"Biggest clubs" by area

It's county lines. Or Unitary Authority lines, I think. So Stadium of Light is within Tyne and Wear.

Don't think Sheff Utd are bigger than Wednesday.
 
And Middlesbrough isn't in North Yorkshire, nor Hartlepool in Durham if you're using the modern boundaries.

Yes, they are.

They have been since 1996.

That's a map of the current ceremonial counties of England, not administrative boundaries, and both towns have been part of those respective ceremonial counties since Cleveland was abolished.
 
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