There are some rules and regulations with regard to mailbox sizes, which are broken down into three different categories:
- Small TI (C1) Size — Approximately 5-6 inches wide and tall while being 18 1/2 inches long.
- Medium T2 (C2) Size — Approximately 6-7 inches wide and tall while being 19 inches long.
- Large T3 (C3) Size — Approximately 8 inches by 11 1/2 inches wide and tall while being 22 1/2 inches long.
The “T” stands for Traditional, while the “C” stands for Contemporary.
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