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4.25 inches x 5.5 inches, 4 inches x 6 inches, 5 inches x 7 inches, and 5.5 inches x 8.5 inches are all considered to be standard postcard sizes. Rack cards, 4 inches x 9 inches, are increasing in popularity as they can be mailed as postcards as well as fit in brochure racks. We also design for custom sizes, shapes, and folds.
