The Castaic post office will be open Sunday to serve Santa Clarita Valley residents who need to get holiday packages mailed this weekend but can’t make it to the post office earlier, the U.S. Postal Service announced today. The Castaic post office will be among a handful in the Los Angeles and Orange counties areas to be open Sunday. Hours will be 10 a.m. to 4 p.m. Postal patrons can also …
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