1. US Post Office

    1. US Post Office

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    Castro Valley, CA

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    US Post Office

    2.1 (135 reviews)
    Closed 9:00 am - 5:00 pm

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    4 years ago

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    7 years ago

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    12 years ago

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    11 years ago

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    11 years ago

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    7 years ago

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    14 years ago

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    8 years ago

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    8 years ago

    Why are we getting our mail past 6pm? Anyone? Please tell me? Will the USPS ever be saved? So many questions.

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    15 years ago

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    11 years ago

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    5 years ago

    No nonsense. They mailed what I needed and they were professional and courteous. Lines are long sometimes, but that's normal.

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    6 years ago

    Poor service. Always deliver mail during vacation hold. Very rarely answer phone when try to call.

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    10 years ago

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    12 years ago

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    8 years ago

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    6 years ago

    Best post office I've ever used. Line always goes very quickly, staff are friendly and helpful, and there is always a nice community vibe.

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    8 years ago

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    6 years ago

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    8 years ago

    Great service at this location. The staff members were polite, helpful, and informative even with a long line of customers.

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    10 years ago

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    9 years ago

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    8 years ago

    Doesnt even try to get into my apt complex to deliver the mail. You had one job...

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    13 years ago

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    12 years ago

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    15 years ago

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    17 years ago

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    Page 2 of 4

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    Review Highlights - US Post Office

    Imelda, the supervisor at Castro Valley Post Office quickly and efficiently helped me straighten everything out.

    Mentioned in 7 reviews

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    US Post Office

    US Post Office

    (112 reviews)

    There is always available parking here and I really like that lol…read moreCustomer service is friendly and helpful You can purchase cards and gift cards here There is a drive up drop off box and that is super convenient

    3 of 3 USPS similar reviews. This was my usual SL USPS, but…read moreI was not in the area and Googled the closest one to me at the time; what a fail. Quality/Quantity - Keep in mind I am grading on a curve... The low rating is due to the comparison with all the other Post Offices that I frequent... See other reviews; Reno (3 Stars) and Alameda (4 stars). The lobby is not open 24/7. I guess I am spoiled with my Alameda and Reno post offices. I made the mistake on the 1/20/25 (a holiday) of trying to drop off letters (5 inches worth; I know, due to my travels, I have not checked my mail for a long time) and a package in 3 SL post offices. Atmosphere - Decent size lobby. Homeless here, hence the closure during non business hours. Plenty of parking.. One way in and out. Well it is supposed to be... They have a very secure letter mail drop off, see picture. Too bad I was only able to put 1-2 letters at a time. And no place to drop off my package. Going to the Alameda USPS tomorrow. Service - 2, barely good enough. Barely even any self service... Price - N/A, see their websites. Owner Comment - Congrats on your success since 1971 (formed in Washington DC) with your $80B in revenue. Much controversy about your profitability or lack of it. This is an "independent" agency of the executive branch of our US government. You have an amazing history dating back to 1775, but I will not go into that here.

    US Post Office - Positive ProductiveDay  3.10.2023

    US Post Office

    (66 reviews)

    2 of 3 USPS similar reviews. This is not my usual SL USPS,…read morebut I was in the area and Googled the closest one to me at the time; what a fail. Why is there a USPS in the middle of a mall!?! Part of the reason I came was just to see if Google was wrong, lol. Quality/Quantity - Keep in mind I am grading on a curve... The low rating is due to the comparison with all the other Post Offices that I frequent... See other reviews; Reno (3 Stars) and Alameda (4 stars). The lobby is not open 24/7. I guess I am spoiled with my Alameda and Reno post offices. I made the mistake on the 1/20/25 (a holiday) of trying to drop off letters (5 inches worth; I know, due to my travels, I have not checked my mail for a long time) and a package in 3 SL post offices. Atmosphere - Decent size lobby, again too bad they were closed. Homeless here today, so I understand why they are closed during non business hours. The other SL USPS that I went to today had homeless people also. Plenty of mall parking, but so many bad drivers. Service - 2, barely good enough. Not even any self service... Price - N/A, see their websites. Owner Comment - Congrats on your success since 1971 (formed in Washington DC) with your $80B in revenue. Much controversy about your profitability or lack of it. This is an "independent" agency of the executive branch of our US government. You have an amazing history dating back to 1775, but I will not go into that here.

    Went in to mail a document and wanted to make sure I had proof it had been delivered…read more Maria helped me and was super patient and sent my mail out with exactly what I needed. Went in on a Monday at noon and there was no line!!

    US Post Office

    US Post Office

    (42 reviews)

    A small post office. They take a break for lunch time - which I don't think is the case with larger…read morepost offices. For whatever reason people drive the wrong direction in the parking lot regularly. Small post office. Usually only one person working here. I suppose you could complain its small or just be thankful that it exists in the first place. If you have a PO box here it is unavailable for access unless the whole place is open for business. I've seen other post offices where you could access your PO box for hours sightly longer. The whole post office is closed for lunch. This is something you only have to deal with because it is so small. During the Christmas holidays be sure and send out your mail early. Like I said - one man team and the line can get krazy. San Lorenzo might be a better option during the holidays.

    I don't want anyone to lose their job, but I see that everyone else is writing about the same…read moreclerk. My return package was lost a few years ago because he refused to give me a receipt. This time, he entered the wrong country. D: The package was sent out over a month ago, and my friend still hasn't received it yet. Luckily, I still had the receipt, checked it, and found that a different country was written on it. I usually go to a different post office, but their system was down that day, so I went to this one again. He's always on his phone and even told me to hold on to pick up a call. While I try to be patient and understand that it might have been an important call, judging by the other comments, I don't think so. Now, trying to recall the situation, I don't think he even asked me to verify the address. However, the package and the form I had to fill out were definitely correct because I had handwritten it. I called customer service, and they were super friendly. Unfortunately, all I can do now is wait for that country to send it back to me or eventually deliver it to the correct country.

    US Post Office - postoffices - Updated September 2026

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