US counties by median Air Quality Index (US EPA), 2017

Riverside County 87, the highest of 1006 counties, 2017

Baldwin County: 39 indexClay County: 40 indexColbert County: 39 indexDeKalb County: 40 indexElmore County: 35 indexEtowah County: 53 indexHouston County: 37 indexJefferson County: 56 indexLawrence County: 31 indexMadison County: 40 indexMobile County: 43 indexMontgomery County: 53 indexMorgan County: 43 indexRussell County: 46 indexShelby County: 38 indexSumter County: 38 indexTalladega County: 44 indexTuscaloosa County: 57 indexAleutians East Borough: 12 indexAnchorage Municipality: 28 indexDenali Borough: 34 indexFairbanks North Star Borough: 44 indexJuneau City and Borough: 20 indexKenai Peninsula Borough: 8 indexMatanuska-Susitna Borough: 32 indexApache County: 14 indexCochise County: 45 indexCoconino County: 46 indexGila County: 44 indexLa Paz County: 44 indexMaricopa County: 71 indexMohave County: 17 indexNavajo County: 44 indexPima County: 54 indexPinal County: 75 indexSanta Cruz County: 40 indexYavapai County: 46 indexYuma County: 49 indexArkansas County: 39 indexAshley County: 44 indexClark County: 34 indexCrittenden County: 48 indexGarland County: 46 indexJackson County: 40 indexNewton County: 38 indexPolk County: 41 indexPulaski County: 52 indexUnion County: 52 indexWashington County: 51 indexAlameda County: 56 indexAmador County: 38 indexButte County: 59 indexCalaveras County: 57 indexColusa County: 43 indexContra Costa County: 54 indexDel Norte County: 27 indexEl Dorado County: 45 indexFresno County: 75 indexGlenn County: 46 indexHumboldt County: 37 indexImperial County: 64 indexInyo County: 49 indexKern County: 85 indexKings County: 72 indexLake County: 35 indexLos Angeles County: 79 indexMadera County: 62 indexMarin County: 44 indexMariposa County: 54 indexMendocino County: 45 indexMerced County: 58 indexMono County: 18 indexMonterey County: 41 indexNapa County: 53 indexNevada County: 49 indexOrange County: 59 indexPlacer County: 46 indexPlumas County: 47 indexRiverside County: 87 indexSacramento County: 60 indexSan Benito County: 41 indexSan Bernardino County: 84 indexSan Diego County: 68 indexSan Francisco County: 44 indexSan Joaquin County: 55 indexSan Luis Obispo County: 58 indexSan Mateo County: 42 indexSanta Barbara County: 51 indexSanta Clara County: 52 indexSanta Cruz County: 39 indexShasta County: 44 indexSiskiyou County: 28 indexSolano County: 52 indexSonoma County: 41 indexStanislaus County: 61 indexSutter County: 56 indexTehama County: 42 indexTrinity County: 57 indexTulare County: 81 indexTuolumne County: 44 indexVentura County: 57 indexYolo County: 45 indexAdams County: 52 indexAlamosa County: 19 indexArapahoe County: 47 indexArchuleta County: 36 indexBoulder County: 46 indexChaffee County: 35 indexClear Creek County: 50 indexDelta County: 19 indexDenver County: 53 indexDouglas County: 49 indexEl Paso County: 47 indexFremont County: 11 indexGarfield County: 47 indexGrand County: 44 indexGunnison County: 45 indexJackson County: 7 indexJefferson County: 47 indexLa Plata County: 46 indexLarimer County: 52 indexMesa County: 48 indexMoffat County: 44 indexMontezuma County: 44 indexMontrose County: 41 indexPark County: 48 indexPitkin County: 14 indexProwers County: 17 indexPueblo County: 26 indexRio Blanco County: 46 indexRoutt County: 15 indexSan Juan County: 9 indexSan Miguel County: 43 indexWeld County: 51 indexKent County: 42 indexNew Castle County: 50 indexSussex County: 44 indexDistrict of Columbia: 56 indexAlachua County: 42 indexBaker County: 33 indexBay County: 46 indexBrevard County: 43 indexBroward County: 52 indexCitrus County: 46 indexCollier County: 39 indexColumbia County: 45 indexDuval County: 46 indexEscambia County: 41 indexFlagler County: 33 indexHamilton County: 45 indexHighlands County: 32 indexHillsborough County: 52 indexHolmes County: 45 indexIndian River County: 38 indexLake County: 35 indexLee County: 40 indexLeon County: 49 indexLiberty County: 31 indexManatee County: 35 indexMarion County: 43 indexMartin County: 42 indexMiami-Dade County: 51 indexNassau County: 47 indexOkaloosa County: 35 indexOrange County: 49 indexOsceola County: 34 indexPalm Beach County: 49 indexPasco County: 37 indexPinellas County: 48 indexPolk County: 47 indexPutnam County: 15 indexSt. Lucie County: 35 indexSanta Rosa County: 47 indexSarasota County: 48 indexSeminole County: 38 indexVolusia County: 41 indexWakulla County: 41 indexBibb County: 45 indexCharlton County: 28 indexChatham County: 45 indexChattooga County: 36 indexClarke County: 43 indexClayton County: 51 indexCobb County: 43 indexCoffee County: 41 indexColumbia County: 37 indexCoweta County: 43 indexDawson County: 36 indexDeKalb County: 51 indexDougherty County: 50 indexDouglas County: 39 indexFloyd County: 54 indexFulton County: 55 indexGlynn County: 37 indexGwinnett County: 48 indexHall County: 48 indexHenry County: 43 indexHouston County: 47 indexLowndes County: 51 indexMurray County: 41 indexMuscogee County: 46 indexPaulding County: 28 indexPike County: 39 indexRichmond County: 48 indexRockdale County: 39 indexSumter County: 35 indexWalker County: 51 indexWashington County: 43 indexHawaii County: 58 indexHonolulu County: 32 indexKauai County: 15 indexMaui County: 28 indexAda County: 46 indexBannock County: 38 indexBenewah County: 53 indexBlaine County: 15 indexBoise County: 46 indexBonner County: 37 indexBonneville County: 32 indexButte County: 42 indexCanyon County: 40 indexCuster County: 7 indexFranklin County: 37 indexIdaho County: 44 indexJerome County: 30 indexKootenai County: 31 indexLatah County: 18 indexLemhi County: 37 indexNez Perce County: 36 indexShoshone County: 51 indexTwin Falls County: 46 indexValley County: 30 indexAdams County: 41 indexChampaign County: 45 indexClark County: 39 indexCook County: 55 indexDuPage County: 44 indexEffingham County: 43 indexHamilton County: 46 indexJersey County: 48 indexJo Daviess County: 34 indexKane County: 40 indexLake County: 35 indexMcHenry County: 44 indexMcLean County: 48 indexMacon County: 47 indexMacoupin County: 40 indexMadison County: 53 indexPeoria County: 51 indexRandolph County: 52 indexRock Island County: 42 indexSt. Clair County: 45 indexSangamon County: 43 indexWill County: 45 indexWinnebago County: 36 indexAllen County: 47 indexBartholomew County: 43 indexBoone County: 39 indexBrown County: 39 indexCarroll County: 39 indexClark County: 40 indexDelaware County: 40 indexDubois County: 42 indexElkhart County: 42 indexFloyd County: 49 indexGreene County: 43 indexHamilton County: 46 indexHendricks County: 38 indexHenry County: 38 indexHoward County: 45 indexHuntington County: 39 indexJackson County: 40 indexJohnson County: 39 indexKnox County: 36 indexLake County: 49 indexLaPorte County: 42 indexMadison County: 48 indexMarion County: 54 indexMonroe County: 36 indexMorgan County: 36 indexPerry County: 40 indexPorter County: 44 indexPosey County: 42 indexSt. Joseph County: 44 indexShelby County: 41 indexSpencer County: 43 indexSullivan County: 43 indexTippecanoe County: 48 indexVanderburgh County: 47 indexVigo County: 52 indexWabash County: 35 indexWarrick County: 42 indexWhitley County: 44 indexBlack Hawk County: 54 indexBremer County: 36 indexCerro Gordo County: 15 indexClinton County: 58 indexDelaware County: 29 indexHarrison County: 39 indexJohnson County: 44 indexLee County: 43 indexLinn County: 45 indexMontgomery County: 45 indexMuscatine County: 51 indexPalo Alto County: 49 indexPolk County: 45 indexPottawattamie County: 43 indexScott County: 56 indexVan Buren County: 47 indexWarren County: 39 indexWoodbury County: 37 indexChase County: 28 indexFord County: 16 indexJohnson County: 40 indexLeavenworth County: 34 indexNeosho County: 38 indexSedgwick County: 45 indexShawnee County: 43 indexSherman County: 15 indexSumner County: 39 indexTrego County: 36 indexWyandotte County: 49 indexBell County: 40 indexBoone County: 38 indexBoyd County: 47 indexBullitt County: 39 indexCampbell County: 51 indexCarter County: 38 indexChristian County: 41 indexDaviess County: 52 indexEdmonson County: 47 indexFayette County: 44 indexGreenup County: 36 indexHancock County: 40 indexHardin County: 51 indexHenderson County: 52 indexJefferson County: 54 indexJessamine County: 40 indexLivingston County: 40 indexMcCracken County: 50 indexMadison County: 39 indexMorgan County: 37 indexOldham County: 40 indexPerry County: 47 indexPike County: 47 indexPulaski County: 40 indexSimpson County: 40 indexTrigg County: 37 indexWarren County: 48 indexWashington County: 38 indexAscension Parish: 34 indexBossier Parish: 42 indexCaddo Parish: 39 indexCalcasieu Parish: 54 indexEast Baton Rouge Parish: 52 indexIberville Parish: 40 indexJefferson Parish: 43 indexLafayette Parish: 45 indexLafourche Parish: 38 indexLivingston Parish: 48 indexOrleans Parish: 49 indexOuachita Parish: 35 indexPointe Coupee Parish: 32 indexRapides Parish: 41 indexSt. Bernard Parish: 43 indexSt. James Parish: 31 indexSt. John the Baptist Parish: 33 indexSt. Martin Parish: 36 indexSt. Tammany Parish: 41 indexTangipahoa Parish: 41 indexTerrebonne Parish: 37 indexWest Baton Rouge Parish: 48 indexAndroscoggin County: 44 indexAroostook County: 40 indexCumberland County: 40 indexFranklin County: 27 indexHancock County: 37 indexKennebec County: 31 indexKnox County: 35 indexOxford County: 40 indexPenobscot County: 34 indexWashington County: 35 indexYork County: 37 indexAnne Arundel County: 41 indexBaltimore County: 43 indexCalvert County: 43 indexCarroll County: 41 indexCecil County: 45 indexCharles County: 44 indexDorchester County: 47 indexFrederick County: 42 indexGarrett County: 43 indexHarford County: 47 indexHoward County: 42 indexKent County: 49 indexMontgomery County: 43 indexPrince George's County: 45 indexWashington County: 45 indexBaltimore city: 46 indexBarnstable County: 37 indexBerkshire County: 47 indexBristol County: 42 indexDukes County: 37 indexEssex County: 40 indexFranklin County: 37 indexHampden County: 42 indexHampshire County: 38 indexMiddlesex County: 33 indexNorfolk County: 36 indexPlymouth County: 39 indexSuffolk County: 56 indexWorcester County: 40 indexAllegan County: 41 indexBay County: 36 indexBenzie County: 39 indexBerrien County: 41 indexCass County: 41 indexChippewa County: 39 indexClinton County: 38 indexGenesee County: 42 indexHuron County: 37 indexIngham County: 42 indexKalamazoo County: 44 indexKent County: 44 indexKeweenaw County: 13 indexLenawee County: 44 indexMacomb County: 42 indexManistee County: 37 indexMason County: 38 indexMissaukee County: 37 indexMonroe County: 38 indexMuskegon County: 39 indexOakland County: 42 indexOttawa County: 40 indexSt. Clair County: 44 indexSchoolcraft County: 33 indexTuscola County: 33 indexWashtenaw County: 46 indexWayne County: 57 indexWexford County: 35 indexAnoka County: 43 indexBecker County: 35 indexBeltrami County: 27 indexCarlton County: 31 indexCook County: 24 indexCrow Wing County: 34 indexDakota County: 37 indexGoodhue County: 34 indexHennepin County: 52 indexLake County: 30 indexLyon County: 35 indexMille Lacs County: 33 indexOlmsted County: 42 indexRamsey County: 41 indexSt. Louis County: 36 indexScott County: 34 indexStearns County: 37 indexWashington County: 46 indexWinona County: 22 indexWright County: 39 indexBolivar County: 36 indexDeSoto County: 46 indexForrest County: 46 indexGrenada County: 40 indexHancock County: 40 indexHarrison County: 44 indexHinds County: 52 indexJackson County: 34 indexLauderdale County: 34 indexLee County: 37 indexYalobusha County: 32 indexAndrew County: 42 indexBoone County: 41 indexBuchanan County: 46 indexCallaway County: 40 indexCass County: 43 indexCedar County: 41 indexClay County: 43 indexClinton County: 42 indexGreene County: 44 indexJackson County: 52 indexJasper County: 36 indexJefferson County: 42 indexLincoln County: 42 indexMonroe County: 37 indexPerry County: 44 indexSt. Charles County: 44 indexSte. Genevieve County: 44 indexSt. Louis County: 52 indexStoddard County: 32 indexTaney County: 39 indexSt. Louis city: 52 indexCascade County: 38 indexFergus County: 42 indexFlathead County: 42 indexGallatin County: 31 indexLake County: 9 indexLewis and Clark County: 47 indexLincoln County: 53 indexMissoula County: 65 indexPhillips County: 34 indexPowder River County: 42 indexPowell County: 9 indexRavalli County: 42 indexRichland County: 39 indexRoosevelt County: 15 indexRosebud County: 39 indexSanders County: 33 indexSheridan County: 17 indexSilver Bow County: 46 indexYellowstone County: 33 indexCass County: 22 indexDouglas County: 52 indexHall County: 31 indexKnox County: 36 indexLancaster County: 37 indexSarpy County: 51 indexScotts Bluff County: 31 indexThomas County: 16 indexWashington County: 35 indexChurchill County: 43 indexClark County: 61 indexDouglas County: 26 indexElko County: 24 indexLyon County: 42 indexNye County: 19 indexWashoe County: 52 indexWhite Pine County: 44 indexCarson City: 45 indexBelknap County: 34 indexCheshire County: 37 indexCoos County: 43 indexGrafton County: 38 indexHillsborough County: 37 indexMerrimack County: 32 indexRockingham County: 39 indexAtlantic County: 41 indexBergen County: 45 indexCamden County: 52 indexCumberland County: 42 indexEssex County: 44 indexGloucester County: 39 indexHudson County: 51 indexHunterdon County: 44 indexMercer County: 46 indexMiddlesex County: 44 indexMonmouth County: 31 indexMorris County: 35 indexOcean County: 40 indexPassaic County: 38 indexUnion County: 53 indexWarren County: 42 indexBernalillo County: 53 indexCatron County: 12 indexChaves County: 23 indexDoña Ana County: 58 indexEddy County: 45 indexLea County: 50 indexLincoln County: 14 indexLos Alamos County: 12 indexLuna County: 19 indexRio Arriba County: 45 indexSandoval County: 44 indexSan Juan County: 47 indexSanta Fe County: 44 indexSocorro County: 13 indexTaos County: 16 indexValencia County: 44 indexAlbany County: 41 indexBronx County: 44 indexChautauqua County: 38 indexDutchess County: 32 indexErie County: 48 indexEssex County: 40 indexFranklin County: 26 indexHamilton County: 34 indexHerkimer County: 31 indexJefferson County: 34 indexKings County: 38 indexMonroe County: 43 indexNassau County: 32 indexNew York County: 50 indexNiagara County: 35 indexOneida County: 26 indexOnondaga County: 36 indexOrange County: 39 indexOswego County: 34 indexPutnam County: 34 indexQueens County: 44 indexRichmond County: 44 indexRockland County: 38 indexSaratoga County: 34 indexSteuben County: 35 indexSuffolk County: 42 indexTompkins County: 35 indexWayne County: 36 indexWestchester County: 38 indexAlexander County: 38 indexAvery County: 40 indexBuncombe County: 43 indexCaldwell County: 42 indexCarteret County: 35 indexCaswell County: 37 indexCatawba County: 44 indexCumberland County: 48 indexDavidson County: 46 indexDurham County: 49 indexEdgecombe County: 41 indexForsyth County: 47 indexGraham County: 43 indexGranville County: 43 indexGuilford County: 45 indexHaywood County: 44 indexHyde County: 24 indexJackson County: 45 indexJohnston County: 46 indexLee County: 49 indexLenoir County: 35 indexLincoln County: 42 indexMacon County: 33 indexMartin County: 38 indexMecklenburg County: 53 indexMitchell County: 34 indexMontgomery County: 41 indexNew Hanover County: 38 indexPerson County: 41 indexPitt County: 43 indexRockingham County: 42 indexRowan County: 38 indexSwain County: 44 indexUnion County: 43 indexWake County: 52 indexYancey County: 44 indexBillings County: 37 indexBurke County: 36 indexBurleigh County: 39 indexCass County: 44 indexDunn County: 37 indexMcKenzie County: 37 indexMercer County: 35 indexOliver County: 39 indexStutsman County: 10 indexWard County: 34 indexWilliams County: 37 indexAdams County: 30 indexAllen County: 38 indexAshtabula County: 39 indexAthens County: 34 indexBelmont County: 16 indexButler County: 43 indexClark County: 47 indexClermont County: 48 indexClinton County: 42 indexColumbiana County: 14 indexCuyahoga County: 51 indexDelaware County: 38 indexFayette County: 35 indexFranklin County: 46 indexGeauga County: 43 indexGreene County: 44 indexHamilton County: 55 indexJefferson County: 56 indexKnox County: 38 indexLake County: 43 indexLawrence County: 40 indexLicking County: 39 indexLorain County: 38 indexLucas County: 46 indexMadison County: 41 indexMahoning County: 44 indexMedina County: 44 indexMiami County: 40 indexMontgomery County: 44 indexNoble County: 38 indexPortage County: 40 indexPreble County: 44 indexScioto County: 13 indexStark County: 51 indexSummit County: 46 indexTrumbull County: 44 indexWarren County: 49 indexWashington County: 41 indexWood County: 38 indexAdair County: 44 indexBryan County: 39 indexCaddo County: 35 indexCanadian County: 38 indexCarter County: 43 indexCherokee County: 39 indexChoctaw County: 38 indexCleveland County: 47 indexComanche County: 44 indexCreek County: 39 indexCuster County: 17 indexDewey County: 43 indexGrady County: 8 indexJefferson County: 41 indexKay County: 53 indexLincoln County: 27 indexLove County: 44 indexMcClain County: 39 indexMayes County: 38 indexMuskogee County: 20 indexOklahoma County: 51 indexOsage County: 39 indexOttawa County: 51 indexPittsburg County: 44 indexSequoyah County: 38 indexTulsa County: 54 indexWashington County: 47 indexBaker County: 30 indexBenton County: 20 indexClackamas County: 33 indexColumbia County: 29 indexCrook County: 35 indexDeschutes County: 27 indexDouglas County: 29 indexGrant County: 42 indexHarney County: 43 indexJackson County: 45 indexJefferson County: 37 indexJosephine County: 42 indexKlamath County: 39 indexLake County: 29 indexLane County: 46 indexLinn County: 32 indexMarion County: 33 indexMultnomah County: 38 indexUmatilla County: 44 indexUnion County: 31 indexWallowa County: 27 indexWasco County: 39 indexWashington County: 37 indexAdams County: 45 indexAllegheny County: 58 indexArmstrong County: 50 indexBeaver County: 54 indexBerks County: 49 indexBlair County: 45 indexBradford County: 42 indexBucks County: 34 indexCambria County: 55 indexCentre County: 51 indexChester County: 54 indexClearfield County: 36 indexCumberland County: 43 indexDauphin County: 47 indexDelaware County: 52 indexElk County: 35 indexErie County: 43 indexFranklin County: 33 indexGreene County: 42 indexIndiana County: 38 indexLackawanna County: 45 indexLancaster County: 55 indexLawrence County: 34 indexLebanon County: 56 indexLehigh County: 44 indexLuzerne County: 33 indexLycoming County: 33 indexMercer County: 55 indexMonroe County: 42 indexMontgomery County: 47 indexNorthampton County: 56 indexPhiladelphia County: 56 indexSomerset County: 36 indexTioga County: 53 indexWashington County: 55 indexWestmoreland County: 55 indexYork County: 47 indexKent County: 32 indexProvidence County: 45 indexWashington County: 35 indexAbbeville County: 25 indexAiken County: 38 indexAnderson County: 37 indexBerkeley County: 33 indexCharleston County: 44 indexChesterfield County: 40 indexColleton County: 41 indexDarlington County: 39 indexEdgefield County: 44 indexFlorence County: 38 indexGeorgetown County: 15 indexGreenville County: 49 indexHorry County: 32 indexLexington County: 44 indexOconee County: 39 indexPickens County: 41 indexRichland County: 44 indexSpartanburg County: 48 indexYork County: 38 indexBrookings County: 36 indexBrown County: 31 indexCodington County: 39 indexCuster County: 42 indexHughes County: 16 indexJackson County: 41 indexMeade County: 30 indexMinnehaha County: 38 indexPennington County: 37 indexUnion County: 41 indexAnderson County: 40 indexBlount County: 49 indexClaiborne County: 36 indexDavidson County: 53 indexDeKalb County: 36 indexDyer County: 39 indexHamilton County: 51 indexJefferson County: 43 indexKnox County: 41 indexLawrence County: 34 indexLoudon County: 41 indexMcMinn County: 43 indexMadison County: 36 indexMaury County: 40 indexMontgomery County: 41 indexPutnam County: 42 indexRoane County: 41 indexSevier County: 44 indexShelby County: 46 indexSullivan County: 45 indexSumner County: 44 indexWilliamson County: 40 indexWilson County: 39 indexBell County: 40 indexBexar County: 50 indexBowie County: 49 indexBrazoria County: 37 indexBrewster County: 42 indexCameron County: 42 indexCollin County: 39 indexCulberson County: 22 indexDallas County: 52 indexDenton County: 46 indexEctor County: 35 indexEllis County: 50 indexEl Paso County: 56 indexFayette County: 33 indexGalveston County: 41 indexGregg County: 35 indexHarris County: 54 indexHarrison County: 46 indexHidalgo County: 47 indexHood County: 36 indexHunt County: 35 indexJefferson County: 47 indexJohnson County: 41 indexKaufman County: 44 indexKleberg County: 43 indexLubbock County: 33 indexMcLennan County: 39 indexMaverick County: 39 indexMontgomery County: 46 indexNavarro County: 46 indexNueces County: 45 indexOrange County: 43 indexParker County: 37 indexPolk County: 31 indexPotter County: 28 indexRandall County: 43 indexRockwall County: 35 indexSmith County: 37 indexTarrant County: 51 indexTravis County: 50 indexVictoria County: 33 indexWebb County: 49 indexBox Elder County: 48 indexCache County: 47 indexCarbon County: 45 indexDavis County: 51 indexDuchesne County: 45 indexGarfield County: 44 indexSalt Lake County: 60 indexSan Juan County: 44 indexTooele County: 48 indexUintah County: 49 indexUtah County: 53 indexWashington County: 45 indexWayne County: 10 indexWeber County: 51 indexBennington County: 37 indexChittenden County: 37 indexRutland County: 40 indexWindham County: 14 indexAlbemarle County: 40 indexArlington County: 39 indexCaroline County: 39 indexCarroll County: 8 indexCharles City County: 34 indexChesterfield County: 40 indexFairfax County: 49 indexFauquier County: 36 indexFrederick County: 42 indexGiles County: 40 indexHanover County: 39 indexHenrico County: 43 indexLoudoun County: 38 indexMadison County: 41 indexPrince Edward County: 36 indexPrince William County: 34 indexRoanoke County: 42 indexRockbridge County: 38 indexRockingham County: 37 indexStafford County: 38 indexWythe County: 40 indexAlexandria city: 7 indexBristol city: 37 indexFredericksburg city: 7 indexHampton city: 40 indexHopewell city: 10 indexLynchburg city: 35 indexNorfolk city: 19 indexRichmond city: 36 indexSalem city: 37 indexSuffolk city: 40 indexVirginia Beach city: 34 indexWinchester city: 11 indexAdams County: 18 indexAsotin County: 39 indexBenton County: 39 indexChelan County: 37 indexClallam County: 41 indexClark County: 37 indexColumbia County: 28 indexCowlitz County: 26 indexFranklin County: 26 indexGarfield County: 28 indexGrant County: 28 indexGrays Harbor County: 27 indexJefferson County: 24 indexKing County: 48 indexKitsap County: 19 indexKittitas County: 38 indexKlickitat County: 21 indexLewis County: 26 indexMason County: 25 indexOkanogan County: 52 indexPierce County: 45 indexSkagit County: 35 indexSnohomish County: 33 indexSpokane County: 43 indexStevens County: 47 indexThurston County: 32 indexWalla Walla County: 23 indexWhatcom County: 31 indexWhitman County: 24 indexYakima County: 48 indexBerkeley County: 40 indexBrooke County: 18 indexCabell County: 41 indexGilmer County: 31 indexGreenbrier County: 39 indexHancock County: 38 indexHarrison County: 40 indexKanawha County: 47 indexMarion County: 42 indexMarshall County: 55 indexMonongalia County: 40 indexOhio County: 43 indexTucker County: 36 indexWood County: 40 indexAshland County: 33 indexBrown County: 38 indexColumbia County: 39 indexDane County: 42 indexDodge County: 39 indexDoor County: 37 indexEau Claire County: 41 indexFond du Lac County: 37 indexForest County: 36 indexGrant County: 33 indexJefferson County: 39 indexKenosha County: 43 indexKewaunee County: 39 indexLa Crosse County: 41 indexManitowoc County: 38 indexMarathon County: 36 indexMilwaukee County: 44 indexOutagamie County: 37 indexOzaukee County: 40 indexRacine County: 42 indexRock County: 40 indexSauk County: 39 indexSheboygan County: 41 indexTaylor County: 36 indexVilas County: 34 indexWalworth County: 39 indexWaukesha County: 43 indexAlbany County: 49 indexBig Horn County: 36 indexCampbell County: 45 indexCarbon County: 43 indexConverse County: 42 indexFremont County: 47 indexLaramie County: 45 indexLincoln County: 14 indexNatrona County: 44 indexPark County: 18 indexPlatte County: 15 indexSheridan County: 43 indexSublette County: 48 indexSweetwater County: 46 indexTeton County: 44 indexUinta County: 44 indexWeston County: 41 index

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