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three sizes - No. 1, No. 2, or No. 3, measured by minimum interior dimensions. The largest acceptable curbside mailbox is the No. 3, which measures 22.81 inches long, 11 inches wide, and 15 inches in height (58 cm x 28 cm x 38 cm) at the peak. Locking mailbox designs that provide security for the recipient's incoming mail have fewer restrictions on shape and size, though designs with a slot for incoming mail must be at least 1.75 inches high by 10 inches wide. Residential locking mailboxes cannot require

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