CDC WONDER
Centers for Disease Control and Prevention
CDC's query system for national mortality, natality and population files. RepVector does not read it directly — here is what it holds and what we use instead.
Nothing in the platform queries CDC WONDER, and no RepVector output is derived from it. This page explains what it covers and points to the connected sources that come closest.
What this source is
CDC WONDER (Wide-ranging ONline Data for Epidemiologic Research) is a query front end over dozens of CDC collections: underlying and multiple cause of death, provisional mortality, natality, cancer incidence, population estimates and environmental exposure files.
Its most used files are the compressed mortality and multiple-cause-of-death tables, which let you count deaths by cause, age, race, sex, state and county for a chosen year range.
Results come back as counts, crude rates and age-adjusted rates, with confidence intervals on the rates.
Known limits
- Sub-national counts below ten are suppressed, so small counties return blanks rather than numbers for many causes.
- Rates based on small denominators are flagged as unreliable and should not be ranked against each other.
- Provisional files are revised for months after the period closes as death certificates are completed.
- WONDER has no public bulk API with stable terms for automated use, which is the practical reason RepVector does not query it.
What RepVector reads instead
These connected datasets cover the closest ground and are queried live in a RepVector build.
Common questions
Does RepVector use CDC WONDER?
RepVector does not read this source directly. Nothing in the platform queries it, and no RepVector output is derived from it. We read CDC's published mortality, leading-causes and provisional overdose files instead, which cover most of the same ground with terms that allow automated access.
Why are some CDC WONDER county numbers blank?
CDC suppresses sub-national counts below ten to protect confidentiality. A blank means the count is small, not zero.
Is CDC WONDER free?
Yes. It is a public CDC service with no account required for most files.
How current is CDC WONDER mortality data?
Final mortality files run roughly a year behind. Provisional mortality is refreshed monthly and revised as records are completed.
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