New Hampshire is the least religious state in the U.S., edging out Vermont in Gallup's 2015 state-by-state analysis. Mississippi has extended its eight-year streak as the most religious state, followed closely by neighboring Alabama. These state-by-state results are based on over 174,000 interviews conducted as part of Gallup Daily tracking in 2015, including more than 480 interviews in every state and more than 1,000 interviews in most states. Complete results and sample sizes are shown at the end of the article. Gallup classifies Americans into three religious groups based on their responses to a question measuring religious service attendance and...