There are 6 United States Postal Service post boxes available to the public in Castroville, CA. You can use any one of these locations to mail your letter or small package. For additional collection boxes in neighboring communities, see the list of post boxes in California.

Are you looking for a post office? See the list of post offices in Castroville, CA.

Public Collection Box
11025 Commercial Pkwy
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Public Collection Box
11252 Merritt St
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Public Collection Box
10799 Merritt St
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Public Collection Box
8042 Moss Landing Rd
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CVS
17579 Vierra Canyon Rd
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Safeway
17539 Vierra Canyon Rd
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