Four sizes are available for EDDM postcards:   6.25” x 8”  6.5” x 9”  6.5” x 11”  8.5” x 11”  For postcards you’ll be sending through our mailing service, we offer the following sizes:  4.25” x 5.5”  4” x 6”  4.25” x 6”  5” x 7”  5.5” x 8.5”  6” x 9”  8.5” x 11”