How Postcard Size Affects Printing & Mailing Costs
Choosing the right postcard size is one of the most important decisions in a direct mail campaign. Size directly influences material usage, production efficiency, and USPS mailing classification.
USPS Postcard Size Requirements
To qualify for USPS postcard classification, mailpieces must fall within specific dimensional ranges. Classification affects how the piece is processed, not guaranteed postage pricing.
Minimum postcard size:
• At least 3.5 inches high by 5 inches long
Maximum postcard size (postcard rate eligibility):
• Up to 6 inches high by 9 inches long
How Common Postcard Sizes Affect Cost
4 x 6 Postcards
This size uses the least material and allows for maximum press efficiency. Standard 4 × 6 postcards are eligible for USPS First-Class Mail postcard rates, making them a common choice for time-sensitive and high-volume campaigns.
Common use cases:
• High-volume mailings
• Budget-conscious campaigns
• Appointment reminders and simple promotions
5.5 x 8.5 Postcards
This mid-sized format provides additional design space while remaining efficient to produce and mail. It is widely used for campaigns that balance visibility with operational efficiency.
Common use cases:
• Real estate marketing
• Retail promotions
• Multi-offer layouts
6 x 9 Postcards
The 6 × 9 format maximizes mailbox presence and design flexibility. While it meets USPS postcard dimensional limits, it is often processed at the USPS Letter rate depending on aspect ratio, thickness, and weight.
Common use cases:
• Premium marketing campaigns
• Brand-forward or image-heavy designs
• High-value offers and B2B outreach
Additional Factors That Influence Cost
While size plays a major role, overall postcard pricing is also influenced by:
Paper stock and thickness
Coatings and finishing options
Variable data and addressing services
Mailing method and USPS preparation requirements
Frequently Asked Questions
What postcard size is most commonly used?
Mid-sized formats such as 5.5 x 8.5 are commonly selected because they balance design space, mailing compatibility, and production efficiency.
Do larger postcards perform better?
Larger postcards often attract more attention, but performance depends more on targeting, messaging, and design quality than size alone.
Request a Custom Quote
Every project is different. Share your postcard size, quantity, paper, and mailing details, and our team will provide a tailored production and mailing estimate.