Popularity:#6 of 7 Post Offices in Sutter County#1,439 of 1,645 Post Offices in California#25,818 in Post Offices
Address, Phone Number, and Hours for Rio Oso Post Office, a Post Office, at Rio Oso Road, Rio Oso CA.
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The Rio Oso Post Office, located in Rio Oso, CA, is a branch location of the United States Postal Service (USPS) that serves the Rio Oso community. The customer service postal facility offers mail and package delivery services, P.O. box services, and passport services. The USPS operates as an independent agency within the federal government, supported entirely by revenues generated through its operations.You may contact the Post Office for questions about: