(Agency for Healthcare Research & Policy)
Free, on-line query system based on data from the Healthcare Cost and Utilization Project (HCUP). It provides access to health statistics and information on hospital inpatient and emergency department utilization.

(Agency for Healthcare Research & Policy)
Large-scale surveys & data on families and individuals, medical providers & employers on the cost and use of health care and health insurance.

(Centers Medicare & Medicaid)

(Centers for Disease Control and Prevention)

(Centers for Disease Control and Prevention)

(United States Census Bureau)

(Henry J. Kaiser Family Foundation)
Includes data on managed care enrollment, state consumer protection laws, and high risk pools.