From
http://www.packing.org:
Alaska, Florida*, Georgia, Idaho, Indiana, Kentucky, Michigan*, Missouri, Montana, New Hampshire*, North Carolina, Oklahoma, Pennsylvania, South Dakota, Tennessee, Texas, Utah, Vermont and Wyoming.
(If you are a non-resident of Pennsylvania, subtract Florida, Michigan and New Hampshire.)
If you add a non-resident New Hampshire license, you get to add Alabama, Colorado, Louisiana, Mississippi and North Dakota. Only $20 for four years.