Bank of Marin Bancorp is a United States-based bank holding company. It conducts business through its wholly-owned subsidiary. The Bank provides a wide range of financial services to customers such as professionals, small and middle-marketbusinesses, and individuals residing in Marin, Sonoma, Napa, San Francisco, Alameda, Contra Costa, San Mateo counties, and others. The majority of its revenue comes from interest income.