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The Commerce Department's website is the most appropriate starting point for research on census data because it oversees the U.S. Census Bureau, which is responsible for collecting and disseminating demographic, social, and economic data about the United States population. The Census Bureau provides a wealth of information through various surveys, including the decennial census and the American Community Survey. These resources are essential for understanding population characteristics, trends, and needs, which are crucial for public health planning and policy development.

Other options may provide valuable information but are not primarily focused on census data. The Department of Labor focuses on employment statistics and labor-related information. The United States Immunization Survey, while important for health statistics, is narrow in scope and does not cover the broad range of demographic data found in census research. The World Health Organization, as an international body, offers health-related data and resources but does not provide specific U.S. census data, making it less relevant for this particular need.