In the begining of the Jetsons you see the planet where the Jetsons live. I belive it's supposed to be earth but it looks like where Californa is, is connected to South America and Mexico isn't connected to South America.
weell duh its earth,this is like the flinstones,its supposed to be earth in another time. In this case,its earth's future,which we can tell is not happening anytimes soon,let me tell you. Flying cars aree a thing of the past. but anyways,yes,it is earth,only in the year like, 9457 or something.just really far into the future. deal with it buddy,it is earth.
http://members.aol.com/howard217/epgs/thejetsons.html
The Jetsons is supposed to represent America (don't worry about the rest of the world; we're fine about being left out by egotistical American thinking AGAIN) in the year 2062. So it's sorta supposed to be relatively close to our time (as opposed to the year 9000+ or whatever).
I don't really know if on the show they say its Earth or not, but I have to point something out..If they never say that its Earth, why are you all so positive that it absolutely HAS to be Earth?