---
type: faq
title: "What is the largest size postcard that can mail at USPS postcard rates and not letter rates?"
description: "Postcard postage rates are cheaper than letter rates, but only up to a certain size. Go bigger and the piece mails at the higher letter rate instead. The l"
resource: https://www.4over4.com/faqs/marketing-materials/what-is-the-largest-size-postcard-that-can-mail-at-usps-postcard-rates-and-not-letter-rates
tags: ["Marketing Materials", "faq"]
timestamp: 2026-07-20T18:54:40.856Z
---

# What is the largest size postcard that can mail at USPS postcard rates and not letter rates?

Postcard postage rates are cheaper than letter rates, but only up to a certain size. Go bigger and the piece mails at the higher letter rate instead. The l

Part of the **Marketing Materials** hub. See [all faq concepts](index.md).

- Page type: faq
- Hub: Marketing Materials
- URL: https://www.4over4.com/faqs/marketing-materials/what-is-the-largest-size-postcard-that-can-mail-at-usps-postcard-rates-and-not-letter-rates