---
title: "Mailbox Letters — $98K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/mailbox-letters"
last_updated: "2026-08-09T00:48:37.416Z"
locale: en
meta:
description: "Niche score 56/100 · $98K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · $98K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Mailbox Letters — $98K/yr Amazon US Niche (2026) - Flapen"
---
# **mailbox letters**
**Worth a look**
Shows no brand lock-in (top 5 brands take 48% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 24Growth 51Conversion 62Competition 76Returns 81Price range 32Avg price 32Brand share 87Review moat 47Quality gap 50
**Brand share**
**Great****48%**
top-5 brand share — no brand owns this niche
**Returns**
**Great****1.7%**
return rate — above 5% kills the launch gate
**Competition**
**Great****39%**
top-5 click share — an open shelf
**Conversion**
**Good****5.5%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Good****+21.6%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Good****4.5★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****1,849.35**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Okay****$9.84**
avg listing price — sweet spot $15–$100
**Price range**
**Okay****$2.32–$21.00**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Bad****$98K**
$98K/yr · 181K searches
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United States niche tracking, mailbox letters is a $98K/yr Amazon United States market (181K searches/yr). The top 5 brands hold 48% of demand. Verdict: Worth a look — 56/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **mailbox letters market data**
- **Units sold / yr**
- **8K–10K**
- avg 100–250/product
- **Revenue / yr**
- **$79K–$98K**
- units × avg price
- **Conversion rate**
- **5.5%**
- **Avg BSR**
- **#89**
- **Page quality**
- **0%**
- **Prime**
- **81%**
- **Sponsored**
- **95%**
- **Out of stock**
- **3.3%**
- **Avg brand age**
- **38 months**
- **Avg seller age**
- **168 days**
## **Competition & brand share**
Clicks spread well past the top 5 (39% combined) — an open shelf where new products get seen.
**Brands**
**30 **▲rising
**Sellers**
**43**
**Top-5 brand share**
**48%**
Top 20: 92%
**Top-5 click share**
**39%**
Top 20: 79%
**Open market**
**46%**
- olaine16% - Aeaocvo10% - Zonon8% - LESOON8% - ynhay7% - Llewyn6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +21.6% search growth over the last 90 days.
4K3KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.6×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/mailbox-letters/trend)
## **Top mailbox letters search terms**
- **mailbox letters**67K/yr+27.8%4.1% conv. - **mailbox letters and numbers for outside**29K/yr+23.1%4.4% conv. - **mailbox lettering**12K/yr+57.7%2.5% conv. - **mailbox numbers and letters**15K/yr-19.9%3.8% conv. - **letters for mailboxes for outside**9K/yr+40.6%3.8% conv. - **mail box letters**7K/yr+30.2%3.6% conv. - **letters for mailbox**8K/yr+30.7%3.7% conv. - **mailbox letters and numbers**11K/yr-20.0%3.6% conv. - **mailbox numbers and letters for outside**6K/yr+9.4%5.1% conv. - **mailbox letters for outside**5K/yr+19.9%4.8% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/mailbox-letters/search-terms)
## **Top mailbox letters products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%3%$3K6%$6K9%$9K12%$12K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**2 inch Self-Adhesive Vinyl Alphabet Letters Numbers Kit Modern Mailbox Numbers Sticker for Mailbox Signs Window Door Cars Trucks Home Business Address Number Name Craft (Pure White)**olaine**$6.94**4.5★1,208 rev](https://www.amazon.com/dp/B0CFKCRT82) [2**138 Pcs 2 Inch Mailbox Letters and Numbers for Outside Self-Adhesive Vinyl Alphabet Letters Numbers Kit White Letter and Number Stickers Address Number for Mailbox Signs Cars**Aeaocvo**$5.99**4.4★141 rev](https://www.amazon.com/dp/B0F7XFC9ZW) [3**LESOON Mailbox Numbers Street Address Reflective Vinyl Decal Personalized House Numbers for Mailbox Custom Apartment Office Stickers - CMN02**LESOON**$18.66**4.5★1,365 rev](https://www.amazon.com/dp/B0BH1C6L88) [4**YNHAY 480 Pcs Waterproof 3 Vinyl Alphabet & Number Stickers - Self-Adhesive for Mailboxes Windows Doors Signs Vehicles & More Black**ynhay**$9.81**4.5★1,008 rev](https://www.amazon.com/dp/B0D2DBZM2Q) [5**132 Pcs 2 Reflective Mailbox Numbers Letters Stickers for Outside Self Adhesive Numbers and Letters for Address Mailbox White Vinyl Waterproof Stick on Address Decals for House Sign Door Cars Home**YINBEI**$13.91**4.7★269 rev](https://www.amazon.com/dp/B0B7SJYJTH)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**144 Pcs 3 Inch Vinyl Waterproof Letter Stickers 9 Sheets Self-Adhesive Alphabet Number Stickers for Mailbox Signs Window Door Address Number (White 3 Inch)**YEODEESN**$7.06**52 rev4mo ago](https://www.amazon.com/dp/B0GSGY64HL) [**Reflective Mailbox Numbers For Outside Personalized Address Decals | Custom Mailbox Number Stickers | Waterproof Vinyl Letters And House Number Decals For Mailboxes And Outdoor Address**GuyDoOk**$19.89**187 rev11mo ago](https://www.amazon.com/dp/B0CKYRSF4Y) [**AmazingSpark White Mailbox Letter and Number Stickers Vinyl Self Adhesive Street Address Stickers Waterproof Alphabet Number Decals for Modern Mail Boxes Window Door Car Signs(Classic 2 Inch)**AmazingSpark**$9.89**25 rev1y ago](https://www.amazon.com/dp/B0FH695G7T) [**138 Pcs 2 Inch Mailbox Letters and Numbers for Outside Self-Adhesive Vinyl Alphabet Letters Numbers Kit White Letter and Number Stickers Address Number for Mailbox Signs Cars**Aeaocvo**$5.99**141 rev1y ago](https://www.amazon.com/dp/B0F7XFC9ZW) [**1000 Pcs 2 Inch Waterproof Vinyl Mailbox Letter and Number Stickers Black**wavamawa**$8.99**170 rev1y ago](https://www.amazon.com/dp/B0F1KKS32S)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**144 Pcs 3 Inch Vinyl Waterproof Letter Stickers 9 Sheets Self-Adhesive Alphabet Number Stickers for Mailbox Signs Window Door Address Number (White 3 Inch)**YEODEESN**$7.06**4.5★**▲ 250%**](https://www.amazon.com/dp/B0GSGY64HL) [**50 PCS 2 inch Reflective Adhesive Mailbox Numbers Waterproof Vinyl Number Stickers with Easy-Peel Tabs Includes Squeegee & Masking Tape Strong Self-Adhesive House Numbers Practical Gifts**olaine**$8.93**4.6★**▲ 119%**](https://www.amazon.com/dp/B09TJKF9KN) [**2 Inch Large Vinyl Letter & Number Stickers 10 Sheets of Self-Adhesive Alphabet Mailbox Numbers & Symbols for Bulletin Boards Crafts Windows Doors Classroom & Home Decor White**LAJEBZOM**$5.73**4.5★**▲ 92%**](https://www.amazon.com/dp/B0DZCM72JJ) [**1000 Pcs 2 Inch Waterproof Vinyl Mailbox Letter and Number Stickers Black**wavamawa**$8.99**4.6★**▲ 78%**](https://www.amazon.com/dp/B0F1KKS32S) [**Reflective Mailbox Numbers Sticker with Custom Initial Monogram Modern Number Vinyl Mailbox Lettering Decal Self Adhesive Sticker for Signs Door Cars Trucks Home Business Address Number**OLADOT**$9.63**4.4★**▲ 65%**](https://www.amazon.com/dp/B099Z7JCS2)
**~~View all trending →~~**
## **What buyers say about mailbox letters**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**22%
*“BEST QUALITY”*
**Ease Of Use**13%
*“Easy to put on”*
**Adhesion/Stickiness**9%
*“Adhesive is strong”*
**Size-Overall**9%
*“Perfect size”*
**Advertised Vs Actual Product**9%
*“As Advertised”*
**Value For Money**8%
*“Price is appropriate”*
**Assembly/Installation**5%
*“Easy to install”*
**Durability**4%
*“seems very durable”*
**Reflectiveness**2%
*“Reflective look is clear”*
**Design-Overall**2%
*“The look is great”*
### **What buyers complain about **
**Adhesion/Stickiness**29%
*“Adhesive sucks”*
**Durability**13%
*“Not durable at all”*
**Quality-Overall**11%
*“Absolute garbage”*
**Value For Money**5%
*“Which I could have gotten for far less $ any number of places”*
**Ease Of Use**4%
*“Difficult to peel”*
**Instructions/User Manual/Troubleshooting**3%
*“The directions could be better”*
**Size-Overall**3%
*“wrong size”*
**Thickness**3%
*“Letters are extremely thin”*
**Functionality-Overall**3%
*“Didn't work”*
**Reflectiveness**2%
*“These are not reflective”*
### **Top return reasons **
**Size-Overall**64%
**Color**8%
**Adhesion/Stickiness**7%
**Advertised Vs Actual Product**7%
**Value For Money**3%
**Functionality-Overall**2%
**Quality-Overall**1%
**Thin**1%
**Shape/Style**1%
**Defective Material/Parts**1%
## **Common questions**
- **Is mailbox letters profitable to sell on Amazon United States?**
- The niche generates $98K/yr across 43 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is +21.6%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the mailbox letters niche?**
- 30 brands and 43 sellers compete. The top 5 products take 39% of clicks and top 5 brands hold 48% of demand.
- **What do buyers complain about in mailbox letters?**
- Top complaints mined from reviews: Adhesion/Stickiness, Durability, Quality-Overall. The return rate is 1.7%.
- **When does demand for mailbox letters peak?**
- Demand is steady year-round — the busiest month runs 1.6× the quietest.
- **What does it cost to enter the mailbox letters niche?**
- Listings span $2.32–$21.00; the average listing price is $9.84 (sweet spot $15–$100). The average incumbent carries 1,849 reviews — the moat a new listing must climb.
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