Summary of Mail Size

The size of a mail piece affects the postage rate as well as the regulations regarding the design of the piece. The three most commonly used sizes are Postcard, Letter, and Flat sizes.  Below you will find a guide to determine the size your piece qualifies as, but please call one of our sales representatives so they can verify the correct size of the piece and ensure that your piece meets US Postal Service regulations and is being mailed at the most efficient and cost effective rate.