you chance to win IIN gold!!!!@@@

I'll guess, and I'll try and have some logic behind it.

The most populous county is, unsurprisingly, Greater London. I'll discount that though, because Londoners tend to think more about their city or borough rather than county. Also, London is far too obvious.

The second most populous is the West Midlands, but the same logic applies as it would for London; there are a number of large cities in the West Midlands so I'd be surprised if you thought to ask about your county as opposed to your city.

The third most populous is Greater Manchester. We've had our fill of Mancunians here though, so I'll discount this one. I know probability doesn't work like that, but whatever.

The fourth most populous is the one which I'll go for: West Yorkshire. We seem to have more northerners than southerners on IIN, and I can't think of a reason to discount West Yorkshire.

I wanted to choose Gloucestershire because that's where I'm from, but the odds are too short.

West Yorkshire.