place | 354 | Kossuth | 43 25 54 N | 094 00 15 W |
| Stevens Cove | Bay | 427 | Dickinson | 43 26 46 N | 095 06 39 W |
| Stewart Avenue Bridge | Bridge | 327 | Cerro Gordo | 43 09 24 N | 093 11 25 W |
| Stewart Cemetery | Cemetery | 272 | Mahaska | 41 30 17 N | 092 41 60 W |
| Stewart Creek | Stream | | Floyd | 43 06 46 N | 092 43 14 W |
| Stewart Library | Building | 312 | Poweshiek | 41 44 39 N | 092 43 26 W |
| Stewart Memorial Hospital | Hospital | 371 | Calhoun | 42 16 00 N | 094 44 49 W |
| Stewart Memorial Hospital Heliport | Airport | 377 | Calhoun | 42 16 12 N | 094 44 01 W |
| Stewart Memorial Library | Building | 230 | Linn | 41 59 15 N | 091 39 31 W |
| Stewart School | School | 279 | Lucas | 41 05 17 N | 093 23 03 W |
| Stewart School | School | 231 | Washington | 41 18 23 N | 091 41 21 W |
| Stewart Square | Park | 267 | Polk | 41 35 35 N | 093 35 50 W |
| Steyer Bridge | Bridge | 278 | Winneshiek | 43 17 52 N | 091 48 40 W |
| Stickle Cemetery | Cemetery | 265 | Marion | 41 17 28 N | 093 12 31 W |
| Stieneke Area County Park | Park | 354 | Cherokee | 42 36 34 N | 095 40 50 W |
| Stiles | Populated Place | 261 | Davis | 40 38 06 N | 092 21 05 W |
| Stiles Cemetery | Cemetery | 257 | Davis | 40 38 15 N | 092 21 03 W |
| Stiles Christian Church | Church | 262 | Davis | 40 38 05 N | 092 21 02 W |
| Stiles Post Office (historical) | Post Office | 256 | Davis | 40 38 14 N | 092 21 08 W |
| Stille Wildlife Area | Park | 350 | Cerro Gordo | 42 57 59 N | 093 19 07 W |
| Stillwater Cemetery | Cemetery | 329 | Mitchell | 43 12 47 N | 092 40 42 W |
| Stillwater Post Office (historical) | Post Office | 338 | Mitchell | 43 13 40 N | 092 38 21 W |
| Stillwell | Populated Place | 240 | Poweshiek | 41 31 26 N | 092 40 07 W |
| Stillwell Junior High School | School | 266 | Polk | 41 34 40 N | 093 43 31 W |
| Stilson | Populated Place | 367 | Hancock | 43 02 18 N | 093 53 07 W |
| Stilson (historical) | Locale | 367 | Hancock | 43 02 18 N | 093 53 07 W |
| Stilson Post Office (historical) | Post Office | 367 | Hancock | 43 02 18 N | 093 53 07 W |
| Stilwell Post Office (historical) | Post Office | 240 | Poweshiek | 41 31 26 N | 092 40 07 W |