How Many People In The London Marathon

So, picture this: last April, I’m standing by the Cutty Sark in Greenwich, clutching a paper cup of lukewarm tea and trying not to elbow a guy dressed as a giant teabag. A runner shuffles past me, legs like overcooked spaghetti, and I hear him wheeze to his friend: “Mate, I swear there’s more people just watching than there are running.” He wasn’t wrong. And that, my friend, is the rabbit hole we’re diving into today: how many people actually run the London Marathon?

You’d think it’s a simple number, right? It isn’t. It’s a glorious, sweaty, logistical beast. The official figure usually hovers around 40,000 finishers on race day, but that’s just the tip of the iceberg. Let me explain why that number is both true and a massive lie at the same time. (I love when statistics do that.)

The 40,000 Club: The “Official” Number

Since the early 2010s, the London Marathon has capped its field at around 50,000 accepted entrants. Yes, accepted—because not everyone shows up. Life happens. Alarm clocks fail. Hamstrings cry in the night. On the day, you’re looking at roughly 40,000 to 43,000 souls crossing that finish line on The Mall.

In 2023, for example, there were 48,627 starters and 43,965 finishers. That’s about 4,600 runners who started but didn’t finish—maybe they got injured, hit “the wall,” or decided that a pub seat was more appealing. (Honestly, I don’t blame them. The wall is real, folks.)

So when someone says “40,000 people ran,” they mean 40,000 people finished. But the actual crowd on the course is bigger, messier, and far more interesting. You’re already ahead of the curve just for asking.

The Hidden Swarm: Ballot, Charities, and Golden Tickets

Now, here’s where it gets juicy. Those 40,000 finishers don’t just materialize from a magic ballot box. They come from three main pools, and each one has its own weird stories. First, the ballot: about one in twenty applicants gets a spot—roughly 17,000 people. The odds are worse than getting a table at a trendy restaurant on a Saturday night.

Then there are the charity runners, who raise thousands of pounds. London Marathons are basically a giant fundraising machine—nearly £70 million was raised in 2023 alone. And finally, the “Good for Age” and championship entries for speedy runners who can knock out a 3-hour marathon while the rest of us are still lacing up our shoes.

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Oh, and let’s not forget the elites. The Kenenisa Bekeles of the world. They’re maybe 100 people, but they move so fast they feel like a separate species. (You know who you are—you’re the one still reading this while sipping coffee, not running a sub-two-hour pace. Same, buddy. Same.)

The Real Headcount: Runners vs. Humans

But let’s step back. The question isn’t just about the runners—it’s about the total chaos on the day. The London Marathon isn’t a race; it’s a city-wide festival. Along the 26.2 miles, you’ve got roughly 750,000 spectators lining the streets. That’s nearly three-quarters of a million people cheering, handing out jelly babies, and ringing cowbells in your eardrum.

Add to that the 10,000 volunteers—the unsung heroes handing out water and peeling off your sweaty running vest if you faint—plus 1,500 medical staff, 500 pacers, and a swarm of “official” photographers. Suddenly, you’re looking at over 800,000 people involved in “the London Marathon.” The runners? They’re just the headline act in a circus of human endurance.

The Ironic Twist: “Running” the Numbers

Here’s the ironic part: no one really knows the exact number. Not even the organizers. Chip timing records starters and finishers, but folks jump in unofficially. There are “bandit runners” who sneak onto the course without a bib—maybe 500 to 1,000 of them. The official count ignores them, but they’re still there, jogging alongside the sanctioned herd.

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One year, a guy ran it dressed as a fridge. Nobody knows if he registered. The world just… accepted it. So the true answer is: about 40,000 official finishers, plus a few quirky ghosts. (And if you ever wonder if you could be one of those ghosts, the answer is “please don’t, you’ll mess up the water stations.”)

If you want a single, satisfying number to impress your mates, say “roughly 50,000 people run the London Marathon.” That covers starters, finishers, and the lottery losers who decided to “train” anyway and just jog parts of the route. It’s broad, it’s generous, and it’s almost true.

But the real magic of the London Marathon isn’t the count—it’s the scale of the shared experience. It’s one of the few days when a city of nine million people stops, looks at each other, and thinks: “Yeah, we can all do something ridiculous together.” And whether you’re running, cheering, or just reading this article in your pyjamas, you’re part of that number.

So next time someone asks, you can smile, lean in, and say: “It’s complicated, but also, it’s 40,000… plus a few thousand more who are having the time of their lives.” Now, pass the tea. You’ve earned it.