Here's a list that's a year or so old,only lists 14 states,I've heard 16 lately tho....
Bowhunting certification is not mandatory in Florida to purchase a license, however, the Florida Fish and Wildlife Conservation Commission (FWC) volunteer instructors provide this course as an additional service to those who plan to bowhunt in a state that requires the additional certification, as well as those hunters who want to learn more about safe bowhunting. The 14 states that require NBEF Bowhunting Certification are Alaska, Connecticut, Idaho, Kansas, Louisiana, Maine, Montana, Nebraska, New Hampshire, New Jersey, New York, Rhode Island, South Dakota and Vermont. It is also required in the Canadian provinces of New Brunswick, Nova Scotia and Quebec