Marin County is one of the original 27 counties of California, created February 18, 1850, following adoption of the California Constitution of 1849 and just months before the state was admitted to the Union.
O Marin County é un dos 27 condados orixinais de California, creado o 18 de febreiro de 1850 tras a adopción da Constitución de California de 1849 e meses antes de que o estado fose admitido na Unión.