| 1499 | Bix Beiderbecke Memorial Society | |
| 2141 | Black Box Theater | |
| 1463 | Black Hawk Area Education Center | |
| 667 | Black Hawk College Foundation | |
| 1747 | Black Hawk Unit IRTA | |
| 1803 | Blue Devil Athletic Foundation | |
| 1919 | Blue Grass American Legion | |
| 32 | Boy Scouts of America | |
| 25 | Boys & Girls Club of the Mississippi Valley | |
| 868 | Braveheart Children's Advocacy Center | |
| 2261 | Bridgeway Home | |
| 1888 | Bridging the Gap - QC | |
| 2193 | Broadway Historic District Association | |
| 2143 | Buddy Bags Inc dba Princeton Buddy Bags | |
| 1645 | Bureau County United Way | |