There are 9 United States Postal Service post boxes available to the public in Castro Valley, 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 Castro Valley, CA.

Public Collection Box
21966 Dolores St
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Public Collection Box
2688 Grove Way
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Public Collection Box
3301 Norbridge Ave
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Public Collection Box
20980 Redwood Rd
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Public Collection Box
3667 Castro Valley Blvd
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Public Collection Box
20283 Santa Maria Ave
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Public Collection Box
3067 Castro Valley Blvd
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Public Collection Box
4061 E Castro Valley Blvd
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Public Collection Box
6811 Villareal Dr
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