Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Brown Post Office (historical) | Post Office | 97 | Benton | 44 30 19 N | 123 21 44 W |
| Brownlee Post Office (historical) | Post Office | 690 | Baker | 44 48 42 N | 116 56 04 W |
| Brownsboro Post Office (historical) | Post Office | 438 | Jackson | 42 28 05 N | 122 42 36 W |
| Brownsmead Post Office (historical) | Post Office | 4 | Clatsop | 46 13 03 N | 123 32 26 W |
| Brownsville Post Office | Post Office | 109 | Linn | 44 23 36 N | 122 59 05 W |
| Browntown Post Office (historical) | Post Office | 572 | Josephine | 42 05 02 N | 123 31 02 W |
| Bruce Post Office (historical) | Post Office | 81 | Benton | 44 23 29 N | 123 17 29 W |
| Buchanan Post Office (historical) | Post Office | 1285 | Harney | 43 38 33 N | 118 37 43 W |
| Buckfork Post Office (historical) | Post Office | 301 | Douglas | 43 06 44 N | 123 08 49 W |
| Buell Post Office (historical) | Post Office | 120 | Polk | 45 00 58 N | 123 25 06 W |
| Buena Vista Post Office (historical) | Post Office | 72 | Polk | 44 46 10 N | 123 09 02 W |
| Buffalo Post Office (historical) | Post Office | 1314 | Lake | 43 14 25 N | 120 22 05 W |
| Bullards Post Office (historical) | Post Office | 7 | Coos | 43 08 59 N | 124 23 44 W |
| Bully Post Office (historical) | Post Office | 1106 | Malheur | 42 59 25 N | 117 44 19 W |
| Buncom Post Office (historical) | Post Office | 513 | Jackson | 42 10 26 N | 122 59 53 W |
| Bunker Hill Post Office (historical) | Post Office | 21 | Coos | 43 21 21 N | 124 12 17 W |
| Burkemont Post Office (historical) | Post Office | 1027 | Baker | 44 55 35 N | 117 34 01 W |
| Burleson Post Office (historical) | Post Office | 1317 | Lake | 43 11 48 N | 120 49 12 W |
| Burlington Post Office (historical) | Post Office | 79 | Linn | 44 26 49 N | 123 12 19 W |
| Burns Post Office | Post Office | 1266 | Harney | 43 35 11 N | 119 03 15 W |
| Burnt Ranch Post Office (historical) | Post Office | 454 | Wheeler | 44 44 16 N | 120 19 11 W |
| Burnt Woods Post Office (historical) | Post Office | 210 | Lincoln | 44 36 13 N | 123 37 22 W |
| Burnt Woods Post Office (historical) | Post Office | 181 | Washington | 45 40 29 N | 123 17 09 W |
| Burroughs Post Office (historical) | Post Office | 421 | Umatilla | 45 35 14 N | 118 53 14 W |
| Butler Post Office (historical) | Post Office | 100 | Polk | 45 03 59 N | 123 34 34 W |
| Butte Creek Post Office (historical) | Post Office | 98 | Clackamas | 45 03 54 N | 122 41 49 W |
| Butte Falls Post Office | Post Office | 772 | Jackson | 42 32 35 N | 122 33 56 W |
| Butte Post Office (historical) | Post Office | 1344 | Lake | 43 14 20 N | 119 59 39 W |
| Butteville Post Office (historical) | Post Office | 42 | Marion | 45 15 44 N | 122 50 25 W |
| Buxton Post Office | Post Office | 101 | Washington | 45 41 19 N | 123 11 27 W |