How Many Rats Are In London

Have you ever been on the Tube, waiting for a delayed train, and wondered who else is down there with you? Not just the tired commuters, but the real locals. I’m talking about the city’s most resilient residents: rats. The big question is, how many of them are actually sharing our London?

You’ve probably heard the old myth: there’s a rat for every person in London. That would put us at roughly 9 million scampering critters. We imagine them forming their own underground society, complete with rush hour and tiny Oyster cards. But is that number actually true, or just a creepy urban legend?

The Myth vs. The (Sort of) Reality

Spoiler alert: that 1:1 ratio is mostly nonsense. Experts who actually study these furry neighbours say the real number is much, much lower. Most current estimates from pest control pros suggest a population between 500,000 and 1 million rats.

Still, half a million is a lot of whiskers and tails. To put it in perspective, that’s about the same number of people who live in a city like Glasgow. Imagine every single person in Scotland’s biggest city scurrying through your alleyway—kind of makes you look at that bin a little differently, doesn’t it?

Why So Few (Compared to the Myth)?

The old myth came from a dodgy 1909 study about brown rats in the English countryside. It was never meant for cities. Modern research, like the super cool "Rat City" project in New Orleans, shows urban rats have smaller home ranges and rely on our messy habits, not magic numbers.

Plus, think about it: if there were 9 million rats, we’d be tripping over them constantly. They’re sneaky, but not that sneaky. Actually, a single female rat can have up to 84 babies a year, so without predators and pest control, London would be a furry ocean pretty quickly.

Where Are They Hanging Out?

Rats love the Underground—not just for the trains, but for the tunnels and warm, dark cracks. The Tube network is essentially a rat superhighway. They also adore our parks, canal banks, and the junk food we leave behind.

Fun fact: the average rat can squeeze through a hole the size of a 20p coin. That’s how they get into your compost bin or that dodgy kebab shop’s basement. They’re like liquid with teeth, and they’re incredibly good at hiding.

The Cool Part: They’re Actually Geniuses

Okay, so the number is smaller than the myth, but that doesn’t make it less interesting. London rats are super-adapters. They have evolved to handle our city’s chaos, and they’re surprisingly clever. Some studies show they can learn to avoid poison after just one nibble.

Think of them as the city’s unofficial cleanup crew. They eat our food waste, and without them, London would be a much smellier, more gnat-filled place. Gross? Sure. Essential? Maybe a little bit. They’re nature’s tiny, hairy garbage disposals.

So, The Final Number?

No one has taken a census of every rat in London. That would be a terrible job. But the best guess from the National Pest Technicians Association is that the population sits somewhere around 800,000 rats, give or take a hundred thousand.

That means for every 11 humans in London, there’s roughly one rat. Not exactly an army. More like a quiet, skittish punk band living in your walls. And honestly? Knowing they’re not outnumbering us 1-to-1 is a pretty comforting thought for your next night walk home.

Next time you hear a scratch in the ceiling, just remember: it’s probably just one of London’s 800,000 weird, intelligent, and slightly gross roommates. Say hi... from a safe distance. And maybe don’t leave that pizza box by the bin tonight.