My favorite is “Slower Delaware” (for everything south of Dover).
Yes but ‘up the river’ originally referred to Sing Sing, which is in Ossining in Westchester county, which just no way is ‘upstate NY’ by any modern sensibility. In fact ‘Downstate Correctional Facility’ is in Fishkill in Dutchess, north of there and in the arguable subjective zone as to what’s ‘upstate NY’ or not.
Downstate though is a very rarely used term compared to upstate, IME living in the area most of my life.
This is the standard terminology with islands, in my experience.
I know is not on the north south divide but Cape Cod is divided as:
Lower Cape
Mid Cape
Outer Cape
What does that have to do with anything?
Or a larger speech thing. New Yorkers stand on line, but most Americans, I think, stand in line.
Now if only people would say “put contact lenses on” instead of “in” I would be happy.
I’m saying that “on [islandname]” is the standard locution, not at all special to New Yorkers or Long Island.
On Nantucket. On Daufuskie. On South Padre.
No argument. Unless Purgatory is an island.
In Minnesota, we have the Minneapolis-St. Paul & suburbs ‘metro area’ (where half of the states population lives) and the rest of the state, commonly referred to as outstate or non-metro. Sometimes called small town/rural Minnesota. (There are also 2 other population centers, Duluth & Rochester – they are generally referred to by name.)
Recently, some people consider it politically incorrect to use outstate or non-metro – they want to use greater Minnesota to refer to those areas. But this seems to be dying out 9except in political speeches). I think Zipfs Law will eventually end it.
Another non-dispositive data point: Google Ngram has a ton of usage for upstate New York, but "Ngrams not found: Upstate Florida, Upstate Michigan, Upstate Maine, Upstate Wisconsin, Upstate Pennsylvania. "
Another interesting point is that Upstate New York doesn’t appear until the mid-1930s.
Edit: it’s fun to play around with the Ngram, trying different capitalizations.
I disagree. It’s basic usage data. The question asked by the OP (so many years ago) was "Do states other than NY have an ‘Upstate’? Basic word usage metrics imply that some do, but not used nearly so often as NY.
This is not a thesis, which aims to get to the fundamentals of where and why and how often such terms are used, and how applied. It’s barely a first level review of easily harvested data which has association with the question raised. It’s the first place to go when approaching such a question. I’m surprised at your surprise. :dubious:
!
I choose to read that as you converting “I’m surprised at your surprise” into surprise[factorial].
Upstate’s a relative term.
I used to live in Orange County, NY. in a town less than 60 miles from the George Washington Bridge. I referred to it as “upstate” when on location in NYC.
That is, till I had a guy say, " Bullshit. I grew up in Watertown. THAT’S Upstate !! You’re in the suburbs ! "
Fair enough. 
Still, for most of NYC folk, anything past Westerchester or Rockland Counties is considered Upstate.
Not to mention certain “Goodfellas” 