Abstract: A mailbox holder (10) includes an upper mailbox support (14), a lower ground support (16) that is securely fastened to the upper support, and an attachment bracket (36) to which a mailbox (12) is secured. The upper mailbox support includes a vertical post (20), a horizontal arm (22) rigidly welded to the post to carry the mailbox, a diagonal support (24) welded between the horizontal arm and the vertical post, and a circular bolt flange (26) welded to the bottom of the post. The lower ground support includes a vertical stake (28) adapted for direct insertion into the ground, a circular bolt flange (30) welded to the top of the stake for connection to the upper support flange, and radially outwardly extending stabilizers (32) to resist movement of the support in the ground. The bracket is adjustable in width to accommodate mailboxes of different widths.