--- - |2 Abstract The proportion of people in the United States who identify as unaffiliated with any religious tradition (Nones) has risen steadily since the 1990s. Empirical investigations have examined this phenomenon, and point to a range of sociodemographic and associational variables as significant predictors of religious nonaffiliation. To build on these, the research reported here uses nearly five decades of General Social Survey data and binary logistic regression to examine change over time in the direction and size of effect on the likelihood that various factors predict religious nonaffiliation. While some factors (like age and political orientation) behave as expected over time, other factors decrease in their effect on likelihood (e.g., residence in the Far West), lose effect on likelihood (e.g., being college‐educated), or never showed likelihood of effect in the first place (e.g., residence in New England). - 'Journal for the Scientific Study of Religion, Volume 58, Issue 3, Page 707-724, September 2019. '