Best Mailbox Locks of 2025

Harry Stack
Last Updated: Jan 16, 2025

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Mailbox locks are an essential component in keeping your mail safe and secure. These locks come in various shapes and sizes, designed to fit different types of mailboxes. They can be made of different materials such as brass, steel or plastic, and offer different levels of security. Some mailbox locks are designed to be picked with a key, while others require a combination or code to access the mailbox. Mailbox locks are easy to install and offer peace of mind knowing that your mail is protected from theft or tampering.

At a Glance: Our Top Picks

#TOP 1
Prime-Line S 4140 Mailbox Lock Replacement
ftb score rating icon 9.9
#TOP 2
Prime-Line Diecast 5-Pin National Keyway Mailbox Lock
ftb score rating icon 9.8
#TOP 3
Prime-Line Mail Box Lock
ftb score rating icon 9.6

Top 10 Mailbox Locks

#TOP 1

Prime-Line S 4140 Mailbox Lock Replacement

PRIME-LINE
S 4140
Nickel
1 Pack
Prime-Line S 4140 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – ILCO 1003M Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set)
ftb score rating icon 9.9
FTB Score

The Prime-Line S 4140 Mailbox Lock Replacement is a durable and strong lock made of diecast with a nickel-plated finish. It is a multipurpose replacement lock that works for several brands, including American Device, Auth-Florence, Bommer, and Miami Carey. The lock kit includes 5 zinc-plated steel cams, brass pins, a spring steel locking clip, and 2 keys. The lock has a security feature that prevents the key from being removed when in the unlocked position, ensuring the mailbox is locked every time it is used. This replacement lock is an easy fix for broken or lost mailbox locks.

What We Like
Easy installation
Multiple lock options
High quality
Great value
Improved security
What We Don't Like
Some locks may not fit
#TOP 2

Prime-Line Diecast 5-Pin National Keyway Mailbox Lock

PRIME-LINE
S 4573
Nickel
1 Pack
Prime-Line S 4573 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – NA-14 Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set)
ftb score rating icon 9.8
FTB Score

The Prime-Line Diecast 5-Pin National Keyway Mailbox Lock is a replacement lock for American, Florence, Miami-Carey, Bommer, and Auth mailboxes. It includes a 5-pin replacement lock, nine cams, and two keys, and is built to last with diecast, brass, steel, and stamped steel materials. The mailbox lock replacement can be easily installed with a few simple tools, and Prime-Line is a trusted brand for quality repair and replacement hardware products for your home.

What We Like
Fits standard mailboxes
Easy installation
Robust design
Key retention feature
Good value for price
What We Don't Like
Material feels somewhat weak
Lock orientation may differ
#TOP 3

Prime-Line Mail Box Lock

PRIME-LINE
MP4946
Nickel
5/8 in.
Prime-Line MP4946 Mailbox Lock, 1-9/16 In. Cam Reach, Diecast Construction, Nickel (Single Pack)
ftb score rating icon 9.6
FTB Score

The Prime-Line MP4946 Mail Box Lock is a replacement lock used to replace damaged or missing mailbox locks. It is easy to mount with a spring steel locking clip, rotates in a counter-clockwise direction to lock, and has a reach of cam of 1-9/16 inches. Made of diecast construction with brass pins and a nickel plated face, this lock is durable and eliminates the need to stock individual locks.

What We Like
Fits mailbox perfectly
Easy installation
High-quality replacement
Multiple fitting options
Affordable alternative to locksmith
What We Don't Like
Missing clip for tight fit
Requires old parts for installation
#TOP 4

Prime-Line MP4573 Mailbox Lock

PRIME-LINE
MP4573
Nickel
90 degree
Prime-Line MP4573 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – NA-14 Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set)
ftb score rating icon 9.5
FTB Score

The Prime-Line MP4573 Mailbox Lock is the perfect solution to replace your damaged or missing mailbox locks. This key lock is made of durable diecast material with a nickel-plated face and comes with 5 cams, brass pins, a spring steel locking clip, a threaded body, and a nut for optional attachment. The lock requires a 90-degree counter-clockwise rotation to unlock and can replace locks from American, Florence, Miami-Carey, Bommer, and Auth. It has a locking depth of 5/16 inches and a reach of 15/16 inches, offering secure locking for your mailbox.

What We Like
Easy installation
Multiple latch options
Effective replacement for broken lock
What We Don't Like
Key operation not very smooth
#TOP 5

Prime-Line MP4526 Mail Box Lock with Dust Cover

PRIME-LINE
MP4526
Nickel
1 Pack
Prime-Line MP4526 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – NA-14 Keyway, Opens Clockwise with 90º Rotation, Nickel Finish (1 Set)
ftb score rating icon 9.4
FTB Score

This mailbox lock is made of durable diecast material and features a nickel-plated face. With a spring clip installation and spring steel locking clip, it's easy to install and provides secure protection for your mailbox. The clockwise rotation ensures ease of use, and for added convenience, it includes a dust cover. Be sure to measure your door's backset, cross bore, and thickness to ensure the right fit.

What We Like
Easy installation
Smooth key operation
Comes with latches
Fits older models
Good value for price
What We Don't Like
Key difficulty initially
Only two keys included
#TOP 6

Prime-Line MP4048 Mail Box Lock

PRIME-LINE
MP4048
Brass
1/4 Inch
Prime-Line MP4048 Mail Box Lock, 1/4 In. Throw, Steel, Brass Plated (Single Pack)
ftb score rating icon 9.2
FTB Score

This mailbox lock by PRIME-LINE is made of sturdy steel with a brass plated finish. It can be used with mailboxes from Auth, United, and Florence, as well as old style apartment mailboxes. The lock has a 1/4 inch bolt throw and standard deadbolt application. Its key cylinder is offset 1/8 inch from center, and for further dimensional information, a line drawing is available. This lock provides secure access to your mailbox and is easy to install.

What We Like
Easy to install
Functioning locks
Affordable price
Available at local stores
What We Don't Like
Short lifespan
Inconsistent key compatibility
#TOP 7

Xinxinlin L-1172C C9100 Mailbox Lock

USPS-L-1172C
1 Pcs
1 Piece
L-1172C National Mailbox Lock Replacement C9100 - with 3 Keys, Replacement for USPS Mailbox Key Lock
ftb score rating icon 9.2
FTB Score

The Xinxinlin Mailbox Lock is a top-notch replacement for your USPS mailbox key lock. Enhance your security with its unique keying system, ensuring only you have access. Easily replace your old lock with this durable option that comes with three keys, giving you peace of mind and convenience. Crafted with quality materials, this lock is built to last, protecting your mail effectively. For any queries or issues, the Xinxinlin team is ready to assist within 24 hours.

What We Like
Easy installation
Includes 3 keys
Sturdy and secure
Affordable solution
Smooth key operation
What We Don't Like
Lock quality seems lesser
Missing latching mechanism
#TOP 8

VIXAVI Universal Mailbox Lock Set

Silver
Mailbox Lock Replacement - Universal Mailbox Locks with Keys - Easy to Install Mail Box Lock and Key Set - Durable and Secure Lock Replacement with 2 Keys for Almost All Locking Mail Boxes
ftb score rating icon 9.1
FTB Score

The VIXAVI Mailbox Lock offers an easy solution to enhance your mailbox security without needing to replace the entire unit. You can install this universal lock quickly and without any special tools, making it perfect for anyone, regardless of DIY skills. Built for durability, this lock resists rust and wear, ensuring it lasts for years. With its secure design, you can prevent unauthorized access to your mail, keeping your private documents safe. Enjoy the peace of mind that comes from knowing your mailbox is well-protected.

What We Like
Easy installation
Durable construction
Secure fit
Smooth locking mechanism
Good for replacement
What We Don't Like
Unusual key size for duplicates
Did not fit for some users
#TOP 9

Prime-Line MP4945 Mail Box Lock

PRIME-LINE
MP4945
Nickel
1 Count (Pack of 1)
Prime-Line MP4945 Mail Box Lock, 5-Cam, 5-Pin, 13/16 In. Threaded, Counter-Clockwise (Single Pack)
ftb score rating icon 8.9
FTB Score

The Prime-Line MP4945 Mail Box Lock is a high-quality mailbox lock designed to provide maximum security for your mailbox. Constructed from die-cast and featuring a nickel-plated face, this lock is built to last. The spring steel locking clip ensures that your mailbox will stay securely locked at all times. Additionally, the lock's multi-cam assortments can eliminate stocking of individual locks, making it a cost-effective and convenient choice for homeowners.

What We Like
Secure and rugged locks
Fits various mailboxes
Great overall product
Value for the price
What We Don't Like
Included latches may not fit
Quality of locks could improve
#TOP 10

VIDABTE 1570 Mailbox Lock

1570 Tenant Mail Box Lock Replacement
Silver
VIDABTE 1570 Replacement Mail Box Lock for 1570" F Series CBU & 4C Mail Units L-1172C C9100 National Mailbox. Replacement Tenant Mail Box Lock, Replacement USPS Mailbox Key Lock [with 3 Keys]
ftb score rating icon 8.8
FTB Score

The VIDABTE Mailbox Lock is an excellent solution for securing your mail. It is designed for use with the Florence F Series CBU and 4C Mail Units, ensuring compatibility and ease of installation. Made from high-quality metal, this lock promises durability and longevity, providing you with reliable security for your mail. With three included keys, you can easily grant access to trusted individuals while keeping your mailbox secure. This lock meets U.S. Postal Service standards, making it a trusted choice to help prevent mail theft and vandalism, giving you peace of mind about your deliveries.

What We Like
Heavy duty latch
Easy installation
Peace of mind
Beefy locking plate
What We Don't Like
Size compatibility issues
Buying Guide Image

The Best Mailbox Locks to Buy Right Now

Introduction

Choosing the right mailbox lock can be a daunting task. With so many options on the market, it can be difficult to know which one will provide the security and peace of mind that you need. In this article, we will discuss some key factors to consider when choosing a mailbox lock, as well as provide some recommendations to help you make an informed decision.

Types of Mailbox Locks

There are several different types of mailbox locks that you can choose from, each with their own unique benefits and drawbacks. Here are some of the most common types:

  • Keyed locks: These locks require a physical key to open them, and are considered one of the most secure options. Keyed locks are available in a variety of styles and sizes, so you can choose one that fits the aesthetic of your mailbox.

  • Combination locks: These locks use a series of numbers or letters to unlock them, rather than a physical key. Combination locks are convenient because you don't have to carry a key with you, but they can be prone to forgetting the combination.

  • Digital locks: These locks use a keypad to enter a combination, and are often equipped with features such as tamper alarms and the ability to change the combination. Digital locks are convenient and can provide added security, but they are more expensive than other types of locks.

Factors to Consider

When choosing a mailbox lock, there are several key factors that you should consider in order to make the best decision. Here are some of the most important ones:

  • Security: The primary purpose of a mailbox lock is to keep your mail safe from theft or tampering. When choosing a lock, consider its security features, such as the type of locking mechanism and the materials it is made from.

  • Convenience: You will be using your mailbox lock on a daily basis, so it is important to choose one that is convenient to use. Consider factors such as the ease of opening and closing the lock, as well as the availability of spare keys.

  • Compatibility: Make sure that the lock you choose is compatible with your mailbox. Some locks are designed for specific types of mailboxes, so be sure to check the specifications before making your purchase.

  • Price: Mailbox locks can range in price from a few dollars to several hundred dollars, depending on the type and features. Consider your budget and the value that the lock provides in terms of security and convenience when making your decision.

Recommendations

Here are some recommendations for mailbox locks that provide a good balance of security, convenience, and value:

  • The Master Lock Combination Mailbox Lock is a budget-friendly option that provides reliable security for your mailbox. It uses a combination lock that is easy to set and change, and is compatible with most standard mailboxes.

  • The Yale Real Living Keyless Touchscreen Deadbolt is a digital lock that offers enhanced security and convenience. It uses a keypad to unlock, and is equipped with features such as a tamper alarm and the ability to add and delete users.

  • The Medeco Maxum 11*603 Deadbolt is a high-security option that uses a keyed lock with a patented keyway to prevent unauthorized key duplication. It is made from hardened steel and is resistant to picking and drilling, making it a great choice for protecting your mail.

Conclusion

Choosing the right mailbox lock can be a challenge, but by considering the factors discussed in this article, you can make an informed decision that provides the security and convenience that you need. Whether you prefer a keyed, combination, or digital lock, there are options available to suit your needs and budget.

Frequently Asked Questions (FAQs)

1. What kind of locks are used on mailboxes?

Most mailboxes, including community collection boxes and individual secure mailboxes, use pin and tumbler locks as their standard lock mechanism.

2. Can I give my mailman a key to my mailbox?

According to the Postal Service regulations, mail carriers are not allowed to accept keys for locks on private mail receptacles, buildings, or offices, unless an electromechanical door lock system or key keeper box is used. However, Cluster Box Units (CBUs) have secure, locking mailbox and parcel locker compartments.

3. Do mailmen have a master key for a locking mailbox?

Yes, the United States Postal Service (USPS) uses a master key system that grants mail carriers access to different types of locking mailboxes. The USPS master key allows them to open multiple mailboxes within a specific area.

4. Can I pick my own mailbox lock?

If you have the necessary tools, such as lock-picking kits or improvised tools like hairpins or paperclips, you may be able to pick the lock on your mailbox. However, it is important to note that lock-picking someone else's mailbox without proper authorization is illegal.

5. What happens if my mailbox lock is broken?

If the mailbox is owned and maintained by the US Postal Service and it is damaged or broken, you should contact your local Post Office for assistance. However, if the mailbox is not serviced by the USPS, the responsibility for maintenance lies with the property owner or manager.

6. What does it mean when the mailman leaves a key in your mailbox?

When a mail carrier leaves a key in your mailbox, it is typically for accessing a parcel locker within a Cluster Box Unit (CBU). The parcel locker is used for storing larger items that cannot fit in the individual compartments of the CBU. The key left in your mailbox will have a tag indicating the specific parcel locker containing your item.

Editor's Notes

During our mailbox lock research, we found 24 mailbox lock products and shortlisted 10 quality products. We collected and analyzed 24,748 customer reviews through our big data system to write the mailbox locks list. We found that most customers choose mailbox locks with an average price of $12.28.

The mailbox locks are available for purchase. We have researched hundreds of brands and picked the top brands of mailbox locks, including Xinxinlin, VIXAVI, VIDABTE. The seller of top 1 product has received honest feedback from 385 consumers with an average rating of 4.7.

Written by

Harry Stack owns a small hardware store, his career landed him a depth of knowledge in categories such as tools, equipment, machinery and hardware. In his spare time, he usually repairs furniture, safes and appliances, and he knows how to make simple repairs to plumbing or electrical fixtures. His hobbies also include woodworking and fishing.

Mailbox Locks Comparison Table

#TOP1
#TOP2
#TOP3
#TOP4
#TOP5
#TOP6
#TOP7
#TOP8
#TOP9
#TOP10
Brand PRIME-LINE PRIME-LINE PRIME-LINE PRIME-LINE PRIME-LINE PRIME-LINE Xinxinlin VIXAVI PRIME-LINE VIDABTE
Special Feature Weather Resistant Key Unlock Weather Resistant Weather Resistant Weather Resistant Weather Resistant Key Lock Portable Keyless Anti-Corrosion
Lock Type Key Lock Key Lock Deadbolt Key Lock Key Lock Key Lock Key Lock Pin Tumbler Key Lock Mortise Lock
Item dimensions L x W x H 1.25 x 3.81 x 4.88 inches 1.25 x 3.81 x 4.94 inches 5.13 x 4 x 1 inches 5 x 4 x 1 inches 5 x 4 x 1.38 inches 3.25 x 4 x 0.63 inches - 1 x 1 x 2 inches 4.5 x 4 x 1.13 inches 1.03 x 0.72 x 1.36 inches
Material Alloy Steel Brass, Nickel Nickel,Steel,Brass Diecast Brass,Nickel,Steel Brass,Steel - Brass Nickel,Steel,Brass Metal
FTB Score
ftb score rating icon 9.9
ftb score rating icon 9.8
ftb score rating icon 9.6
ftb score rating icon 9.5
ftb score rating icon 9.4
ftb score rating icon 9.2
ftb score rating icon 9.2
ftb score rating icon 9.1
ftb score rating icon 8.9
ftb score rating icon 8.8
Where to Buy