 The district encompasses the inland Monterey Bay Area and other parts of the northern Central Coast, as well as the outer San Jose suburb of Morgan Hill.The district is centered on the major agricultural areas of the Pajaro Valley and the Salinas Valley.Monterey County – "57.5%"

All of San Benito County

Santa Clara County – "5.9%"

Santa Cruz County – "25.2%"
Due to redistricting, the 30th district has been moved around different parts of the state.