Marin is a bicycle manufacturer in Marin County, California, established in 1986. It specializes in mountain bikes but also has other types. Many of its 68 bicycles are named after locations in and around Marin County.News & Updates. Marin Water increases fines for smoking, campfires and fireworks on watershed. News Release - Dec. 14, 2022. Read on... Pay-by-phone services no longer available to customers College of Marin men’s basketball team cruised to victory in their first conference game against Merritt College. Important.