I think Exeter (and surrounding regions) and Torbay might have something to say about that.
Cornwall is all Argyle though - does make me laugh when they talk of Devon being green and white, would say Devon itself is marginally more Exeter. Certainly true of those I know down this way
I went to Salford on Tuesday with a Plymouth supporting mate. Away support was excellent. Fair few Bury fans in the away end too. They proper hate Salford. Didn’t get back to Bristol till 2 so most of the Plymouth fans would have got home around 4am. Of course nowhere near as good as Gas support but pretty good.
Bit like Norwich in that respect.
But to flip it over ,when doing poorly............4k crowds, can't have it both ways .
BTW, I would say, all of Cornwall and half of Devon .