The Santa Barbara Metropolitan Transit District (MTD) is a public transit agency providing bus service in the southern portion of Santa Barbara County, California. It serves the cities of Santa Barbara, Carpinteria, and Goleta as well as the unincorporated areas of Montecito, Summerland, and Isla Vista. In 2021, the system had a ridership of 3,222,100, or about 14,700 per weekday as of the second quarter of 2022.