US counties by median Air Quality Index (US EPA), 2012

Riverside County 94, the highest of 1026 counties, 2012

Baldwin County: 41 indexClay County: 46 indexColbert County: 43 indexDeKalb County: 42 indexElmore County: 40 indexEtowah County: 43 indexHouston County: 40 indexJefferson County: 58 indexLawrence County: 37 indexMadison County: 45 indexMobile County: 40 indexMontgomery County: 46 indexMorgan County: 45 indexRussell County: 46 indexShelby County: 45 indexTalladega County: 53 indexTuscaloosa County: 39 indexAleutians East Borough: 13 indexAnchorage Municipality: 34 indexDenali Borough: 32 indexFairbanks North Star Borough: 43 indexJuneau City and Borough: 28 indexKenai Peninsula Borough: 10 indexMatanuska-Susitna Borough: 36 indexYukon-Koyukuk Census Area: 6 indexApache County: 17 indexCochise County: 50 indexCoconino County: 47 indexGila County: 54 indexLa Paz County: 49 indexMaricopa County: 71 indexMohave County: 20 indexNavajo County: 45 indexPima County: 51 indexPinal County: 75 indexSanta Cruz County: 42 indexYavapai County: 45 indexYuma County: 47 indexArkansas County: 52 indexAshley County: 51 indexClark County: 35 indexCrittenden County: 44 indexFaulkner County: 52 indexGarland County: 53 indexJackson County: 48 indexNewton County: 43 indexPhillips County: 48 indexPolk County: 44 indexPope County: 46 indexPulaski County: 58 indexUnion County: 54 indexWashington County: 44 indexAlameda County: 50 indexAlpine County: 50 indexAmador County: 40 indexButte County: 57 indexCalaveras County: 47 indexColusa County: 56 indexContra Costa County: 41 indexDel Norte County: 12 indexEl Dorado County: 45 indexFresno County: 82 indexGlenn County: 46 indexHumboldt County: 39 indexImperial County: 55 indexInyo County: 49 indexKern County: 85 indexKings County: 68 indexLake County: 35 indexLos Angeles County: 84 indexMadera County: 68 indexMarin County: 42 indexMariposa County: 58 indexMendocino County: 38 indexMerced County: 57 indexMono County: 18 indexMonterey County: 41 indexNapa County: 44 indexNevada County: 43 indexOrange County: 60 indexPlacer County: 54 indexPlumas County: 48 indexRiverside County: 94 indexSacramento County: 56 indexSan Benito County: 42 indexSan Bernardino County: 90 indexSan Diego County: 67 indexSan Francisco County: 42 indexSan Joaquin County: 60 indexSan Luis Obispo County: 57 indexSan Mateo County: 42 indexSanta Barbara County: 52 indexSanta Clara County: 52 indexSanta Cruz County: 36 indexShasta County: 44 indexSiskiyou County: 37 indexSolano County: 46 indexSonoma County: 41 indexStanislaus County: 64 indexSutter County: 53 indexTehama County: 51 indexTrinity County: 54 indexTulare County: 81 indexTuolumne County: 42 indexVentura County: 58 indexYolo County: 49 indexAdams County: 49 indexAlamosa County: 24 indexArapahoe County: 48 indexArchuleta County: 19 indexBoulder County: 50 indexChaffee County: 54 indexClear Creek County: 90 indexDelta County: 21 indexDenver County: 54 indexDouglas County: 48 indexEl Paso County: 48 indexFremont County: 15 indexGarfield County: 61 indexGunnison County: 46 indexJackson County: 40 indexJefferson County: 48 indexLa Plata County: 48 indexLarimer County: 54 indexMesa County: 50 indexMoffat County: 44 indexMontezuma County: 47 indexPark County: 47 indexPitkin County: 31 indexProwers County: 23 indexPueblo County: 31 indexRio Blanco County: 51 indexRoutt County: 15 indexSan Juan County: 13 indexSan Miguel County: 44 indexSummit County: 12 indexWeld County: 49 indexKent County: 44 indexNew Castle County: 55 indexSussex County: 41 indexDistrict of Columbia: 61 indexAlachua County: 39 indexBaker County: 33 indexBay County: 44 indexBrevard County: 46 indexBroward County: 44 indexCitrus County: 36 indexCollier County: 44 indexColumbia County: 38 indexDuval County: 42 indexEscambia County: 50 indexFlagler County: 35 indexHamilton County: 48 indexHighlands County: 34 indexHillsborough County: 53 indexHolmes County: 44 indexIndian River County: 37 indexLake County: 35 indexLee County: 43 indexLeon County: 50 indexLiberty County: 32 indexManatee County: 36 indexMarion County: 48 indexMartin County: 46 indexMiami-Dade County: 52 indexOkaloosa County: 33 indexOrange County: 47 indexOsceola County: 35 indexPalm Beach County: 47 indexPasco County: 38 indexPinellas County: 50 indexPolk County: 49 indexPutnam County: 17 indexSt. Lucie County: 36 indexSanta Rosa County: 46 indexSarasota County: 52 indexSeminole County: 37 indexVolusia County: 46 indexWakulla County: 36 indexBibb County: 54 indexCharlton County: 36 indexChatham County: 51 indexChattooga County: 39 indexClarke County: 52 indexClayton County: 54 indexCobb County: 53 indexCoffee County: 47 indexColumbia County: 43 indexCoweta County: 48 indexDawson County: 40 indexDeKalb County: 61 indexDougherty County: 51 indexDouglas County: 43 indexFloyd County: 68 indexFulton County: 55 indexGlynn County: 36 indexGwinnett County: 52 indexHall County: 54 indexHenry County: 52 indexHouston County: 53 indexLowndes County: 57 indexMurray County: 43 indexMuscogee County: 51 indexPaulding County: 55 indexPike County: 41 indexRichmond County: 52 indexRockdale County: 36 indexSumter County: 40 indexWalker County: 55 indexWashington County: 47 indexWilkinson County: 53 indexHawaii County: 65 indexHonolulu County: 41 indexKauai County: 36 indexMaui County: 33 indexAda County: 41 indexBannock County: 42 indexBenewah County: 34 indexBonner County: 8 indexButte County: 42 indexCanyon County: 18 indexCuster County: 12 indexFranklin County: 42 indexIdaho County: 14 indexLatah County: 16 indexLemhi County: 54 indexNez Perce County: 24 indexShoshone County: 44 indexTwin Falls County: 28 indexAdams County: 35 indexChampaign County: 41 indexClark County: 43 indexCook County: 61 indexDuPage County: 52 indexEffingham County: 46 indexHamilton County: 49 indexJersey County: 49 indexJo Daviess County: 36 indexKane County: 31 indexLake County: 34 indexMcHenry County: 49 indexMcLean County: 38 indexMacon County: 52 indexMacoupin County: 36 indexMadison County: 58 indexPeoria County: 54 indexRandolph County: 38 indexRock Island County: 31 indexSt. Clair County: 51 indexSangamon County: 37 indexWill County: 35 indexWinnebago County: 33 indexAllen County: 60 indexBoone County: 49 indexCarroll County: 47 indexClark County: 55 indexDelaware County: 48 indexDubois County: 53 indexElkhart County: 54 indexFloyd County: 53 indexGreene County: 52 indexHamilton County: 48 indexHancock County: 40 indexHendricks County: 45 indexHenry County: 47 indexHoward County: 44 indexHuntington County: 42 indexJackson County: 42 indexJohnson County: 47 indexKnox County: 39 indexLake County: 58 indexLaPorte County: 48 indexMadison County: 53 indexMarion County: 64 indexMonroe County: 43 indexMorgan County: 44 indexPerry County: 49 indexPorter County: 56 indexPosey County: 43 indexSt. Joseph County: 57 indexShelby County: 49 indexSpencer County: 52 indexTippecanoe County: 59 indexVanderburgh County: 57 indexVigo County: 55 indexWabash County: 37 indexWarrick County: 49 indexWhitley County: 44 indexBlack Hawk County: 52 indexBremer County: 43 indexCerro Gordo County: 19 indexClinton County: 60 indexDelaware County: 42 indexHarrison County: 46 indexJohnson County: 55 indexLee County: 52 indexLinn County: 52 indexMontgomery County: 50 indexMuscatine County: 55 indexPalo Alto County: 48 indexPolk County: 52 indexPottawattamie County: 52 indexScott County: 59 indexStory County: 43 indexVan Buren County: 50 indexWarren County: 43 indexWoodbury County: 47 indexChase County: 35 indexFord County: 12 indexJohnson County: 41 indexLeavenworth County: 38 indexLinn County: 42 indexNeosho County: 19 indexRiley County: 39 indexSedgwick County: 47 indexShawnee County: 44 indexSherman County: 21 indexSumner County: 42 indexTrego County: 42 indexWyandotte County: 55 indexBell County: 47 indexBoone County: 43 indexBoyd County: 46 indexBullitt County: 43 indexCampbell County: 52 indexCarter County: 43 indexChristian County: 48 indexDaviess County: 49 indexEdmonson County: 43 indexFayette County: 53 indexGreenup County: 46 indexHancock County: 44 indexHardin County: 47 indexHenderson County: 49 indexJefferson County: 58 indexJessamine County: 43 indexLivingston County: 46 indexMcCracken County: 50 indexMadison County: 43 indexMarshall County: 14 indexMorgan County: 39 indexOldham County: 47 indexPerry County: 54 indexPike County: 47 indexPulaski County: 44 indexSimpson County: 43 indexTrigg County: 40 indexWarren County: 47 indexWashington County: 42 indexAscension Parish: 37 indexBossier Parish: 48 indexCaddo Parish: 43 indexCalcasieu Parish: 49 indexEast Baton Rouge Parish: 54 indexIberville Parish: 42 indexJefferson Parish: 48 indexLafayette Parish: 53 indexLafourche Parish: 41 indexLivingston Parish: 44 indexOrleans Parish: 51 indexOuachita Parish: 57 indexPointe Coupee Parish: 41 indexRapides Parish: 57 indexSt. Bernard Parish: 55 indexSt. Charles Parish: 36 indexSt. James Parish: 33 indexSt. John the Baptist Parish: 40 indexSt. Tammany Parish: 46 indexTangipahoa Parish: 45 indexTerrebonne Parish: 37 indexWest Baton Rouge Parish: 54 indexAndroscoggin County: 39 indexAroostook County: 35 indexCumberland County: 40 indexHancock County: 36 indexKennebec County: 29 indexKnox County: 34 indexOxford County: 31 indexPenobscot County: 39 indexSagadahoc County: 36 indexWashington County: 32 indexYork County: 41 indexAnne Arundel County: 49 indexBaltimore County: 44 indexCalvert County: 45 indexCarroll County: 45 indexCecil County: 51 indexCharles County: 45 indexDorchester County: 41 indexFrederick County: 47 indexGarrett County: 47 indexHarford County: 54 indexKent County: 54 indexMontgomery County: 52 indexPrince George's County: 54 indexWashington County: 52 indexBaltimore city: 55 indexBarnstable County: 37 indexBerkshire County: 51 indexBristol County: 43 indexDukes County: 38 indexEssex County: 47 indexHampden County: 51 indexHampshire County: 38 indexMiddlesex County: 34 indexNorfolk County: 41 indexPlymouth County: 39 indexSuffolk County: 53 indexWorcester County: 45 indexAllegan County: 47 indexBay County: 36 indexBenzie County: 43 indexBerrien County: 46 indexCass County: 46 indexChippewa County: 38 indexClinton County: 44 indexGenesee County: 45 indexHuron County: 44 indexIngham County: 38 indexKalamazoo County: 48 indexKent County: 51 indexKeweenaw County: 15 indexLenawee County: 50 indexMacomb County: 46 indexManistee County: 40 indexMason County: 42 indexMissaukee County: 38 indexMonroe County: 52 indexMuskegon County: 45 indexOakland County: 47 indexOttawa County: 46 indexSt. Clair County: 44 indexSchoolcraft County: 35 indexTuscola County: 34 indexWashtenaw County: 42 indexWayne County: 58 indexWexford County: 33 indexAnoka County: 47 indexBecker County: 41 indexCarlton County: 32 indexCass County: 22 indexCook County: 25 indexCrow Wing County: 39 indexDakota County: 40 indexGoodhue County: 38 indexHennepin County: 44 indexLake County: 33 indexLyon County: 43 indexMille Lacs County: 33 indexOlmsted County: 44 indexRamsey County: 46 indexRock County: 33 indexSt. Louis County: 38 indexScott County: 42 indexStearns County: 43 indexWashington County: 49 indexWinona County: 27 indexWright County: 43 indexBolivar County: 52 indexDeSoto County: 52 indexForrest County: 52 indexHancock County: 38 indexHarrison County: 49 indexHinds County: 53 indexJackson County: 33 indexJones County: 52 indexLauderdale County: 52 indexLee County: 52 indexYalobusha County: 36 indexAndrew County: 46 indexBoone County: 45 indexBuchanan County: 53 indexCallaway County: 45 indexCass County: 57 indexCedar County: 53 indexClay County: 52 indexClinton County: 49 indexGreene County: 55 indexJackson County: 53 indexJasper County: 41 indexJefferson County: 53 indexLincoln County: 49 indexMonroe County: 32 indexPerry County: 48 indexSt. Charles County: 49 indexSte. Genevieve County: 47 indexSt. Louis County: 56 indexStoddard County: 41 indexTaney County: 44 indexSt. Louis city: 61 indexCascade County: 42 indexFergus County: 27 indexFlathead County: 41 indexGallatin County: 33 indexLake County: 9 indexLewis and Clark County: 43 indexLincoln County: 51 indexMissoula County: 65 indexPhillips County: 31 indexPowder River County: 43 indexPowell County: 12 indexRavalli County: 36 indexRichland County: 44 indexRoosevelt County: 18 indexRosebud County: 44 indexSanders County: 11 indexSheridan County: 18 indexSilver Bow County: 39 indexYellowstone County: 23 indexCass County: 27 indexDawson County: 26 indexDouglas County: 56 indexGarden County: 19 indexHall County: 40 indexKnox County: 38 indexLancaster County: 41 indexSarpy County: 52 indexScotts Bluff County: 48 indexThomas County: 24 indexWashington County: 46 indexChurchill County: 32 indexClark County: 66 indexDouglas County: 14 indexElko County: 23 indexLyon County: 47 indexMineral County: 14 indexNye County: 19 indexWashoe County: 58 indexWhite Pine County: 46 indexCarson City: 48 indexBelknap County: 37 indexCheshire County: 40 indexCoos County: 45 indexGrafton County: 38 indexHillsborough County: 40 indexMerrimack County: 42 indexRockingham County: 43 indexAtlantic County: 41 indexBergen County: 38 indexCamden County: 49 indexCumberland County: 42 indexEssex County: 50 indexGloucester County: 45 indexHudson County: 51 indexHunterdon County: 48 indexMercer County: 48 indexMiddlesex County: 43 indexMonmouth County: 37 indexMorris County: 37 indexOcean County: 43 indexPassaic County: 41 indexUnion County: 53 indexWarren County: 47 indexBernalillo County: 62 indexCatron County: 17 indexChaves County: 33 indexDoña Ana County: 54 indexEddy County: 45 indexGrant County: 41 indexLea County: 41 indexLincoln County: 21 indexLos Alamos County: 19 indexLuna County: 46 indexMcKinley County: 14 indexRio Arriba County: 16 indexSandoval County: 43 indexSan Juan County: 48 indexSanta Fe County: 45 indexSocorro County: 25 indexTaos County: 22 indexValencia County: 44 indexAlbany County: 42 indexBronx County: 53 indexChautauqua County: 40 indexChemung County: 33 indexDutchess County: 32 indexErie County: 52 indexEssex County: 41 indexFranklin County: 12 indexHamilton County: 34 indexHerkimer County: 33 indexJefferson County: 32 indexKings County: 51 indexMadison County: 33 indexMonroe County: 44 indexNassau County: 46 indexNew York County: 54 indexNiagara County: 51 indexOneida County: 42 indexOnondaga County: 35 indexOrange County: 42 indexOswego County: 34 indexPutnam County: 29 indexQueens County: 50 indexRensselaer County: 34 indexRichmond County: 51 indexRockland County: 42 indexSaratoga County: 31 indexSteuben County: 35 indexSuffolk County: 44 indexTompkins County: 37 indexUlster County: 36 indexWayne County: 33 indexWestchester County: 43 indexAlamance County: 49 indexAlexander County: 44 indexAvery County: 42 indexBuncombe County: 47 indexCaldwell County: 42 indexCarteret County: 35 indexCaswell County: 52 indexCatawba County: 51 indexChatham County: 39 indexCumberland County: 48 indexDavidson County: 53 indexDavie County: 44 indexDuplin County: 53 indexDurham County: 47 indexEdgecombe County: 46 indexForsyth County: 52 indexFranklin County: 42 indexGaston County: 52 indexGraham County: 48 indexGranville County: 42 indexGuilford County: 51 indexHaywood County: 50 indexHyde County: 29 indexJackson County: 48 indexJohnston County: 42 indexLenoir County: 41 indexLincoln County: 46 indexMcDowell County: 49 indexMacon County: 35 indexMartin County: 43 indexMecklenburg County: 54 indexMitchell County: 44 indexMontgomery County: 40 indexNew Hanover County: 42 indexPerson County: 41 indexPitt County: 42 indexRobeson County: 45 indexRockingham County: 44 indexRowan County: 52 indexSwain County: 47 indexUnion County: 40 indexWake County: 52 indexWatauga County: 42 indexWayne County: 49 indexYancey County: 47 indexBillings County: 35 indexBurke County: 40 indexBurleigh County: 40 indexCass County: 43 indexDunn County: 39 indexMcKenzie County: 42 indexMercer County: 40 indexOliver County: 38 indexAdams County: 42 indexAllen County: 43 indexAshtabula County: 44 indexAthens County: 45 indexButler County: 50 indexClark County: 56 indexClermont County: 54 indexClinton County: 49 indexColumbiana County: 19 indexCuyahoga County: 65 indexDelaware County: 46 indexFayette County: 38 indexFranklin County: 55 indexGeauga County: 47 indexGreene County: 54 indexHamilton County: 61 indexJefferson County: 58 indexKnox County: 45 indexLake County: 53 indexLawrence County: 53 indexLicking County: 47 indexLorain County: 46 indexLucas County: 54 indexMadison County: 47 indexMahoning County: 53 indexMedina County: 48 indexMiami County: 47 indexMontgomery County: 55 indexNoble County: 41 indexPortage County: 44 indexPreble County: 54 indexScioto County: 20 indexStark County: 57 indexSummit County: 55 indexTrumbull County: 53 indexWarren County: 58 indexWashington County: 47 indexWood County: 44 indexAdair County: 53 indexCaddo County: 40 indexCanadian County: 40 indexCarter County: 55 indexCherokee County: 44 indexCleveland County: 56 indexComanche County: 54 indexCotton County: 44 indexCreek County: 42 indexDewey County: 47 indexEllis County: 33 indexKay County: 55 indexMcClain County: 39 indexMcCurtain County: 40 indexMayes County: 44 indexMuskogee County: 26 indexOklahoma County: 54 indexOsage County: 39 indexOttawa County: 53 indexPittsburg County: 56 indexSequoyah County: 44 indexTulsa County: 58 indexBaker County: 33 indexBenton County: 21 indexClackamas County: 32 indexColumbia County: 31 indexCoos County: 23 indexCrook County: 33 indexDeschutes County: 39 indexDouglas County: 26 indexGrant County: 39 indexHarney County: 39 indexJackson County: 49 indexJefferson County: 32 indexJosephine County: 31 indexKlamath County: 39 indexLake County: 32 indexLane County: 44 indexLinn County: 31 indexMarion County: 33 indexMultnomah County: 38 indexUmatilla County: 42 indexUnion County: 34 indexWallowa County: 26 indexWasco County: 26 indexWashington County: 37 indexAdams County: 53 indexAllegheny County: 61 indexArmstrong County: 51 indexBeaver County: 58 indexBerks County: 57 indexBlair County: 54 indexBucks County: 55 indexCambria County: 54 indexCentre County: 54 indexChester County: 51 indexClearfield County: 35 indexCumberland County: 54 indexDauphin County: 54 indexDelaware County: 55 indexElk County: 37 indexErie County: 54 indexFranklin County: 40 indexGreene County: 42 indexIndiana County: 38 indexLackawanna County: 45 indexLancaster County: 60 indexLawrence County: 34 indexLebanon County: 57 indexLehigh County: 34 indexLuzerne County: 33 indexLycoming County: 33 indexMercer County: 56 indexMonroe County: 44 indexMontgomery County: 51 indexNorthampton County: 57 indexPerry County: 34 indexPhiladelphia County: 60 indexSomerset County: 36 indexTioga County: 36 indexWashington County: 58 indexWestmoreland County: 55 indexYork County: 56 indexKent County: 39 indexProvidence County: 49 indexWashington County: 41 indexAbbeville County: 41 indexAiken County: 36 indexAnderson County: 41 indexBerkeley County: 35 indexCharleston County: 52 indexCherokee County: 47 indexChesterfield County: 43 indexColleton County: 46 indexDarlington County: 39 indexEdgefield County: 49 indexFlorence County: 49 indexGeorgetown County: 17 indexGreenville County: 52 indexLexington County: 52 indexOconee County: 42 indexPickens County: 44 indexRichland County: 51 indexSpartanburg County: 53 indexYork County: 41 indexBrookings County: 40 indexBrown County: 37 indexCodington County: 52 indexCuster County: 43 indexJackson County: 37 indexMeade County: 41 indexMinnehaha County: 46 indexPennington County: 38 indexUnion County: 52 indexAnderson County: 44 indexBlount County: 44 indexBradley County: 12 indexClaiborne County: 37 indexDavidson County: 54 indexDeKalb County: 39 indexHamilton County: 50 indexJefferson County: 46 indexKnox County: 46 indexLawrence County: 48 indexLoudon County: 44 indexMcMinn County: 14 indexMeigs County: 45 indexMontgomery County: 52 indexRoane County: 59 indexRutherford County: 43 indexSevier County: 46 indexShelby County: 55 indexSullivan County: 38 indexSumner County: 48 indexUnion County: 21 indexWilliamson County: 44 indexWilson County: 44 indexBell County: 40 indexBexar County: 53 indexBowie County: 54 indexBrazoria County: 34 indexBrewster County: 45 indexCameron County: 51 indexCollin County: 42 indexCulberson County: 27 indexDallas County: 57 indexDenton County: 51 indexEctor County: 49 indexEllis County: 52 indexEl Paso County: 62 indexFayette County: 39 indexGalveston County: 45 indexGregg County: 36 indexHarris County: 59 indexHarrison County: 52 indexHidalgo County: 51 indexHood County: 39 indexHunt County: 38 indexJefferson County: 52 indexJohnson County: 38 indexKaufman County: 51 indexKleberg County: 46 indexLubbock County: 47 indexMcLennan County: 43 indexMaverick County: 44 indexMontgomery County: 49 indexNavarro County: 48 indexNueces County: 47 indexOrange County: 46 indexParker County: 40 indexPolk County: 37 indexPotter County: 36 indexRandall County: 45 indexRockwall County: 39 indexSmith County: 40 indexTarrant County: 55 indexTravis County: 51 indexVictoria County: 31 indexWebb County: 52 indexWichita County: 38 indexBox Elder County: 48 indexCache County: 51 indexCarbon County: 45 indexDaggett County: 51 indexDavis County: 41 indexDuchesne County: 48 indexGarfield County: 42 indexSalt Lake County: 54 indexSan Juan County: 46 indexTooele County: 46 indexUintah County: 54 indexUtah County: 54 indexWashington County: 47 indexWayne County: 14 indexWeber County: 54 indexBennington County: 39 indexChittenden County: 37 indexRutland County: 49 indexWindham County: 16 indexAlbemarle County: 44 indexArlington County: 39 indexCaroline County: 43 indexCarroll County: 9 indexCharles City County: 37 indexChesterfield County: 44 indexCulpeper County: 13 indexFairfax County: 49 indexFauquier County: 38 indexFrederick County: 51 indexGiles County: 41 indexHanover County: 43 indexHenrico County: 48 indexKing William County: 11 indexLoudoun County: 38 indexMadison County: 44 indexPage County: 45 indexPrince Edward County: 36 indexPrince William County: 31 indexRoanoke County: 33 indexRockbridge County: 41 indexRockingham County: 39 indexStafford County: 44 indexWarren County: 10 indexWythe County: 44 indexAlexandria city: 35 indexBristol city: 47 indexFredericksburg city: 13 indexHampton city: 45 indexHopewell city: 13 indexLynchburg city: 41 indexNorfolk city: 23 indexRichmond city: 20 indexRoanoke city: 47 indexSalem city: 47 indexSuffolk city: 43 indexVirginia Beach city: 41 indexWinchester city: 14 indexAdams County: 21 indexAsotin County: 39 indexBenton County: 29 indexChelan County: 42 indexClallam County: 43 indexClark County: 37 indexColumbia County: 24 indexCowlitz County: 26 indexFranklin County: 25 indexGrant County: 29 indexGrays Harbor County: 27 indexJefferson County: 24 indexKing County: 51 indexKitsap County: 25 indexKittitas County: 28 indexKlickitat County: 23 indexLewis County: 28 indexMason County: 33 indexOkanogan County: 47 indexPierce County: 44 indexSkagit County: 31 indexSnohomish County: 38 indexSpokane County: 47 indexStevens County: 43 indexThurston County: 35 indexWalla Walla County: 24 indexWhatcom County: 26 indexWhitman County: 25 indexYakima County: 48 indexBerkeley County: 47 indexBrooke County: 20 indexCabell County: 48 indexGilmer County: 34 indexGreenbrier County: 44 indexHancock County: 41 indexHarrison County: 51 indexKanawha County: 46 indexMarion County: 52 indexMarshall County: 57 indexMonongalia County: 44 indexOhio County: 49 indexRaleigh County: 44 indexTucker County: 38 indexWood County: 47 indexAshland County: 32 indexBarron County: 14 indexBrown County: 47 indexChippewa County: 13 indexColumbia County: 43 indexDane County: 52 indexDodge County: 49 indexDoor County: 38 indexEau Claire County: 43 indexFond du Lac County: 42 indexForest County: 36 indexGrant County: 43 indexJackson County: 9 indexJefferson County: 44 indexKenosha County: 50 indexKewaunee County: 41 indexLa Crosse County: 47 indexManitowoc County: 39 indexMarathon County: 41 indexMilwaukee County: 53 indexMonroe County: 10 indexOutagamie County: 49 indexOzaukee County: 47 indexRacine County: 42 indexRock County: 45 indexSauk County: 44 indexSheboygan County: 42 indexTaylor County: 40 indexVilas County: 36 indexWalworth County: 44 indexWaukesha County: 56 indexAlbany County: 51 indexBig Horn County: 36 indexCampbell County: 57 indexCarbon County: 43 indexConverse County: 29 indexCrook County: 58 indexFremont County: 47 indexJohnson County: 11 indexLaramie County: 47 indexLincoln County: 19 indexNatrona County: 31 indexPark County: 21 indexPlatte County: 17 indexSheridan County: 23 indexSublette County: 50 indexSweetwater County: 47 indexTeton County: 45 indexUinta County: 44 indexWeston County: 37 index

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