We Have a Winner!

Reasonably sure I'm not the first to reply but here goes.

My guess is that it's near Three Forks, Montana. More specifically where 90 and 287 intersect. That'd put it right at the headwaters of the Missouri River and just down the road from Manhattan,

-Ben

Ben nailed it - even the bonus bits.
Good on ya' mate.
Especially impressive was getting the NYC borough - although I may be easy.