Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Corwith (historical) | Locale | 358 | Hancock | 42 59 30 N | 093 57 23 W |
| Corwith Cemetery | Cemetery | 354 | Hancock | 42 59 37 N | 093 56 45 W |
| Corwith Post Office | Post Office | 359 | Hancock | 42 59 34 N | 093 57 27 W |
| Corwith Public Library | Building | 359 | Hancock | 42 59 34 N | 093 57 27 W |
| Corwith Town Hall | Building | 359 | Hancock | 42 59 34 N | 093 57 27 W |
| Corwith-Wesley High School | School | 357 | Hancock | 42 59 21 N | 093 57 19 W |
| Cory (historical) | Locale | 259 | Keokuk | 41 25 45 N | 092 21 21 W |
| Cory Grove Cemetery | Cemetery | 378 | Sac | 42 23 36 N | 094 58 45 W |
| Cory Grove Church | Church | 270 | Polk | 41 47 17 N | 093 28 41 W |
| Cory Marsh State Game Management Area | Park | 435 | Dickinson | 43 27 27 N | 095 16 49 W |
| Cory Post Office (historical) | Post Office | 333 | Fremont | 40 46 40 N | 095 26 29 W |
| Cory Post Office (historical) | Post Office | 259 | Keokuk | 41 25 45 N | 092 21 21 W |
| Cory School | School | 310 | Lucas | 41 01 44 N | 093 20 44 W |
| Cory School | School | 309 | Lucas | 41 01 45 N | 093 20 43 W |
| Corydon | Locale | 332 | Wayne | 40 45 42 N | 093 19 39 W |
| Corydon | Populated Place | 333 | Wayne | 40 45 25 N | 093 19 08 W |
| Corydon (historical) | Populated Place | 286 | Polk | 41 44 51 N | 093 41 15 W |
| Corydon Bible Church | Church | 327 | Wayne | 40 45 47 N | 093 19 06 W |
| Corydon Bridge (historical) | Bridge | 253 | Polk | 41 44 45 N | 093 42 38 W |
| Corydon Cemetery | Cemetery | 328 | Wayne | 40 45 00 N | 093 19 31 W |
| Corydon City Hall | Building | 328 | Wayne | 40 45 24 N | 093 18 43 W |
| Corydon Dental Clinic | Hospital | 321 | Wayne | 40 45 12 N | 093 19 03 W |
| Corydon Elementary School | School | 330 | Wayne | 40 45 06 N | 093 19 16 W |
| Corydon Fire Department | Building | 333 | Wayne | 40 45 25 N | 093 19 08 W |
| Corydon Lake | Reservoir | 314 | Wayne | 40 45 01 N | 093 19 53 W |
| Corydon Lake County Park | Park | 325 | Wayne | 40 45 10 N | 093 20 11 W |
| Corydon Medical Clinic | Hospital | 331 | Wayne | 40 45 15 N | 093 18 41 W |
| Corydon Municipal Golf Course | Locale | 325 | Wayne | 40 45 02 N | 093 18 46 W |
| Corydon Nursing and Rehab Center | Hospital | 326 | Wayne | 40 45 15 N | 093 18 32 W |
| Corydon Post Office | Post Office | 333 | Wayne | 40 45 29 N | 093 19 12 W |
| Corydon Vision Center | Hospital | 333 | Wayne | 40 45 26 N | 093 19 11 W |
| Cosgrove | Populated Place | 245 | Johnson | 41 38 34 N | 091 44 09 W |
| Cosgrove Hall | Building | 214 | Scott | 41 32 20 N | 090 34 47 W |
| Cosgrove Post Office (historical) | Post Office | 245 | Johnson | 41 38 34 N | 091 44 09 W |
| Coster | Populated Place | 295 | Butler | 42 40 18 N | 092 42 42 W |
| Coster Cemetery | Cemetery | 308 | Butler | 42 40 30 N | 092 42 45 W |
| Coster Post Office (historical) | Post Office | 295 | Butler | 42 40 18 N | 092 42 42 W |
| Cota Creek | Stream | | Allamakee | 43 11 33 N | 091 09 30 W |
| Cottage | Locale | 340 | Hardin | 42 24 16 N | 093 18 37 W |
| Cottage Avenue Grove Presbyterian Church | Church | 293 | Polk | 41 35 50 N | 093 38 59 W |
| Cottage Cemetery | Cemetery | 338 | Hardin | 42 24 18 N | 093 18 49 W |
| Cottage Community Church | Church | 344 | Hardin | 42 23 50 N | 093 18 31 W |
| Cottage Hill | Populated Place | 348 | Dubuque | 42 35 07 N | 090 54 49 W |
| Cottage Hill Christian Cemetery | Cemetery | 344 | Dubuque | 42 35 01 N | 090 55 03 W |
| Cottage Hill Post Office (historical) | Post Office | 348 | Dubuque | 42 35 07 N | 090 54 49 W |
| Cottage Hill Protestant Cemetery | Cemetery | 348 | Dubuque | 42 35 10 N | 090 54 45 W |
| Cottage Hill School | Locale | 332 | Dubuque | 42 34 20 N | 090 55 00 W |
| Cottage Post Office (historical) | Post Office | 340 | Hardin | 42 24 16 N | 093 18 37 W |
| Cotter | Locale | 217 | Louisa | 41 17 31 N | 091 27 42 W |
| Cotter | Populated Place | 217 | Louisa | 41 17 31 N | 091 27 42 W |
| Cotter Church | Church | 223 | Louisa | 41 17 16 N | 091 27 57 W |
| Cotter Elementary School | School | 217 | Louisa | 41 17 35 N | 091 27 59 W |
| Cotter Post Office (historical) | Post Office | 217 | Louisa | 41 17 31 N | 091 27 42 W |
| Cotton Creek | Stream | | Warren | 41 10 53 N | 093 22 13 W |
| Cotton Grove Post Office (historical) | Post Office | 218 | Henry | 41 00 57 N | 091 26 20 W |
| Cotton Grove Post Office (historical) | Post Office | 241 | Jefferson | 40 57 26 N | 092 10 19 W |
| Cottonville | Populated Place | 305 | Jackson | 42 14 13 N | 090 36 07 W |
| Cottonville Cemetery | Cemetery | 305 | Jackson | 42 14 11 N | 090 36 15 W |
| Cottonville Post Office (historical) | Post Office | 305 | Jackson | 42 14 13 N | 090 36 07 W |
| Cottonwood (historical) | Locale | 216 | Lee | 40 47 32 N | 091 38 31 W |
| Cottonwood Cemetery | Cemetery | 339 | Calhoun | 42 14 57 N | 094 47 38 W |
| Cottonwood Cemetery | Cemetery | 223 | Henry | 41 08 56 N | 091 42 10 W |
| Cottonwood Cemetery | Cemetery | 219 | Lee | 40 47 30 N | 091 39 01 W |
| Cottonwood Cemetery | Cemetery | 333 | Mills | 41 05 04 N | 095 31 01 W |
| Cottonwood Church | Church | 223 | Henry | 41 08 56 N | 091 42 10 W |
| Cottonwood Creek | Stream | | Buena Vista | 42 53 21 N | 095 18 43 W |
| Cottonwood Creek | Stream | | Monona | 41 58 17 N | 095 58 28 W |
| Cottonwood Creek | Stream | | Monona | 42 04 51 N | 095 54 36 W |
| Cottonwood Ditch | Canal | 329 | Woodbury | 42 12 51 N | 096 02 12 W |
| Cottonwood Drain | Stream | | Des Moines | 40 53 47 N | 091 01 34 W |
| Cottonwood Hollow | Valley | | Woodbury | 42 12 56 N | 096 01 40 W |
| Cottonwood Park | Park | 210 | Des Moines | 40 48 44 N | 091 08 14 W |
| Cottonwood Pits State Game Management Area | Park | 294 | Monroe | 40 58 38 N | 092 47 11 W |
| Cottonwood Point | Cape | 427 | Dickinson | 43 29 41 N | 095 04 06 W |
| Cottonwood Point | Cape | 372 | Sac | 42 17 45 N | 095 01 24 W |
| Cottonwood Post Office (historical) | Post Office | 216 | Lee | 40 47 32 N | 091 38 31 W |
| Cottonwood Trail | Trail | 326 | Humboldt | 42 43 22 N | 094 13 44 W |
| Cou Falls | Locale | 223 | Johnson | 41 49 02 N | 091 40 22 W |
| Cou Falls | Populated Place | 223 | Johnson | 41 49 02 N | 091 40 22 W |
| Cou Falls Post Office (historical) | Post Office | 223 | Johnson | 41 49 02 N | 091 40 22 W |
| Coulee Creek | Stream | | Fayette | 42 49 45 N | 091 49 31 W |
| Couler Valley | Valley | | Dubuque | 42 33 35 N | 090 42 33 W |
| Coulson Post Office | Post Office | 417 | Cherokee | 42 36 18 N | 095 26 46 W |
| Coulter | Locale | 378 | Franklin | 42 44 18 N | 093 22 12 W |
| Coulter | Populated Place | 378 | Franklin | 42 44 14 N | 093 22 12 W |
| Coulter Cemetery | Cemetery | 378 | Franklin | 42 44 20 N | 093 22 19 W |
| Coulter Community Center | Building | 378 | Franklin | 42 44 14 N | 093 22 12 W |
| Coulter Post Office | Post Office | 378 | Franklin | 42 44 14 N | 093 22 12 W |
| Coulter Public Library | Building | 378 | Franklin | 42 44 14 N | 093 22 12 W |
| Coulter Town Hall | Building | 378 | Franklin | 42 44 14 N | 093 22 12 W |
| Council Bend | Bend | 293 | Pottawattamie | 41 16 09 N | 095 55 14 W |
| Council Bluffs | Populated Place | 301 | Pottawattamie | 41 15 43 N | 095 51 40 W |
| Council Bluffs Bible Chapel | Church | 301 | Pottawattamie | 41 15 59 N | 095 51 23 W |
| Council Bluffs City Hall | Building | 304 | Pottawattamie | 41 15 29 N | 095 51 03 W |
| Council Bluffs Community Hall | Building | 305 | Pottawattamie | 41 15 29 N | 095 51 01 W |
| Council Bluffs Community Health Center | Hospital | 311 | Pottawattamie | 41 15 50 N | 095 50 53 W |
| Council Bluffs Drive-In-Theatre | Locale | 298 | Pottawattamie | 41 13 15 N | 095 51 41 W |
| Council Bluffs Fire Department | Building | 307 | Pottawattamie | 41 15 29 N | 095 50 58 W |
| Council Bluffs Gospel Assembly Church | Church | 299 | Pottawattamie | 41 15 44 N | 095 52 33 W |
| Council Bluffs Medical Mall | Hospital | 317 | Pottawattamie | 41 14 20 N | 095 49 36 W |
| Council Bluffs Municipal Airport | Airport | 380 | Pottawattamie | 41 15 31 N | 095 45 38 W |
| Council Bluffs Police Department | Building | 303 | Pottawattamie | 41 15 26 N | 095 51 11 W |
| Council Bluffs Post Office | Post Office | 304 | Pottawattamie | 41 15 39 N | 095 51 09 W |
| Council Bluffs Public Library | Building | 304 | Pottawattamie | 41 15 29 N | 095 51 04 W |
| Council Hill Cemetery | Cemetery | 349 | Clayton | 43 04 19 N | 091 18 00 W |
| Council Hill Post Office (historical) | Post Office | 331 | Clayton | 43 03 55 N | 091 16 20 W |
| Country Aire Home Park | Populated Place | 259 | Benton | 41 59 45 N | 091 52 21 W |
| Country Aire Mobile Home Park | Populated Place | 327 | Boone | 42 01 60 N | 093 58 36 W |
| Country Church | Church | 355 | Monona | 41 59 07 N | 095 46 46 W |
| Country Club | Locale | 393 | Adair | 41 17 55 N | 094 29 11 W |