I would expect the ticket/members database to have the address / postcode of everybody that has bought a ticket over at least the past five+ years. Don’t you need to give an address to purchase a ticket these days?
I’d love to see a heat map of South Wales showing where the core numbers for season tickets and memberships are, and things like STs per population of each postal area… at least we’d get some insight then, like where the club needs to do some work to attract support. It’s very easy to do.