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Reports of Lyme Disease in New Castle County, Delaware

Browse Lyme data by state

6,456

Confirmed cases of Lyme disease in New Castle County (2000 to 2020).

Ranked #1 of 3 counties in Delaware. That's 55% of Delaware's 11,734 confirmed cases.

Yearly Breakdown of Lyme Cases in New Castle County

Confirmed cases reported to the CDC each year.
View as a table
Confirmed Lyme disease cases in New Castle County by year
Year Confirmed cases
2000 121
2001 102
2002 132
2003 128
2004 105
2005 312
2006 285
2007 441
2008 519
2009 622
2010 396
2011 552
2012 398
2013 299
2014 259
2015 283
2016 269
2017 312
2018 285
2019 407
2020 229
2000–2020
Confirmed cases
    New Castle County

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    Lyme Stats for Other Delaware Counties

    Confirmed Lyme disease cases by county in Delaware, 2000 to 2020
    County Confirmed cases Share of state
    New Castle County 6,456 55.0%
    Kent County 1,959 16.7%
    Sussex County 1,827 15.6%
    Unknown County 1,492 12.7%

    "Unknown County" counts cases the CDC confirmed in Delaware without a county of residence. They are included in the state total but not on the map.

    Data Sources

    All Lyme disease prevalence data sourced from the Centers for Disease Control and Prevention's surveillance data. Cases are counted by the patient's county of residence, which may not be where the tick bite occurred.

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