What are the dimensions for the Williamsburg square base? Kristie June 13, 2022 20:26 Updated Follow The Williamsburg square base is 6 x 6 x 35" Related articles Williamsburg Mailbox Series- Assembly Instructions What "material" is the standard and large size mailboxes made from? What address are returns shipped to? What are the dimensions of an Oak Bracket? What do I do if my mailbox is broken? Comments 0 comments Please sign in to leave a comment.