Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Border Plains Post Office (historical) | Post Office | 332 | Webster | 42 23 53 N | 094 02 53 W |
| Born Cemetery | Cemetery | 301 | Story | 42 07 21 N | 093 35 27 W |
| Bos Landen Golf Club | Locale | 244 | Marion | 41 23 30 N | 092 57 21 W |
| Boston Cemetery | Cemetery | 215 | Louisa | 41 20 11 N | 091 25 35 W |
| Boston Cemetery | Cemetery | 225 | Van Buren | 40 42 10 N | 092 00 08 W |
| Boswell Brothers Elevator | Locale | 286 | Decatur | 40 38 21 N | 093 48 42 W |
| Boswell Cemetery | Cemetery | 299 | Appanoose | 40 35 53 N | 092 53 45 W |
| Botany | Locale | 381 | Shelby | 41 40 55 N | 095 12 27 W |
| Botany Plant House | Building | 217 | Johnson | 41 39 37 N | 091 32 59 W |
| Botany Post Office (historical) | Post Office | 373 | Shelby | 41 41 15 N | 095 12 27 W |
| Botna | Populated Place | 400 | Shelby | 41 51 21 N | 095 07 53 W |
| Botna (historical) | Locale | 396 | Shelby | 41 51 20 N | 095 08 06 W |
| Botna Bend County Park | Park | 337 | Pottawattamie | 41 23 45 N | 095 21 46 W |
| Botna Post Office (historical) | Post Office | 400 | Shelby | 41 51 21 N | 095 07 53 W |
| Bouchey Eye Surgery Center | Hospital | 214 | Henry | 40 57 43 N | 091 33 36 W |
| Boulder Cemetery | Cemetery | 290 | Linn | 42 12 10 N | 091 27 15 W |
| Boulder Church | Church | 259 | Black Hawk | 42 30 05 N | 092 20 14 W |
| Boulder Creek | Stream | | Linn | 42 14 06 N | 091 27 45 W |
| Boulder Post Office (historical) | Post Office | 289 | Linn | 42 15 10 N | 091 22 11 W |
| Bouska Log School (historical) | School | 326 | Winneshiek | 43 12 18 N | 091 57 04 W |
| Bouton | Populated Place | 288 | Dallas | 41 51 05 N | 094 00 33 W |
| Bouton (historical) | Locale | 290 | Dallas | 41 51 10 N | 094 00 33 W |
| Bouton City Hall | Building | 288 | Dallas | 41 51 05 N | 094 00 33 W |
| Bouton City Police Department | Building | 288 | Dallas | 41 51 05 N | 094 00 33 W |
| Bouton Fire Department | Building | 288 | Dallas | 41 51 05 N | 094 00 33 W |
| Bouton Post Office | Post Office | 288 | Dallas | 41 51 05 N | 094 00 33 W |
| Bovina (historical) | Locale | 274 | Tama | 42 17 11 N | 092 26 31 W |
| Bovina Post Office (historical) | Post Office | 279 | Tama | 42 16 30 N | 092 27 26 W |
| Bowen Cemetery | Cemetery | 404 | Audubon | 41 30 41 N | 094 51 30 W |
| Bowen Cemetery | Cemetery | 244 | Wapello | 41 02 30 N | 092 32 01 W |
| Bowen Post Office (historical) | Post Office | 299 | Jones | 42 16 55 N | 091 07 21 W |
| Bowen Science Building | Building | 214 | Johnson | 41 39 40 N | 091 32 41 W |
| Bowens Prairie | Locale | 301 | Jones | 42 16 55 N | 091 07 16 W |
| Bowens Prairie Cemetery | Cemetery | 300 | Jones | 42 16 56 N | 091 06 56 W |
| Bower Cemetery | Cemetery | 306 | Greene | 41 51 56 N | 094 10 42 W |
| Bower Cemetery | Cemetery | 371 | Taylor | 40 41 30 N | 094 36 51 W |
| Bowers-Dannatt-Hill Cemetery | Cemetery | 204 | Clinton | 41 47 39 N | 090 22 39 W |
| Bowles Cemetery | Cemetery | 277 | Marshall | 42 02 30 N | 092 48 51 W |
| Bowman Cemetery | Cemetery | 203 | Lee | 40 37 29 N | 091 35 35 W |
| Bowman Chapel | Church | 429 | Guthrie | 41 39 38 N | 094 43 32 W |
| Bowman House Admission Visitors Center | Building | 215 | Johnson | 41 39 52 N | 091 32 04 W |
| Bowman Woods Elementary School | School | 250 | Linn | 42 02 40 N | 091 37 43 W |
| Bowman-Carter Residence Hall | Building | 275 | Linn | 41 55 33 N | 091 25 29 W |
| Bowmans Grove | Cemetery | 409 | Shelby | 41 39 42 N | 095 12 48 W |
| Bowsher | Populated Place | 256 | Polk | 41 38 21 N | 093 32 31 W |
| Box Elder Creek | Stream | | Warren | 41 14 20 N | 093 42 08 W |
| Box Elder School | School | 323 | Lucas | 41 03 03 N | 093 32 30 W |
| Box Groves Cemetery | Cemetery | 175 | Lee | 40 38 30 N | 091 18 21 W |
| Boxelder Post Office (historical) | Post Office | 337 | Mills | 41 09 35 N | 095 32 36 W |
| Boxelder School | School | 329 | Mills | 41 08 45 N | 095 31 22 W |
| Boxholm | Populated Place | 349 | Boone | 42 10 33 N | 094 06 22 W |
| Boxholm (historical) | Locale | 350 | Boone | 42 10 40 N | 094 06 21 W |
| Boxholm Fire Department | Building | 349 | Boone | 42 10 33 N | 094 06 22 W |
| Boxholm Post Office | Post Office | 349 | Boone | 42 10 33 N | 094 06 22 W |
| Boxholm Town Hall | Building | 349 | Boone | 42 10 33 N | 094 06 22 W |
| Boy Scout Islands | Island | 180 | Jackson | 42 06 56 N | 090 10 00 W |
| Boyd | Populated Place | 347 | Chickasaw | 43 00 45 N | 092 15 29 W |
| Boyd (historical) | Locale | 345 | Chickasaw | 43 00 45 N | 092 15 43 W |
| Boyd and Peevler Cemetery | Cemetery | 207 | Lee | 40 30 50 N | 091 26 31 W |
| Boyd Branch | Stream | | Appanoose | 40 53 13 N | 092 39 49 W |
| Boyd Cemetery | Cemetery | 357 | Chickasaw | 43 00 16 N | 092 13 44 W |
| Boyd Cemetery | Cemetery | 210 | Clinton | 41 47 34 N | 090 45 06 W |
| Boyd Law Building | Building | 209 | Johnson | 41 39 28 N | 091 32 34 W |
| Boyd Post Office (historical) | Post Office | 347 | Chickasaw | 43 00 45 N | 092 15 29 W |
| Boyden | Populated Place | 433 | Sioux | 43 11 28 N | 096 00 21 W |
| Boyden (historical) | Locale | 434 | Sioux | 43 11 22 N | 096 00 19 W |
| Boyden Cemetery | Cemetery | 435 | Sioux | 43 12 17 N | 096 01 15 W |
| Boyden Elementary School | School | 433 | Sioux | 43 11 25 N | 096 00 09 W |
| Boyden Post Office | Post Office | 433 | Sioux | 43 11 29 N | 096 00 20 W |
| Boyden Public Library | Building | 433 | Sioux | 43 11 29 N | 096 00 20 W |
| Boyden Recreation Area | Park | 411 | Sioux | 43 15 08 N | 096 00 19 W |
| Boyden-Hull High School | School | 439 | Sioux | 43 11 22 N | 096 08 09 W |
| Boyer | Locale | 368 | Crawford | 42 10 38 N | 095 13 58 W |
| Boyer | Populated Place | 377 | Crawford | 42 10 55 N | 095 14 07 W |
| Boyer (historical) | Locale | 184 | Van Buren | 40 38 15 N | 091 47 11 W |
| Boyer (historical) | Post Office | 184 | Van Buren | 40 38 15 N | 091 47 11 W |
| Boyer Bend | Bend | 296 | Pottawattamie | 41 26 55 N | 095 55 14 W |
| Boyer Cemetery | Cemetery | 236 | Monroe | 41 07 56 N | 092 57 58 W |
| Boyer Cemetery | Cemetery | 181 | Van Buren | 40 38 17 N | 091 47 14 W |
| Boyer Creek | Stream | | Sac | 42 31 35 N | 095 12 12 W |
| Boyer Ditch | Canal | 325 | Woodbury | 42 13 18 N | 096 13 45 W |
| Boyer Family Cemetery | Cemetery | 229 | Van Buren | 40 50 00 N | 092 06 41 W |
| Boyer Hollow | Valley | | Mills | 41 04 08 N | 095 48 26 W |
| Boyer Post Office (historical) | Post Office | 377 | Crawford | 42 10 55 N | 095 14 07 W |
| Boyer Post Office (historical) | Post Office | 312 | Pottawattamie | 41 26 00 N | 095 51 51 W |
| Boyer River | Populated Place | 369 | Crawford | 42 11 21 N | 095 12 17 W |
| Boyer River | Stream | | Pottawattamie | 41 27 11 N | 095 55 09 W |
| Boyer Valley Community School | School | 351 | Harrison | 41 51 14 N | 095 35 40 W |
| Boyer Valley Community Schools | School | 350 | Crawford | 41 55 37 N | 095 29 33 W |
| Boyhood Home of Emerson Hough Historical Marker | Park | 289 | Jasper | 41 42 15 N | 093 02 44 W |
| Boylan Cemetery | Cemetery | 333 | Hardin | 42 19 56 N | 093 16 51 W |
| Boylan Creek | Stream | | Butler | 42 43 27 N | 092 55 36 W |
| Boylan Creek Wildlife Area | Park | 293 | Butler | 42 44 20 N | 092 55 11 W |
| Boylans Grove Post Office (historical) | Post Office | 317 | Butler | 42 47 12 N | 092 54 28 W |
| Boyleston Cemetery | Cemetery | 177 | Henry | 40 50 00 N | 091 29 51 W |
| Boyleston Post Office (historical) | Post Office | 210 | Henry | 40 49 37 N | 091 30 11 W |
| Boyson Park | Park | 237 | Linn | 42 02 15 N | 091 36 46 W |
| Bozzaris Post Office (historical) | Post Office | 313 | Ringgold | 40 30 31 N | 094 27 07 W |
| BR Miller Middle School | School | 281 | Marshall | 42 02 47 N | 092 55 52 W |
| Bracewell Post Office (historical) | Post Office | 323 | Decatur | 40 38 45 N | 093 38 16 W |
| Brackett Alumni Guest House | Building | 281 | Linn | 41 55 25 N | 091 25 18 W |
| Braddy Park | Park | 301 | Page | 40 34 44 N | 095 01 43 W |
| Braddyville | Populated Place | 300 | Page | 40 34 44 N | 095 01 48 W |
| Braddyville (historical) | Locale | 303 | Page | 40 34 42 N | 095 01 49 W |
| Braddyville Access | Locale | 285 | Page | 40 34 46 N | 095 01 21 W |
| Braddyville Cemetery | Cemetery | 306 | Page | 40 34 38 N | 095 02 19 W |
| Braddyville City Hall | Building | 303 | Page | 40 34 42 N | 095 01 49 W |
| Braddyville Post Office | Post Office | 303 | Page | 40 34 42 N | 095 01 49 W |
| Braden School | School | 301 | Lucas | 40 57 15 N | 093 17 18 W |
| Bradford | Locale | 383 | Franklin | 42 37 59 N | 093 14 42 W |