Bank of Marin supports the wealthy enclave of Marin County, north of San Francisco. The bank operates more than 20 branches in the posh California counties of Marin, Sonoma, and Napa, as well as in San Francisco and Alameda counties. Targeting area residents and small to midsized businesses, the bank offers standard retail products as checking and savings accounts, CDs, credit cards, and loans. It also provides private banking and wealth management services to high net-worth clients. Commercial mortgages account for the largest portion of the company's loan portfolio, followed by business, construction, and home equity loans.