Trying to count all third-party online marketplaces is a bit like trying to count every fish in the ocean. You can count the big ones. You can spot many small ones. But new ones appear all the time, and some disappear before lunch.
TLDR: There is no single official number for how many third-party online marketplaces exist. Globally, there are likely thousands of active marketplaces, and possibly tens of thousands if you include small, local, niche, and B2B platforms. The big names are easy to find, but the tiny ones are harder to track. The number keeps changing every day.
First, what is a third-party online marketplace?
A third-party online marketplace is a website or app where many sellers can sell to many buyers. The marketplace does not own all the products. It mostly provides the digital “shopping mall.”
Think of it like a busy street market. The platform owns the street. Sellers bring the goods. Buyers walk around and shop.
Famous examples include:
- Amazon Marketplace
- eBay
- Etsy
- Walmart Marketplace
- AliExpress
- Shopee
- Mercado Libre
These platforms let outside sellers list products. That is the key part. If only one company sells its own items, it is not really a third-party marketplace.
So, how many are there?
Here is the simple answer: nobody knows the exact number.
There is no global “marketplace police” keeping a master list. There is no giant book called Every Marketplace Ever. That would be handy. It would also be out of date in five minutes.
But we can make a smart estimate.
There are likely several thousand major and mid-sized third-party marketplaces around the world. If we count smaller marketplaces too, the number may rise to tens of thousands.
Why such a big range? Because marketplaces come in many shapes and sizes. Some are huge. Some serve one country. Some serve one city. Some sell only handmade soap, old car parts, farm tools, used books, pet supplies, or industrial pumps.
Why the number is so hard to count
Counting marketplaces sounds easy. Search online. Make a list. Done, right?
Not quite.
Here are the main problems:
- New marketplaces launch all the time. It is easier than ever to build one.
- Many marketplaces are local. They may only operate in one country or region.
- Some are very niche. They sell one type of product to one type of buyer.
- Some are private. Business marketplaces may not be visible to the public.
- Some close quickly. A marketplace can launch, struggle, and vanish fast.
- Definitions vary. Not everyone agrees on what counts.
For example, is a food delivery app a marketplace? Often, yes. Restaurants are third-party sellers. Customers are buyers. The app connects them.
Is a freelance platform a marketplace? Yes. Sellers offer services instead of products.
Is a real estate listing site a marketplace? Sometimes. It depends on how it works.
This is why the number gets fuzzy.
The big buckets of marketplaces
To understand the size of the marketplace universe, it helps to sort it into buckets. Fun buckets. Digital buckets. Buckets full of carts.
1. Retail marketplaces
These sell physical goods. Clothes. Phones. Toys. Tools. Furniture. Snacks. All the stuff that makes your delivery driver sigh.
Examples include Amazon, eBay, Walmart Marketplace, Rakuten, Shopee, Lazada, and Mercado Libre.
2. Handmade and creator marketplaces
These focus on artists, makers, designers, and small shops. You might find jewelry, prints, candles, pottery, or a mug that says something funny about coffee.
3. Service marketplaces
These connect buyers with people who do work. Writers, designers, tutors, cleaners, repair workers, drivers, and consultants can all sell services online.
4. Travel and rental marketplaces
These include vacation rentals, car rentals, tour guides, boat rentals, and experiences. Here, the “product” may be a place to sleep or a kayak on a lake.
5. Food and grocery marketplaces
These connect customers with restaurants, grocery stores, or delivery shoppers. The food is from third parties. The app handles ordering and payment.
6. B2B marketplaces
B2B means business to business. These marketplaces help companies buy from other companies. They can sell raw materials, office supplies, machine parts, chemicals, packaging, or wholesale goods.
This category is huge. It is also harder to see because many B2B platforms are not built for everyday shoppers.
The giants are only the tip of the iceberg
Most people know the giant marketplaces. They get the headlines. They have big ads. They have apps on millions of phones.
But below them is a massive layer of smaller marketplaces.
There are marketplaces for sneakers. Marketplaces for watches. Marketplaces for refurbished electronics. Marketplaces for farm equipment. Marketplaces for medical supplies. Marketplaces for digital products. Marketplaces for vintage clothes. Marketplaces for collectibles. Marketplaces for car parts.
If humans collect it, trade it, rent it, repair it, eat it, wear it, or panic-buy it at midnight, there is probably a marketplace for it.
How many major marketplaces are there?
If we only count marketplaces with serious traffic, strong seller bases, and broad public visibility, the number is much smaller.
Globally, there may be hundreds of large online marketplaces. These include major platforms in North America, Europe, Asia, Latin America, Africa, and the Middle East.
Then come regional and category leaders. These may be very important in one country or industry. Add those, and the number grows into the low thousands.
Now add small niche marketplaces. Add local platforms. Add B2B networks. Add app-based service platforms. Suddenly, the number may become many thousands.
Why so many marketplaces exist
Marketplaces are popular because they solve a simple problem.
Buyers want choice.
Sellers want customers.
The marketplace stands in the middle and says, “Great. Let’s make this less awkward.”
A good marketplace handles search, listings, payments, reviews, messages, and sometimes shipping. That makes life easier for both sides.
Also, marketplaces can grow fast. They do not need to own every item. They can invite sellers to bring inventory. More sellers bring more products. More products bring more buyers. More buyers bring more sellers.
This is called a network effect. It is also called “the snowball gets very large and rolls down the hill.”
Are social media shops marketplaces too?
Sometimes, yes. Sometimes, no.
If a social platform lets many sellers list products, take payments, and sell to buyers, it can act like a marketplace. But if it only shows ads that lead to separate websites, it may not count.
This makes counting even messier. Social commerce is growing fast. More buying now happens inside apps, chats, livestreams, and creator pages.
The line between “marketplace,” “store,” “ad platform,” and “social app” keeps getting blurrier.
What about failed marketplaces?
Ah yes. The digital graveyard.
For every successful marketplace, many others fail. This is normal. Marketplaces are hard to build.
You need buyers and sellers at the same time. If buyers show up first, there is nothing to buy. If sellers show up first, there are no customers. It is like hosting a party where the snacks and guests arrive on different days.
Because of this, many marketplaces never get enough activity. They close, merge, or turn into regular online stores.
The best answer
So, how many third-party online marketplaces are there?
The best answer is:
- Hundreds of very large and well-known marketplaces.
- Thousands of serious regional, national, and niche marketplaces.
- Tens of thousands if we include small, local, private, B2B, service, and emerging platforms.
There is no fixed number. The marketplace world is alive. It grows, shrinks, splits, merges, and reinvents itself all the time.
Final thought
Online marketplaces are everywhere now. They help people buy sneakers, hire plumbers, book cabins, order noodles, sell art, rent tools, and source factory parts.
The exact number does not matter as much as the trend. The trend is clear. More commerce is becoming marketplace commerce.
So the next time someone asks, “How many third-party online marketplaces are there?” you can smile and say, “More than you think, fewer than tomorrow, and enough to keep your shopping cart very busy.”