Single Mailbox Installation:

One mailbox is installed on a single support.

Double Mailbox Installation:

Two mailboxes are installed on a single support.

Multiple Mailbox Installation:

Three to five mailboxes are installed on a single support. A multiple mount is normally used if there are three or more mailboxes at a single location. Five mailboxes can be installed only if all of them are the small size.

Neighbor Delivery and Collection Box Units:

NDCBUs, or community mailboxes, are a type of mailbox installation that serves a large number of residents, such as at an apartment complex or mobile home park. TxDOT is not responsible for the installation and maintenance of NDCBUs. This type of mailbox is installed by the Post Office. If possible, these mailbox units should be installed on low volume intersecting roadways or on private property. If it is essential for a NDCBU to be located on the right-of-way, TxDOT must be contacted to designate an acceptable location.