Agency for Healthcare Research and Quality (AHRQ) - Federal agency charged with improving the safety and quality of America's health care system.
County Health Rankings - A joint effort of the Robert Wood Johnson Foundation and the University of Wisconsin Population Health Institute, this site ranks counties on various health factors within their states.
Morbidity and Mortality Weekly Report - From the Centers for Disease Control and Prevention (CDC).
National Center for Health Statistics - This division of the Centers for Disease Control and Prevention gathers statistics on all manner of health topics, from aging and birth rates to diseases and physical activity.
Statistical Abstract: Health & Nutrition - Statistics from the U.S. Census Bureau that cover "health expenditures and insurance coverage, including Medicare and Medicaid, medical personnel, hospitals, nursing homes and other care facilities, injuries, diseases, disability status, nutritional intake of the population, and food consumption."
WISQARS (Web-based Injury Statistics Query and Reporting System) - Statistics from the CDC.
World Health Organization (WHO) Global Health Observatory (GHO) Data - Provides data and analyses on global health priorities.