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Ticks in the US: Where to find them, what they can spread

Portrait of Mary Walrath-Holdridge Mary Walrath-Holdridge
Updated May 8, 2026, 5:12 p.m. ET
The blacklegged, or deer, tick is the most common species in the U.S. and is known to carry several diseases, including anaplasmosis, babesiosis, ehrlichiosis, Lyme disease, Borrelia miyamotoi disease and Powassan virus disease, according to the Mayo Clinic.
The blacklegged, or deer, tick is the most common species in the U.S. and is known to carry several diseases, including anaplasmosis, babesiosis, ehrlichiosis, Lyme disease, Borrelia miyamotoi disease and Powassan virus disease, according to the Mayo Clinic.
StevenEllingson, Getty Images/iStockphoto
The American dog tick, found mostly in the Rocky Mountains region, can spread Rocky Mountain spotted fever and tularemia, according to Mayo Clinic.
The American dog tick, found mostly in the Rocky Mountains region, can spread Rocky Mountain spotted fever and tularemia, according to Mayo Clinic.
DENNY SIMMONS / THE TENNESSEAN / USA TODAY NETWORK Via Imagn Images
The brown dog tick can be found across the United States and the world. It can carry Rocky Mountain spotted fever, according to Mayo Clinic
The brown dog tick can be found across the United States and the world. It can carry Rocky Mountain spotted fever, according to Mayo Clinic
Courtesy CDC
The Rocky Mountain wood tick can spread Colorado tick fever, Rocky Mountain spotted fever and tularemia, according to Mayo Clinic. It is found mostly in the U.S. Rocky Mountain states.
The Rocky Mountain wood tick can spread Colorado tick fever, Rocky Mountain spotted fever and tularemia, according to Mayo Clinic. It is found mostly in the U.S. Rocky Mountain states.
Milehightraveler, Getty Images/iStockphoto
The Asian longhorned tick wasn't found in the U.S. until 2017, though it has since spread to several states. It's usually found in countries including eastern China, Japan, the Russian Far East and the Korean Peninsula, according to Mayo Clinic. It can carry anaplasmosis, babesiosis, ehrlichiosis and rickettsiosis, though how its bites interact with humans is still largely unknown.
The Asian longhorned tick wasn't found in the U.S. until 2017, though it has since spread to several states. It's usually found in countries including eastern China, Japan, the Russian Far East and the Korean Peninsula, according to Mayo Clinic. It can carry anaplasmosis, babesiosis, ehrlichiosis and rickettsiosis, though how its bites interact with humans is still largely unknown.
Courtesy CDC
The Gulf Coast tick is found primarily in the southeastern United States, according to the CDC, and can spread form of spotted fever called Rickettsia parkeri rickettsiosis.
The Gulf Coast tick is found primarily in the southeastern United States, according to the CDC, and can spread form of spotted fever called Rickettsia parkeri rickettsiosis.
Courtesy CDC
The Western blacklegged tick lives, as it name suggests, mostly along the Pacific coast of the United States, particularly northern California, according to the CDC. It can carry anaplasmosis, babesiosis and Lyme disease.
The Western blacklegged tick lives, as it name suggests, mostly along the Pacific coast of the United States, particularly northern California, according to the CDC. It can carry anaplasmosis, babesiosis and Lyme disease.
Courtesy CDC
The Lone Star tick, found mostly in the Eastern and Southern U.S., can carry diseases including ehrlichiosis, heartland virus disease, southern tick-associated rash illness (STARI), Bourbon virus disease and tularemia, according to Mayo Clinic. Infamously, a bite can also cause alpha-gal syndrome, which can trigger a meat allergy.
The Lone Star tick, found mostly in the Eastern and Southern U.S., can carry diseases including ehrlichiosis, heartland virus disease, southern tick-associated rash illness (STARI), Bourbon virus disease and tularemia, according to Mayo Clinic. Infamously, a bite can also cause alpha-gal syndrome, which can trigger a meat allergy.
Courtesy CDC
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