Finland

Finland is another country that doesn't exist.

Reason it doesn't exist
There are allegedly 6.5 million Finns, right? That's out of a 7.125 billion humans. That means Finns make up 0.0912% of the planet.

That's not 9% - that's point zero nine percent, less than a percent, less than a tenth of a percent.

To put that another way, 99.9% of the planet are not Finns. How do we know this? Government censuses.

Now, the best government censuses have a margin of error at least 1%. So Finns make up 0.0912% of the planet, plus or minus one percent.

In conclusion: there is a 50/50 chance Finland doesn't exist.