New York is #1

We're the top: CONVERSABLE ECONOMIST: U.S. Public Schools: Unequal Spending Across States

For the U.S. as a whole, average public school K-12 current spending per student was $10,560 in 2011, with 61% of that going to "instruction," and 35% going to "support services."
But four jurisdictions--New York, Wyoming, Alaska, and the District of Columbia--spend more than $16,000 per K-12 student, with New York leading the way at $19,076 per student. Conversely, Idaho, Utah, Arizona, Oklahoma,and Mississippi spend less than $8,000 per student, with Utah having the lowest tally at $6,212 per student. That is, New York spends on average three times as much per K-12 student as does Utah.

Of course, the money is well-spent.
Or then again, maybe not.