Marin Transit is a public bus agency serving Marin County, California, in the North Bay region of the San Francisco Bay Area. Marin Transit provides local and rural fixed-route bus services, paratransit services, and school bus services in Marin County, funded by local, state, and federal funds.

Marin Transit was founded in 1964 as the Marin County Transit District, which continues as the agency's legal name. Marin Transit coordinates the planning, scheduling, and marketing for its services, which are operated by four independent operators under the Marin Transit brand. In 2025, the system had a ridership of 3,194,600, or about 9,900 per weekday as of the fourth quarter of 2025.

Marin Transit was formed by a vote of the people of Marin County in 1964 and was given the responsibility for providing local transit service within Marin County. It has since played a key role in providing local transit service within the county through various funding sources (Measure A Funds, State Transportation Development Act Funds, fares, property taxes and Federal Section 5311 rural transit funds).

Marin Transit serves all major cities, towns, and communities within Marin County except Muir Beach, Nicasio, and Peacock Gap (East San Rafael). Route information listed below is current as of April 12, 2026.

See Golden Gate Transit for information on Regional and Commute bus routes serving Marin County, which have no affiliation with Marin Transit.

Note: Italicized locations are served on select trips only.

Supplemental routes operate on school days only.

In addition to fixed route services, Marin Transit provides intra- and inter-county complimentary ADA paratransit (Marin Access) service.