I think they still exist. at least in germany and the US, not sure if there are any in other countries.
and btw, they aren't actually blimps! they are Zeppelins, because they have a rigid inner body... also Goodyear actually did found a joint venture with the Zeppelin company in the 20s lol, so they are Zeppelins in both senses of the word
that's also the reason they still exist in germany, because I think the current ones are actually built by Zeppelin in Germany... not 100% sure about that tho.
I first heard about it in The Naked Gun and an old Ice Cube song. I spent many years before the Internet pondering just what in the hell 'a good year blimp' meant.