Useful Databases and Websites: CDC Wonder

CDCWhat is CDC Wonder?


The Centers for Disease Control and Prevention (CDC) has an online web portal of information resources called the Wide-ranging OnLine Data for Epidemiologic Research (WONDER) . Many of these resources have query tools that are easy to use and some of them provide data at the state level by county. Below is a list of those resources with online data query tools that you can access from the link above or directly from the links given below. Mortality (underlying cause of death) is the most complete data resource in the CDC Wonder Website for rural areas by state.

Additional information about WONDER is located at


Resources List

AIDS Public Information Data:

AIDS case counts are available for cases reported starting in January 1981 by various metropolitan areas or regional rural areas (i.e. Northeast, Midwest, South, or West). Rural information is not available at the state level.

Birth Data

Counts of births can be obtained for both the state and county of the mother's residence. However, county-level data are shown only for counties with populations of 100,000 persons or more. Data for all counties with fewer than 100,000 persons within a state are combined together under the label "Unidentified Counties." 
Infant Deaths

Counts of death of infants under 1 year of age are linked to birth records and are available at both the state and county level. However, counties with a total population of less than 250,000 are combined under “Unidentified Counties”

Mortality – Underlying Cause of Death

Here you will find county-level mortality data derived from death certificates starting in 1979. Both counts and rates of death can be obtained at both the state and county levels.

  • Once you click the link above, you can choose to look at mortality data from 1979 to 1998 using the ICD-9 codes or 1999 to 2004 using the ICD-10 codes.
  • After you select the years that you are interested in, you are taken to a new page with a set of tabs across the top. The first tab is the “Request Form” tab. This allows you to group your data by one or more of several useful variables (including county).  
  • Farther down the page you can also select “Urbanization”, this allows you to look only at those counties falling within one of the National Center for Health Statistics (NCHS) classifications of: Large Central Metro, Large Fringe Metro, Medium Metro, Small Metro, Micropolitan (non-metro), NonCore (non-metro).
  • Once you have chosen your variables, click once on any of the send buttons on the page to process the results requested. The data you requested is first provided in a table format. You can then click on the “Map” tab to provide a GIS colored map of the data, or the “Chart” tab to see bar graphs of the data.

National Program of Cancer Registries

This provides a link to Cancer incidence data at the state level. No rural information is available.

Population Data (from Census)

Both population estimates and projections are available through these links at both the state and the county level. These are similar to the queries available on the census website that is very useful for obtaining demographic data about rural residents. 

Online Tuberculosis Information System

Counts and rates of tuberculosis cases are available by state and MSA. No rural information is available.

Sexually Transmitted Disease Morbidity

Counts and rates of reportable sexually transmitted disease incidences by state are available. No rural information is available.

Vaccine Adverse Events Reporting

The counts of both primary and secondary adverse events associated with vaccinations are available at the state level. No rural information is available.

Additional Information

A full list with links to other available data sets and sources (but without the query tools) is available at .

There are also two other tabs available on the WONDER website. The first is called "Topics" and provides a link to a full list of topics with links to various web resources. The second is called "A to Z Index" and provides links alphabetically to various topics. Links which have data that are available for either download or online query are marked with an arrow on the left-hand side.

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