A field guide, state by state
Each state guide leads with the dominant species, the diseases the state actually surveils, and the local action path — what to do, who to call, where to send a tick if your state runs an ID program. We publish a state only after a signed §13a State Data Row exists; high-incidence states ship first.
Published
26 of 51 live- Arkansas ARLone star tick Ehrlichiosis / alpha-gal
Lone-star-dominant; major alpha-gal syndrome and ehrlichiosis exposure. Heartland/Bourbon virus on the regional watch list.
Open guide → - California CAWestern blacklegged tick Lyme disease
Wet-season pattern (winter adults, spring nymphs); oak-woodland leaf litter drives risk. Pacific Coast tick fever is a CA-unique angle.
Open guide → - Connecticut CTBlacklegged tick Lyme disease
Lyme disease is literally named for Old Lyme, CT. Among the highest U.S. per-capita Lyme incidence; CAES Tick Office runs longest-standing state tick-ID program.
Open guide → - Florida FLLone star tick Rocky Mountain spotted fever
Year-round activity statewide. Brown dog tick drives South Florida RMSF clusters; lone star puts FL in the AGS watch zone.
Open guide → - Georgia GALone star tick Alpha-gal syndrome
In the documented AGS high-incidence cluster. Major lone star territory; CDC HQ in Atlanta is a GA-relevant editorial signal.
Open guide → - Illinois ILAmerican dog tick Lyme disease
Blacklegged tick expanding northward; lone star established in central + southern counties. INHS runs ongoing tick surveillance.
Open guide → - Indiana INAmerican dog tick Ehrlichiosis
Active multi-tick frontier — northern + southern IN lead Lyme; lone star + blacklegged both expanding.
Open guide → - Maine MEBlacklegged tick Lyme disease
Among the highest U.S. per-capita Lyme + notable Powassan. Northern edge of U.S. lone star expansion. Maine CDC publishes detailed surveillance.
Open guide → - Maryland MDBlacklegged tick Lyme disease
High Lyme in central + western counties. In the documented AGS high-incidence cluster (lone star territory).
Open guide → - Massachusetts MABlacklegged tick Babesiosis
Cape + Islands historically among the U.S. babesiosis epicenters. UMass TickReport runs widely-used paid tick-testing.
Open guide → - Michigan MIBlacklegged tick Lyme disease
MDHHS-confirmed Lyme expansion in the western Lower Peninsula; nymph peak May–July.
Open guide → - Minnesota MNBlacklegged tick Lyme disease
High-incidence Lyme state; Borrelia mayonii is the Upper Midwest moat fact.
Open guide → - Missouri MOLone star tick Alpha-gal syndrome
Documented alpha-gal high-incidence cluster; lone star dominates April–August.
Open guide → - New Hampshire NHBlacklegged tick Lyme disease
Among the highest per-capita Lyme states; anaplasmosis and babesiosis also high. UNH Extension supports tick ID + surveillance.
Open guide → - New Jersey NJBlacklegged tick Lyme disease
Top-5 Lyme per-capita nationally. Early U.S. detection state for Asian longhorned tick (now established statewide).
Open guide → - New York NYBlacklegged tick Lyme disease
Among the highest Lyme-incidence states nationally; Hudson Valley + Long Island lead. Lone star expansion + AGS now watch items.
Open guide → - North Carolina NCLone star tick Rocky Mountain spotted fever
Among the highest U.S. RMSF case counts. U.S. discovery state for the Asian longhorned tick. AGS high-incidence cluster.
Open guide → - Ohio OHAmerican dog tick Lyme disease
Active Lyme + blacklegged expansion frontier. Eastern + southeastern OH leads; ODH publishes county-level data.
Open guide → - Pennsylvania PABlacklegged tick Lyme disease
Consistently leads U.S. Lyme case counts most years. Penn State Tick Lab partnership runs strong surveillance.
Open guide → - Rhode Island RIBlacklegged tick Lyme disease
Historically among the highest per-capita Lyme + babesiosis incidence in the U.S. URI TickEncounter is the national reference center.
Open guide → - Tennessee TNLone star tick Ehrlichiosis
Among the highest U.S. ehrlichiosis case counts. AGS high-incidence cluster. Lyme present in East TN mountains.
Open guide → - Texas TXLone star tick Rocky Mountain spotted fever
Lone star tick dominates statewide; major AGS watch state. Brown dog tick drives RMSF clusters in South Texas.
Open guide → - Vermont VTBlacklegged tick Lyme disease
Among the highest per-capita Lyme + anaplasmosis incidence; Powassan on the watch list. UVM Extension supports tick surveillance.
Open guide → - Virginia VABlacklegged tick Alpha-gal syndrome
Heart of the documented AGS high-incidence cluster (UVA research is central). Lyme + RMSF + ehrlichiosis all present.
Open guide → - Washington WARocky Mountain wood tick Rocky Mountain spotted fever
Cascades-divide state: east of Cascades = RM wood tick + RMSF + CTF; west = western blacklegged + Lyme. Two ecologies, one state.
Open guide → - Wisconsin WIBlacklegged tick Lyme disease
High Lyme + Powassan incidence; Borrelia mayonii exposure documented alongside Minnesota.
Open guide →
Coming soon
25 remaining · grouped by regionWe publish in order of tick burden + reader demand. If your state isn't here yet, the interactive map on the homepage shows what's known regionally. Want to nominate your state? Tell us.