Every City Council in every city of Alameda County voted unanimously to support Measure BB and place it on the ballot November 4. In addition, both BART, AC Transit, LAVTA and Union City Transit support BB, as well as many community-based organizations working to improve transportation in Alameda County. Here a full list of supporters:
- AC Transit
- Alliance of Californians for Community Empowerment
- Alameda County Board of Supervisors
- Alameda City Council
- BART
- Berkeley City Council
- City of Dublin
- City of Newark
- Emeryville City Council
- Fremont City Council
- Genesis
- Greenbelt Alliance
- Hayward City Council
- Livermore City Council
- Oakland City Council
- Piedmont City Council
- Pleasanton City Council
- San Leandro City Council
- Union City Council
- League of Conservation Voters of the East Bay
- League of Women Voters of Alameda County
- Sierra Club San Francisco Bay Chapter
- TransForm
- Walk Oakland Bike Oakland
- United Seniors of Oakland
- Bay Area Council
- Alameda County Taxpayers Association