If you've recently installed a new mailbox or moved into a new home, you may be wondering where to put numbers on a mailbox. While it may seem like a small detail, the correct placement and style of your address numbers are important for both visibility and postal compliance.
In this guide, we’ll explain the USPS guidelines, the best placement strategies for both curbside and wall-mounted mailboxes, and some design tips to help your house numbers stand out clearly—day or night.
Why Mailbox Numbers Matter
The main function of mailbox numbers is to ensure accurate and efficient mail delivery. Mail carriers rely on these numbers every day to deliver mail to the correct home. Poorly placed or hard-to-read numbers can cause delays or misdelivery. In emergency situations, visible address numbers can also help first responders locate your home quickly.
So knowing exactly where to put numbers on a mailbox isn't just about aesthetics—it's about practicality and safety too.
USPS Guidelines for Mailbox Numbers
According to the United States Postal Service (USPS), house numbers must meet specific requirements:
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Visibility: Numbers must be clearly visible and legible from the street, ideally from both directions.
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Size: Numbers must be at least 1 inch tall.
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Contrast: Use contrasting colors to improve readability (e.g., black numbers on a white or silver mailbox).
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Positioning: Numbers should be placed on the flag side of the mailbox (typically the right side facing the street) or on both sides for added visibility.
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Street Number Only: No need to include the street name on the mailbox—just the numerical address.
Some homeowners associations (HOAs) or local governments may have additional regulations, so always double-check with your local code enforcement office.
Best Placement Options
The ideal placement for mailbox numbers depends on the type of mailbox you have.
If you’re upgrading your mailbox or replacing an old one, now is the perfect time to consider a more stylish and functional design. Our curated modern mailbox collection features sleek, weather-resistant models that combine durability with contemporary aesthetics—ideal for enhancing curb appeal while meeting USPS standards.
For Curbside Mailboxes (Post-Mounted)
These are the most common mailboxes for suburban homes. Here's where to apply your numbers:
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Both sides of the mailbox: Recommended for visibility from either direction of travel.
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Right side (flag side): If you only apply numbers to one side, this is preferred for consistency with USPS guidelines.
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Front door (optional): Numbers on the mailbox door are acceptable but less visible from a distance.
For Wall-Mounted Mailboxes
For urban or rural homes with wall-mounted mailboxes:
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Front face of the mailbox: Place numbers directly on the front, making sure they are large and high contrast.
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Adjacent wall: If the mailbox is small, consider mounting house numbers just above or beside it on the wall.
For Cluster Box Units (CBUs)
If you live in a community with shared mailboxes:
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You typically don’t need to add numbers to the CBU yourself. These units are managed and numbered by the postal service or property manager.
Choosing the Right Numbers
When deciding where to put numbers on a mailbox, also consider the material, font, and durability of the numbers themselves:
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Reflective vinyl decals are affordable and easy to apply.
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Metal numbers offer a sleek, long-lasting option for upscale mailboxes.
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Weatherproof adhesives ensure the numbers stay intact over time.
Choose a font that is simple and easy to read, avoiding overly stylized or cursive fonts.
Common Mistakes to Avoid
To ensure your mailbox is functional and compliant, avoid these common errors:
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Placing numbers too low on the post, where they may be obscured by grass or snow.
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Using colors that blend into the mailbox, like silver on gray.
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Mounting only on the non-flag side, which may face away from the street.
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Using small or thin fonts that are hard to read from a moving vehicle.
If your mailbox is frequently overlooked, it may be time to clean the surface, replace worn numbers, or switch to a brighter or larger style.
Enhancing Curb Appeal
Address numbers aren’t just about function—they’re also a design element. Use this as an opportunity to complement your home’s aesthetic. For example:
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Pair brushed steel numbers with a modern black mailbox.
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Choose ornate, cast-iron numbers for vintage or cottage-style homes.
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Use a backplate or name plaque to add elegance and better visibility.
No matter your style, make sure function comes first. The numbers must be visible from the street at any time of day or season.
Reflective and Illuminated Options
For rural roads or neighborhoods with low lighting, visibility at night is crucial. Consider:
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Reflective number stickers
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Solar-powered mailbox lights
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Illuminated address signs mounted near the mailbox
These enhancements can make a big difference for mail carriers, visitors, and emergency responders.
Frequently Asked Questions
Where should I put numbers on my mailbox for USPS compliance?
Place numbers on the flag side of a curbside mailbox, using digits at least 1 inch tall. For extra visibility, place them on both sides.
Can I put my house number on the mailbox post instead?
Yes, but this should complement—not replace—numbers on the mailbox itself. Be sure they are still clearly visible from the road.
Are there rules for font or color?
USPS doesn’t regulate font style, but they do require that numbers are legible and high contrast. Stick with block fonts and avoid stylized typefaces.
Do I need to include the street name?
No. The numerical address is sufficient. Including the street name is unnecessary and could make the numbers harder to read.
What if my mailbox faces sideways to the road?
Place the numbers on both sides so that they can be seen from vehicles approaching from either direction.