Welcome to Zoom In On Zoning, our web-based application designed for you and intended to empower you with zoning information. This application provides site-specific information, including allowable land uses and standards for development, Assessor’s Parcel Number (APN), parcel size, owner and address on file with the San Mateo County Assessor’s Office. Anyone can access our zoning information from the map-based interface by simply zooming in and clicking on a parcel, or typing an address or APN into the search bar.