Oceanside Post Office 3 years ago ID: #428482 Listed In : Government Offices 1895 Avenida Del Oro, Oceanside, CA 92056 760-806-3866 https://postofficeshours.com/ca/oceanside/oceanside/ [email protected] Business Description Oceanside Post Office in San Diego County, CA 92056. USPS Post office locations hours and phone numbers. Reviews & Ratings Write a Review No Review. Please login / register to add your review. Tags : oceanside ca post office oceanside post office