Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Carpenter Cemetery | Cemetery | 252 | Mahaska | 41 14 30 N | 092 37 41 W |
| Carpenter Elementary School | School | 257 | Jones | 42 14 39 N | 091 11 42 W |
| Carpenter Post Office | Post Office | 363 | Mitchell | 43 24 54 N | 093 00 54 W |
| Carpenter Residence Hall | Building | 283 | Polk | 41 36 13 N | 093 39 26 W |
| Carpenter School | School | 340 | Webster | 42 29 24 N | 094 09 54 W |
| Carr Park | Park | 273 | Story | 42 02 23 N | 093 36 14 W |
| Carr's Point Post Office (historical) | Post Office | 324 | Montgomery | 40 58 55 N | 095 20 43 W |
| Carriage Place | Populated Place | 220 | Scott | 41 35 26 N | 090 25 36 W |
| Carrie Chapman Catt Hall | Building | 290 | Story | 42 01 40 N | 093 38 44 W |
| Carrie Lane Chapman Catt Home | Building | 307 | Floyd | 43 03 59 N | 092 40 21 W |
| Carroll | Locale | 385 | Carroll | 42 03 51 N | 094 52 05 W |
| Carroll | Populated Place | 387 | Carroll | 42 03 57 N | 094 52 01 W |
| Carroll Access Area | Park | 358 | Howard | 43 15 43 N | 092 18 56 W |
| Carroll Baptist Church | Church | 377 | Carroll | 42 03 53 N | 094 51 11 W |
| Carroll City Cemetery | Cemetery | 387 | Carroll | 42 03 22 N | 094 51 36 W |
| Carroll City Fire Station | Building | 386 | Carroll | 42 03 51 N | 094 52 01 W |
| Carroll City Hall | Building | 386 | Carroll | 42 03 51 N | 094 52 01 W |
| Carroll City Police Department | Building | 386 | Carroll | 42 03 51 N | 094 52 01 W |
| Carroll City Public Library | Building | 386 | Carroll | 42 03 51 N | 094 52 01 W |
| Carroll Community Estates | Populated Place | 373 | Carroll | 42 03 45 N | 094 51 09 W |
| Carroll Country Club | Locale | 389 | Carroll | 42 03 48 N | 094 49 31 W |
| Carroll County | Civil | 395 | Carroll | 42 02 00 N | 094 53 01 W |
| Carroll County Courthouse | Building | 387 | Carroll | 42 03 53 N | 094 51 60 W |
| Carroll County Historical Museum | Building | 387 | Carroll | 42 03 57 N | 094 51 57 W |
| Carroll County Home | Building | 410 | Carroll | 42 06 02 N | 094 51 28 W |
| Carroll County Park | Park | 406 | Carroll | 41 54 23 N | 095 02 56 W |
| Carroll County Park | Park | 324 | Carroll | 42 09 26 N | 094 41 59 W |
| Carroll County Sheriffs Office | Building | 387 | Carroll | 42 03 53 N | 094 51 60 W |
| Carroll Dental Clinic | Hospital | 381 | Carroll | 42 03 53 N | 094 51 51 W |
| Carroll Eye Care Associates Center | Hospital | 388 | Carroll | 42 04 05 N | 094 51 58 W |
| Carroll Eye Clinic | Hospital | 389 | Carroll | 42 04 02 N | 094 52 07 W |
| Carroll Health Center | Hospital | 397 | Carroll | 42 05 04 N | 094 52 11 W |
| Carroll High School | School | 391 | Carroll | 42 05 34 N | 094 51 35 W |
| Carroll Little League Complex | Park | 390 | Carroll | 42 05 39 N | 094 51 57 W |
| Carroll Manor | Hospital | 379 | Carroll | 42 03 10 N | 094 51 50 W |
| Carroll Middle School | School | 392 | Carroll | 42 05 36 N | 094 51 35 W |
| Carroll Municipal Golf Course | Locale | 387 | Carroll | 42 05 10 N | 094 51 51 W |
| Carroll Post Office | Post Office | 379 | Carroll | 42 03 55 N | 094 51 49 W |
| Carrollton | Populated Place | 371 | Carroll | 41 56 59 N | 094 44 53 W |
| Carrollton Post Office (historical) | Post Office | 371 | Carroll | 41 56 59 N | 094 44 53 W |
| Carruthers Creek | Stream | | Monroe | 41 10 16 N | 093 03 17 W |
| Carrville | Locale | 305 | Floyd | 43 00 32 N | 092 34 30 W |
| Carrville | Populated Place | 305 | Floyd | 43 00 32 N | 092 34 30 W |
| Carrville Post Office (historical) | Post Office | 305 | Floyd | 43 00 32 N | 092 34 28 W |
| Carson | Populated Place | 351 | Pottawattamie | 41 14 12 N | 095 25 05 W |
| Carson (historical) | Locale | 351 | Pottawattamie | 41 14 12 N | 095 25 05 W |
| Carson Cemetery | Cemetery | 369 | Pottawattamie | 41 14 21 N | 095 24 17 W |
| Carson City Hall | Building | 351 | Pottawattamie | 41 14 12 N | 095 25 05 W |
| Carson Creek | Stream | | Jasper | 41 35 14 N | 093 02 59 W |
| Carson Fire Department | Building | 351 | Pottawattamie | 41 14 12 N | 095 25 05 W |
| Carson Landing Strip | Airport | 259 | Buchanan | 42 18 15 N | 091 42 41 W |
| Carson Post Office | Post Office | 351 | Pottawattamie | 41 14 12 N | 095 25 05 W |
| Carson Presbyterian Church | Church | 351 | Pottawattamie | 41 14 12 N | 095 25 05 W |
| Carson's Point Post Office (historical) | Post Office | 351 | Boone | 42 11 18 N | 093 59 59 W |
| Carstens 1880 Farmstead | Locale | 389 | Pottawattamie | 41 29 34 N | 095 27 06 W |
| Carter (historical) | Locale | 217 | Iowa | 41 32 24 N | 092 02 47 W |
| Carter Burial Plot | Cemetery | 201 | Des Moines | 40 45 40 N | 091 14 51 W |
| Carter Cemetery | Cemetery | 220 | Des Moines | 40 55 34 N | 091 18 45 W |
| Carter Creek | Stream | | Plymouth | 42 38 50 N | 096 16 50 W |
| Carter House Museum | Building | 233 | Clayton | 42 51 19 N | 091 24 07 W |
| Carter Lake | Populated Place | 299 | Pottawattamie | 41 17 26 N | 095 55 05 W |
| Carter Lake Elementary School | School | 298 | Pottawattamie | 41 17 30 N | 095 54 53 W |
| Carter Landing Strip | Airport | 226 | Van Buren | 40 48 30 N | 091 48 31 W |
| Carter Post Office (historical) | Post Office | 217 | Iowa | 41 32 24 N | 092 02 01 W |
| Cartersville | Populated Place | 360 | Cerro Gordo | 42 59 40 N | 093 04 59 W |
| Cartersville (historical) | Locale | 360 | Cerro Gordo | 42 59 40 N | 093 05 13 W |
| Cartersville Elevator Incorporated Elevator | Locale | 360 | Cerro Gordo | 42 59 40 N | 093 04 59 W |
| Cartersville Post Office (historical) | Post Office | 360 | Cerro Gordo | 42 59 40 N | 093 04 59 W |
| Carthage Post Office (historical) | Post Office | 207 | Johnson | 41 37 45 N | 091 28 01 W |
| Carthage School (historical) | School | 245 | Johnson | 41 40 14 N | 091 25 30 W |
| Cartwright Hall | Building | 293 | Polk | 41 36 08 N | 093 39 11 W |
| Cartwright Park | Park | 232 | Des Moines | 41 00 39 N | 091 09 44 W |
| Carver Cultural Center | Building | 293 | Warren | 41 22 00 N | 093 34 01 W |
| Carver Hall | Building | 291 | Story | 42 01 31 N | 093 38 55 W |
| Carver Science Center | Building | 295 | Warren | 41 21 50 N | 093 33 48 W |
| Carver-Hawkeye Arena | Building | 208 | Johnson | 41 39 50 N | 091 33 18 W |
| Cary School | Locale | 262 | Polk | 41 35 25 N | 093 35 56 W |
| Casady Post Office (historical) | Post Office | 346 | Webster | 42 13 25 N | 094 01 01 W |
| Cascade | Populated Place | 252 | Dubuque | 42 17 55 N | 091 00 54 W |
| Cascade Bridge | Bridge | 186 | Des Moines | 40 46 53 N | 091 05 53 W |
| Cascade City Hall | Building | 251 | Dubuque | 42 17 57 N | 091 00 54 W |
| Cascade Elementary School | School | 262 | Dubuque | 42 18 01 N | 091 00 31 W |
| Cascade Family Health Center | Hospital | 252 | Dubuque | 42 18 08 N | 091 01 11 W |
| Cascade Fire Department | Building | 260 | Dubuque | 42 18 02 N | 091 00 35 W |
| Cascade High School | School | 252 | Dubuque | 42 18 03 N | 091 01 11 W |
| Cascade Police Department | Building | 260 | Dubuque | 42 18 02 N | 091 00 35 W |
| Cascade Post Office | Post Office | 249 | Dubuque | 42 17 57 N | 091 00 59 W |
| Cascade Protestant Cemetery | Cemetery | 278 | Dubuque | 42 17 50 N | 091 01 26 W |
| Cascade Public Library | Building | 260 | Dubuque | 42 18 02 N | 091 00 35 W |
| Case Field | Park | 230 | Washington | 41 17 31 N | 091 40 55 W |
| Case Lake | Lake | 238 | Polk | 41 33 53 N | 093 33 51 W |
| Casebeer Park | Park | 254 | Black Hawk | 42 27 31 N | 092 15 51 W |
| Casey | Locale | 377 | Guthrie | 41 30 17 N | 094 31 06 W |
| Casey | Populated Place | 377 | Guthrie | 41 30 18 N | 094 31 10 W |
| Casey Barrow Landing | Locale | 161 | Des Moines | 40 56 30 N | 090 58 09 W |
| Casey City Park | Park | 388 | Guthrie | 41 30 33 N | 094 31 00 W |
| Casey Community Building | Building | 377 | Guthrie | 41 30 18 N | 094 31 10 W |
| Casey Fire Hall | Building | 377 | Guthrie | 41 30 23 N | 094 31 23 W |
| Casey Museum | Building | 377 | Guthrie | 41 30 18 N | 094 31 10 W |
| Casey Post Office | Post Office | 377 | Guthrie | 41 30 18 N | 094 31 10 W |
| Cash Cemetery | Cemetery | 288 | Decatur | 40 43 47 N | 093 52 54 W |
| Casino Beach | Beach | 427 | Buena Vista | 42 37 34 N | 095 13 40 W |
| Casino Beach | Populated Place | 433 | Buena Vista | 42 37 27 N | 095 13 43 W |
| Cass | Populated Place | 292 | Jones | 42 11 41 N | 091 20 45 W |
| Cass Bay | Cape | 426 | Dickinson | 43 22 01 N | 095 08 21 W |
| Cass Cemetery | Cemetery | 234 | Cedar | 41 47 30 N | 091 15 31 W |
| Cass Center Church | Church | 298 | Jones | 42 10 06 N | 091 18 40 W |
| Cass Centre | Locale | 392 | Cass | 41 20 00 N | 094 55 36 W |
| Cass Centre Post Office (historical) | Post Office | 386 | Cass | 41 18 00 N | 094 56 01 W |
| Cass Centre Post Office (historical) | Post Office | 271 | Jones | 42 09 05 N | 091 18 21 W |