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The most tornado-dense county in every state

Pinellas County, Florida, has the highest density on this list, with 551.5 tornadoes per 1,000 square miles since 1950. In 41 states the densest county is not the one with the highest count.

The densest counties

Only counties of 100 square miles or more, so that one tornado in a tiny county does not lead a state.

Tornadoes per 1,000 square miles, densest county in each of the top 12 states

Tornadoes per 1,000 square miles, densest county in each of the top 12 states Florida: 551.5 per 1,000 sq mi 551.5 Texas: 332.1 per 1,000 sq mi 332.1 Louisiana: 232.6 per 1,000 sq mi 232.6 Oklahoma: 204.1 per 1,000 sq mi 204.1 North Caroli: 171.7 per 1,000 sq mi 171.7 Colorado: 166.3 per 1,000 sq mi 166.3 Mississippi: 156.9 per 1,000 sq mi 156.9 Indiana: 154.2 per 1,000 sq mi 154.2 Iowa: 148.4 per 1,000 sq mi 148.4 Nebraska: 144.6 per 1,000 sq mi 144.6 Alabama: 142.0 per 1,000 sq mi 142.0 Illinois: 140.3 per 1,000 sq mi 140.3 FloridaTexasLouisianaOklahomaNorth CaroliColoradoMississippiIndianaIowaNebraskaAlabamaIllinois
Densest and highest-count county by state
FloridaPinellas County551.5151Palm Beach County199
TexasGalveston County332.1126Harris County253
LouisianaJefferson Parish232.670Calcasieu Parish113
OklahomaCleveland County204.1110Oklahoma County138
North CarolinaNew Hanover County171.733Carteret County81
ColoradoAdams County166.3194Weld County300
MississippiHarrison County156.990Hinds County125
IndianaVanderburgh County154.236Tippecanoe County58
IowaScott County148.468Polk County70
NebraskaHall County144.679Custer County111
AlabamaLimestone County142.080Mobile County123
IllinoisDuPage County140.346McLean County122
New JerseyUnion County136.214Burlington County25
ArkansasPulaski County133.2101Pulaski County101
GeorgiaSpalding County127.625Colquitt County42
TennesseeTrousdale County122.514Shelby County56
KansasBarton County119.5107Ford County114
KentuckyCalloway County116.945Christian County58
MissouriScott County116.749Greene County58
WisconsinGreen Lake County114.440Dane County78
South DakotaLincoln County103.960Brown County86
OhioVan Wert County97.840Franklin County41
MinnesotaFreeborn County97.669Otter Tail County89
MarylandSt. Mary's County94.834Frederick County38
VirginiaYork County86.09Loudoun County30
PennsylvaniaPhiladelphia County81.911Westmoreland County50
MichiganGenesee County80.151Genesee County51
South CarolinaCalhoun County70.827Orangeburg County76
DelawareNew Castle County65.728New Castle County28
North DakotaGrand Forks County64.893Cass County108
WyomingLaramie County47.3127Laramie County127
New YorkQueens County46.05Oneida County33
West VirginiaBerkeley County43.614Kanawha County15
ConnecticutLitchfield County41.338Litchfield County38
New MexicoCurry County40.657Lea County96
CaliforniaOrange County40.432Los Angeles County49
MassachusettsNorfolk County37.915Worcester County54
UtahDavis County36.912Salt Lake County13
HawaiiHonolulu County35.021Honolulu County21
New HampshireBelknap County29.912Hillsborough County20
Rhode IslandProvidence County29.312Providence County12
WashingtonClark County23.915Spokane County16
IdahoJefferson County17.419Bingham County20
MaineCumberland County15.513Aroostook County30
OregonMultnomah County13.96Marion County11
VermontFranklin County12.78Franklin County8
MontanaJudith Basin County9.618Valley County44
ArizonaMaricopa County8.275Maricopa County75
NevadaCarson City6.91Elko County23
AlaskaAnchorage Municipality0.61Bethel Census Area2