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The Bay Region of PBMA consists of the following 12 California Counties:
| County |
Population |
| Alameda County |
1,673,133 |
| Contra Costa County |
1,161,643 |
| Marin County |
262,387 |
| Monterey County |
438,953 |
| Napa County |
138,795 |
| San Benito County |
63,329 |
| San Francisco County |
865,933 |
| San Mateo County |
762,488 |
| Santa Clara County |
1,932,022 |
| Santa Cruz County |
272,138 |
| Solano County |
451,432 |
| Sonoma County |
492,498 |
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