Rankings · Health

Highest established tick records by state

CDC counties with established tick populations.

This measure has no better end. The order describes the states, it does not rank them — see the other direction.

CDC's cumulative county surveillance classification for selected tick species. Select a species: the U.S. map shows the population-weighted share living in counties classified as established, while county maps highlight those counties. “Established” means CDC has records of six or more ticks of one life stage, or more than one life stage, in a 12-month period. A county not highlighted is not classified as established; it does not mean ticks are absent. This is not a map of tick abundance, bite likelihood, disease prevalence, or personal risk. CDC advises preventing tick bites wherever you spend time outdoors.

  1. 1Connecticut100.0%
  2. 2District of Columbia100.0%
  3. 3Delaware100.0%
  4. 4Massachusetts100.0%
  5. 5Maine100.0%
  6. 6New Hampshire100.0%
  7. 7New Jersey100.0%
  8. 8New York100.0%
  9. 9Pennsylvania100.0%
  10. 10Rhode Island100.0%
  11. 11Vermont100.0%
  12. 12Indiana98.8%
  13. 13Minnesota94.0%
  14. 14West Virginia92.4%
  15. 15Ohio92.3%
  16. 16Illinois89.9%
  17. 17Maryland89.7%
  18. 18Wisconsin85.5%
  19. 19Michigan85.2%
  20. 20Florida82.1%
  21. 21Iowa74.5%
  22. 22Oklahoma69.6%
  23. 23Virginia68.7%
  24. 24North Carolina63.4%
  25. 25Tennessee59.7%
  26. 26Alabama59.0%
  27. 27Mississippi55.2%
  28. 28Arkansas52.6%
  29. 29South Carolina45.3%
  30. 30Kentucky40.4%
  31. 31Nebraska40.2%
  32. 32Texas32.6%
  33. 33Kansas31.5%
  34. 34Missouri23.9%
  35. 35Louisiana16.9%
  36. 36Georgia15.8%
  37. 37North Dakota14.8%
  38. 38South Dakota11.9%
  39. 39Arizona0.0%
  40. 40California0.0%
  41. 41Colorado0.0%
  42. 42Idaho0.0%
  43. 43Montana0.0%
  44. 44New Mexico0.0%
  45. 45Nevada0.0%
  46. 46Oregon0.0%
  47. 47Utah0.0%
  48. 48Washington0.0%
  49. 49Wyoming0.0%

Not ranked, because this measure is not published for them: Alaska, Hawaii. CDC's current county classification table covers the contiguous U.S. and DC. Alaska and Hawaii are unavailable, not treated as no tick records.

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Frequently asked questions

What does this ranking show?
It orders states by CDC counties with established tick populations. It is one measure, not an overall verdict on where to live.
Where do the figures come from?
CDC Tick Surveillance. States without a comparable published figure are listed as not ranked rather than estimated.
How should I use it?
Use it to narrow your search, then open a state or county profile for the source date, caveats and local context.
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Free to use. The chart names its source and links back, so it stays honest wherever it ends up.

<iframe src="https://movermath.com/embed/established-tick-records" width="100%" height="420" style="border:0" loading="lazy" title="CDC counties with established tick populations by state"></iframe>

Source: CDC Tick Surveillance. · How this is built