The best postcard size depends on your message, budget, and mailing goals.

Popular postcard sizes include:

  • 4″ x 6″ – Budget-friendly and USPS mailing compliant
  • 5″ x 7″ – More space for graphics and messaging
  • 5.5″ x 8.5″ – Great for promotions and direct mail campaigns
  • 6″ x 9″ – High-impact marketing piece
  • 6″ x 11″ – Maximum size for standard postcard mailing rates

Larger postcards tend to attract more attention in the mailbox, while smaller sizes can reduce printing and postage costs.