Standard Postcard Size: A Complete Guide to Dimensions & Use

Postcards have been around for ages, offering a snapshot of history, a quick hello, or even a clever marketing pitch. They’re a tangible link to both the past and present. So, what size is a standard postcard anyway?

This article will break down the dimensions you’ll typically find, from “standard” to “continental” and even the oversized options.

A brief history of standard postcard sizes

Postcards weren’t always the size they are today. In fact, there was a time when there was no such thing as a “standard” postcard size.

The Universal Postal Union and standardization

In 1878, the Universal Postal Union stepped in and set a standard postcard size of 3 1/2 x 5 1/2 inches.

This standardization made a big difference in the world of postal services and international communication. With a standard size, postal workers could sort and deliver mail more efficiently.

Characteristics of early postcards

Early postcards often had simple designs and black-and-white images. The printing technique of choice was often halftone offset lithography.

Continental and oversize postcards

While the 3.5 x 5-inch postcard is considered standard, you’ll find other sizes in use today.

The rise of the Continental postcard

Sometime around 1970, the “Continental” postcard — measuring 4 x 6 inches — gained popularity. The slightly larger size gave designers more room for images and longer messages.

What’s an oversize postcard?

Any postcard that’s larger than the Continental size is considered oversize. A common example is the 5 x 7-inch postcard, which is often used for calendars or promotional mailings.

USPS regulations

The U.S. Postal Service has specific guidelines for postcards. To qualify for postcard mailing rates, the card can’t be larger than 4 1/4 x 6 inches.

To Conclude

Postcard sizes have evolved over the years, from the original standard size of 3 1/2 x 5 1/2 inches to the slightly larger continental size of 4 x 6 inches, and even larger oversized formats.

Regardless of their dimensions, postcards remain a cherished way to communicate and a fascinating window into the past.