Postcard Sizes Explained: Are Postcards 4x6, 5x7, or Something Else? (2026 Guide)

When deciding between postcard sizes, the most common options are 4x6 and 5x7. Typically, 4x6 postcards are the standard size used for mailing and they are often more economical compared to 5x7 cards. Understanding the differences can help you make the best choice for your marketing needs.

Planning an EDDM saturation mailing instead? EDDM has its own dimensional rules. See the EDDM postcard size guide.

Choosing the right size is crucial for the effectiveness of your campaign. While 5x7 postcards offer a bit more space for design and information, they may come at a higher cost. See our full breakdown of postcard mailing costs by size to compare 4x6 versus 5x7 pricing side by side. Mail Processing Associates prints and mails both sizes in-house from one Lakeland, Florida facility on our Xerox Iridesse and Versant presses, so the size you pick is priced against the exact postage tier it falls into, not a generic sheet rate.

The 4x6 stays inside the USPS postcard rate; the 5x7 crosses into the letter rate. Our team sizes the piece to the offer and the tier before anything prints, so you are not paying letter postage on a card that only needed postcard space.

What Is the Standard Postcard Size?

The standard postcard size is 4 x 6 inches - the most common format in direct mail and the only size that comfortably qualifies for the lower USPS First-Class Mail postcard rate. The USPS postcard rate applies to cards from 3.5 x 5 inches (the minimum) up to 4.25 x 6 inches (the maximum). Other common sizes are 5 x 7, 6 x 9, and 6 x 11 inches; these are larger than the postcard-rate limit, so USPS treats them as letters or oversized pieces and they mail at higher rates. For EDDM saturation mailings, the standard formats are 6.25 x 9 and 6.25 x 11 inches.

Standard Postcard Sizes: 4x6 vs 5x7 vs 6x11 (and Postage Implications)

When considering postcard dimensions, it's essential to know the most common sizes and the specifics that distinguish them. This knowledge can help you choose the right format for your mailing and marketing needs.

Standard Postcard Sizes

The most widely used sizes for postcards are 4 x 6 inches and 5 x 7 inches. Both formats are perfect for various marketing campaigns and personal messages.

Other standard postcard sizes include:

• 3.5 x 5 inches
• 4.25 x 5.5 inches
• 6 x 11 inches

These sizes are considered mailable and comply with postal requirements. The 4 x 6 postcard is often favored for its compactness and cost-effectiveness, making it ideal for mass distribution.

4 x 6 vs. 5 x 7 Postcards

Choosing between the 4 x 6 and 5 x 7 postcards depends largely on your content and design preferences.

The 4 x 6 postcard offers a smaller canvas, which can be beneficial for simple messages or when you want to keep costs down. Meanwhile, the 5 x 7 postcard provides more space for images and text, making it suitable for more detailed content or eye-catching designs.

Consider your target audience and message clarity when selecting a size. Mail Processing Associates prints, addresses, and inducts both sizes under one roof in Lakeland, Florida, with CASS-certified addressing and USPS BMEU permit induction on every mailing, so the file that leaves design is the file that hits the postal stream.

How Big Are Postcards? USPS Dimensions and Size Limits

Postcards come in a defined range of sizes set by the USPS. The smallest size that qualifies for the First-Class Mail postcard rate is 3.5 inches by 5 inches; the largest postcard at that rate is 4.25 inches by 6 inches. Anything larger pays the First-Class letter rate, where FCM Presort Letter Mixed pricing is $0.672 per piece for the business presort tier, per USPS Notice 123.

In direct mail marketing, "postcard" gets used more loosely than the USPS definition. Marketers regularly send 5x7 and 6x9 cards as postcards even though USPS classifies them as letters or oversized pieces. Here are the dimensions actually used in the field, with their USPS treatment:

• 3.5 x 5 inches: Minimum postcard size accepted by USPS. Rare in commercial mail because the design space is too small for a real offer.
• 4 x 6 inches: The single most common postcard size in direct mail. Cost-efficient and qualifies for the postcard rate.
• 5 x 7 inches: Bigger canvas for image-heavy design. USPS treats this as a letter, not a postcard.
• 6 x 9 inches: Common for real estate, automotive, and home services campaigns. Letter rate.
• 6.25 x 9 inches: MPA's standard EDDM size for saturation neighborhood drops.
• 6.25 x 11 inches: MPA's jumbo EDDM size, the largest standard EDDM format we run.
• 6.125 x 11.5 inches: The maximum dimensions before USPS reclassifies the piece as a flat, which pushes you into higher postage.

Mail Processing Associates has run direct mail for 35 years, serving businesses in all 50 states from a single Lakeland, Florida production facility. The right postcard size is rarely the biggest one. We size every job to the offer, the audience, and the postage tier so the campaign hits the math you need, with approximately 94% match rate on NCOA processing keeping deliverability high before a piece is ever printed. See the full postcard cost breakdown by size for side-by-side pricing.

Postcard Design and Printing Essentials

Creating an effective postcard involves understanding key design elements and printing techniques. Knowing about design tips, bleed, trim line, and costs will help you maximize the impact of your postcard.

Elements of Effective Postcard Design

Start with a clear message that captures your audience's attention. Use bold headlines and concise copy that convey your main point.

Incorporate high-quality images that are relevant to your message, ensuring they are not pixelated. It's essential to maintain a consistent color scheme that aligns with your brand identity.

Consider using a template to streamline your design process. Templates often include guidelines for optimal size and layout. Ensure you leave enough white space, allowing your message to breathe, making it visually accessible.

Understanding Bleed and Trim Line

Bleed refers to the area around your postcard's edges that extends beyond the trim line. This feature is critical in printing to avoid white edges after the trimming process.

Typically, a bleed of at least 1/8 inch is recommended. This allows for slight misalignments in cutting. Your design should extend into this bleed area to ensure color and images reach the very edge of your postcard.

Knowing the trim line is equally important. This is where your postcard will be cut, so all essential information must remain within this boundary to prevent accidental cutting of your text or images.

Printing Costs and Techniques

Printing costs for postcards can vary significantly based on several factors. These include quantity, size, paper quality, and printing techniques. Generally, larger print runs lower the cost per unit.

Digital printing is cost-effective for small batches while offset printing may be better for large orders. Discuss these options with a professional to determine what suits your needs best.

Mail Processing Associates runs digital postcards on Xerox Iridesse and Versant presses, so short and mid-length runs skip plate charges and still hold color across the job. Our team handles the file from print through addressing and USPS induction in the same building, which is where most of the per-piece cost and the schedule are actually decided.

Direct Mail Marketing with Postcards

Direct mail marketing using postcards offers an effective way to reach your audience. This strategy not only maximizes engagement but also provides measurable results for your business. Focusing on key tactics like Every Door Direct Mail (EDDM) and Variable Data Printing can significantly enhance your marketing efforts.

Leveraging EDDM for Marketing

Every Door Direct Mail (EDDM) allows you to target entire neighborhoods without the need to compile a mailing list. You can select specific postal routes and reach thousands of potential customers efficiently. This method helps you save on postage and streamline your marketing process.

Using EDDM, you can send promotional postcards that promote special offers or events. The simplicity of this approach means you can frequently update your messaging. EDDM aligns perfectly with your marketing goals by making sure your advertisements reach a broad audience at a lower cost.

Mail Processing Associates runs EDDM at 6.25 x 9 inches for saturation drops and 6.25 x 11 inches for the jumbo format, prepares the route paperwork, and inducts the mailing directly with USPS, so an EDDM postcard moves without you compiling or renting a list.

Benefits of Variable Data Printing

Variable Data Printing (VDP) allows you to personalize each postcard you send out. With VDP, you can customize text, images, and offers based on your recipient's demographics or past purchasing behavior. This personal touch keeps your message relevant and engaging.

Personalized postcards can lead to higher response rates. Studies show that tailored mail can significantly increase customer interaction compared to generic messages. By aligning your postcards with audience interests, you enhance the likelihood of conversions.

Mail Processing Associates runs VDP on its digital presses, merging names, offers, and images from your data file record by record in the same workflow that addresses and inducts the mailing. Because the data pass and the addressing pass happen on the same job, the variable content and the mailing list stay in sync from print to the post office.

Postage and Mailing Considerations

Postage and mailing considerations are vital when deciding on the size and format of your postcards. Understanding the differences between mailing options, potential cost savings, and strategies for effective marketing will help you make informed decisions that affect your budget and reach.

First-Class Mail vs. Standard Mail

First-Class Mail offers a quicker delivery time, generally within 1-3 days, which makes it the right lane for time-sensitive materials. Postcards can be sent at a First-Class rate starting at $0.53 for standard sizes like 4"x6".

On the other hand, Standard Mail (often known as Marketing Mail) is more cost-effective for bulk mailings but may take longer, typically up to 5-10 days. This option is well-suited for promotional postcards aimed at a larger audience, as you can achieve significant savings on postage costs by mailing in bulk. Choosing the right mailing service allows you to balance speed with budget efficiency.

Postage Discounts and Bulk Mailing

Utilizing postage discounts through bulk mailing can significantly reduce your costs. When you send postcards in batches, particularly with First-Class Mail or EDDM (Every Door Direct Mail), you can access lower rates. For instance, EDDM allows you to send postcards without needing a mailing list, making it a great option for local advertising campaigns.

You should also explore additional discounts such as non-profit rates or commingled mailing options, which combine mail from various clients to maximize discounts. Mail Processing Associates holds the USPS BMEU permit and presorts in-house, so the postage tier, the presort discount, and the drop are handled on one job rather than passed between vendors.

Navigating USPS Marketing Mail

USPS Marketing Mail offers a variety of options for sending promotional materials, including postcards. To qualify, the mail must meet certain size and weight standards. For example, postcards larger than 6"x11" may be subject to higher rates, changing how you plan your marketing efforts.

When using USPS Marketing Mail, your postcards must also have a minimum of 200 pieces to achieve lower rates. This bulk mailing can enhance your reach at a reduced cost. Mail Processing Associates runs CASS, NCOA, and DPV hygiene on the list before the drop and applies IMb tracking to every piece, so a Marketing Mail postcard qualifies for the automation rate and stays traceable through delivery.

Strategic Use of Postcards in Business

Postcards serve as a powerful tool in your marketing strategy. By leveraging effective messaging and targeted outreach, you can enhance engagement and drive desired actions.

Crafting a Strong Call to Action

A compelling postcard message hinges on a strong call to action (CTA). Your CTA should be clear, concise, and persuasive. Use action-oriented language that encourages recipients to take specific steps, such as "Visit our website for a special offer" or "Call us today for a free consultation."

Design elements like bold fonts or contrasting colors can help your CTA stand out. Ensure it’s placed prominently on the postcard, making it easy for the reader to find.

Incorporating urgency, like "limited time offer," can also boost response rates. With the right approach, your postcard can effectively guide potential customers towards the action you desire.

Segmenting Mailing Lists for Targeted Campaigns

Segmenting your mailing list is critical for maximizing the effectiveness of your postcard campaigns. Identify different demographics within your audience, such as age, location, or purchasing behavior. This allows you to tailor your postcards more effectively.

For instance, promotional offers can be customized based on previous purchasing patterns. You might send a special discount to loyal customers or a welcome message to new subscribers.

Using targeted messaging increases the likelihood that your postcards will resonate. Mail Processing Associates runs the data work behind that segmentation in-house, from list hygiene to variable-data merge, and is SOC 2 Type 2 certified and HIPAA compliant, so segmented and personalized files are handled under audited controls before they print.

Postcard Size FAQ

What is the standard postcard size?

The standard postcard size is 4 x 6 inches. It is the most common format in direct mail and the only size that comfortably qualifies for the lower USPS First-Class Mail postcard rate.

What postcard size qualifies for the USPS postcard rate?

The USPS postcard rate applies to cards from 3.5 x 5 inches (the minimum) up to 4.25 x 6 inches (the maximum). Anything larger than 4.25 x 6 inches pays the First-Class letter rate instead of the postcard rate.

What is the largest postcard you can mail?

The largest piece you can mail in a postcard format before USPS reclassifies it as a flat is 6.125 x 11.5 inches. Cards larger than 6 x 11 inches can be subject to higher rates, so size choice has a direct effect on postage.

What size is an EDDM postcard?

The standard EDDM postcard sizes are 6.25 x 9 inches for saturation neighborhood drops and 6.25 x 11 inches for the jumbo format. EDDM lets you reach entire postal routes without compiling a mailing list.

Should I use a 4 x 6 or 5 x 7 postcard?

Choose 4 x 6 inches to keep postage and printing costs down and qualify for the postcard rate. Choose 5 x 7 inches when you need more space for image-heavy design, keeping in mind that USPS treats 5 x 7 as a letter, not a postcard.