Post Offices and USPS-authorized retailers where postage stamps are sold in Castro Valley, CA.
All the locations below sell USPS postage stamps which can be used to mail First Class letters in the United States. We list both official post offices run by the United States Postal Service and retailers which have been authorized by USPS to sell postal products in Castro Valley.
Need to mail a letter? See Mailboxes and Post Offices in Castro Valley
Now you can print postage immediately using your home printer. Avoid trips to the Post Office. Print USPS postage online with Stamps.com. Get a 4 week trial if you Start Now.
You can buy USPS® Forever® stamps at any post office or USPS® authorized reseller. Forever® stamps can always be used to mail a standard one-ounce letter, regardless of the current postal rate. This makes them the perfect sheet of stamps to keep on hand if you only occasionally mail letters.
Yes, you can purchase stamps online and print them using your home printer at Stamps.com, all without having to go to the store.
The cheapest place to buy stamps is your local post office. A sheet or book of 20 stamps usually offers the best deal.