Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Sunday Cemetery | Cemetery | 272 | Story | 41 59 40 N | 093 36 31 W |
| Sundel Plaza | Locale | 300 | Pottawattamie | 41 15 38 N | 095 52 21 W |
| Sundown Golf Course | Locale | 199 | Des Moines | 40 50 20 N | 091 08 59 W |
| Sundown Lake Recreation Area | Park | 248 | Appanoose | 40 50 00 N | 092 43 41 W |
| Sunfield Mobile Home Park | Populated Place | 292 | Warren | 41 22 10 N | 093 33 03 W |
| Sunfish Lake | Lake | 178 | Jackson | 42 07 28 N | 090 11 37 W |
| Sunfish Lake | Lake | 164 | Louisa | 41 06 28 N | 091 05 26 W |
| Sunflower Spiritualist Church | Church | 187 | Clinton | 41 50 53 N | 090 12 03 W |
| Sunken Creek | Stream | | Floyd | 43 11 29 N | 092 47 16 W |
| Sunken Garden Park | Park | 384 | Woodbury | 42 31 12 N | 096 24 03 W |
| Sunken Gardens Park | Park | 262 | Marion | 41 24 42 N | 092 54 56 W |
| Sunken Grove State Game Management Area | Park | 379 | Pocahontas | 42 37 45 N | 094 53 45 W |
| Sunken Island Lake | Lake | 377 | Pocahontas | 42 37 57 N | 094 54 12 W |
| Sunken Lake | Lake | 428 | Dickinson | 43 28 46 N | 095 07 43 W |
| Sunkissed Meadows Golf Course | Locale | 305 | Webster | 42 29 58 N | 094 11 31 W |
| Sunny Brae Golf Club | Locale | 329 | Mitchell | 43 15 23 N | 092 49 21 W |
| Sunny Brooks School (historical) | School | 415 | Clay | 43 09 40 N | 095 19 40 W |
| Sunny Crest Park | Park | 192 | Scott | 41 31 41 N | 090 30 05 W |
| Sunny Crest Santarium | Hospital | 252 | Dubuque | 42 31 56 N | 090 39 15 W |
| Sunny Hill Care Center | Hospital | 277 | Tama | 41 58 35 N | 092 34 51 W |
| Sunny Hill Cemetery | Cemetery | 439 | Adair | 41 29 27 N | 094 38 26 W |
| Sunny Hill Cemetery | Cemetery | 293 | Polk | 41 41 00 N | 093 47 23 W |
| Sunny Knoll Care Center | Hospital | 370 | Calhoun | 42 23 53 N | 094 37 21 W |
| Sunny Side | Locale | 272 | Buchanan | 42 19 46 N | 092 02 25 W |
| Sunny Side Post Office (historical) | Post Office | 247 | Buchanan | 42 18 10 N | 092 02 01 W |
| Sunny-Brook Mobile Home Park | Populated Place | 258 | Polk | 41 40 08 N | 093 32 43 W |
| Sunnybrook Assisted Living Center | Hospital | 203 | Jefferson | 40 59 00 N | 092 00 11 W |
| Sunnybrook Medical Clinic | Hospital | 382 | Woodbury | 42 27 18 N | 096 20 43 W |
| Sunnycrest Nursing Center | Hospital | 292 | Tama | 42 10 10 N | 092 18 41 W |
| Sunnydale School | School | 314 | Pottawattamie | 41 16 10 N | 095 47 06 W |
| Sunnyside Avenue Baptist Church | Church | 207 | Des Moines | 40 49 59 N | 091 08 41 W |
| Sunnyside Bible Chapel | Church | 360 | Cass | 41 23 51 N | 095 01 46 W |
| Sunnyside Building | Building | 286 | Winneshiek | 43 18 38 N | 091 48 07 W |
| Sunnyside Care Center | Hospital | 233 | Wapello | 41 00 56 N | 092 23 13 W |
| Sunnyside Cemetery | Cemetery | 237 | Van Buren | 40 40 05 N | 092 09 21 W |
| Sunnyside Cemetery | Cemetery | 389 | Winnebago | 43 24 33 N | 093 31 58 W |
| Sunnyside Country Club | Locale | 275 | Black Hawk | 42 30 54 N | 092 18 54 W |
| Sunnyside Golf Course | Locale | 280 | Black Hawk | 42 27 30 N | 092 22 51 W |
| Sunnyside Memory Gardens | Cemetery | 310 | Floyd | 43 01 41 N | 092 38 46 W |
| Sunnyside Mennonite Church | Church | 205 | Washington | 41 29 12 N | 091 41 44 W |
| Sunnyside Park | Park | 359 | Cass | 41 23 55 N | 095 01 37 W |
| Sunnyside Park | Park | 333 | Hardin | 42 30 43 N | 093 15 41 W |
| Sunnyside Park Campground | Locale | 358 | Cass | 41 23 50 N | 095 01 25 W |
| Sunnyside School | School | 205 | Des Moines | 40 49 56 N | 091 07 06 W |
| Sunnyside School | School | 207 | Johnson | 41 35 03 N | 091 32 47 W |
| Sunnyside School | School | 295 | Lucas | 41 05 18 N | 093 13 50 W |
| Sunnyside School | School | 231 | Muscatine | 41 33 07 N | 090 55 13 W |
| Sunnyside School | School | 355 | Plymouth | 42 41 08 N | 096 29 53 W |
| Sunnyside School | School | 364 | Pottawattamie | 41 12 40 N | 095 42 29 W |
| Sunnyside School | School | 383 | Woodbury | 42 27 43 N | 096 20 24 W |
| Sunnyside School (historical) | Locale | 220 | Clinton | 41 51 46 N | 090 35 14 W |
| Sunnyslope Church | Church | 312 | Wayne | 40 50 30 N | 093 08 06 W |
| Sunnyview Cemetery | Cemetery | 300 | Appanoose | 40 42 15 N | 092 40 32 W |
| Sunrise Campgrounds | Locale | 428 | Buena Vista | 42 37 42 N | 095 10 31 W |
| Sunrise Golf Course | Locale | 205 | Scott | 41 33 48 N | 090 26 50 W |
| Sunrise Guest Home | Hospital | 334 | Chickasaw | 42 57 36 N | 092 11 51 W |
| Sunrise Hill Care Center | Hospital | 286 | Tama | 42 11 20 N | 092 27 31 W |
| Sunrise Lake | Lake | 227 | Washington | 41 16 47 N | 091 45 45 W |
| Sunrise Mobile Court | Populated Place | 223 | Linn | 41 55 30 N | 091 40 31 W |
| Sunrise Mobile Home Community | Populated Place | 290 | Jasper | 41 43 20 N | 093 01 41 W |
| Sunrise Mobile Home Park | Populated Place | 264 | Marion | 41 23 55 N | 092 53 46 W |
| Sunrise Mobile Home Park | Populated Place | 443 | Sioux | 43 05 00 N | 096 09 36 W |
| Sunrise Mobile Home Village | Populated Place | 205 | Johnson | 41 38 20 N | 091 28 52 W |
| Sunrise Park | Park | 428 | Buena Vista | 42 37 42 N | 095 10 31 W |
| Sunrise Park | Park | 427 | O'Brien | 43 11 20 N | 095 50 01 W |
| Sunrise Park | Park | 420 | Plymouth | 42 48 45 N | 095 57 46 W |
| Sunrise Park | Park | 292 | Polk | 41 43 40 N | 093 35 36 W |
| Sunrise Retirement Community | Hospital | 399 | Woodbury | 42 28 36 N | 096 20 15 W |
| Sunrise School | School | 451 | Sioux | 43 15 04 N | 096 30 38 W |
| Sunset Bay Marina | Locale | 378 | Cerro Gordo | 43 06 40 N | 093 23 41 W |
| Sunset Beach | Beach | 430 | Dickinson | 43 21 58 N | 095 08 31 W |
| Sunset Dental Professionals Building | Hospital | 286 | Warren | 41 28 45 N | 093 40 48 W |
| Sunset Heights School | School | 329 | Hamilton | 42 27 48 N | 093 49 54 W |
| Sunset Knoll Retirement Home | Hospital | 426 | Cherokee | 42 42 55 N | 095 26 27 W |
| Sunset Lake | Reservoir | 343 | Cerro Gordo | 43 09 15 N | 093 13 56 W |
| Sunset Memorial Gardens | Cemetery | 196 | Lee | 40 25 30 N | 091 24 51 W |
| Sunset Memorial Gardens | Cemetery | 282 | Polk | 41 30 57 N | 093 38 37 W |
| Sunset Park | Park | 434 | Buena Vista | 42 38 17 N | 095 12 21 W |
| Sunset Park | Park | 402 | Clay | 43 08 39 N | 095 09 34 W |
| Sunset Park | Park | 357 | Crawford | 42 00 04 N | 095 22 29 W |
| Sunset Park | Park | 365 | Fayette | 42 58 07 N | 091 48 51 W |
| Sunset Park | Park | 306 | Floyd | 43 04 21 N | 092 41 01 W |
| Sunset Park | Park | 283 | Jasper | 41 42 19 N | 093 03 10 W |
| Sunset Park | Park | 459 | Osceola | 43 23 50 N | 095 45 26 W |
| Sunset Park | Park | 305 | Polk | 41 43 43 N | 093 36 51 W |
| Sunset Park | Park | 299 | Pottawattamie | 41 14 50 N | 095 51 36 W |
| Sunset Park | Park | 221 | Washington | 41 17 52 N | 091 42 18 W |
| Sunset Post Office (historical) | Post Office | 327 | Story | 42 09 60 N | 093 20 31 W |
| Sunset Rest Cemetery | Cemetery | 376 | Worth | 43 26 53 N | 093 13 42 W |
| Sunset School | School | 375 | Cerro Gordo | 43 08 28 N | 093 23 36 W |
| Sunset View Cemetery | Cemetery | 369 | Cherokee | 42 34 42 N | 095 42 38 W |
| Sunset Village | Populated Place | 363 | Crawford | 42 00 03 N | 095 22 26 W |
| Sunset Village | Populated Place | 257 | Linn | 42 02 45 N | 091 40 31 W |
| Sunset Village Mobile Home Park | Populated Place | 302 | Marshall | 42 00 27 N | 092 53 41 W |
| Sunshine | Populated Place | 305 | Appanoose | 40 44 23 N | 092 55 31 W |
| Sunshine Open Bible Tabernacle | Church | 247 | Polk | 41 36 18 N | 093 34 42 W |
| Sunshine Park | Park | 376 | Winnebago | 43 16 07 N | 093 38 52 W |
| Superior | Locale | 457 | Dickinson | 43 25 55 N | 094 56 51 W |
| Superior | Populated Place | 457 | Dickinson | 43 25 49 N | 094 56 47 W |
| Superior Co-op Elevator - Gruver | Locale | 397 | Emmet | 43 23 36 N | 094 42 19 W |
| Superior Marsh Area | Park | 433 | Dickinson | 43 27 40 N | 094 55 01 W |
| Superior Post Office | Post Office | 457 | Dickinson | 43 25 49 N | 094 56 47 W |
| Superior Public Library | Building | 457 | Dickinson | 43 25 49 N | 094 56 47 W |
| Superior Township Cemetery | Cemetery | 455 | Dickinson | 43 26 24 N | 094 57 13 W |
| Supple Bridge | Bridge | 225 | Jones | 42 11 07 N | 090 58 40 W |
| Surbeck Honor House | Building | 267 | Marion | 41 24 12 N | 092 55 09 W |
| Surf Ballroom | Building | 375 | Cerro Gordo | 43 08 20 N | 093 23 12 W |
| Surgical Associates | Hospital | 309 | Poweshiek | 41 44 34 N | 092 44 06 W |
| Surgical Associates Center | Hospital | 322 | Floyd | 43 03 03 N | 092 40 59 W |
| Surgical Consultants Center | Hospital | 388 | Carroll | 42 03 20 N | 094 52 01 W |