This second edition bibliography is intended as a guide to the regional (state and provincial) herpetofaunal literature of the United States and Canada through December 31, 2023. This edition includes over 1300 references. We have limited our scope to include those published papers and books that deal primarily with single states or provinces or substantial portions thereof. Regional works of broader scope, covering up to three states or provinces have also been included. Only in cases of New England (Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont) and the Maritimes (New Brunswick, Newfoundland, Nova Scotia, and Prince Edward Island) have more inclusive areas been admitted. Most publications dealing with smaller areas, such as counties, have not generally been included. Some in depth county reports (i.e., longer than ten pages) are included, since they normally contain information beyond the county boundaries. However, works dealing with large parks, significant drainage basins, mountain chains, and other subcomponents of individual states have been included on a case-by-case basis.