I seem to remember learning that in general, rhotic accents (ie ones that pronounce non leading 'r's) are in rural areas, and non-rhotic ones are from urban areas. This is in England, and I think the opposite is true in the US?

I say inVENtory, clemAYtis, HUNta (with the h pronounced as a spanish J) and oreGAHno. Oh, and jammies, jahmas or jim-jams(for pajamas)

Bagpuss