US counties by median Air Quality Index (US EPA), 2016

San Bernardino County 84, the highest of 1008 counties, 2016

Baldwin County: 40 indexClay County: 41 indexColbert County: 41 indexDeKalb County: 41 indexElmore County: 40 indexEtowah County: 58 indexHouston County: 37 indexJefferson County: 56 indexLawrence County: 33 indexMadison County: 42 indexMobile County: 51 indexMontgomery County: 48 indexMorgan County: 46 indexRussell County: 45 indexShelby County: 41 indexSumter County: 37 indexTalladega County: 46 indexTuscaloosa County: 54 indexAleutians East Borough: 11 indexAnchorage Municipality: 40 indexDenali Borough: 33 indexFairbanks North Star Borough: 46 indexJuneau City and Borough: 27 indexKenai Peninsula Borough: 9 indexMatanuska-Susitna Borough: 34 indexApache County: 14 indexCochise County: 44 indexCoconino County: 44 indexGila County: 44 indexLa Paz County: 42 indexMaricopa County: 67 indexMohave County: 19 indexNavajo County: 43 indexPima County: 50 indexPinal County: 69 indexSanta Cruz County: 48 indexYavapai County: 40 indexYuma County: 49 indexArkansas County: 44 indexAshley County: 45 indexClark County: 34 indexCrittenden County: 40 indexGarland County: 48 indexJackson County: 39 indexNewton County: 37 indexPolk County: 41 indexPulaski County: 52 indexUnion County: 47 indexWashington County: 40 indexAlameda County: 52 indexAlpine County: 29 indexAmador County: 37 indexButte County: 57 indexCalaveras County: 49 indexColusa County: 45 indexContra Costa County: 46 indexDel Norte County: 26 indexEl Dorado County: 45 indexFresno County: 76 indexGlenn County: 48 indexHumboldt County: 38 indexImperial County: 61 indexInyo County: 45 indexKern County: 80 indexKings County: 72 indexLake County: 33 indexLos Angeles County: 77 indexMadera County: 63 indexMarin County: 36 indexMariposa County: 48 indexMendocino County: 39 indexMerced County: 58 indexMono County: 18 indexMonterey County: 37 indexNapa County: 44 indexNevada County: 45 indexOrange County: 58 indexPlacer County: 50 indexPlumas County: 43 indexRiverside County: 83 indexSacramento County: 55 indexSan Benito County: 39 indexSan Bernardino County: 84 indexSan Diego County: 68 indexSan Francisco County: 41 indexSan Joaquin County: 60 indexSan Luis Obispo County: 55 indexSan Mateo County: 47 indexSanta Barbara County: 50 indexSanta Clara County: 50 indexSanta Cruz County: 35 indexShasta County: 41 indexSiskiyou County: 27 indexSolano County: 47 indexSonoma County: 34 indexStanislaus County: 59 indexSutter County: 58 indexTehama County: 45 indexTrinity County: 51 indexTulare County: 77 indexTuolumne County: 44 indexVentura County: 56 indexYolo County: 43 indexAdams County: 46 indexAlamosa County: 18 indexArapahoe County: 44 indexArchuleta County: 17 indexBoulder County: 39 indexChaffee County: 47 indexClear Creek County: 47 indexDelta County: 16 indexDenver County: 54 indexDouglas County: 44 indexEl Paso County: 46 indexFremont County: 14 indexGarfield County: 47 indexGrand County: 44 indexGunnison County: 44 indexJackson County: 8 indexJefferson County: 46 indexLa Plata County: 47 indexLarimer County: 51 indexMesa County: 47 indexMoffat County: 41 indexMontezuma County: 44 indexMontrose County: 40 indexPark County: 47 indexPitkin County: 12 indexProwers County: 17 indexPueblo County: 26 indexRio Blanco County: 44 indexRoutt County: 15 indexSan Juan County: 8 indexSan Miguel County: 44 indexWeld County: 49 indexKent County: 42 indexNew Castle County: 52 indexSussex County: 43 indexDistrict of Columbia: 53 indexAlachua County: 42 indexBaker County: 34 indexBay County: 43 indexBrevard County: 42 indexBroward County: 47 indexCitrus County: 45 indexCollier County: 43 indexColumbia County: 43 indexDuval County: 48 indexEscambia County: 44 indexFlagler County: 35 indexHamilton County: 44 indexHighlands County: 33 indexHillsborough County: 51 indexHolmes County: 46 indexIndian River County: 39 indexLake County: 37 indexLee County: 42 indexLeon County: 48 indexLiberty County: 33 indexManatee County: 36 indexMarion County: 43 indexMartin County: 41 indexMiami-Dade County: 52 indexNassau County: 45 indexOkaloosa County: 36 indexOrange County: 47 indexOsceola County: 35 indexPalm Beach County: 47 indexPasco County: 37 indexPinellas County: 45 indexPolk County: 44 indexPutnam County: 14 indexSt. Lucie County: 37 indexSanta Rosa County: 43 indexSarasota County: 47 indexSeminole County: 38 indexVolusia County: 42 indexWakulla County: 41 indexBibb County: 50 indexCharlton County: 31 indexChatham County: 44 indexChattooga County: 42 indexClarke County: 44 indexClayton County: 46 indexCobb County: 50 indexCoffee County: 41 indexColumbia County: 40 indexCoweta County: 43 indexDawson County: 42 indexDeKalb County: 57 indexDougherty County: 48 indexDouglas County: 43 indexFloyd County: 49 indexFulton County: 55 indexGlynn County: 41 indexGwinnett County: 46 indexHall County: 40 indexHenry County: 44 indexHouston County: 44 indexLowndes County: 43 indexMurray County: 43 indexMuscogee County: 44 indexPaulding County: 52 indexPike County: 40 indexRichmond County: 46 indexRockdale County: 44 indexSumter County: 39 indexWalker County: 51 indexWashington County: 38 indexWilkinson County: 44 indexHawaii County: 66 indexHonolulu County: 32 indexKauai County: 17 indexMaui County: 28 indexAda County: 41 indexBannock County: 36 indexBenewah County: 43 indexBlaine County: 10 indexBoise County: 38 indexBonner County: 27 indexBonneville County: 35 indexButte County: 39 indexCanyon County: 50 indexCuster County: 11 indexFranklin County: 34 indexIdaho County: 39 indexJerome County: 17 indexKootenai County: 29 indexLatah County: 10 indexLemhi County: 51 indexNez Perce County: 31 indexShoshone County: 47 indexTwin Falls County: 22 indexValley County: 17 indexAdams County: 36 indexChampaign County: 43 indexClark County: 38 indexCook County: 56 indexDuPage County: 42 indexEffingham County: 39 indexHamilton County: 42 indexJersey County: 44 indexJo Daviess County: 33 indexKane County: 36 indexLake County: 34 indexMcHenry County: 44 indexMcLean County: 39 indexMacon County: 49 indexMacoupin County: 39 indexMadison County: 51 indexPeoria County: 48 indexRandolph County: 42 indexRock Island County: 34 indexSt. Clair County: 44 indexSangamon County: 36 indexWill County: 48 indexWinnebago County: 36 indexAllen County: 48 indexBartholomew County: 47 indexBoone County: 40 indexBrown County: 36 indexCarroll County: 39 indexClark County: 49 indexDelaware County: 42 indexDubois County: 44 indexElkhart County: 48 indexFloyd County: 44 indexGreene County: 42 indexHamilton County: 49 indexHendricks County: 40 indexHenry County: 37 indexHoward County: 48 indexHuntington County: 37 indexJackson County: 40 indexJohnson County: 38 indexKnox County: 35 indexLake County: 51 indexLaPorte County: 39 indexMadison County: 44 indexMarion County: 55 indexMonroe County: 34 indexMorgan County: 39 indexPerry County: 41 indexPorter County: 44 indexPosey County: 39 indexSt. Joseph County: 51 indexShelby County: 39 indexSpencer County: 43 indexTippecanoe County: 40 indexVanderburgh County: 47 indexVigo County: 51 indexWabash County: 35 indexWarrick County: 42 indexWhitley County: 40 indexBlack Hawk County: 51 indexBremer County: 33 indexCerro Gordo County: 15 indexClinton County: 57 indexDelaware County: 31 indexHarrison County: 37 indexJohnson County: 44 indexLee County: 42 indexLinn County: 47 indexMontgomery County: 44 indexMuscatine County: 49 indexPalo Alto County: 42 indexPolk County: 44 indexPottawattamie County: 36 indexScott County: 60 indexStory County: 35 indexVan Buren County: 51 indexWarren County: 33 indexWoodbury County: 36 indexChase County: 24 indexFord County: 16 indexJohnson County: 37 indexLeavenworth County: 35 indexNeosho County: 37 indexSedgwick County: 43 indexShawnee County: 37 indexSherman County: 20 indexSumner County: 38 indexTrego County: 39 indexWyandotte County: 47 indexBell County: 39 indexBoone County: 38 indexBoyd County: 51 indexBullitt County: 39 indexCampbell County: 52 indexCarter County: 38 indexChristian County: 41 indexDaviess County: 54 indexEdmonson County: 37 indexFayette County: 43 indexGreenup County: 37 indexHancock County: 39 indexHardin County: 52 indexHenderson County: 52 indexJefferson County: 54 indexJessamine County: 41 indexLivingston County: 39 indexMcCracken County: 53 indexMadison County: 39 indexMorgan County: 37 indexOldham County: 41 indexPerry County: 51 indexPike County: 49 indexPulaski County: 41 indexSimpson County: 40 indexTrigg County: 36 indexWarren County: 49 indexWashington County: 38 indexAscension Parish: 36 indexBossier Parish: 44 indexCaddo Parish: 38 indexCalcasieu Parish: 53 indexEast Baton Rouge Parish: 55 indexIberville Parish: 40 indexJefferson Parish: 42 indexLafayette Parish: 44 indexLafourche Parish: 39 indexLivingston Parish: 51 indexOrleans Parish: 51 indexOuachita Parish: 37 indexPointe Coupee Parish: 33 indexRapides Parish: 45 indexSt. Bernard Parish: 46 indexSt. James Parish: 31 indexSt. John the Baptist Parish: 35 indexSt. Martin Parish: 39 indexSt. Tammany Parish: 41 indexTangipahoa Parish: 37 indexTerrebonne Parish: 37 indexWest Baton Rouge Parish: 47 indexAndroscoggin County: 35 indexAroostook County: 39 indexCumberland County: 39 indexFranklin County: 21 indexHancock County: 38 indexKennebec County: 31 indexKnox County: 33 indexOxford County: 35 indexPenobscot County: 42 indexWashington County: 32 indexYork County: 38 indexAnne Arundel County: 44 indexBaltimore County: 48 indexCalvert County: 42 indexCarroll County: 42 indexCecil County: 47 indexCharles County: 42 indexDorchester County: 45 indexFrederick County: 43 indexGarrett County: 42 indexHarford County: 48 indexHoward County: 48 indexKent County: 42 indexMontgomery County: 42 indexPrince George's County: 48 indexWashington County: 47 indexBaltimore city: 49 indexBarnstable County: 36 indexBerkshire County: 36 indexBristol County: 37 indexDukes County: 36 indexEssex County: 39 indexFranklin County: 38 indexHampden County: 41 indexHampshire County: 38 indexMiddlesex County: 33 indexNorfolk County: 37 indexPlymouth County: 39 indexSuffolk County: 51 indexWorcester County: 41 indexAllegan County: 43 indexBay County: 37 indexBenzie County: 38 indexBerrien County: 43 indexCass County: 42 indexChippewa County: 37 indexClinton County: 41 indexGenesee County: 42 indexHuron County: 38 indexIngham County: 43 indexKalamazoo County: 44 indexKent County: 46 indexKeweenaw County: 12 indexLenawee County: 44 indexMacomb County: 44 indexManistee County: 34 indexMason County: 38 indexMissaukee County: 38 indexMonroe County: 41 indexMuskegon County: 41 indexOakland County: 43 indexOttawa County: 41 indexSt. Clair County: 43 indexSchoolcraft County: 32 indexTuscola County: 34 indexWashtenaw County: 44 indexWayne County: 57 indexWexford County: 34 indexAnoka County: 38 indexBecker County: 29 indexBeltrami County: 24 indexCarlton County: 31 indexCook County: 18 indexCrow Wing County: 34 indexDakota County: 34 indexGoodhue County: 34 indexHennepin County: 48 indexLake County: 24 indexLyon County: 32 indexMille Lacs County: 30 indexOlmsted County: 37 indexRamsey County: 38 indexSt. Louis County: 34 indexScott County: 32 indexStearns County: 33 indexWashington County: 36 indexWinona County: 19 indexWright County: 36 indexBolivar County: 39 indexDeSoto County: 47 indexForrest County: 46 indexGrenada County: 41 indexHancock County: 40 indexHarrison County: 44 indexHinds County: 52 indexJackson County: 39 indexLauderdale County: 37 indexLee County: 39 indexYalobusha County: 33 indexAndrew County: 40 indexBoone County: 37 indexBuchanan County: 44 indexCallaway County: 38 indexCass County: 39 indexCedar County: 41 indexClay County: 41 indexClinton County: 42 indexGreene County: 42 indexJackson County: 47 indexJasper County: 34 indexJefferson County: 46 indexLincoln County: 39 indexMonroe County: 32 indexPerry County: 42 indexSt. Charles County: 44 indexSte. Genevieve County: 39 indexSt. Louis County: 48 indexStoddard County: 32 indexTaney County: 37 indexSt. Louis city: 53 indexCascade County: 33 indexFergus County: 36 indexFlathead County: 37 indexGallatin County: 32 indexLake County: 8 indexLewis and Clark County: 42 indexLincoln County: 44 indexMissoula County: 58 indexPhillips County: 34 indexPowder River County: 39 indexPowell County: 10 indexRavalli County: 34 indexRichland County: 37 indexRoosevelt County: 13 indexRosebud County: 38 indexSanders County: 12 indexSheridan County: 15 indexSilver Bow County: 29 indexYellowstone County: 31 indexCass County: 22 indexDawson County: 14 indexDouglas County: 45 indexHall County: 29 indexKnox County: 35 indexLancaster County: 37 indexSarpy County: 42 indexScotts Bluff County: 26 indexThomas County: 14 indexWashington County: 32 indexChurchill County: 41 indexClark County: 61 indexDouglas County: 34 indexElko County: 20 indexLyon County: 41 indexNye County: 15 indexWashoe County: 49 indexWhite Pine County: 43 indexCarson City: 43 indexBelknap County: 35 indexCheshire County: 37 indexCoos County: 44 indexGrafton County: 36 indexHillsborough County: 37 indexMerrimack County: 31 indexRockingham County: 41 indexAtlantic County: 41 indexBergen County: 47 indexCamden County: 52 indexCumberland County: 44 indexEssex County: 46 indexGloucester County: 42 indexHudson County: 49 indexHunterdon County: 43 indexMercer County: 48 indexMiddlesex County: 45 indexMonmouth County: 37 indexMorris County: 35 indexOcean County: 40 indexPassaic County: 41 indexUnion County: 52 indexWarren County: 48 indexBernalillo County: 52 indexCatron County: 12 indexChaves County: 22 indexDoña Ana County: 56 indexEddy County: 44 indexLea County: 42 indexLincoln County: 13 indexLos Alamos County: 11 indexLuna County: 17 indexRio Arriba County: 44 indexSandoval County: 42 indexSan Juan County: 44 indexSanta Fe County: 43 indexSocorro County: 15 indexTaos County: 16 indexValencia County: 43 indexAlbany County: 39 indexBronx County: 45 indexChautauqua County: 37 indexDutchess County: 34 indexErie County: 47 indexEssex County: 39 indexFranklin County: 21 indexHamilton County: 34 indexHerkimer County: 32 indexJefferson County: 34 indexKings County: 38 indexMonroe County: 43 indexNassau County: 30 indexNew York County: 52 indexNiagara County: 39 indexOneida County: 27 indexOnondaga County: 36 indexOrange County: 38 indexOswego County: 34 indexPutnam County: 35 indexQueens County: 44 indexRichmond County: 45 indexRockland County: 39 indexSaratoga County: 33 indexSteuben County: 37 indexSuffolk County: 43 indexTompkins County: 36 indexWayne County: 34 indexWestchester County: 40 indexAlexander County: 39 indexAvery County: 42 indexBuncombe County: 43 indexCaldwell County: 43 indexCarteret County: 36 indexCaswell County: 33 indexCatawba County: 48 indexCumberland County: 46 indexDavidson County: 47 indexDurham County: 49 indexEdgecombe County: 40 indexForsyth County: 47 indexGraham County: 45 indexGranville County: 41 indexGuilford County: 48 indexHaywood County: 44 indexHyde County: 26 indexJackson County: 48 indexJohnston County: 44 indexLee County: 48 indexLenoir County: 40 indexLincoln County: 44 indexMacon County: 35 indexMartin County: 36 indexMecklenburg County: 50 indexMitchell County: 37 indexMontgomery County: 41 indexNew Hanover County: 35 indexPerson County: 40 indexPitt County: 42 indexRockingham County: 42 indexRowan County: 37 indexSwain County: 44 indexUnion County: 44 indexWake County: 53 indexYancey County: 46 indexBillings County: 35 indexBurke County: 33 indexBurleigh County: 31 indexCass County: 37 indexDunn County: 35 indexMcKenzie County: 33 indexMercer County: 32 indexOliver County: 33 indexStutsman County: 8 indexWilliams County: 32 indexAdams County: 31 indexAllen County: 37 indexAshtabula County: 41 indexAthens County: 36 indexBelmont County: 17 indexButler County: 44 indexClark County: 48 indexClermont County: 52 indexClinton County: 44 indexColumbiana County: 15 indexCuyahoga County: 54 indexDelaware County: 41 indexFayette County: 37 indexFranklin County: 46 indexGeauga County: 44 indexGreene County: 44 indexHamilton County: 55 indexJefferson County: 56 indexKnox County: 41 indexLake County: 44 indexLawrence County: 46 indexLicking County: 43 indexLorain County: 37 indexLucas County: 46 indexMadison County: 43 indexMahoning County: 45 indexMedina County: 44 indexMiami County: 43 indexMontgomery County: 46 indexNoble County: 39 indexPortage County: 38 indexPreble County: 43 indexScioto County: 15 indexStark County: 45 indexSummit County: 52 indexTrumbull County: 42 indexWarren County: 50 indexWashington County: 40 indexWood County: 41 indexAdair County: 43 indexCaddo County: 33 indexCanadian County: 36 indexCarter County: 42 indexCherokee County: 38 indexCleveland County: 44 indexComanche County: 42 indexCotton County: 39 indexCreek County: 39 indexCuster County: 15 indexDewey County: 42 indexGrady County: 9 indexJohnston County: 39 indexKay County: 52 indexLincoln County: 39 indexMcClain County: 37 indexMayes County: 38 indexMuskogee County: 17 indexOklahoma County: 46 indexOsage County: 38 indexOttawa County: 47 indexPittsburg County: 43 indexSequoyah County: 38 indexTulsa County: 52 indexWashington County: 45 indexBaker County: 28 indexBenton County: 20 indexClackamas County: 29 indexColumbia County: 26 indexCrook County: 26 indexDeschutes County: 29 indexDouglas County: 23 indexGrant County: 29 indexHarney County: 24 indexJackson County: 41 indexJosephine County: 38 indexKlamath County: 41 indexLake County: 24 indexLane County: 39 indexLinn County: 26 indexMarion County: 33 indexMultnomah County: 33 indexUmatilla County: 35 indexUnion County: 24 indexWallowa County: 23 indexWasco County: 34 indexWashington County: 35 indexAdams County: 44 indexAllegheny County: 56 indexArmstrong County: 53 indexBeaver County: 52 indexBerks County: 54 indexBlair County: 44 indexBradford County: 43 indexBucks County: 34 indexCambria County: 46 indexCentre County: 45 indexChester County: 52 indexClearfield County: 38 indexCumberland County: 51 indexDauphin County: 50 indexDelaware County: 55 indexElk County: 37 indexErie County: 44 indexFranklin County: 33 indexGreene County: 39 indexIndiana County: 38 indexLackawanna County: 45 indexLancaster County: 56 indexLawrence County: 33 indexLebanon County: 55 indexLehigh County: 52 indexLuzerne County: 34 indexLycoming County: 34 indexMercer County: 48 indexMonroe County: 43 indexMontgomery County: 34 indexNorthampton County: 53 indexPhiladelphia County: 55 indexSomerset County: 36 indexTioga County: 41 indexWashington County: 55 indexWestmoreland County: 53 indexYork County: 51 indexKent County: 35 indexProvidence County: 49 indexWashington County: 38 indexAbbeville County: 39 indexAiken County: 40 indexAnderson County: 41 indexBerkeley County: 34 indexCharleston County: 44 indexCherokee County: 41 indexChesterfield County: 42 indexColleton County: 39 indexDarlington County: 39 indexEdgefield County: 45 indexFlorence County: 41 indexGeorgetown County: 16 indexGreenville County: 50 indexHorry County: 26 indexLexington County: 47 indexOconee County: 43 indexPickens County: 44 indexRichland County: 48 indexSpartanburg County: 52 indexYork County: 39 indexBrookings County: 35 indexBrown County: 26 indexCodington County: 28 indexCuster County: 39 indexHughes County: 22 indexJackson County: 37 indexMeade County: 35 indexMinnehaha County: 42 indexPennington County: 33 indexUnion County: 38 indexAnderson County: 43 indexBlount County: 44 indexClaiborne County: 38 indexDavidson County: 53 indexDeKalb County: 37 indexDyer County: 33 indexHamilton County: 47 indexJefferson County: 47 indexKnox County: 52 indexLawrence County: 35 indexLoudon County: 47 indexMcMinn County: 43 indexMadison County: 37 indexMaury County: 36 indexMontgomery County: 42 indexPutnam County: 39 indexRoane County: 42 indexSevier County: 44 indexShelby County: 47 indexSullivan County: 42 indexSumner County: 44 indexUnion County: 11 indexWilliamson County: 40 indexWilson County: 41 indexBell County: 38 indexBexar County: 49 indexBowie County: 48 indexBrazoria County: 36 indexBrewster County: 41 indexCameron County: 45 indexCollin County: 37 indexCulberson County: 19 indexDallas County: 50 indexDenton County: 44 indexEctor County: 36 indexEllis County: 46 indexEl Paso County: 55 indexFayette County: 34 indexGalveston County: 44 indexGregg County: 36 indexHarris County: 55 indexHarrison County: 42 indexHidalgo County: 43 indexHood County: 35 indexHunt County: 35 indexJefferson County: 45 indexJohnson County: 40 indexKaufman County: 42 indexKleberg County: 37 indexLubbock County: 28 indexMcLennan County: 37 indexMaverick County: 36 indexMontgomery County: 49 indexNavarro County: 43 indexNueces County: 40 indexOrange County: 39 indexParker County: 37 indexPolk County: 32 indexPotter County: 28 indexRandall County: 41 indexRockwall County: 35 indexSmith County: 37 indexTarrant County: 48 indexTravis County: 47 indexVictoria County: 33 indexWebb County: 46 indexBox Elder County: 41 indexCache County: 46 indexCarbon County: 44 indexDavis County: 47 indexDuchesne County: 45 indexGarfield County: 11 indexSalt Lake County: 53 indexSan Juan County: 44 indexTooele County: 44 indexUintah County: 47 indexUtah County: 50 indexWashington County: 43 indexWayne County: 11 indexWeber County: 49 indexBennington County: 37 indexChittenden County: 36 indexRutland County: 38 indexWindham County: 13 indexAlbemarle County: 41 indexArlington County: 38 indexCaroline County: 36 indexCarroll County: 11 indexCharles City County: 32 indexChesterfield County: 39 indexFairfax County: 44 indexFauquier County: 35 indexFrederick County: 42 indexGiles County: 39 indexHanover County: 39 indexHenrico County: 43 indexKing William County: 8 indexLoudoun County: 36 indexMadison County: 41 indexPrince Edward County: 33 indexPrince William County: 31 indexRoanoke County: 41 indexRockbridge County: 35 indexRockingham County: 34 indexStafford County: 39 indexWythe County: 41 indexAlexandria city: 12 indexBristol city: 39 indexFredericksburg city: 11 indexHampton city: 38 indexHopewell city: 11 indexLynchburg city: 38 indexNorfolk city: 19 indexRichmond city: 44 indexSalem city: 41 indexSuffolk city: 37 indexVirginia Beach city: 34 indexWinchester city: 10 indexAdams County: 19 indexAsotin County: 36 indexBenton County: 35 indexChelan County: 29 indexClallam County: 40 indexClark County: 31 indexColumbia County: 20 indexCowlitz County: 23 indexFranklin County: 18 indexGrant County: 24 indexGrays Harbor County: 28 indexJefferson County: 24 indexKing County: 44 indexKitsap County: 21 indexKittitas County: 25 indexKlickitat County: 19 indexLewis County: 26 indexMason County: 27 indexOkanogan County: 38 indexPierce County: 42 indexSkagit County: 34 indexSnohomish County: 32 indexSpokane County: 42 indexStevens County: 34 indexThurston County: 31 indexWalla Walla County: 24 indexWhatcom County: 28 indexWhitman County: 23 indexYakima County: 44 indexBerkeley County: 42 indexBrooke County: 19 indexCabell County: 40 indexGilmer County: 32 indexGreenbrier County: 39 indexHancock County: 36 indexHarrison County: 41 indexKanawha County: 41 indexMarion County: 44 indexMarshall County: 48 indexMonongalia County: 38 indexOhio County: 44 indexTucker County: 36 indexWood County: 43 indexAshland County: 32 indexBrown County: 36 indexColumbia County: 38 indexDane County: 41 indexDodge County: 38 indexDoor County: 36 indexEau Claire County: 40 indexFond du Lac County: 38 indexForest County: 34 indexGrant County: 38 indexJefferson County: 40 indexKenosha County: 43 indexKewaunee County: 37 indexLa Crosse County: 37 indexManitowoc County: 37 indexMarathon County: 35 indexMilwaukee County: 44 indexOutagamie County: 36 indexOzaukee County: 38 indexRacine County: 42 indexRock County: 39 indexSauk County: 35 indexSheboygan County: 39 indexTaylor County: 35 indexVilas County: 32 indexWalworth County: 38 indexWaukesha County: 44 indexAlbany County: 46 indexBig Horn County: 38 indexCampbell County: 44 indexCarbon County: 42 indexConverse County: 41 indexFremont County: 44 indexGoshen County: 43 indexLaramie County: 43 indexLincoln County: 13 indexNatrona County: 41 indexPark County: 16 indexPlatte County: 16 indexSheridan County: 39 indexSublette County: 45 indexSweetwater County: 44 indexTeton County: 42 indexUinta County: 42 indexWeston County: 42 index

Boundaries: U.S. Census Bureau cartographic boundary files.