Unemployment Rate in Marin County, CA was 4.00% in December of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in Marin County, CA reached a record high of 12.90 in April of 2020 and a record low of 1.50 in December of 1999. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Marin County, CA - last updated from the United States Federal Reserve on March of 2026.