Established in 1998, U.S. Post company is a leading manufacturer of quality mailboxes, mailbox posts, street signs, and lighting. Street signs, mailboxes, yard lights. Our service and installation is second to none. In new developments, U.S. Post works with local postmasters to determine proper mailbox placement. Most mailboxes that are not properly installed will lean or sag within one or two years. Not a U.S. Post installed mailbox. No customer is too small or too large.