While we're all waiting on the registration APIs to come back so we can look at accurate data, here's some probably inaccurate data to wildly speculate on in regards to New York registration. Everything is taken from this website:
http://archive.usfirst.org/whats-going-on which appears to have some old teams, duplicate teams, pre-rookies that are duplicates of existing teams, etc.
Please take this with a huge grain of salt, given some of the weird data.
That being said, I think the data is at least accurate enough to give us a "broad strokes" picture of what's happening in New York.
Out of 188* total teams, here's where they registered first:
8 Buckeye
17 Finger Lakes
1 Pittsburgh
5 Hudson Valley
1 Miami Valley
1 Midwest
1 Montreal
16 New York City
25 Long Island
13 Tech Valley
100* Not registered for a 2017 event as of 5:00PM EST
I arrived at this data by searching the above link for every team registered in NY in 2017, then looked up each team's page to see where they registered. There are probably mistakes. I've attached an excel sheet of the data I used. The first sheet is every team in NY*. The following sheets are a breakdown of registration for each of the 5 events in New York, also from the same site. I think overall, the registered team data is accurate enough, but some of the unregistered teams are likely garbage data*.
*These numbers include things that look like duplicate teams, old teams, and pre-rookie teams that show up in a search. Again, huge grain of salt.