For mail sent through the U.S. Postal Service, postcards must be at least 3.5 inches high by 5 inches long by 0.007 inch thick and no bigger than 4.5 inches high by 6 inches long by 0.016 inches thick. The standard-size ... More »

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Most commercially-produced postcards measure approximately 4.21 inches by 5.47 inches. Less commonly, smaller postcards are typically 3.5 inches by 5.5 inches, close to the minimum size the USPS allows. More »

The average size of a standard postcard is 4 inches high by 6 inches wide. In the United States, a postcard of this size can be mailed under a special First-Class rate. More »

The differences in U.S. Postal Service shipping prices are due to the size of the package, the type of service the person is choosing and the distance to the mail's destination. The weight of the package also plays a rol... More »

The Global Forever stamp can be used to mail a postcard or 1-ounce letter-size letter anywhere in the world by First Class Mail International delivery, according to the U.S. Postal Service. In 2014, a Global Forever stam... More »

The average size of a standard postcard is 4 inches high by 6 inches wide. In the United States, a postcard of this size can be mailed under a special First-Class rate. More »

Put a vacation hold on mail using a designated form provided by the U.S. Postal Service. Forms can be filled out and filed online or in person at any post office branch. More »

www.reference.com Business & Finance Mail & Shipping Postal Services