Health 201 · Data Catalog Public health data · 2026-08-09

← All sources

CDC WONDER

CDC / NCHS

Source homepage API endpoint Documentation

Access tierOPEN-API Queryable API, automatable end to end.
Access methodREST API
AuthenticationNone
RegionUnited States
Topicsmortality natality cancer vaers population
Finest geographynational-state
Update cadenceannual
How we check freshnessmetadata request; compare data vintage string
Statusverified · last checked 2026-08-08
Registry idcdc-wonder

Quirks & gotchas

XML POST only; must send accept_datause_restrictions=true. API BLOCKS geographic subsetting (state/county) — sub-national needs NVSS files or data.cdc.gov provisional series. Cells <10 deaths suppressed.

Related sources on the same topics

NVSS Mortality/Natality Public Use Files
CDC / NCHS
SEER
NCI
WHO Global Health Observatory
WHO
DHS Program (Demographic & Health Surveys)
ICF
Human Mortality Database
UC Berkeley / MPIDR / INED
US Cancer Statistics / NPCR
CDC + NCI

Provenance

Catalog contents: 114 public health data sources
Source of record: registry/sources.yaml in the HealthDataWhiz repository
Built: 2026-08-09
Machine-readable: catalog.json (CC-BY, reuse freely)
This entry: cdc-wonder in registry/sources.yaml
Last verified: 2026-08-08

This catalog describes where public health data lives and how to access it. It is not medical advice, and it does not host or redistribute the data itself — always read each source's own documentation, licence, and suppression rules before using it. Access details drift; entries carry the date we last verified them. Sources marked RESTRICTED are listed for reference only — they require an application or data-use agreement and we never automate access to them.