Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Bigler Chiropractic Clinic | Hospital | 361 | Fayette | 42 57 38 N | 091 48 21 W |
| Bigler's Grove Post Office (historical) | Post Office | 406 | Harrison | 41 44 20 N | 095 54 11 W |
| Biglers Grove | Locale | 359 | Harrison | 41 31 34 N | 095 46 31 W |
| Biglers Grove Cemetery | Cemetery | 409 | Harrison | 41 43 57 N | 095 46 46 W |
| Biitner Field | Park | 372 | Pocahontas | 42 44 20 N | 094 39 51 W |
| Bill Buxton Stadium | Park | 291 | Warren | 41 21 50 N | 093 33 56 W |
| Bill Olson Livestock-Grain Incorporated Elevator | Locale | 375 | Hancock | 43 10 12 N | 093 32 51 W |
| Billups Branch | Stream | | Van Buren | 40 34 21 N | 092 08 46 W |
| Bily Clocks Museum | Building | 326 | Winneshiek | 43 12 18 N | 091 57 04 W |
| Bingham | Populated Place | 335 | Page | 40 44 03 N | 095 17 20 W |
| Bingham (historical) | Locale | 326 | Page | 40 44 06 N | 095 17 16 W |
| Bingham Park | Park | 312 | Lucas | 41 01 30 N | 093 18 59 W |
| Bingham Park | Park | 358 | Wright | 42 43 39 N | 093 33 52 W |
| Bingham Post Office (historical) | Post Office | 335 | Page | 40 44 03 N | 095 17 20 W |
| Bingham Township Cemetery | Cemetery | 381 | Hancock | 43 12 48 N | 093 54 48 W |
| Binns Post Office (historical) | Post Office | 346 | Page | 40 54 00 N | 095 12 31 W |
| Binz Hall | Building | 236 | Dubuque | 42 30 19 N | 090 40 32 W |
| Biological Sciences Library | Building | 210 | Johnson | 41 39 43 N | 091 31 60 W |
| Biology Building | Building | 209 | Johnson | 41 39 41 N | 091 31 60 W |
| Biology Building East | Building | 208 | Johnson | 41 39 42 N | 091 31 56 W |
| Biology Research Complex | Building | 274 | Black Hawk | 42 30 48 N | 092 27 21 W |
| Birch Creek | Stream | | Lee | 40 34 11 N | 091 33 46 W |
| Birch Creek | Stream | | Washington | 41 29 59 N | 091 50 21 W |
| Birch Hall | Building | 283 | Story | 42 01 25 N | 093 38 31 W |
| Birchwood Estates | Populated Place | 408 | Clay | 43 09 38 N | 095 08 36 W |
| Bird Creek | Stream | | Madison | 41 12 12 N | 093 56 19 W |
| Birdland Park | Park | 240 | Polk | 41 36 39 N | 093 36 46 W |
| Birdsal Family Plot | Cemetery | 372 | Worth | 43 24 30 N | 093 05 31 W |
| Birge Lake (historical) | Lake | 385 | Emmet | 43 29 01 N | 094 40 48 W |
| Birge Lake State Game Management Area | Park | 383 | Emmet | 43 28 60 N | 094 40 41 W |
| Birmingham | Populated Place | 229 | Van Buren | 40 52 44 N | 091 56 50 W |
| Birmingham (historical) | Locale | 229 | Van Buren | 40 52 44 N | 091 56 50 W |
| Birmingham Fire Station | Building | 229 | Van Buren | 40 52 44 N | 091 56 50 W |
| Birmingham First Presbyterian Church | Church | 229 | Van Buren | 40 52 44 N | 091 56 50 W |
| Birmingham Free Methodist Church | Church | 228 | Van Buren | 40 52 41 N | 091 57 23 W |
| Birmingham Library | Building | 229 | Van Buren | 40 52 40 N | 091 56 44 W |
| Birmingham Post Office | Post Office | 229 | Van Buren | 40 52 44 N | 091 56 50 W |
| Birmingham Town Hall | Building | 229 | Van Buren | 40 52 40 N | 091 56 44 W |
| Birmington Medical Clinic | Hospital | 229 | Van Buren | 40 52 44 N | 091 56 50 W |
| Birthplace of Mamie D Eisenhower Historical Marker | Park | 344 | Boone | 42 03 47 N | 093 53 07 W |
| Bisbee Cemetery | Cemetery | 346 | Monona | 42 01 22 N | 095 56 01 W |
| Bishop Cemetery | Cemetery | 368 | Calhoun | 42 13 20 N | 094 38 31 W |
| Bishop Cemetery | Cemetery | 257 | Iowa | 41 49 06 N | 092 01 30 W |
| Bishop Drumm Care Center | Hospital | 253 | Polk | 41 39 59 N | 093 42 11 W |
| Bishop Garrigan High School | School | 363 | Kossuth | 43 04 49 N | 094 12 48 W |
| Bishop Grove Cemetery | Cemetery | 293 | Benton | 42 05 12 N | 092 10 57 W |
| Bishop Hellan Catholic High School | School | 349 | Woodbury | 42 30 05 N | 096 24 26 W |
| Bishop Mueller Baseball/Softball Complex | Park | 348 | Woodbury | 42 31 29 N | 096 25 36 W |
| Bismark Post Office (historical) | Post Office | 291 | Clayton | 42 59 48 N | 091 21 29 W |
| Bismark Station | Locale | 291 | Clayton | 42 59 48 N | 091 21 29 W |
| Bitter Creek | Stream | | Ida | 42 31 58 N | 095 44 58 W |
| Bivens Grove | Locale | 302 | Marshall | 42 09 04 N | 093 09 31 W |
| Bixby State Park | Park | 300 | Clayton | 42 40 31 N | 091 23 59 W |
| Black Bird Bend | Bend | 317 | Monona | 42 03 56 N | 096 16 46 W |
| Black Bridge Spring | Spring | 196 | Dubuque | 42 39 40 N | 090 52 55 W |
| Black Cat Creek | Stream | | Kossuth | 43 06 51 N | 094 12 37 W |
| Black Cemetery | Cemetery | 268 | Warren | 41 26 22 N | 093 23 57 W |
| Black Corners | Populated Place | 311 | Dallas | 41 41 18 N | 094 01 24 W |
| Black Cultural Center | Building | 294 | Polk | 41 35 57 N | 093 39 13 W |
| Black Engineering Building | Building | 292 | Story | 42 01 34 N | 093 39 03 W |
| Black Falls | Falls | 327 | Winneshiek | 43 25 04 N | 092 00 47 W |
| Black Hawk | Populated Place | 185 | Scott | 41 31 15 N | 090 38 16 W |
| Black Hawk Bridge | Bridge | 189 | Allamakee | 43 21 55 N | 091 12 50 W |
| Black Hawk County | Civil | 257 | Black Hawk | 42 28 00 N | 092 19 01 W |
| Black Hawk County Country View Center | Hospital | 275 | Black Hawk | 42 34 16 N | 092 21 59 W |
| Black Hawk County Courthouse | Building | 257 | Black Hawk | 42 29 55 N | 092 19 59 W |
| Black Hawk County Park | Park | 248 | Black Hawk | 42 24 52 N | 092 13 01 W |
| Black Hawk Creek | Stream | | Black Hawk | 42 30 21 N | 092 21 30 W |
| Black Hawk Creek | Stream | | Jackson | 42 09 10 N | 090 52 44 W |
| Black Hawk Creek | Stream | | Scott | 41 30 03 N | 090 36 57 W |
| Black Hawk Creek Greenbelt | Park | 265 | Black Hawk | 42 25 02 N | 092 27 01 W |
| Black Hawk Creek Wildlife Center | Park | 301 | Grundy | 42 21 20 N | 092 40 29 W |
| Black Hawk Junior High School | School | 224 | Scott | 41 36 00 N | 090 23 32 W |
| Black Hawk Lake | Reservoir | 373 | Sac | 42 18 01 N | 095 00 22 W |
| Black Hawk Lake Wildlife Management Area | Park | 383 | Sac | 42 17 42 N | 095 03 01 W |
| Black Hawk Life Care Center | Hospital | 383 | Sac | 42 18 24 N | 095 03 12 W |
| Black Hawk Marsh | Swamp | 375 | Sac | 42 16 03 N | 095 02 51 W |
| Black Hawk Marsh State Game Management Area | Park | 375 | Sac | 42 16 04 N | 095 02 49 W |
| Black Hawk Park | Park | 262 | Black Hawk | 42 33 52 N | 092 29 03 W |
| Black Hawk River Access | Locale | 198 | Wapello | 41 01 45 N | 092 25 43 W |
| Black Hawk School | School | 267 | Black Hawk | 42 29 44 N | 092 23 16 W |
| Black Hawk School | School | 212 | Des Moines | 40 46 38 N | 091 06 44 W |
| Black Hawk Sheriffs Office | Building | 257 | Black Hawk | 42 29 50 N | 092 19 59 W |
| Black Hawk Springs Historical Marker | Park | 209 | Des Moines | 40 46 35 N | 091 06 06 W |
| Black Hawk State Park | Park | 374 | Sac | 42 17 37 N | 095 01 25 W |
| Black Hawk Wildlife Area | Park | 209 | Jackson | 42 05 00 N | 090 44 00 W |
| Black Hawk's Grave Historical Marker | Park | 205 | Van Buren | 40 53 10 N | 092 09 47 W |
| Black Oak Cemetery | Cemetery | 259 | Mahaska | 41 23 32 N | 092 51 16 W |
| Black Oak Creek | Stream | | Mahaska | 41 24 28 N | 092 47 56 W |
| Black Oak Hollow | Park | 345 | Winneshiek | 43 27 45 N | 092 01 36 W |
| Black Walnut | Locale | 387 | Palo Alto | 43 10 27 N | 094 43 14 W |
| Black Walnut Post Office (historical) | Post Office | 387 | Palo Alto | 43 10 27 N | 094 43 14 W |
| Blackbird/Ivy Island Wildlife Area | Park | 319 | Monona | 42 04 20 N | 096 16 21 W |
| Blackeville Post Office (historical) | Post Office | 302 | Black Hawk | 42 34 58 N | 092 13 15 W |
| Blackford Park | Park | 354 | Kossuth | 43 03 58 N | 094 14 51 W |
| Blackhawk | Populated Place | 240 | Davis | 40 49 56 N | 092 35 27 W |
| Blackhawk Bottoms | Park | 159 | Des Moines | 40 44 00 N | 091 08 16 W |
| Blackhawk Bottoms Public Hunting Area | Area | 237 | Des Moines | 41 44 04 N | 091 07 19 W |
| Blackhawk Hall | Building | 278 | Black Hawk | 42 25 47 N | 092 19 41 W |
| Blackhawk Island | Island | 161 | Louisa | 41 06 00 N | 090 57 36 W |
| Blackhawk Point Wildlife Management Area | Park | 260 | Allamakee | 43 27 50 N | 091 17 50 W |
| Blackhawk Post Office (historical) | Post Office | 240 | Davis | 40 49 56 N | 092 35 27 W |
| Blackhawk School | School | 205 | Wapello | 41 01 24 N | 092 27 07 W |
| Blackjar Lutheran Cemetery | Cemetery | 372 | Kossuth | 43 16 45 N | 094 24 15 W |
| Blackjer Church | Church | 372 | Kossuth | 43 16 43 N | 094 24 15 W |
| Blackledge Cemetery | Cemetery | 220 | Van Buren | 40 36 34 N | 091 53 43 W |
| Blackmore Cemetery | Cemetery | 213 | Van Buren | 40 45 30 N | 091 49 31 W |
| Blackmore Post Office (historical) | Post Office | 351 | Ringgold | 40 47 30 N | 094 06 01 W |
| Blacksmith Cemetery | Cemetery | 208 | Lee | 40 42 28 N | 091 30 36 W |
| Blackwood Island | Island | 256 | Black Hawk | 42 30 60 N | 092 22 44 W |