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Postal Codes and Sizes

Standard Envelope Sizes

  • No. 6 1/4 = 3.5" x 6"
  • No. 6 3/4 = 3.625" x 6.5"
  • No. 7 = 3.75" x 6.75"
  • No. 7 3/4 = 3.875" x 7.5"
  • No. 8 5/8 = 3.625" x 8.625"
  • No. 9 = 3.875" x 8.875"
  • No. 10 = 4.125" x 9.5"
  • No. 11 = 4.5" x 10.375"
  • No. 12 = 4.75" x 11"
  • No. 14 = 5" x 11.5"

Address Area and Bar Code Clear Zone
for optical character recognition:

  1. Address must be at least 1/2" inch from either the right edge or the left edge of the envelope.
  2. An area 5/8" high from the bottom and 4 1/2" from the right edge must be left clear for Post Office Bar Coding.
  3. Complete address must be visible with a minimum of 1/8" clearance between both sides and bottom of window.
You only get one chance to make a good first impression.

Standard Window Size:
1 1/8" x 4 1/2" with 7/8" space to the left and 1/2" space to the bottom.

OCR Window Size:
1 1/8" x 4 1/2" with 7/8" space to the left and 5/8" space to the bottom.