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 » Business & Finance Mail & Shipping Postal Services

A standard postcard measures 6 inches wide by 4.125 inches high, which is the maximum size allowed by the United States Postal Service to qualify for first-class mail postcard rates. The USPS postcard minimum size is no ... More » Business & Finance Mail & Shipping

As of June 2014, the United States Postal Service states that the cost to send a standard sized postcard is 34 cents. At this rate, the postcard can be 6 inches long, 4 1/4 inches high and 0.16 inches thick. 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 »

Track certified mail from the U.S. Postal Service by using tracking tools on the USPS website. You need the tracking number for the package in order to use this service. Alternatively, send a text message to 28777 with y... More »