FAQ's for the new Larger Sized Postcard
The Postal Service has increased the size of a commercial presorted or automation First-Class Mail (FCM) postcard. The new maximum size fora postcard is 6 inches high by 9 inches long. The new extended dimension of the postcard piece will have a minimum thickness of .009 toa maximum of 0.016 and is eligible for the card size prices. NOTE: Any eligible postcard within the dimensions of both 4 ¼ inches high and 6 inches in length, the minimum thickness is still .007.