Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Barclay Post Office (historical) | Post Office | 289 | Black Hawk | 42 31 23 N | 092 05 31 W |
| Barclay Townhall | Building | 290 | Black Hawk | 42 29 01 N | 092 10 48 W |
| Bard | Populated Place | 184 | Louisa | 41 14 25 N | 091 17 16 W |
| Bard (historical) | Locale | 183 | Louisa | 41 14 27 N | 091 17 16 W |
| Bard Post Office (historical) | Post Office | 184 | Louisa | 41 14 25 N | 091 17 16 W |
| Bards Lake | Lake | 178 | Jackson | 42 05 02 N | 090 11 25 W |
| Barker Creek | Stream | | Lucas | 41 08 25 N | 093 21 07 W |
| Barker Park | Park | 293 | Warren | 41 21 24 N | 093 33 37 W |
| Barker Residence Hall | Building | 294 | Warren | 41 21 58 N | 093 33 48 W |
| Barkley Memorial State Park | Park | 334 | Boone | 42 08 36 N | 093 56 19 W |
| Barlean Creek | Stream | | Lee | 40 27 57 N | 091 29 09 W |
| Barlow Lake Drain | Stream | | Des Moines | 41 01 28 N | 090 59 41 W |
| Barner Wildlife Area Number One | Park | 315 | Hamilton | 42 23 50 N | 093 49 01 W |
| Barnes (historical) | Locale | 276 | Mahaska | 41 30 36 N | 092 28 06 W |
| Barnes Area County Park | Park | 360 | Cherokee | 42 49 50 N | 095 30 28 W |
| Barnes Cemetery | Cemetery | 360 | Winneshiek | 43 27 01 N | 092 00 32 W |
| Barnes City | Populated Place | 276 | Mahaska | 41 30 30 N | 092 28 06 W |
| Barnes City Cemetery | Cemetery | 274 | Mahaska | 41 30 12 N | 092 28 26 W |
| Barnes City Community Church | Church | 276 | Mahaska | 41 30 30 N | 092 28 06 W |
| Barnes City Fire Station | Building | 276 | Mahaska | 41 30 30 N | 092 28 06 W |
| Barnes City Hall | Building | 276 | Mahaska | 41 30 30 N | 092 28 06 W |
| Barnes City Post Office | Post Office | 276 | Mahaska | 41 30 30 N | 092 28 06 W |
| Barnes City United Methodist Church | Church | 276 | Mahaska | 41 30 30 N | 092 28 06 W |
| Barnes Township Cemetery | Cemetery | 422 | Buena Vista | 42 53 17 N | 095 14 24 W |
| Barnets Cutoff | Bend | 236 | Benton | 42 13 27 N | 092 03 07 W |
| Barnets Island | Island | 238 | Benton | 42 14 23 N | 092 02 49 W |
| Barney | Populated Place | 321 | Madison | 41 10 00 N | 094 00 14 W |
| Barney (historical) | Locale | 321 | Madison | 41 10 00 N | 094 00 14 W |
| Barney Cemetery | Cemetery | 361 | Madison | 41 09 51 N | 094 01 27 W |
| Barney Peterson Memorial Trail | Trail | 427 | Dickinson | 43 22 10 N | 095 10 28 W |
| Barney Post Office (historical) | Post Office | 321 | Madison | 41 10 00 N | 094 00 14 W |
| Barnhart - Van Peenen Park | Park | 332 | Winneshiek | 43 19 01 N | 091 46 36 W |
| Barnhouse Cemetery | Cemetery | 360 | Fayette | 42 58 30 N | 091 45 03 W |
| Barnum | Locale | 358 | Webster | 42 30 31 N | 094 21 55 W |
| Barnum | Populated Place | 358 | Webster | 42 30 31 N | 094 21 55 W |
| Barnum Post Office | Post Office | 358 | Webster | 42 30 31 N | 094 21 55 W |
| Baron House | Building | 267 | Marion | 41 24 12 N | 092 55 09 W |
| Baron Spring | Spring | 314 | Clayton | 42 43 37 N | 091 32 55 W |
| Barr School | School | 228 | Scott | 41 36 41 N | 090 28 33 W |
| Barrell | Populated Place | 302 | Decatur | 40 41 53 N | 093 52 03 W |
| Barrett Forum | Building | 278 | Black Hawk | 42 31 47 N | 092 20 23 W |
| Barrett School | Locale | 327 | Mills | 40 57 10 N | 095 35 42 W |
| Barrick Road City Park | Park | 276 | Bremer | 42 38 46 N | 092 27 47 W |
| Barringer Slough | Gut | 411 | Clay | 43 08 49 N | 094 55 56 W |
| Barringer Slough State Game Mgt Area | Park | 411 | Clay | 43 09 06 N | 094 55 48 W |
| Barrwood Post Office (historical) | Post Office | 206 | Scott | 41 43 40 N | 090 31 52 W |
| Barry Creek | Stream | | O'Brien | 43 00 52 N | 095 25 45 W |
| Barryville Post Office (historical) | Post Office | 324 | Delaware | 42 23 30 N | 091 30 41 W |
| Bartels Lutheran Home | Hospital | 290 | Bremer | 42 43 51 N | 092 29 39 W |
| Barthell Eastern Star Nursing Home | Hospital | 283 | Winneshiek | 43 17 39 N | 091 46 38 W |
| Bartlett | Locale | 286 | Fremont | 40 53 10 N | 095 47 41 W |
| Bartlett | Populated Place | 286 | Fremont | 40 53 06 N | 095 47 42 W |
| Bartlett Access | Locale | 287 | Fremont | 40 53 15 N | 095 48 29 W |
| Bartlett and Company Grain Elevator | Locale | 302 | Pottawattamie | 41 16 06 N | 095 51 33 W |
| Bartlett Field | Airport | 244 | Johnson | 41 48 02 N | 091 26 24 W |
| Bartlett Hall | Building | 284 | Black Hawk | 42 30 59 N | 092 27 34 W |
| Bartlett Hills Lake | Reservoir | 384 | Mills | 41 57 42 N | 095 46 31 W |
| Bartlett Hills Lake Dam | Dam | 317 | Mills | 40 57 42 N | 095 46 31 W |
| Bartlett Post Office (historical) | Post Office | 286 | Fremont | 40 53 06 N | 095 47 42 W |
| Bartlett State Wildlife Management Area | Park | 285 | Fremont | 40 53 30 N | 095 48 04 W |
| Bartlettville Post Office (historical) | Post Office | 332 | Clarke | 40 56 05 N | 093 39 46 W |
| Barton Hall | Building | 283 | Story | 42 01 25 N | 093 38 31 W |
| Baseball Park | Park | 279 | Black Hawk | 42 30 28 N | 092 23 35 W |
| Basilica of Saint John | Church | 285 | Polk | 41 36 03 N | 093 38 37 W |
| Baskins Run | Stream | | Bremer | 42 39 52 N | 092 23 39 W |
| Bass Creek | Stream | | Fayette | 43 04 36 N | 091 53 13 W |
| Bass Creek | Stream | | Webster | 42 36 21 N | 094 13 29 W |
| Bass Field | Park | 375 | Woodbury | 42 28 29 N | 096 21 41 W |
| Bass Lake (historical) | Lake | 348 | Humboldt | 42 41 15 N | 094 19 38 W |
| Bass Landing Field | Airport | 299 | Mills | 40 55 37 N | 095 33 25 W |
| Bass Memorial Park | Park | 322 | Mills | 41 00 58 N | 095 23 42 W |
| Bass Point Cemetery | Cemetery | 342 | Boone | 42 05 57 N | 093 53 46 W |
| Bass Point Creek | Stream | | Boone | 42 05 27 N | 093 55 60 W |
| Bassett | Locale | 316 | Chickasaw | 43 03 44 N | 092 31 01 W |
| Bassett | Populated Place | 324 | Chickasaw | 43 03 47 N | 092 30 56 W |
| Bassett Post Office (historical) | Post Office | 324 | Chickasaw | 43 03 47 N | 092 30 56 W |
| Basswood County Recreation Area | Park | 369 | Palo Alto | 43 07 53 N | 094 42 11 W |
| Basswood Creek | Stream | | Dubuque | 42 39 19 N | 090 48 28 W |
| Batavia | Locale | 222 | Jefferson | 40 59 35 N | 092 09 46 W |
| Batavia | Populated Place | 230 | Jefferson | 40 59 39 N | 092 10 03 W |
| Batavia City Ball Park and Playground | Park | 230 | Jefferson | 40 59 50 N | 092 09 60 W |
| Batavia City Cemetery | Cemetery | 229 | Jefferson | 40 59 53 N | 092 10 01 W |
| Batavia City Fire Department | Building | 230 | Jefferson | 40 59 41 N | 092 10 03 W |
| Batavia City Hall | Building | 230 | Jefferson | 40 59 41 N | 092 10 03 W |
| Batavia Peoples Church | Church | 234 | Jefferson | 41 03 54 N | 092 09 45 W |
| Batavia Post Office | Post Office | 229 | Jefferson | 40 59 39 N | 092 10 01 W |
| Batavia Public Library | Building | 230 | Jefferson | 40 59 41 N | 092 10 03 W |
| Batavia United Methodist Church | Church | 231 | Jefferson | 40 59 43 N | 092 10 03 W |
| Bath (historical) | Locale | 364 | Cerro Gordo | 43 03 30 N | 093 11 21 W |
| Bath Post Office (historical) | Post Office | 364 | Cerro Gordo | 43 03 30 N | 093 11 21 W |
| Bath School Number 9 | School | 364 | Cerro Gordo | 43 05 57 N | 093 14 28 W |
| Batten Branch | Stream | | Davis | 40 36 02 N | 092 27 14 W |
| Battin Chapel | Church | 330 | Boone | 42 02 16 N | 093 59 21 W |
| Battle Center Church | Church | 432 | Ida | 42 25 45 N | 095 36 52 W |
| Battle Creek | Populated Place | 365 | Ida | 42 18 56 N | 095 35 55 W |
| Battle Creek | Stream | | Adair | 41 19 59 N | 094 21 06 W |
| Battle Creek | Stream | | Ida | 42 19 02 N | 095 34 56 W |
| Battle Creek - Ida Grove High School | School | 395 | Ida | 42 20 10 N | 095 27 43 W |
| Battle Creek - Ida Grove Middle School | School | 366 | Ida | 42 19 12 N | 095 35 33 W |
| Battle Creek (historical) | Locale | 363 | Ida | 42 18 50 N | 095 35 51 W |
| Battle Creek City Hall | Building | 365 | Ida | 42 18 58 N | 095 35 57 W |
| Battle Creek City Police | Building | 366 | Ida | 42 18 59 N | 095 35 56 W |
| Battle Creek Elementary School | School | 367 | Ida | 42 19 04 N | 095 36 03 W |
| Battle Creek Fire Station | Building | 366 | Ida | 42 18 59 N | 095 35 56 W |
| Battle Creek Post Office | Post Office | 365 | Ida | 42 18 58 N | 095 35 57 W |
| Battle Creek Public Library | Building | 365 | Ida | 42 18 58 N | 095 35 57 W |
| Battle Hill | Summit | 388 | Ida | 42 19 43 N | 095 35 07 W |
| Battle Hill Museum of Natural History | Building | 366 | Ida | 42 19 05 N | 095 35 38 W |
| Battle of Credit Island Historical Marker | Park | 168 | Scott | 41 30 02 N | 090 36 30 W |
| Battle Run | Stream | | Guthrie | 41 46 35 N | 094 29 46 W |