Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Sugar Creek | Locale | 266 | Jasper | 41 37 23 N | 092 46 34 W |
| Sugar Creek | Stream | | Clinton | 42 02 53 N | 090 25 53 W |
| Sugar Creek | Stream | | Dallas | 41 31 53 N | 093 48 59 W |
| Sugar Creek | Stream | | Henry | 41 05 31 N | 091 42 59 W |
| Sugar Creek | Stream | | Jasper | 41 40 53 N | 093 15 56 W |
| Sugar Creek | Stream | | Keokuk | 41 14 03 N | 092 17 22 W |
| Sugar Creek | Stream | | Lee | 40 24 16 N | 091 30 20 W |
| Sugar Creek | Stream | | Lee | 40 36 12 N | 091 25 56 W |
| Sugar Creek | Stream | | Marion | 41 27 43 N | 093 15 16 W |
| Sugar Creek | Stream | | Mitchell | 43 16 05 N | 092 50 25 W |
| Sugar Creek | Stream | | Muscatine | 41 33 19 N | 091 06 19 W |
| Sugar Creek | Stream | | Poweshiek | 41 32 50 N | 092 44 13 W |
| Sugar Creek | Stream | | Tama | 42 00 47 N | 092 43 29 W |
| Sugar Creek | Stream | | Wapello | 41 01 07 N | 092 21 27 W |
| Sugar Creek | Stream | | Wayne | 40 54 44 N | 093 18 16 W |
| Sugar Creek (historical) | Populated Place | 152 | Lee | 40 24 28 N | 091 30 19 W |
| Sugar Creek Cemetery | Cemetery | 217 | Henry | 41 08 05 N | 091 38 05 W |
| Sugar Creek Cemetery | Cemetery | 264 | Poweshiek | 41 37 41 N | 092 45 56 W |
| Sugar Creek Church | Church | 233 | Cedar | 41 40 12 N | 091 02 05 W |
| Sugar Creek Church | Church | 217 | Henry | 41 08 05 N | 091 38 25 W |
| Sugar Creek Church Cemetery | Cemetery | 232 | Cedar | 41 40 10 N | 091 02 06 W |
| Sugar Creek Lake | Lake | 272 | Dallas | 41 33 19 N | 093 51 13 W |
| Sugar Creek Lake Dam | Dam | 272 | Madison | 41 33 16 N | 093 51 11 W |
| Sugar Creek Mills | Locale | 199 | Cedar | 41 36 45 N | 091 04 14 W |
| Sugar Creek Post Office (historical) | Post Office | 205 | Cedar | 41 36 40 N | 091 04 21 W |
| Sugar Creek Post Office (historical) | Post Office | 272 | Jasper | 41 37 25 N | 092 46 31 W |
| Sugar Grove Cemetery | Cemetery | 269 | Jasper | 41 40 39 N | 093 08 27 W |
| Sugar Loaf | Summit | 241 | Clayton | 42 38 36 N | 090 57 36 W |
| Sugar Valley Campground | Locale | 174 | Lee | 40 27 55 N | 091 28 41 W |
| Sulek Cemetery | Cemetery | 243 | Johnson | 41 50 50 N | 091 37 18 W |
| Sulentic Park | Park | 280 | Black Hawk | 42 27 55 N | 092 22 36 W |
| Sullivan Cemetery | Cemetery | 268 | Davis | 40 43 00 N | 092 25 01 W |
| Sullivan Memorial Park | Park | 259 | Black Hawk | 42 30 38 N | 092 20 06 W |
| Sullivan Post Office (historical) | Post Office | 293 | Jackson | 42 18 10 N | 090 38 20 W |
| Sullivan Slough | Stream | | Des Moines | 40 43 52 N | 091 07 06 W |
| Sullivan Slough Mississippi River Access | Locale | 158 | Des Moines | 40 43 49 N | 091 07 21 W |
| Sullivan Wildlife Area | Park | 356 | Wright | 42 53 06 N | 093 36 49 W |
| Sully | Populated Place | 280 | Jasper | 41 34 42 N | 092 50 42 W |
| Sully (historical) | Locale | 281 | Jasper | 41 34 40 N | 092 50 56 W |
| Sully Cemetery | Cemetery | 278 | Jasper | 41 34 55 N | 092 50 06 W |
| Sully Christian School | School | 278 | Jasper | 41 34 24 N | 092 50 19 W |
| Sully City Hall | Building | 280 | Jasper | 41 34 43 N | 092 50 51 W |
| Sully Co-op Elevator | Locale | 308 | Poweshiek | 41 43 40 N | 092 43 36 W |
| Sully Co-operative Exchange Elevator | Locale | 269 | Mahaska | 41 30 04 N | 092 44 19 W |
| Sully Community Church | Church | 279 | Jasper | 41 34 41 N | 092 50 40 W |
| Sully Family Health Center | Hospital | 279 | Jasper | 41 34 45 N | 092 50 45 W |
| Sully Library | Building | 280 | Jasper | 41 34 43 N | 092 50 51 W |
| Sully Meeting Room Church | Church | 265 | Jasper | 41 31 22 N | 092 49 25 W |
| Sully Municipal Landing Strip | Airport | 280 | Jasper | 41 34 20 N | 092 50 51 W |
| Sully Post Office | Post Office | 280 | Jasper | 41 34 35 N | 092 51 01 W |
| Sulphur Springs | Locale | 399 | Buena Vista | 42 37 19 N | 095 05 50 W |
| Sulphur Springs | Populated Place | 399 | Buena Vista | 42 37 19 N | 095 05 50 W |
| Sulphur Springs Post Office (historical) | Post Office | 399 | Buena Vista | 42 37 19 N | 095 05 50 W |
| Summer Creek | Stream | | Van Buren | 40 53 42 N | 091 47 02 W |
| Summer Hill Cemetery | Cemetery | 244 | Jackson | 42 03 22 N | 090 27 40 W |
| Summerbrook Park | Park | 284 | Polk | 41 43 25 N | 093 34 58 W |
| Summerhays Cemetery | Cemetery | 243 | Johnson | 41 41 20 N | 091 41 11 W |
| Summers Post Office (historical) | Post Office | 271 | Benton | 42 00 25 N | 091 55 01 W |
| Summerset | Populated Place | 247 | Warren | 41 25 53 N | 093 32 42 W |
| Summerset (historical) | Locale | 247 | Warren | 41 25 53 N | 093 32 42 W |
| Summerset Junction (historical) | Populated Place | 242 | Warren | 41 26 40 N | 093 32 40 W |
| Summerset Post Office (historical) | Post Office | 247 | Warren | 41 25 53 N | 093 32 42 W |
| Summit | Populated Place | 311 | Fremont | 40 49 45 N | 095 25 05 W |
| Summit | Populated Place | 244 | Linn | 41 55 15 N | 091 37 53 W |
| Summit | Populated Place | 219 | Muscatine | 41 30 31 N | 091 01 21 W |
| Summit (historical) | Locale | 418 | Clay | 43 12 40 N | 095 09 06 W |
| Summit (historical) | Locale | 219 | Muscatine | 41 30 30 N | 091 01 16 W |
| Summit (historical) | Populated Place | 218 | Lee | 40 39 55 N | 091 20 07 W |
| Summit Cemetery | Cemetery | 381 | Adams | 41 01 42 N | 094 31 46 W |
| Summit Cemetery | Cemetery | 229 | Keokuk | 41 11 23 N | 092 01 46 W |
| Summit Cemetery | Cemetery | 353 | Page | 40 45 23 N | 095 08 16 W |
| Summit Church | Church | 357 | Fremont | 40 40 10 N | 095 23 36 W |
| Summit Church (historical) | Church | 235 | Scott | 41 37 32 N | 090 29 55 W |
| Summit Complex | Park | 262 | Black Hawk | 42 29 24 N | 092 21 44 W |
| Summit Congregational Church | Church | 272 | Dubuque | 42 31 00 N | 090 43 15 W |
| Summit District School (historical) | School | 346 | Fayette | 42 39 33 N | 091 37 44 W |
| Summit Hill Cemetery | Cemetery | 372 | Pocahontas | 42 43 55 N | 094 39 34 W |
| Summit Lake | Reservoir | 377 | Union | 41 03 34 N | 094 23 51 W |
| Summit Lake Wildlife Management Area | Park | 375 | Union | 41 04 15 N | 094 23 36 W |
| Summit Post Office (historical) | Post Office | 418 | Clay | 43 12 40 N | 095 09 03 W |
| Summit Post Office (historical) | Post Office | 218 | Muscatine | 41 30 25 N | 091 01 06 W |
| Summit Post Office (historical) | Post Office | 318 | Story | 42 09 10 N | 093 38 31 W |
| Summit Ridge Post Office (historical) | Post Office | 219 | Muscatine | 41 30 30 N | 091 01 16 W |
| Summit School (historical) | School | 202 | Washington | 41 29 08 N | 091 42 06 W |
| Summit View Mobile Home Park | Populated Place | 254 | Linn | 41 57 10 N | 091 43 51 W |
| Summit Village Dyersville Park | Populated Place | 288 | Dubuque | 42 29 04 N | 091 06 54 W |
| Summitville | Populated Place | 205 | Lee | 40 28 22 N | 091 26 56 W |
| Summitville Post Office (historical) | Post Office | 205 | Lee | 40 28 22 N | 091 26 56 W |
| Sumner | Locale | 343 | Humboldt | 42 52 55 N | 094 13 26 W |
| Sumner | Populated Place | 323 | Bremer | 42 50 51 N | 092 05 30 W |
| Sumner (historical) | Locale | 323 | Bremer | 42 50 60 N | 092 05 41 W |
| Sumner Bridge | Bridge | 329 | Fayette | 42 51 44 N | 092 04 29 W |
| Sumner City Park | Park | 322 | Bremer | 42 50 40 N | 092 05 16 W |
| Sumner Junior High School | School | 324 | Bremer | 42 51 03 N | 092 06 03 W |
| Sumner Medical Clinic | Hospital | 329 | Bremer | 42 50 49 N | 092 06 34 W |
| Sumner Police Department | Building | 322 | Bremer | 42 50 51 N | 092 05 50 W |
| Sumner Post Office | Post Office | 321 | Bremer | 42 50 48 N | 092 05 53 W |
| Sumner Public Library | Building | 323 | Bremer | 42 50 52 N | 092 05 46 W |
| Sumner Senior High School | School | 330 | Bremer | 42 51 11 N | 092 06 27 W |
| Sumner Townhall | Building | 295 | Buchanan | 42 24 29 N | 091 55 14 W |
| Sun Rise Care and Rehabilitation Center for Mason City | Hospital | 347 | Cerro Gordo | 43 08 58 N | 093 13 17 W |
| Sun Valley Country Club | Locale | 357 | Ringgold | 40 50 40 N | 094 04 41 W |
| Sun Valley Golf Course | Locale | 381 | Woodbury | 42 31 00 N | 096 26 16 W |
| Sun Valley Lake | Reservoir | 341 | Ringgold | 40 51 50 N | 094 03 31 W |
| Sun Valley Lake | Reservoir | 339 | Ringgold | 40 51 20 N | 094 19 17 W |
| Sun Valley Lake Dam | Dam | 339 | Ringgold | 40 51 20 N | 094 19 17 W |
| Sunbury | Populated Place | 236 | Cedar | 41 40 12 N | 090 55 52 W |
| Sunbury (historical) | Locale | 236 | Cedar | 41 40 12 N | 090 55 52 W |
| Sunbury Post Office (historical) | Post Office | 236 | Cedar | 41 40 12 N | 090 55 52 W |
| Sunbury School (historical) | School | 236 | Cedar | 41 40 11 N | 090 55 08 W |