[header] How to address to a po box [title] Start the delivery address in the center of the envelope. [step] The name and address of the person or entity that the letter is intended for should go front and center. Putting these important pieces of information in plain sight will make the letter easier to sort and deliver. 
[substeps] If the delivery address is unclear or incorrectly placed, it's possible that the letter could be mishandled. [title] Write the recipient's first and last name on the first line.