Question
What's the best postcard size for a direct mail marketing campaign?
Answer
Match the size to the goal rather than defaulting to the biggest option. For most campaigns, 4 by 6 inches gives the best balance of cost and impact because it earns the lowest postcard rate while still holding a clear message and call to action. Step up to a larger format when the offer needs more visual space.
| Size | Postage | Best for |
|---|---|---|
| 4 x 6 in | Postcard rate | High-volume, budget-first sends |
| 5.5 x 8.5 in | Letter rate | Coupons and detailed offers |
| 6 x 9 in | Letter rate | Property photos, event details, standout reach |
| 6 x 11 in | Letter rate | Maximum mailbox visibility and response |
- Pick 4 by 6 when postage efficiency matters most.
- Go larger when the extra visibility is likely to lift response. Oversized cards such as 6 by 9 and 6 by 11 consistently outperform standard 4 by 6 on response, and the lift usually more than covers the higher postage.
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