Idaho ranked 13th best state for business

Not only did Idaho significantly improve its ranking on CNBC's annual Top States for Business report, moving from 31 to 13, the state is also one of the most improved in 2012.

Some states move up more spots than others. Some move fewer spots but finish higher in the rankings, usually breaking the top 10 or top five.

This year is no different. By one measure or another, North Dakota, Wyoming and Idaho can claim the honor of most improved in 2012.

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Read CNBC's overall rankings for 2012 here