The entire County of Sonoma Special Address database was stripped of any reference to jurisdiction either municipal or postal zip code and was subsequently run through the AccuZIP USPS address verification application. As part of the verification process a zip code and city are added to the addresses that do not have that information. Address that may have duplicate addresses due to identical street names in multiple cities are excluded from this process. The information was then joined back to the special addresses and merged with the parcel base. The parcels were then dissolved using the city name and only using the unincorporated parcels. Additional work was then performed to clean up any anomalies and artifacts.

The entire County of Sonoma Special Address database was stripped of any reference to jurisdiction either municipal or postal zip code and was subsequently run through the AccuZIP USPS address verification application. As part of the verification process a zip code and city are added to the addresses that do not have that information. Address that may have duplicate addresses due to identical street names in multiple cities are excluded from this process. The information was then joined back to the special addresses and merged with the parcel base. The parcels were then dissolved using the city name and only using the unincorporated parcels. Additional work was then performed to clean up any anomalies and artifacts.