The latest study by the National Institutes of Health to determine the prevalence of Celiac Disease in the United States has put it at 1 in 141 people. However, researchers caution that even though public awareness is growing many, cases remain undiagnosed.
The disease is currently more active in the non-Hispanic white population, which could be due to larger awareness and more access to health care. A biopsy of the small intestine was only performed in 43% of patients, which is relatively low.
Read more about Celiac in America from the NIH here: http://www.celiac.nih.gov/