Reference and Education Subcategories
Subcategories for Reference and Education are listed below to provide more narrow searching within the Reference and Education category.
Your United States Post Office Wants You! To Know This Stuff
Without further ado, here is the skinny on postage rates and regulations on postcards: 4" x 6" or 4.25" x 6" postcards. These mail at a first class individual stamped rate of 27 cents each. The post office has a specific stamp for these postcards.