The U.S. Department of Education has released for the first time data on four-year high school graduation rates compiled with states' using a common measure. The rankings, based on preliminary data for 2010-11:

State 4-YEAR GRADUATION RATES, 2010-11
1 Iowa 88%
2 Vermont 87%
2 Wisconsin 87%
4 Indiana 86%
4 Nebraska 86%
4 New Hampshire 86%
4 North Dakota 86%
4 Tennessee 86%
4 Texas 86%
10 Illinois 84%
10 Maine 84%
12 Connecticut 83%
12 Kansas 83%
12 Maryland 83%
12 Massachusetts 83%
12 New Jersey 83%
12 Pennsylvania 83%
12 South Dakota 83%
19 Montana 82%
19 Virginia 82%
21 Arkansas 81%
21 Missouri 81%
23 Hawaii 80%
23 Ohio 80%
23 Wyoming 80%
26 Arizona 78%
26 Delaware 78%
26 North Carolina 78%
29 Minnesota 77%
29 New York 77%
29 Rhode Island 77%
32 California 76%
32 Utah 76%
32 Washington (state) 76%
32 West Virginia 76%
36 Mississippi 75%
37 Colorado 74%
37 Michigan 74%
37 South Carolina 74%
40 Alabama 72%
41 Florida 71%
41 Louisiana 71%
43 Alaska 68%
43 Oregon 68%
45 Georgia 67%
46 New Mexico 63%
47 Nevada 62%
48 Washington, D.C. 59%
* Idaho, Kentucky, Oklahoma no data
Source: U.S. Department of Education