Mailbox Height

• The United States Postal Service requires that a curbside mailbox be anywhere from 41 to 45 inches off the ground, measured from the bottom of the box. This is so postal workers delivering mail by car don't need to get out to insert the mail into the mailbox.
  
  

Special Conditions

• If your curb or roadside has a special condition that prevents installing the mailbox at the required height, you should contact the USPS for help in moving the curbside mailbox to an appropriate place.
  
  

Support

• The USPS doesn't have a requirement on what you can use to support the mailbox after installation, but it recommends the support be of adequate strength and size. The only time the USPS would require a change is if the mailbox support poses a risk to the safety of the mail carrier, or impedes his ability to efficiently deliver the mail.
  
  

Other Points To Consider

• Some considerations are important, even though they don't relate to the mailbox height. The box should be set back 6 to 8 inches from the curb, measured by the front face of the curb or roadside to the mailbox door. The box should be installed on the right side of the road. If you use a mailbox with a lock, make sure the lock conforms to USPS standards and the slot is big enough to insert mail through. The name on your mailbox should be at least one inch high.
  
  

Newspaper Receptacles

• If you receive delivery of a newspaper by a private carrier, a receptacle for that newspaper can be installed to the post of the mailbox as long as the receptacle does not touch the mailbox, does not interfere with mail delivery, does not extend beyond the front of the mailbox and does not feature any advertising, except for the name of the newspaper.