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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.
Connecticut has the highest published established tick records in this comparison, at 100.0%. The next states shown are District of Columbia (100.0%) and Delaware (100.0%).
The table orders 49 states by cdc counties with established tick populations. It describes one published measure, not an overall judgment about where to live.
Use the result as a starting point, then compare the underlying source, dates, and local county figures before making a decision. 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.
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.
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