Cumulative tick-borne disease load
Top-100 counties
The 100 U.S. counties with the highest cumulative CDC-reported tick-borne disease cases. We frame this as epidemiology, not stigma — high-load counties are places with higher tick density and reporting completeness, not worse places to live.
Hotspots
100 counties| Rank | County | State | Total cases | Diseases | Latest year |
|---|
| 01 | Dutchess County | NY | 15,008 | 8 | 2023 |
| 02 | Chester County | PA | 14,112 | 8 | 2023 |
| 03 | Suffolk County | NY | 13,363 | 8 | 2023 |
| 04 | Middlesex County | MA | 11,385 | 8 | 2023 |
| 05 | Morris County | NJ | 10,965 | 8 | 2023 |
| 06 | Bucks County | PA | 10,822 | 8 | 2023 |
| 07 | Montgomery County | PA | 10,457 | 8 | 2023 |
| 08 | Fairfield County | CT | 10,429 | 8 | 2023 |
| 09 | Orange County | NY | 9,255 | 8 | 2023 |
| 10 | Plymouth County | MA | 9,122 | 8 | 2023 |
| 11 | Columbia County | NY | 8,876 | 8 | 2023 |
| 12 | Monmouth County | NJ | 8,642 | 8 | 2023 |
| 13 | Hunterdon County | NJ | 8,523 | 8 | 2023 |
| 14 | New York County | NY | 7,979 | 8 | 2023 |
| 15 | Ulster County | NY | 7,965 | 8 | 2023 |
| 16 | Westchester County | NY | 7,844 | 8 | 2023 |
| 17 | Worcester County | MA | 7,771 | 8 | 2023 |
| 18 | Bristol County | MA | 7,681 | 8 | 2023 |
| 19 | New London County | CT | 7,666 | 8 | 2023 |
| 20 | Sussex County | NJ | 7,416 | 8 | 2023 |
| 21 | York County | PA | 7,342 | 8 | 2023 |
| 22 | Rockingham County | NH | 7,189 | 8 | 2023 |
| 23 | New Haven County | CT | 6,939 | 8 | 2023 |
| 24 | New Castle County | DE | 6,872 | 8 | 2023 |
| 25 | Norfolk County | MA | 6,849 | 8 | 2023 |
| 26 | Rensselaer County | NY | 6,791 | 8 | 2023 |
| 27 | Providence County | RI | 6,758 | 8 | 2023 |
| 28 | Washington County | RI | 6,574 | 8 | 2023 |
| 29 | Hillsborough County | NH | 6,331 | 8 | 2023 |
| 30 | Kings County | NY | 6,129 | 8 | 2023 |
| 31 | Albany County | NY | 5,949 | 8 | 2023 |
| 32 | Essex County | MA | 5,818 | 8 | 2023 |
| 33 | Ocean County | NJ | 5,647 | 8 | 2023 |
| 34 | Cumberland County | ME | 5,620 | 8 | 2023 |
| 35 | Butler County | PA | 5,580 | 8 | 2023 |
| 36 | Berks County | PA | 5,521 | 8 | 2023 |
| 37 | Warren County | NJ | 5,475 | 8 | 2023 |
| 38 | Litchfield County | CT | 5,293 | 8 | 2023 |
| 39 | Bergen County | NJ | 5,032 | 8 | 2023 |
| 40 | York County | ME | 4,906 | 8 | 2023 |
| 41 | Barnstable County | MA | 4,788 | 8 | 2023 |
| 42 | Allegheny County | PA | 4,723 | 8 | 2023 |
| 43 | Somerset County | NJ | 4,711 | 8 | 2023 |
| 44 | Lancaster County | PA | 4,688 | 8 | 2023 |
| 45 | Burlington County | NJ | 4,671 | 8 | 2023 |
| 46 | Hennepin County | MN | 4,660 | 8 | 2023 |
| 47 | Hartford County | CT | 4,600 | 8 | 2023 |
| 48 | Delaware County | PA | 4,552 | 8 | 2023 |
| 49 | Westmoreland County | PA | 4,536 | 8 | 2023 |
| 50 | Mercer County | NJ | 4,424 | 8 | 2023 |
| 51 | Rockland County | NY | 4,181 | 8 | 2023 |
| 52 | Windham County | CT | 4,161 | 8 | 2023 |
| 53 | Montgomery County | MD | 4,148 | 8 | 2023 |
| 54 | Putnam County | NY | 4,115 | 8 | 2023 |
| 55 | Middlesex County | NJ | 4,035 | 8 | 2023 |
| 56 | Philadelphia County | PA | 4,024 | 8 | 2023 |
| 57 | Tolland County | CT | 3,998 | 8 | 2023 |
| 58 | Saratoga County | NY | 3,854 | 8 | 2023 |
| 59 | Clearfield County | PA | 3,784 | 8 | 2023 |
| 60 | Greene County | NY | 3,762 | 8 | 2023 |
| 61 | Baltimore County | MD | 3,723 | 8 | 2023 |
| 62 | Loudoun County | VA | 3,610 | 8 | 2023 |
| 63 | Howard County | MD | 3,544 | 8 | 2023 |
| 64 | Lehigh County | PA | 3,536 | 8 | 2023 |
| 65 | Passaic County | NJ | 3,488 | 8 | 2023 |
| 66 | Kennebec County | ME | 3,262 | 8 | 2023 |
| 67 | Fairfax County | VA | 3,204 | 8 | 2023 |
| 68 | Northampton County | PA | 3,161 | 8 | 2023 |
| 69 | Middlesex County | CT | 3,144 | 8 | 2023 |
| 70 | Essex County | NJ | 3,070 | 8 | 2023 |
| 71 | Anne Arundel County | MD | 2,980 | 8 | 2023 |
| 72 | Kent County | RI | 2,975 | 8 | 2023 |
| 73 | Centre County | PA | 2,921 | 8 | 2023 |
| 74 | Dauphin County | PA | 2,859 | 8 | 2023 |
| 75 | Strafford County | NH | 2,845 | 8 | 2023 |
| 76 | Dane County | WI | 2,845 | 8 | 2023 |
| 77 | Berkshire County | MA | 2,812 | 8 | 2023 |
| 78 | Ramsey County | MN | 2,795 | 8 | 2023 |
| 79 | Carroll County | MD | 2,783 | 8 | 2023 |
| 80 | Knox County | ME | 2,747 | 8 | 2023 |
| 81 | Washington County | NY | 2,741 | 8 | 2023 |
| 82 | Atlantic County | NJ | 2,697 | 8 | 2023 |
| 83 | Hampden County | MA | 2,689 | 8 | 2023 |
| 84 | Gloucester County | NJ | 2,673 | 8 | 2023 |
| 85 | Bennington County | VT | 2,669 | 8 | 2023 |
| 86 | Anoka County | MN | 2,652 | 8 | 2023 |
| 87 | Frederick County | MD | 2,641 | 8 | 2023 |
| 88 | Queens County | NY | 2,617 | 8 | 2023 |
| 89 | Harford County | MD | 2,612 | 8 | 2023 |
| 90 | Cumberland County | PA | 2,605 | 8 | 2023 |
| 91 | Merrimack County | NH | 2,576 | 8 | 2023 |
| 92 | Hancock County | ME | 2,518 | 8 | 2023 |
| 93 | Nassau County | NY | 2,502 | 8 | 2023 |
| 94 | Jefferson County | PA | 2,491 | 8 | 2023 |
| 95 | Washington County | MN | 2,485 | 8 | 2023 |
| 96 | Crow Wing County | MN | 2,481 | 8 | 2023 |
| 97 | Marathon County | WI | 2,420 | 8 | 2023 |
| 98 | Rutland County | VT | 2,403 | 8 | 2023 |
| 99 | Armstrong County | PA | 2,320 | 8 | 2023 |
| 100 | Windsor County | VT | 2,282 | 8 | 2023 |