Zeldar asked to get this thread closed, leaving us without and answer to the question which spot in the U.S. has seen the most Dopers.
My sense of what people were posting (and I’ll admit I didn’t crunch a single number) yielded a list of seven semi-finalists.
Which of the following have you been to?
Atlanta airport
The Grand Canyon
Los Angeles
Las Vegas
New York City
O’Hare Airport
Orlando
I’ve been to all but the Grand Canyon.
Of your list, I’ve only been to NYC.
I’ve been to all except Las Vegas and (maybe) O’Hare.
Hmm, of those places, I’ve only ever been in O’Hare Airport. I’ve been close to New York City, but I never actually got around to actually visiting it. 
All but LA; I consider myself lucky.
Only O’Hare.
LA, Vegas, NYC, Orlando.
LA
San Diego
San Francisco
Orlando
New York, New York
Wash. D.C.
Harisburg PA (The capital of PA)
York PA (Touted locally as the first capital of the US)
Gettysburg PA (A historic Landmark)
Pittsburg PA
Philidelphia PA
Chicago
Boston
Baltimore
Dallas
I’ve been to:
The Grand Canyon
Los Angeles
Las Vegas
New York City
I’ve been to all
Atlanta airport +1
The Grand Canyon +1
Los Angeles +1
Las Vegas +1
New York City +1
O’Hare Airport +1
All but Orlando.
I’m going to be totting up the numbers – so if you want to weigh in, pls. list which of the seven spots in the OP you’ve been to. Otherwise I’m just going to skip this post.
I hadn’t taken a look yet at that other thread, but of these, I’ve been to all of them. (I’ve been to 48 of the 50 states, Canada, Mexico and England)
Atlanta airport
Los Angeles
New York City
O’Hare Airport
All of them.
Fair enough. 
I’ve been to:
Atlanta airport
New York City
O’Hare Airport
Orlando (only to the airport; does that count?)
All but the Grand Canyon.
I hope to correct that oversight this autumn.
So far (and including Colibri as a yes for O’Hare and gardentraveler as a yes for Orlando):
Atlanta airport: 11
Grand Canyon: 8
Los Angeles: 11
Las Vegas: 10
NYC: 14
O’Hare: 13
Orlando: 9