Thee and Thou are still used in Northern England (Yorkshire and Lancashire). Although probably only by older people and often spoken as Thi and Tha.
> English dialects are hyper localized
On a vaguely related note, has anyone else (particularly in Yorkshire) use "seef"/"seefing" to mean "see if"/"seeing if" (as in "I was seefing/seeing if it was in the car")? I hear it all the time from my immediate family, but I've never been able to find it referenced beyond that.
Old Yorkshire phrase for telling children to mind who they address as 'thee / tha': "Don't thee tha them as thas thee" - kind of a similar sense as 'mind your Ps and Qs'.
'What about ye?' - would be a friendly way of asking 'how do you do?'