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The U.S. Department of Education says Iowa has the top high school graduation rate in the nation.

Iowa's rate for the 2010-2011 school year was 88-percent.

Wisconsin and Vermont shared the second-best graduation rate at 87-percent.

This is the first time the U.S. Department of Education has used a common measure for all states.

The Iowa Department of Education director, Jason Glass says there's still plenty of work to do.

“This is a moment to celebrate it’s something to be proud of but when dig in to data of who’s graduating from our schools we see achievement gaps in terms of our students with economic disadvantages, students with disabilities, students that are minorities  -- we have areas to address so we’re getting all kids to graduate,” says Glass.

The report shows the District of Columbia with the lowest graduation rate at 59-percent.