Notifiable diseases are diseases "that, by law, must be reported to public health authorities upon diagnosis." The CDC maintains a revised list of nationally notifiable diseases but reporting by states is voluntary. Currently, reporting notifiable diseases is mandatory by most states.
Nationally Notifiable Infectious Diseases
A list from the CDC.
Summary of Notifiable Diseases
Annual publication from Morbidity and Mortality Weekly Report.
Access is also available from the CDC Nationally Notifiable Infectious Diseases website, which includes a list of Graphs and Maps from each report.
Disease Control Priorities Project
"The Disease Control Priorities Project (DCPP) is an ongoing effort to assess disease control priorities and produce evidence-based analysis and resource materials to inform health policymaking in developing countries."
Global Burden of Disease
The World Health Organization provides information and statistics.