According to the Hartford Institute for Religion Research which has several statistics regarding United States church sizes as measured by attendance. http://hirr.hartsem.edu/research/fastfacts/fast_facts.html#sizecong Approximate Distribution of U.S. Protestant and Other Christian Churches by size (excluding Catholic/Orthodox) ATTENDANCE # OF CHURCHES WEEKLY WORSHIPERS PERCENT 7-99 177,000 9 million 59% 100-499 105,000 25 million 35% 500-999 12,000 9 [...]