Where's the money? Manhattan and Arlington lead as highest-paying metros in the U.S.

Here is an interesting article from the The Business Journals measuring average salaries in counties across the United States.  Is it really a surprise that Manhattan and Arlington are currently generating the highest salaries?

Here an excerpt with some key data points from the article:

"New York County, N.Y. (a/k/a Manhattan), and Arlington County, Va., are the only major U.S. counties where average compensation is higher than $100,000 per job, according to the latest figures available from the U.S. Bureau of Economic Analysis.

Manhattan’s 2.75 million workers earned an average of $109,028 in 2009, while Arlington’s 205,000 employees took home $102,373 per job."