What auto company had a model call the
"COSMOPOLITIN" ???

Since you are using the past tense you must mean the Lincoln Cosmopolitan circa 1949. Lancia has the Y Cosmopolitan for 2002.

Great looking Lincoln...Ever see the slant back model Cosmo ?? Prettiest car in '49

Comopolitan, yes..... but what about the Metropolitan? Anyone remember?

They were before my time, but not too long ago I saw a Nash Metropolitan parked on a street in Spokane, WA. It was an ugly lime green (ugh!) and my wife and I would have a hard time squeezing into it as we are both a bit on the big side.

The ole Metro----OOOOOOH YAAAAAA...
In '67, My folks had one-and believe this or not-drove it from Anchorage, Alaska all the way to Indiana...So you say,so what??? Well , he pulled a pop-up camper with it....
The damn camper was longer than the lil red and white Metro....
He also traded cars in Indiana...full size Pontiac...

Donrent: I absolutely believe that. The Metro had an Austin 4 cylinder that ran like a little watch. Do you remember the shifter on the dash and not the tree?

.........and then there was the Isetta....

My brother-in-law has one. Really tiny thing, matchbox size.