Wirral is basically split in two ; West Wirral and East Wirral. West Wirral has West Kirby, Heswall, Caldy etc and is very affluent (Caldy being millionaires row) and East Wirral has Seacombe, Poulton, Birkenhead etc. and is a bit like Skatesmuff.
Having lived and worked on Wirral for the past 20 years I have to agree with Pap that the majority of football fans are Liverpool, Everton, Manure and not Tranmere.
Just for info I live in Meols (West Wirral) - there is a few Saints around Wirral and across the water in Liverpool.