On a letter-size piece, the recommended address placement is within the optical character reader (OCR) read area, which is a space on the address side of the mailpiece defined by these boundaries (see Exhibit 2.1, OCR Read Area):
a. Left: 1/2Â inch from the left edge of the piece.
b. Right: 1/2Â inch from the right edge of the piece.
c. Top: 2-3/4Â inches from the bottom edge of the piece.
d. Bottom: 5/8Â inch from the bottom edge of the piece.
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Return Address
AÂ domestic return address must be placed in the upper left corner of the address side of the mailpiece or the upper left corner of the addressing area. If the return address is a multiple delivery address, it must show a unit designator (e.g., an apartment number).