The Population Association of America and Association of Population Centers are two affiliated scientific societies that together represent over 3,000 population scientists (demographers, economists, sociologists) and the over 40 federally funded population research centers based at U.S. universities and research institutions. Population scientists conduct applied and scientific research on the causes and consequences of population change. Our field depends directly on research support from the NIH and NSF and indirectly on data produced by the federal statistical agencies to conduct their research and research training. Our comments reflect our field's support for enhancing the quality and accessibility of data and measures regarding health disparities. Our comments also reflect ways in which the population sciences can help advance NICHD's health disparities research agenda overall.