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Mailbox Installation Guidelines from the United
States Post Office
Whenever possible, boxes must be located so that carrier's vehicle is off pavement when serving them.
Box number must be painted on box in numerals not less than one inch high.
Post must be neat and of adequate strength and size.
Approach to box should be a hard level surface (gravel, cinders, stone).
Boxes must be placed to conform with state laws and highway regulations.
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Suggested installation of a single box.
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Suggested installation where snow removal is a problem.
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Extend box beyond end of post. Attach board holding box to post
with screws or double head nails, permitting easy removal if necessary
to adjust box height, 8 inch from curb , 18" minimum to post , 48" to
bottom of box.
- On paved roads, the roadside face of the box must be offset the width of
the shoulder plus 8 inches.
- On curbed streets, the roadside face of the box must be 8 inches from the
face of the curb.
- On gravel roads, the roadside face of the box must be 2 feet from the edge
of the graveled portion of the roadway.
- When a mailbox is installed in the vicinity of a guardrail, the box should
be placed behind the guardrail when possible with the face of the box even
with the back of the rail.
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