Agriculture Research Integrity Act of 201 9 This bill reaffirms that the Agricultural Research Service, the Economic Research Service, the National Agricultural Statistics Service, the National Institute of Food and Agriculture, and any successor agencies must be (1) within the research, education, and economics mission area of the Department of Agriculture (USDA); and (2) administered by the USDA Under Secretary for Research, Education, and Economics. The headquarters and the majority of the staff of the Economic Research Service and the National Institute of Food and Agriculture must be located within the National Capital Region.