Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Crozier | Locale | 394 | Buena Vista | 42 41 43 N | 095 03 46 W |
| Crozier Post Office (historical) | Post Office | 394 | Buena Vista | 42 41 43 N | 095 03 46 W |
| Crumbacher Wildlife Area | Park | 281 | Buchanan | 42 26 10 N | 091 58 56 W |
| Crusade High School | School | 229 | Louisa | 41 05 31 N | 091 15 18 W |
| Crystal (historical) | Locale | 277 | Tama | 42 10 57 N | 092 34 47 W |
| Crystal Cemetery | Cemetery | 316 | Tama | 42 08 17 N | 092 37 36 W |
| Crystal Creek | Stream | | Clinton | 41 48 40 N | 090 34 27 W |
| Crystal Creek | Stream | | Tama | 42 06 25 N | 092 41 28 W |
| Crystal Hills Wildlife Management Area | Park | 376 | Hancock | 43 13 30 N | 093 45 46 W |
| Crystal Lake | Lake | 199 | Clinton | 41 48 56 N | 090 34 43 W |
| Crystal Lake | Lake | 382 | Hancock | 43 13 49 N | 093 47 34 W |
| Crystal Lake | Populated Place | 388 | Hancock | 43 13 24 N | 093 47 33 W |
| Crystal Lake Fire Department | Building | 388 | Hancock | 43 13 24 N | 093 47 33 W |
| Crystal Lake Park | Park | 384 | Hancock | 43 13 32 N | 093 47 33 W |
| Crystal Lake Post Office | Post Office | 388 | Hancock | 43 13 24 N | 093 47 33 W |
| Crystal Lake State Game Mgt Area | Park | 383 | Hancock | 43 14 07 N | 093 47 06 W |
| Crystal Post Office (historical) | Post Office | 289 | Tama | 42 10 30 N | 092 33 41 W |
| Crystal Springs Golf Club Post Office (historical) | Post Office | 207 | Des Moines | 40 50 18 N | 091 07 13 W |
| Crystal Township Cemetery | Cemetery | 396 | Hancock | 43 13 24 N | 093 48 13 W |
| Crystallake (historical) | Locale | 382 | Hancock | 43 13 30 N | 093 47 22 W |
| Cub Creek | Stream | | Poweshiek | 41 43 47 N | 092 20 21 W |
| Cub Park | Park | 320 | Bremer | 42 50 44 N | 092 05 56 W |
| Cuba Cemetery | Cemetery | 248 | Monroe | 41 04 00 N | 092 39 29 W |
| Cuba Post Office (historical) | Post Office | 364 | Hancock | 42 59 40 N | 093 47 31 W |
| Cuba Post Office (historical) | Post Office | 262 | Monroe | 41 04 10 N | 092 40 03 W |
| Culinary Arts - Hills Diner | Building | 250 | Wapello | 41 02 42 N | 092 23 41 W |
| Cultural Awareness Center | Building | 284 | Bremer | 42 43 42 N | 092 28 51 W |
| Cumberland | Populated Place | 397 | Cass | 41 16 27 N | 094 52 13 W |
| Cumberland (historical) | Locale | 375 | Cass | 41 16 15 N | 094 52 13 W |
| Cumberland City Hall | Building | 387 | Cass | 41 16 20 N | 094 52 13 W |
| Cumberland Fire Department | Building | 387 | Cass | 41 16 20 N | 094 52 13 W |
| Cumberland Post Office | Post Office | 387 | Cass | 41 16 20 N | 094 52 13 W |
| Cumberland Public Library | Building | 387 | Cass | 41 16 20 N | 094 52 13 W |
| Cumberland Square Shopping Center | Locale | 202 | Scott | 41 33 00 N | 090 30 03 W |
| Cumming | Populated Place | 299 | Warren | 41 28 60 N | 093 45 45 W |
| Cumming (historical) | Locale | 299 | Warren | 41 29 05 N | 093 45 48 W |
| Cumming City Park | Park | 299 | Warren | 41 28 60 N | 093 45 45 W |
| Cumming Post Office | Post Office | 299 | Warren | 41 28 60 N | 093 45 45 W |
| Cummings Park | Park | 338 | Boone | 42 03 48 N | 093 53 59 W |
| Cummings Plot | Cemetery | 356 | Allamakee | 43 05 30 N | 091 23 00 W |
| Cunhingham Cemetery | Cemetery | 327 | Wayne | 40 44 10 N | 093 32 14 W |
| Cunningham Bridge | Bridge | 259 | Madison | 41 24 17 N | 093 51 41 W |
| Cunningham Slough | Lake | 386 | Emmet | 43 18 28 N | 094 41 32 W |
| Cunningham Slough State Game Management Area | Park | 386 | Emmet | 43 18 28 N | 094 41 32 W |
| Cupp Grave | Cemetery | 244 | Davis | 40 46 00 N | 092 16 01 W |
| Curious Kids' Museum | Building | 340 | Webster | 42 30 15 N | 094 09 39 W |
| Curlew | Populated Place | 378 | Palo Alto | 42 58 44 N | 094 44 28 W |
| Curlew (historical) | Locale | 378 | Palo Alto | 42 58 42 N | 094 44 18 W |
| Curlew Post Office | Post Office | 378 | Palo Alto | 42 58 44 N | 094 44 28 W |
| Curran Branch | Stream | | Dubuque | 42 21 37 N | 090 54 35 W |
| Currier Residence Hall | Building | 215 | Johnson | 41 39 59 N | 091 32 06 W |
| Curris Business Building | Building | 281 | Black Hawk | 42 30 49 N | 092 27 41 W |
| Curry Creek | Stream | | Butler | 42 43 39 N | 092 35 05 W |
| Curtin Timber | Park | 395 | Woodbury | 42 19 14 N | 095 52 21 W |
| Curtis (historical) | Populated Place | 219 | Johnson | 41 48 15 N | 091 38 59 W |
| Curtis Hill Indian Museum | Building | 257 | Johnson | 41 50 30 N | 091 38 31 W |
| Curtis Post Office (historical) | Post Office | 219 | Johnson | 41 48 15 N | 091 38 59 W |
| Curtis School | School | 241 | Polk | 41 34 60 N | 093 36 26 W |
| Curtiss Hall | Building | 289 | Story | 42 01 34 N | 093 38 41 W |
| Cushing | Populated Place | 395 | Woodbury | 42 27 53 N | 095 40 30 W |
| Cushing (historical) | Locale | 390 | Woodbury | 42 27 60 N | 095 40 31 W |
| Cushing Cemetery | Cemetery | 396 | Woodbury | 42 27 57 N | 095 41 35 W |
| Cushing City Police Department | Building | 394 | Woodbury | 42 27 56 N | 095 40 31 W |
| Cushing Fire Department | Building | 394 | Woodbury | 42 27 56 N | 095 40 31 W |
| Cushing Methodist Church | Church | 398 | Woodbury | 42 27 56 N | 095 40 37 W |
| Cushing Post Office | Post Office | 391 | Woodbury | 42 27 59 N | 095 40 31 W |
| Cushing Town Hall | Building | 394 | Woodbury | 42 27 56 N | 095 40 31 W |
| Custer Cemetery | Cemetery | 222 | Washington | 41 11 32 N | 091 42 45 W |
| Custon Park | Park | 178 | Clinton | 41 51 54 N | 090 10 45 W |
| Cutler - Donahue Covered Bridge | Bridge | 327 | Madison | 41 19 53 N | 094 00 17 W |
| Cutshaw Bridge State Access Area | Park | 279 | Buchanan | 42 32 20 N | 092 03 06 W |
| Cylinder | Locale | 363 | Palo Alto | 43 05 13 N | 094 33 03 W |
| Cylinder | Populated Place | 363 | Palo Alto | 43 05 20 N | 094 33 11 W |
| Cylinder City Park | Park | 363 | Palo Alto | 43 05 20 N | 094 33 11 W |
| Cylinder Co-op Elevator | Locale | 363 | Palo Alto | 43 05 20 N | 094 33 11 W |
| Cylinder Creek | Stream | | Palo Alto | 42 58 56 N | 094 31 45 W |
| Cylinder Heritage Museum | Building | 363 | Palo Alto | 43 05 20 N | 094 33 11 W |
| Cylinder Post Office | Post Office | 363 | Palo Alto | 43 05 20 N | 094 33 11 W |
| Cypsum City (historical) | Populated Place | 339 | Webster | 42 28 25 N | 094 07 41 W |
| Czech National Cemetery | Cemetery | 235 | Linn | 41 57 25 N | 091 39 21 W |
| Czeck Village | Locale | 222 | Linn | 41 57 47 N | 091 39 50 W |
| D A R Park | Park | 380 | Cerro Gordo | 43 08 32 N | 093 23 25 W |
| D U Beving Memorial Museum | Building | 435 | Dickinson | 43 20 17 N | 095 08 58 W |
| DAEC Helipad | Airport | 230 | Linn | 42 06 07 N | 091 46 38 W |
| Dagel Unit - Otter Creek Wildlife Management Area | Park | 451 | Osceola | 43 20 48 N | 095 44 26 W |
| Daggett Grave | Cemetery | 258 | Wapello | 41 01 30 N | 092 37 51 W |
| Daggett Post Office (historical) | Post Office | 262 | Benton | 42 08 15 N | 092 08 31 W |
| Dahle Park | Park | 375 | Winnebago | 43 27 58 N | 093 34 34 W |
| Dahlonega | Populated Place | 251 | Wapello | 41 03 31 N | 092 22 12 W |
| Dahlonega Cemetery | Cemetery | 246 | Wapello | 41 03 14 N | 092 22 12 W |
| Dahlonega Post Office (historical) | Post Office | 251 | Wapello | 41 03 31 N | 092 22 12 W |
| Dahlside Cemetery | Cemetery | 378 | Worth | 43 26 60 N | 093 16 11 W |
| Dailey Creek | Stream | | Butler | 42 45 34 N | 092 51 35 W |
| Daily Burial Ground | Cemetery | 405 | Buena Vista | 42 53 00 N | 095 16 51 W |
| Dairy | Locale | 232 | Washington | 41 21 30 N | 091 34 52 W |
| Dairy Grove Post Office (historical) | Post Office | 267 | Jasper | 41 32 32 N | 092 52 33 W |
| Dairy Post Office (historical) | Post Office | 227 | Washington | 41 24 10 N | 091 33 31 W |
| Dairygrove Cemetery | Cemetery | 260 | Jasper | 41 31 56 N | 092 52 15 W |
| Dairyville | Populated Place | 307 | Grundy | 42 29 05 N | 092 39 10 W |
| Dairyville (historical) | Locale | 297 | Grundy | 42 28 15 N | 092 39 16 W |
| Dairyville Post Office (historical) | Post Office | 298 | Grundy | 42 29 05 N | 092 38 01 W |
| Dakins Lake | Reservoir | 330 | Story | 42 10 16 N | 093 17 40 W |
| Dakins Lake Park | Park | 336 | Story | 42 10 17 N | 093 17 27 W |
| Dakken Chiropractic Office | Hospital | 393 | Winnebago | 43 25 12 N | 093 32 03 W |
| Dakota Bend Wildlife Area | Park | 329 | Woodbury | 42 22 40 N | 096 24 36 W |
| Dakota City | Civil | 343 | Humboldt | 42 43 20 N | 094 11 50 W |
| Dakota City | Populated Place | 343 | Humboldt | 42 43 20 N | 094 11 50 W |
| Dakota City (historical) | Locale | 342 | Humboldt | 42 43 38 N | 094 12 04 W |
| Dakota City Access | Locale | 323 | Humboldt | 42 43 02 N | 094 11 21 W |
| Dakota City City Hall | Building | 345 | Humboldt | 42 43 14 N | 094 12 05 W |