The Committee on National Statistics held a 2-day public workshop on estimating the prevalence of human trafficking in the United States on April 8-9, 2019. The workshop explored current and innovative sampling methods, technological approaches, and analytical strategies for estimating the prevalence of sex and labor trafficking in vulnerable populations. The workshop, sponsored by the Office on Women’s Health at the Department of Health and Human Services (DHHS), brought together statisticians, survey methodologists, researchers, public health practitioners, and other experts who work closely with human trafficking data or with the survivors of trafficking.