Geographic Distribution of Tickborne Disease Cases

At a glance

Reported cases of selected tickborne diseases by county of residence in the United States.

Map of the U.S. with dots in different colors showing reported cases of select tickborne diseases

Data dashboard

Dashboard data files

Notes on tickborne disease surveillance data:

  • Cases are reported from the patient's county of residence, not necessarily the place where they were infected by or exposed to ticks. Cases are not included in this list if county of residence was not reported.
  • Many high incidence states have modified surveillance practices that have led to notable decreases in case counts over time. Consequently, these data may not accurately represent disease trends in those areas.
  • Not all diseases are reportable from every jurisdiction in every year. For more information, see Annual Statistics from the National Notifiable Diseases Surveillance System (NNDSS) or contact your local health department.

Reported Tickborne Disease Cases by County of Residence 2019-2022.xlsx

To download a static map for the most recent years of data, click here.

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Content Source:
National Center for Emerging and Zoonotic Infectious Diseases (NCEZID)