Emergent religious groups (ERGs) are an innovative but chronically understudied and misunderstood realm of contemporary religion. This may be due to notorious difficulties encountered when estimating the size of populations involved with emergent religious groups at any given time. The purpose of this article is to estimate the percentage of the U.S. population involved with ERGs over the past 50 years. Findings from three national surveys suggest .2-2.2% of the United States population involved with ERGs regardless of year. ERGs are (...) a viable case for quantitative sociologists of religion, which has hitherto been dominated by qualitative case study, although creativity and further research is needed to verify the findings. (shrink)