Not to be confused with POST card or Postal card. Example of a court card, postmarked 1899, showing Robert Burns and his cottage and monument in Ayr. A postcard or post card is a rectangular piece of thick paper or thin cardboard intended for writing and mailing without an envelope. Shapes other than rectangular may also be used.
https://en.wikipedia.org/wiki/Postcard
ARTWORK NOT TO SCALE—All measurements are in inches. These are standard postcard sizes. Check with United States Post Office before mailing. Designers Toolbox is not responsible for errors. Opening the downloaded files. You will need the Free StuffIt Expander utility installed on your computer to open the .zip files.
http://designerstoolbox.com/designresources/postcards/6x425/
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.
https://www.reference.com/business-finance/average-size-postcard-b107e801cf680778
A: Rates will vary depending on the postcard size of your choice. For example, a 4” x 6” and 4.25” x 6” sized postcard can qualify for First Class Card rate. Meanwhile, 4.5” x 6” up to 6” x 11” postcards, whether flat or folded, qualify for either First Class Letter rate or Standard Bulk rate.
https://www.uprinting.com/standard-postcard-size.html
In 1899 a standard postcard size of 5.5 x 3.5 inches was introduced as the maximum size. The minimum size was 3.25 x 2.25 inches. The minimum size was raised to 4 x 2.75 inches in 1906 and in 1925 the maximum size was raised to 5.875 x 4.125 inches.
http://www.papersizes.org/postcard-sizes.htm
Standard postcard sizes. Standard postcard sizes. Below, we’ve listed several common postcard sizes. The size you end up with will depend on your budget and your message. Keep in mind that the smaller sizes offer more affordable postage, while the larger sizes are more likely to be noticed in a stack of mail.
https://www.visiondesign.com/standard-postcard-sizes/
Standard Postcard Size. Standard Postcard Size Information for Printing, Design & Mailing. Printing postcards is not just a matter of picking the right designs and paper. Size matter. Choosing the right postcard dimensions for your marketing strategies is important. Select wisely, because it could make or break your campaigns.
https://www.uprinting.com/standard-postcard-size.html
The U.S. Postal Service allows customers to use the postcard rate for First-Class Mail for postcards that are at least 3.5 inches high by 5 inches wide but no more than 4.25 inches wide by 6 inches wide. As of April 2014, the postage rate for a postcard of this size is 34 cents. USPS also has a First-Class rate for large postcards that are no more than 6.125 inches high by 11.5 inches wide by 0.25 inches thick. These postcards cost 49 cents to mail as of April 2014.
https://www.reference.com/business-finance/average-size-postcard-b107e801cf680778
International Standard Postcard Size. Although the general consensus is that the dimensions of an international standard postcard are A6 size, 148 x 105 mm or 5.8 x 4.1 inches. The Universal Postal Union (UPU) has defined postcards as having the following maximum and minimum sizes for their members.
http://www.papersizes.org/postcard-sizes.htm
Depending on the mail service you are using, the cost and requirements for a postcard vary. The USPS considers a postcard to be any single rectangular piece of paper that is at least 3 1/2 inches high by 5 inches long by 0.007 inch thick' and no more than 4-1/4 inches high by 6 inches long by 0.016 inches thick.. The post office considers all papers outside of these dimensions to be letters.
http://legalbeagle.com/7146126-size-postcard.html
dimensions of postcard
The average size of a standard postcard is 4 inches high by 6 inches wide. The average size of a standard postcard is 4 inches high by 6 inches wide