Sending a letter from Hong Kong to the United States costs only US$0.10 more than sending a letter within the United States. The United States Postal Service (USPS) has provided postal services to Hong Kong since 1845. The US Postal Service opened a branch in Hong Kong in 1869. Since then, the USPS has offered postal services to Hong Kong.The United States Postal Service (USPS) provides a number of postal services to Hong Kong, including airmail, surface mail, and registered mail. Surface mail is the slowest and most expensive option, whereas airmail is the fastest and least expensive. Registered mail is a more secure method of shipping sensitive documents or items.The US Postal Service provides a number of savings for shipping mail to Hong Kong. For example, the US Postal Service provides a discount for sending letters via airmail. The USPS also provides savings for bulk mailings as well as mailings delivered by registered mail.The USPS provides a number of options to help you send mail to Hong Kong. For example, the USPS provides an online service that allows customers to trace their mailings. The USPS now provides an online tool for clients to pay for postage.Customers who are sending mail to Hong Kong can use a range of resources provided by the US Postal Service. The USPS website contains a number of useful tools, such as Frequently Asked Questions, a Glossary of Terms, and a list of Helpful Hints. The USPS also has a number of books available, including the International Mail Manual, which has thorough information about sending mail to Hong Kong.