"The Amish are one of the fastest-growing religious groups in America."
According to a study by Ohio State researchers, the Amish population in the United States doubles every 21 to 22 years, due in part to the likelihood of Amish people to remain within the community and continue to practice their religious beliefs as they start their own families. According to the study, there are a little over 250,000 Amish people in the U.S. and Canada, spread across 456 communities (up from 179 communities in 1990). The study also suggested that, within the next 15 years, some counties in the U.S. may be predominantly Amish (the study's author indicated Holmes County, Ohio, as the likeliest candidate).