.USPS Customer Service Phone Number: If you are someone who is living in the United States then USPS doesn't to be introduced to you. As we all know USPS which stands for the United States Postal Service is one of the major postal departments in the country. Since USPS is a government-owned body hence it is liable for handling the entire region of the United States to deliver the postal packages and the mails throughout the country. We know that USPS is quite a big body of the postal department. Due to that, it is known as the United States post office. Hence it becomes imperative to the USPS to have a customer service department. It can handle and sort out all the queries of the customers related to their packages and the mails. The user can also check out here for USPS Sunday working and delivery hours by clicking this link. USPS Sunday Delivery Hours Well yes for the same concern USPS is having a separate unit in itself. That handles all the queries of the customers. Assists them with the queries or the issues that they are facing. USPS customer service all time available for their user. They love to assist their users who are facing the issues. USPS Customer Service Phone Number So, If you are someone who is living in the United States. If you have any kind of query related to your mail or the package. You will certainly need to connect with the USPS customer services department to get your query resolved. You can reach out to the USPS customer service department by calling at the 650-377-1334 number. The customers will be provided with full assistance. The assistance, regarding their emails or the packages booking or delivery status or any other kind of query related to USPS postal services.