Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Burt Elementary School | School | 359 | Kossuth | 43 12 01 N | 094 13 19 W |
| Burt Post Office | Post Office | 360 | Kossuth | 43 11 51 N | 094 13 11 W |
| Burt Public Library | Building | 360 | Kossuth | 43 11 51 N | 094 13 11 W |
| Burt Township Cemetery | Cemetery | 362 | Kossuth | 43 12 15 N | 094 13 17 W |
| Burton Avenue Baptist Church | Church | 261 | Black Hawk | 42 30 51 N | 092 21 26 W |
| Burton Farm Grounds Cemetery | Cemetery | 210 | Lee | 40 39 10 N | 091 17 51 W |
| Burton Payne Library | Building | 318 | Dubuque | 42 26 45 N | 090 51 00 W |
| Busch Cemetery | Cemetery | 269 | Clinton | 41 59 59 N | 090 46 56 W |
| Bush Branch | Stream | | Madison | 41 18 39 N | 094 12 47 W |
| Bush Lake (historical) | Lake | 384 | Sac | 42 31 58 N | 095 00 29 W |
| Bush Post Office (historical) | Post Office | 237 | Jasper | 41 39 44 N | 093 08 13 W |
| Bushmer Art Center | Building | 434 | Sioux | 42 59 57 N | 096 03 39 W |
| Bushville | Populated Place | 353 | Taylor | 40 51 24 N | 094 44 18 W |
| Bushy Creek Campground | Locale | 295 | Webster | 42 22 35 N | 093 58 41 W |
| Business Corners (historical) | Populated Place | 216 | Van Buren | 40 51 16 N | 092 14 38 W |
| Business Office | Building | 446 | Sioux | 43 04 56 N | 096 10 06 W |
| Buss Creek | Stream | | Crawford | 41 54 48 N | 095 33 19 W |
| Bussey | Locale | 267 | Marion | 41 12 24 N | 092 53 03 W |
| Bussey | Populated Place | 259 | Marion | 41 12 16 N | 092 52 58 W |
| Bussey City Hall | Building | 260 | Marion | 41 12 18 N | 092 52 58 W |
| Bussey Community Library | Building | 260 | Marion | 41 12 18 N | 092 52 58 W |
| Bussey Family Health Center | Hospital | 260 | Marion | 41 12 18 N | 092 52 58 W |
| Bussey Post Office | Post Office | 260 | Marion | 41 12 18 N | 092 52 58 W |
| Butcher Cemetery | Cemetery | 219 | Des Moines | 40 57 29 N | 091 15 25 W |
| Butcher Creek | Stream | | Marion | 41 20 16 N | 093 09 44 W |
| Butcher Creek | Stream | | Warren | 41 28 57 N | 093 24 07 W |
| Butcher School | School | 287 | Monroe | 41 05 16 N | 093 02 24 W |
| Butler | Locale | 312 | Butler | 42 42 21 N | 092 57 06 W |
| Butler | Locale | 247 | Keokuk | 41 11 12 N | 092 21 15 W |
| Butler Cemetery | Cemetery | 359 | Crawford | 41 56 11 N | 095 27 47 W |
| Butler Cemetery | Cemetery | 360 | Fayette | 42 58 30 N | 091 45 03 W |
| Butler Cemetery | Cemetery | 208 | Lee | 40 38 21 N | 091 38 29 W |
| Butler Cemetery | Cemetery | 250 | Mahaska | 41 18 36 N | 092 45 53 W |
| Butler Cemetery | Cemetery | 328 | Page | 40 38 16 N | 095 02 36 W |
| Butler Center | Populated Place | 318 | Butler | 42 41 51 N | 092 47 01 W |
| Butler Center Cemetery | Cemetery | 311 | Butler | 42 42 00 N | 092 46 21 W |
| Butler Center Post Office (historical) | Post Office | 318 | Butler | 42 41 50 N | 092 47 01 W |
| Butler Chiropractic Clinic | Hospital | 293 | Warren | 41 21 28 N | 093 34 29 W |
| Butler County | Civil | 313 | Butler | 42 44 00 N | 092 47 01 W |
| Butler County Courthouse | Building | 323 | Butler | 42 45 23 N | 092 47 42 W |
| Butler County Fairgrounds | Locale | 317 | Butler | 42 44 55 N | 092 47 31 W |
| Butler County Home | Building | 314 | Butler | 42 44 32 N | 092 43 56 W |
| Butler County Poor Farm Cemetery | Cemetery | 311 | Butler | 42 44 35 N | 092 43 59 W |
| Butler County Sheriffs Office | Building | 323 | Butler | 42 45 23 N | 092 47 42 W |
| Butler Drain | Stream | | Des Moines | 41 02 43 N | 091 00 18 W |
| Butler Hall | Building | 281 | Black Hawk | 42 25 53 N | 092 19 51 W |
| Butler Lake | Lake | 187 | Allamakee | 43 12 29 N | 091 07 25 W |
| Butler Post Office (historical) | Post Office | 252 | Keokuk | 41 11 05 N | 092 20 54 W |
| Butler School | School | 342 | Webster | 42 29 36 N | 094 10 22 W |
| Butlerville | Locale | 268 | Tama | 42 00 22 N | 092 43 49 W |
| Butlerville Cemetery | Cemetery | 289 | Tama | 41 59 49 N | 092 43 50 W |
| Butlerville Post Office (historical) | Post Office | 268 | Tama | 42 00 22 N | 092 43 49 W |
| Butrick Bluff Wildlife Area | Park | 329 | Carroll | 42 06 30 N | 094 40 03 W |
| Butter Creek | Stream | | Davis | 40 48 27 N | 092 21 34 W |
| Buttermilk Creek | Stream | | Wright | 42 44 15 N | 093 55 25 W |
| Butternut Hollow | Valley | | Clayton | 42 50 15 N | 091 08 00 W |
| Buttrick Creek | Stream | | Greene | 41 58 19 N | 094 18 30 W |
| Buxton | Populated Place | 237 | Monroe | 41 09 30 N | 092 49 17 W |
| Buxton (historical) | Locale | 237 | Monroe | 41 09 30 N | 092 49 17 W |
| Buxton Cemetery | Cemetery | 244 | Monroe | 41 09 39 N | 092 49 48 W |
| Buxton Park | Park | 293 | Warren | 41 22 01 N | 093 33 50 W |
| Buxton Park Arboretum | Park | 293 | Warren | 41 22 01 N | 093 33 50 W |
| Buxton Post Office (historical) | Post Office | 237 | Monroe | 41 09 30 N | 092 49 17 W |
| Buxton Residence Hall | Building | 293 | Warren | 41 21 50 N | 093 33 51 W |
| Buxton State Historical Marker | Park | 278 | Monroe | 41 08 09 N | 092 54 15 W |
| Buxton Tennis Courts | Building | 289 | Warren | 41 22 04 N | 093 34 11 W |
| Buzzard Creek | Stream | | Appanoose | 40 53 15 N | 092 41 48 W |
| Buzzard Ridge Wildlife Area | Park | 213 | Jackson | 42 08 45 N | 090 52 21 W |
| Bybee Cemetery | Cemetery | 258 | Marion | 41 18 50 N | 093 02 01 W |
| Bycroft Landing Field | Airport | 386 | Taylor | 40 52 29 N | 094 46 56 W |
| Byers Branch | Stream | | Jasper | 41 47 03 N | 093 17 03 W |
| Byers Cemetery | Cemetery | 273 | Polk | 41 47 14 N | 093 28 42 W |
| Byrantburg Post Office (historical) | Post Office | 301 | Buchanan | 42 34 29 N | 091 54 20 W |
| Byrne Oaks Complex | Building | 235 | Dubuque | 42 30 24 N | 090 40 53 W |
| Byrnes Park | Park | 264 | Black Hawk | 42 28 49 N | 092 22 18 W |
| Byron Cemetery | Cemetery | 321 | Buchanan | 42 31 38 N | 091 43 40 W |
| Byron Post Office (historical) | Post Office | 343 | Humboldt | 42 54 25 N | 094 10 21 W |
| Byron Sergeant Memorial Park | Park | 268 | Black Hawk | 42 25 15 N | 092 26 26 W |
| C A Block Wildlife Area | Park | 372 | Winnebago | 43 21 55 N | 093 37 26 W |
| C and M Elementary School | School | 392 | Cass | 41 16 25 N | 094 52 06 W |
| C and M Junior-Senior High School | School | 404 | Cass | 41 15 24 N | 094 46 02 W |
| C Baker County Park | Park | 305 | Winneshiek | 43 25 18 N | 091 56 11 W |
| C C Carpenter Cemetery | Cemetery | 342 | Webster | 42 30 06 N | 094 12 60 W |
| C Earl Page Park | Park | 404 | Clay | 43 09 07 N | 095 09 51 W |
| C J Jack Farm Cemetery | Cemetery | 356 | Winneshiek | 43 06 60 N | 092 03 01 W |
| Cabaret Cemetery | Cemetery | 365 | Ringgold | 40 47 54 N | 094 23 10 W |
| Cable Car Square | Locale | 260 | Dubuque | 42 29 42 N | 090 40 38 W |
| Caboose Park | Park | 293 | Dallas | 41 50 20 N | 094 06 25 W |
| Cackler School | School | 300 | Lucas | 41 06 57 N | 093 25 19 W |
| Cadda (historical) | Locale | 195 | Scott | 41 45 24 N | 090 37 51 W |
| Cadda Post Office (historical) | Post Office | 195 | Scott | 41 45 24 N | 090 37 51 W |
| Cadet Field | Park | 346 | Hardin | 42 32 05 N | 093 15 56 W |
| CADSI Building | Building | 244 | Johnson | 41 42 40 N | 091 36 23 W |
| Cady Cemetery | Cemetery | 282 | Jones | 42 04 59 N | 090 57 57 W |
| Cagley Cemetery | Cemetery | 305 | Chickasaw | 42 59 09 N | 092 29 46 W |
| Cairo | Populated Place | 219 | Louisa | 41 11 01 N | 091 19 39 W |
| Cairo Cemetery | Cemetery | 211 | Louisa | 41 10 32 N | 091 19 52 W |
| Cairo Gas Storage Field | Oilfield | 187 | Louisa | 41 11 56 N | 091 19 23 W |
| Cairo Lake (historical) | Lake | 324 | Hamilton | 42 20 41 N | 093 43 14 W |
| Cairo Post Office (historical) | Post Office | 219 | Louisa | 41 11 01 N | 091 19 39 W |
| Cairo Woods Wildlife Area | Park | 190 | Louisa | 41 12 23 N | 091 20 36 W |
| Cal Community School | School | 379 | Franklin | 42 45 05 N | 093 22 09 W |
| Calamus | Locale | 213 | Clinton | 41 49 33 N | 090 45 31 W |
| Calamus | Populated Place | 213 | Clinton | 41 49 33 N | 090 45 30 W |
| Calamus - Wheatland High School | School | 223 | Clinton | 41 50 15 N | 090 50 21 W |
| Calamus - Wheatland School | School | 214 | Clinton | 41 49 19 N | 090 45 32 W |
| Calamus Creek | Stream | | Carroll | 41 54 23 N | 094 42 37 W |
| Calamus Creek | Stream | | Clinton | 41 49 24 N | 090 47 60 W |
| Calamus Creek | Stream | | Kossuth | 43 09 33 N | 094 17 21 W |
| Calamus Creek | Stream | | Polk | 41 51 30 N | 093 23 18 W |