Don't think they're a bigger club than Leeds, like.
Until you live in London, you don't realise what a massive club West Ham are. Just about the whole East End of London supports them with quite a bit of Essex.
Certainly better supported in London than Chelsea imo.
I'd agree. Me mam is/was a hammer and is from Stepney. They're heavily supported in east London, and also south-east London which in theory should be Charlton and Millwall. Been to Colchester and Southend in Essex, and seen tons of West Ham shirts rather than the smaller clubs.
Their fans still do like to dwell on 'we won the World Cup', like.