List of US Post Office Stores in Clearlake Oaks, CA Outlet Note Regular Brands US Post Office California Clearlake Oaks Rating 4.5 based on 76 votes Official Website https://www.usps.com/ Products Postal Service NameAddressPhone Name/Address/Phone US Post Office outlet - Clearlake Oaks 13260 E Highway 20 (707) 998-3544 People Also Viewed