RANKING · 2024 ACS · 500 SHOWN OF 3,144

Largest Irish population, US counties

US counties ranked by the number of residents who are Irish ancestry, from the 2024 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. Cook County, Illinois leads at 432,999. 3,144 counties qualify in total. Massachusetts carries 5 of the top 25 entries. The median across all 3,144 is 2,394. Biggest climber in the top 100 since 2020: Lee County, FL, up 17 places to #61.

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SAME RANKING BYCities States Metros

YEAR2010 2020 2024

RANKPLACESTATEPOPIRISH POPULATIONVS 2010

USUnited States9.4% of US population334,922,49931,613,628–

01Cook County, ILIL5,194,625432,999−17%

02Maricopa County, AZAZ4,689,558400,177+1%

03Los Angeles County, CACA9,694,934370,162−13%

04Middlesex County, MAMA1,669,979300,318−14%

05▲1San Diego County, CACA3,282,248255,722−10%

06▼1Suffolk County, NYNY1,546,090247,260−27%

07Allegheny County, PAPA1,225,035208,956−16%

08▲2King County, WAWA2,344,939196,924−6%

09▼1Harris County, TXTX5,045,026195,678−8%

10▼1Orange County, CACA3,149,507190,775−24%

11Norfolk County, MAMA739,749175,576−17%

12▲1Montgomery County, PAPA877,643164,018−8%

13▼1Nassau County, NYNY1,398,939161,822−28%

14▲2Clark County, NVNV2,407,226158,933−8%

15Essex County, MAMA826,653152,156−11%

16▼2Philadelphia County, PAPA1,574,281151,253−23%

17▲1Franklin County, OHOH1,361,536149,529−9%

18▲3Erie County, NYNY946,741149,073−9%

19Worcester County, MAMA888,502148,126−16%

20▼3Plymouth County, MAMA546,829147,518−11%

21▲2Cuyahoga County, OHOH1,232,925145,837−14%

22Tarrant County, TXTX2,248,466142,803−10%

23▼3Bucks County, PAPA647,828142,325−15%

24Oakland County, MIMI1,288,337135,151−13%

25▲5Hennepin County, MNMN1,284,784134,452+4%

26▼1Riverside County, CACA2,544,916131,317−19%

27▼1Delaware County, PAPA580,937128,710−19%

28Capitol Planning Region, CTCT994,115127,894–

29▼2Monmouth County, NJNJ651,035124,081−16%

30▼2DuPage County, ILIL934,298121,296−20%

31▼2St. Louis County, MOMO990,911121,090−21%

32Palm Beach County, FLFL1,575,726120,262−9%

33▼2Wayne County, MIMI1,769,038119,192−24%

34Pinellas County, FLFL948,563117,335−17%

35▲1Dallas County, TXTX2,661,397115,742−10%

36▲1New York County, NYNY1,664,862115,392−2%

37▲3Chester County, PAPA557,116114,109−4%

38▼3Hillsborough County, FLFL1,574,115113,557−14%

39▲11Travis County, TXTX1,389,670113,524+29%

40▼7Ocean County, NJNJ673,746112,613−16%

41▲1Sacramento County, CACA1,618,460108,971−19%

42▼1Fairfax County, VAVA1,167,873108,752−11%

43▲8Wake County, NCNC1,257,235107,941+24%

44▼6Westchester County, NYNY1,015,743107,664−13%

45▼1Monroe County, NYNY750,506107,104−13%

46▲7Kings County, NYNY2,653,963105,150+24%

47▲7Bexar County, TXTX2,160,088103,929+10%

48▼1Hamilton County, OHOH838,418100,835−14%

49▲6Pima County, AZAZ1,074,68597,949−4%

50▼4Suffolk County, MAMA791,89197,778−15%

51▼2Bristol County, MAMA593,64097,598−7%

52▼13San Bernardino County, CACA2,224,09197,191−30%

53▼10Broward County, FLFL2,013,31795,217−29%

54▲5Pierce County, WAWA946,28894,828−7%

55▼10Bergen County, NJNJ977,02694,439−24%

56▲1Jefferson County, KYKY795,22293,820−9%

57▲7Multnomah County, OROR795,39192,031+6%

58▼10Will County, ILIL712,25390,437−27%

59▼3Alameda County, CACA1,636,63089,627−7%

60▼8Baltimore County, MDMD847,65089,170−24%

61▲17Lee County, FLFL875,60788,261+12%

62▲10Mecklenburg County, NCNC1,233,38387,695+13%

63▲6Orange County, FLFL1,528,00287,396−8%

64▲1Johnson County, KSKS636,90686,670−3%

65▲1Morris County, NJNJ524,25186,491−14%

66▲14Collin County, TXTX1,297,17986,151+10%

67▲17Duval County, FLFL1,062,96386,073−5%

68▲15New Castle County, DEDE588,02685,505−16%

69▼7Santa Clara County, CACA1,914,39185,120−18%

70▼3Hillsborough County, NHNH433,41584,681−7%

71▼11Contra Costa County, CACA1,170,07084,598−16%

72▼4Queens County, NYNY2,358,18284,576−20%

73Western Connecticut Planning Region, CTCT640,48284,321–

74▼11Macomb County, MIMI886,22183,865−16%

75▼14Onondaga County, NYNY466,58483,576−23%

76▲13El Paso County, COCO757,04083,422+5%

77▼19Camden County, NJNJ535,79983,033−22%

78▼1Brevard County, FLFL663,98282,849−2%

79▼9Burlington County, NJNJ481,43982,226−17%

80▲10Denton County, TXTX1,069,34682,159+10%

81▼8Providence County, RIRI678,17981,758−18%

82▲10Denver County, COCO740,61381,438+40%

83▼12Montgomery County, MDMD1,074,58281,318−10%

84South Central Connecticut Planning Region, CTCT578,74180,855–

85Rockingham County, NHNH324,07778,9170%

86▼12Anne Arundel County, MDMD603,38078,429−20%

87▼5Douglas County, NENE606,46077,702−9%

88▼13Marion County, ININ992,19677,587−26%

89▼13Snohomish County, WAWA870,65677,585−11%

90▼3Jefferson County, COCO580,45177,379−7%

91▲12Salt Lake County, UTUT1,220,91676,682+23%

92▼13Gloucester County, NJNJ312,63875,215−7%

93▲1Dane County, WIWI590,37574,465+7%

94▼13Jackson County, MOMO732,99472,890−10%

95▼2Summit County, OHOH538,37671,812−14%

96▼8Lake County, ILIL719,33971,697−20%

97▼2Spokane County, WAWA558,34471,0740%

98▼12Milwaukee County, WIWI924,21670,714−17%

99▲1Arapahoe County, COCO673,82067,961+7%

100▼9Middlesex County, NJNJ883,33567,764−23%

101▲8Fulton County, GAGA1,098,79167,610+21%

102▼3Tulsa County, OKOK698,78267,431−8%

103▲4Polk County, IAIA516,54666,949+4%

104▼3St. Charles County, MOMO426,49966,607−1%

105Oklahoma County, OKOK822,12565,941−15%

106▼4Ventura County, CACA830,85165,367−14%

107▼9San Francisco County, CACA826,07963,331−2%

108▲3Montgomery County, OHOH539,59863,324−8%

109▼13Pasco County, FLFL674,51662,725−17%

110▲15Volusia County, FLFL606,57361,442−14%

111▼7Kent County, MIMI675,23261,057−15%

112▲1Cobb County, GAGA793,34560,324−4%

113▼16Hampden County, MAMA464,33860,307−25%

114▼8Albany County, NYNY321,22559,987−18%

115Naugatuck Valley Planning Region, CTCT463,34959,756–

116▲4Lancaster County, PAPA563,15959,328+2%

117▼9Sonoma County, CACA486,44459,215−9%

118▲20Ada County, IDID546,14159,205+32%

119▼5Cumberland County, MEME317,22259,1600%

120▼4Barnstable County, MAMA233,53958,418−1%

121▼11Westmoreland County, PAPA349,32457,846−12%

122▼4Ramsey County, MNMN541,62357,560−13%

123▲3Davidson County, TNTN745,90457,504−1%

124▲18Sarasota County, FLFL479,95857,212−2%

125▼8Montgomery County, TXTX781,19456,766+8%

126▲19Williamson County, TXTX752,82755,791+28%

127▼5York County, PAPA473,19755,7640%

128▲18District of Columbia, DCDC693,64555,299+40%

129▲8Greenville County, SCSC583,12555,264+18%

130▼15Washington County, OROR611,70855,228−12%

131▼19Kane County, ILIL525,75755,202−16%

132▲15Washoe County, NVNV509,38654,1550%

133▼9Saratoga County, NYNY241,34353,845+3%

134▼4Polk County, FLFL874,79053,695−16%

135▼8Orange County, NYNY417,66953,549−29%

136Sedgwick County, KSKS538,43352,937−16%

137▼4Clark County, WAWA532,11952,909−3%

138▼6Dakota County, MNMN457,71052,637−9%

139▲4Bernalillo County, NMNM667,60152,606−4%

140▼19Luzerne County, PAPA332,12652,537−18%

141▼22Dutchess County, NYNY300,70851,958−27%

142▼14Waukesha County, WIWI417,21050,482−11%

143▲6Manatee County, FLFL468,20050,411+14%

144▲13Douglas County, COCO399,39649,813+9%

145▲10Clackamas County, OROR426,28049,733+1%

146▲2Knox County, TNTN511,45349,646−5%

147▼13McHenry County, ILIL317,75149,359−14%

148▼25San Mateo County, CACA743,56849,306−19%

149▼5Lane County, OROR381,58449,206+3%

150▼9Lake County, ININ504,61249,122−11%

151▼20Stark County, OHOH373,77148,744−17%

152▲1Virginia Beach, VAVA453,73748,607−10%

153▼13Lucas County, OHOH423,34748,084−18%

154▼15Seminole County, FLFL491,88447,993−10%

155▼5Shelby County, TNTN910,22647,774−27%

156▼27Lackawanna County, PAPA216,50247,387−19%

157▼1Butler County, OHOH400,12847,247−5%

158▼4Larimer County, COCO377,29246,990+8%

159▼8Fresno County, CACA1,035,45646,283−12%

160▲2Essex County, NJNJ896,37946,269−13%

161▲3Placer County, CACA442,08146,252−12%

162▲11Horry County, SCSC427,55145,829+33%

163▲29Charleston County, SCSC436,20044,521+28%

164▲5Genesee County, MIMI401,09344,446−7%

165▲7Collier County, FLFL417,13144,211+12%

166▲1Lake County, FLFL456,06844,184+20%

167▼2Adams County, COCO554,66844,168+9%

168▼16Gwinnett County, GAGA1,018,09943,993−27%

169▼8Kern County, CACA927,06843,877−31%

170▼35Richmond County, NYNY501,29043,684−33%

171▼13Lorain County, OHOH323,21943,573−13%

172▼13Berks County, PAPA440,07243,526−17%

173▲26Pinal County, AZAZ539,38043,411+24%

174▲8Hudson County, NJNJ735,03343,261−8%

175▼4Atlantic County, NJNJ278,65743,232−12%

176▲15Sussex County, DEDE277,14042,841+26%

177▲1Marion County, FLFL442,66042,749+1%

178▲11Honolulu County, HIHI988,70342,306+3%

179▲14Hamilton County, TNTN390,83342,009+14%

180▼10Loudoun County, VAVA449,74941,835+8%

181▼6Hamilton County, ININ387,03641,728+9%

182▲48St. Johns County, FLFL346,32841,710+47%

183▲5Boulder County, COCO328,56041,601+2%

184Southeastern Connecticut Planning Region, CTCT284,01541,231–

185▲5York County, MEME222,43440,875+7%

186▼26Union County, NJNJ601,86340,867−22%

187Greater Bridgeport Planning Region, CTCT337,69740,214–

188▼14Lake County, OHOH232,21740,155−7%

189▼10Harford County, MDMD266,44639,224−18%

190▼7Lehigh County, PAPA384,38337,984−11%

191▼14Rensselaer County, NYNY160,51037,946−13%

192▼6Washtenaw County, MIMI370,21437,837−8%

193▼13Mercer County, NJNJ399,28937,770−21%

194Butler County, PAPA200,16937,715−5%

195▼11Somerset County, NJNJ356,48637,666−12%

196▼9Anoka County, MNMN381,60537,525−2%

197▼21Northampton County, PAPA324,41137,210−14%

198▲8Frederick County, MDMD302,88337,104−7%

199▼33San Joaquin County, CACA823,81537,093−20%

200Lancaster County, NENE334,04937,079−5%

201▼33Jefferson County, ALAL665,74236,920−31%

202▲24Fort Bend County, TXTX975,19136,795+17%

203▲8Miami-Dade County, FLFL2,802,02936,637−19%

204Madison County, ALAL433,51636,598+5%

205▲35Utah County, UTUT759,85936,384+54%

206▼5Allen County, ININ402,32936,162−10%

207▼12Prince William County, VAVA502,96635,900−11%

208▼12Kitsap County, WAWA283,37435,8000%

209▲12St. Tammany Parish, LALA279,10835,773+14%

210▲34Greene County, MOMO309,28635,752−7%

211▼3San Luis Obispo County, CACA282,36735,627+8%

212▲30Escambia County, FLFL333,83435,576−1%

213▼50Erie County, PAPA265,83235,471−29%

214▼11Fayette County, KYKY329,75135,439−9%

215▲7Yavapai County, AZAZ252,55235,400+6%

216▼6Madison County, ILIL263,11035,256−12%

217▼36Kent County, RIRI173,49535,245−21%

218▼4Cumberland County, PAPA277,27034,946−4%

219▼14Thurston County, WAWA304,26134,942+8%

220▼35Rockland County, NYNY357,39734,358−28%

221▼3Howard County, MDMD339,18334,174−12%

222▲5Marin County, CACA253,69434,173−9%

223Lower Connecticut River Valley Planning Region, CTCT177,31134,115–

224▼1Oneida County, NYNY226,39233,992−26%

225▼18Washington County, PAPA210,80233,961−13%

226▲8Guilford County, NCNC562,23433,960−3%

227▲21Cherokee County, GAGA299,27333,952+1%

228▼26Broome County, NYNY195,73633,927−23%

229▲8Washington County, MNMN286,89533,890−2%

230▲5Weld County, COCO378,42633,843+18%

231▲38York County, SCSC306,88733,804+28%

232▲1DeKalb County, GAGA774,39433,554−1%

233▼14Winnebago County, ILIL283,67433,521−16%

234▼22Jefferson County, MOMO233,13233,468−17%

235▼20Baltimore, MDMD569,99733,221−16%

236▼20Stanislaus County, CACA557,71933,219−27%

237▲1St. Joseph County, ININ272,86133,133−20%

238▲1Delaware County, OHOH242,03233,038+22%

239▼7Clay County, MOMO265,03232,831−14%

240▲21Chesterfield County, VAVA397,14832,443−5%

241▼44Ulster County, NYNY183,33032,235−16%

242▼14Linn County, IAIA232,02832,213−15%

243▲11Arlington County, VAVA243,93132,058+21%

244▼24Santa Barbara County, CACA442,06531,890−18%

245▲8Lexington County, SCSC317,58831,819+6%

246▼29Mahoning County, OHOH224,70631,524−21%

247▲20Merrimack County, NHNH158,07831,430+5%

248▼23Niagara County, NYNY208,91231,251−21%

249▼40Passaic County, NJNJ531,62431,237−33%

250▼1Chittenden County, VTVT169,11531,108+5%

251▲20Dauphin County, PAPA293,35131,092−4%

252▲22Spartanburg County, SCSC380,85731,072+7%

253▼17Jefferson Parish, LALA431,39831,006−17%

254▼56Mobile County, ALAL411,65830,992−27%

255▲44New Hanover County, NCNC245,95930,919+22%

256▼11Sussex County, NJNJ148,06330,885−24%

257▼16Cleveland County, OKOK303,97330,857−15%

258▼11Carroll County, MDMD176,67730,819−3%

259▼28Washington County, RIRI129,79530,807−13%

260▼36Warren County, OHOH257,18130,624+5%

261▲1Forsyth County, NCNC401,71830,363+2%

262▼19Galveston County, TXTX372,20730,308−5%

263▲20Williamson County, TNTN272,06130,305+17%

264▼18Marion County, OROR355,77729,840−12%

265▼13Rutherford County, TNTN386,35229,707+5%

266▼37Ingham County, MIMI289,70929,394−19%

267▼54St. Lucie County, FLFL402,44929,244−15%

268▲2Deschutes County, OROR213,07229,237+23%

269▼9Clermont County, OHOH216,97729,102−18%

270▼20Medina County, OHOH185,02529,056−7%

271▼5Livingston County, MIMI197,31529,046−9%

272▲5Beaver County, PAPA166,03229,040−11%

273▼22Pulaski County, ARAR404,61128,995−23%

274▼19Hampshire County, MAMA164,06528,994−17%

275▲1Strafford County, NHNH135,04328,611+19%

276▼20Solano County, CACA455,37628,459−16%

277▲3Anchorage, AKAK287,15528,313−21%

278▼15Kenton County, KYKY175,77928,283−10%

279▼22Chatham County, GAGA311,85528,272+13%

280▼2Buncombe County, NCNC277,41728,231−7%

281▼22St. Louis, MOMO278,14428,177−11%

282▼18Santa Cruz County, CACA258,85227,862−7%

283▼25Kalamazoo County, MIMI263,79527,440−17%

284▲33Charlotte County, FLFL217,21227,117+13%

285▼20Onslow County, NCNC217,17527,085−2%

286▲15Alachua County, FLFL290,02826,915−4%

287▲35Santa Rosa County, FLFL211,11526,886+11%

288▼13Scott County, IAIA175,25926,830+1%

289▼7Brazoria County, TXTX419,08026,662−9%

290▲7Mohave County, AZAZ228,10226,537−18%

291▲44Benton County, ARAR332,55425,977+4%

292▼4Porter County, ININ176,04925,970−14%

293▼7Hernando County, FLFL221,70125,957−16%

294▼15Jackson County, OROR221,79525,790−9%

295▲35Baldwin County, ALAL267,76125,709+15%

296▼28Cape May County, NJNJ93,39025,693−15%

297▼16Bell County, TXTX402,24825,665+28%

298▲5Hunterdon County, NJNJ131,78125,647−15%

299▼7Henrico County, VAVA342,77525,578−17%

300▼9Brown County, WIWI275,80325,5130%

301▲4Leon County, FLFL299,04825,316−17%

302▼30Schenectady County, NYNY162,58125,184−6%

303▲4East Baton Rouge Parish, LALA456,18024,985−16%

304▼8Okaloosa County, FLFL221,81024,763+9%

305▼12McLean County, ILIL171,41924,673−4%

306▲38El Dorado County, CACA192,32324,585−7%

307▲17Berkshire County, MAMA128,22424,567−20%

308▼19Ottawa County, MIMI308,45924,567−3%

309▼3St. Clair County, ILIL250,70824,556−17%

310▲21Richland County, SCSC434,95624,463−13%

311▼9Forsyth County, GAGA282,80524,441+5%

312▼4Sarpy County, NENE208,30324,425−8%

313▼19Clay County, FLFL239,59324,244−12%

314▼16Sangamon County, ILIL194,17024,126−17%

315▲21Chesapeake, VAVA255,33224,081+2%

316▼4Monroe County, PAPA167,17924,037−16%

317▼33Martin County, FLFL166,27223,995+2%

318▲41Durham County, NCNC347,24023,965+29%

319▲47Berkeley County, SCSC274,66623,945+46%

320▼11Beaufort County, SCSC204,43323,921+15%

321▼36Licking County, OHOH185,56423,864−9%

322▼3Cumberland County, NCNC338,47323,854−15%

323▼23Penobscot County, MEME157,96723,848−9%

324▼9Butte County, CACA209,21123,766−24%

325▼35Bronx County, NYNY1,406,33223,725−38%

326▼31Schuylkill County, PAPA145,08523,701−18%

327▲50Hays County, TXTX304,39023,562+74%

328Orleans Parish, LALA362,15423,557+42%

329▼4Union County, NCNC267,67423,548+5%

330▲32Anderson County, SCSC219,93023,513−6%

331▲1Indian River County, FLFL172,79923,348−3%

332▼5Boone County, MOMO191,74623,2470%

333▼22Prince George's County, MDMD970,37423,192−26%

334▲7Whatcom County, WAWA236,39223,089−8%

335▲66Brunswick County, NCNC174,70222,864+64%

336▼32Kent County, DEDE194,78622,815−6%

337▼21Jackson County, MIMI159,55222,808−7%

338▲19Johnson County, IAIA160,04422,790+2%

339▼25McLennan County, TXTX272,02022,749−12%

340▲18Montgomery County, TNTN249,93522,732+19%

341▲4Davis County, UTUT381,22722,697+21%

342▲1Trumbull County, OHOH198,97222,643−26%

343▼10Lubbock County, TXTX328,90622,503−14%

344▲24Yellowstone County, MTMT172,69222,364+11%

345▲6Centre County, PAPA157,39322,346+10%

346▼26Greene County, OHOH174,32222,258+7%

347▼74Portage County, OHOH163,40422,256−19%

348▼61Washington County, ARAR271,21322,173−23%

349▼36Shelby County, ALAL238,55222,135−15%

350▼13Citrus County, FLFL171,66622,135−3%

351▲10Monterey County, CACA433,72921,836−22%

352▲2Kootenai County, IDID191,86421,825+6%

353▼24Peoria County, ILIL178,55321,667−21%

354▼36Rock County, WIWI166,47221,418−14%

355▲15Sumter County, FLFL157,77221,343+53%

356▼46Oswego County, NYNY118,56921,309−24%

357Northwest Hills Planning Region, CTCT114,69021,184–

358▼37Cambria County, PAPA128,96821,064−21%

359▲44Canyon County, IDID275,12320,792+29%

360▼8Shasta County, CACA181,64820,645−25%

361▼23Minnehaha County, SDSD212,69120,643+7%

362▼14St. Clair County, MIMI160,48620,608−17%

363▼16Blair County, PAPA119,54120,597−19%

364▼24Benton County, WAWA221,72220,536−2%

365▼19Bay County, FLFL204,47920,511−13%

366▼13Kanawha County, WVWV172,38120,442−25%

367▲11Johnston County, NCNC256,44820,208+31%

368▲5Iredell County, NCNC211,79820,197+19%

369▲7Ontario County, NYNY113,13020,167−9%

370▲26Osceola County, FLFL481,71820,162+3%

371Sullivan County, TNTN163,75920,158+2%

372▼38Fayette County, PAPA123,02119,973−16%

373▲33Shawnee County, KSKS178,60719,934−20%

374▼2Newport County, RIRI83,05119,897−6%

375▼6Mesa County, COCO162,84519,842−3%

376▼11Kennebec County, MEME129,06719,717−5%

377▲23Tulare County, CACA485,14619,673−5%

378▼39Boone County, KYKY145,31619,560−9%

379▲9Outagamie County, WIWI195,89419,533−8%

380▲58Richmond, VAVA237,25719,430+47%

381▼39Fairfield County, OHOH169,75219,337−17%

382▲45Hendricks County, ININ193,51019,248−10%

383▼28Racine County, WIWI198,91919,207+1%

384▼21Dubuque County, IAIA99,38119,172−11%

385▼25El Paso County, TXTX877,85818,967−1%

386▼36Vanderburgh County, ININ181,99518,956−9%

387▼38Tippecanoe County, ININ190,45618,797−20%

388▲21Yolo County, CACA224,41018,768+2%

389▼66Champaign County, ILIL209,97218,768−22%

390▼64Warren County, NJNJ112,95318,691−19%

391▲39Nueces County, TXTX352,99218,536−8%

392▼7Missoula County, MTMT123,51318,446−3%

393▼6Brazos County, TXTX249,08818,291+9%

394▼2Jefferson County, NYNY111,54018,287−21%

395▼14St. Louis County, MNMN200,51818,282−12%

396▲14Harrison County, MSMS217,13618,188−18%

397▲10Gaston County, NCNC246,55818,151−9%

398▼31Norfolk, VAVA231,01318,085−3%

399▼20Saginaw County, MIMI187,68818,050−12%

400▼26Kenosha County, WIWI168,44818,021−17%

401▲11Weber County, UTUT278,17417,989+48%

402▼16Monroe County, MIMI156,00417,887−23%

403▼5Smith County, TXTX252,54917,810−30%

404▲90Rankin County, MSMS162,18117,703−8%

405▼8Alexandria, VAVA160,66217,676+12%

406▼7Berkeley County, WVWV139,52217,579+18%

407▼32Sumner County, TNTN215,53817,537−21%

408▲18Paulding County, GAGA190,99617,518−12%

409▲7Washington County, MDMD157,73117,512−15%

410▼46LaSalle County, ILIL107,77317,477−19%

411▼31Clark County, OHOH135,34017,429−17%

412▲13Spotsylvania County, VAVA155,38817,419+4%

413▲53Canadian County, OKOK187,18917,346+14%

414▼23Winnebago County, WIWI174,21817,3440%

415▼59Putnam County, NYNY99,02817,290−37%

416▲5Cabarrus County, NCNC249,72517,269+8%

417▼33Cecil County, MDMD107,13117,250−20%

418▲50Pickens County, SCSC139,19817,205+14%

419▲5Douglas County, KSKS120,92017,185−3%

420▲60Comal County, TXTX209,16617,109+39%

421▲2Tazewell County, ILIL130,04916,978−12%

422▲22Gallatin County, MTMT128,74016,974+7%

423▲13Columbiana County, OHOH99,37716,960−12%

424▼20Johnson County, ININ174,26216,878−21%

425▼42Hall County, GAGA226,56816,790−9%

426▲19Ellis County, TXTX240,86716,775+4%

427▼14Franklin County, PAPA160,65216,760−11%

428▲30Tuscaloosa County, ALAL241,36816,728−6%

429▲45Davidson County, NCNC180,18216,651+13%

430▲53Parker County, TXTX184,76716,539+8%

431▲4Androscoggin County, MEME116,48716,518−1%

432▲100Dallas County, IAIA118,45716,516+68%

433▲1Clark County, ININ130,45116,479+2%

434▼26Cayuga County, NYNY74,36516,391−16%

435▼53Kendall County, ILIL145,47016,387−3%

436▼43Olmsted County, MNMN166,73116,304+5%

437▼35Monroe County, ININ143,34516,286−10%

438▼19La Crosse County, WIWI121,33916,264+4%

439▼28Scott County, MNMN159,01716,221−3%

440▼50Mercer County, PAPA107,86015,873−20%

441▼4St. Lawrence County, NYNY105,48815,872−20%

442▲48Blount County, TNTN143,82015,871−12%

443▲3Humboldt County, CACA131,64715,869−11%

444▼39Berrien County, MIMI152,44415,856−22%

445▲7Grayson County, TXTX153,61315,838−6%

446▲7Washington County, UTUT213,67015,824+31%

447▲20Grafton County, NHNH93,22515,745−5%

448▼30Wilson County, TNTN175,03315,648+22%

449▲32Lee County, ALAL189,88115,643−4%

450▲10Washington County, TNTN141,19915,497+14%

451▲19Jasper County, MOMO127,42815,4660%

452▼35Livingston Parish, LALA155,03615,402−5%

453▼10DeKalb County, ILIL101,83515,331−16%

454▲148Johnson County, TXTX218,04815,312−35%

455▲6Pennington County, SDSD116,79215,297+9%

456▼7Washington County, WIWI139,23815,2710%

457▲38Linn County, OROR132,84315,227+5%

458▲43Guadalupe County, TXTX201,11115,216+32%

459▼65Rock Island County, ILIL141,86915,197−28%

460▼9Lawrence County, PAPA83,91115,159−5%

461▲14Saline County, ARAR133,28815,122+14%

462▼73Wood County, OHOH134,17615,095−16%

463▼49Aiken County, SCSC181,51515,081+11%

464▼44Chautauqua County, NYNY124,12614,991−26%

465▼34Orange County, NCNC152,49814,960−3%

466▼33Lycoming County, PAPA112,58714,938−13%

467▼28Franklin County, MOMO108,09014,885−7%

468▲5Wright County, MNMN157,55914,883+2%

469▼40Black Hawk County, IAIA131,53214,868−17%

470▼42Steuben County, NYNY91,85514,860−25%

471▲26Skagit County, WAWA132,97514,819+13%

472▼50DeSoto County, MSMS197,91814,812−28%

473▲81Flagler County, FLFL140,36014,736+17%

474▼79St. Mary's County, MDMD116,69214,732−17%

475▲9Flathead County, MTMT115,42914,715+11%

476▲61Belknap County, NHNH65,14714,689+18%

477▼14Muskegon County, MIMI177,90114,676−21%

478▼28Cass County, NDND201,79414,661+11%

479▼38Pueblo County, COCO169,27714,578−8%

480▼24Platte County, MOMO114,40014,487+2%

481▲32Geauga County, OHOH95,67614,471−10%

482▼35Campbell County, KYKY95,44114,448−12%

483▲4Henderson County, NCNC122,37514,404+5%

484▲16Lafayette Parish, LALA257,94914,397+20%

485▼28LaPorte County, ININ111,29414,378−15%

486▼44Stafford County, VAVA170,80314,357−1%

487▼18Walworth County, WIWI106,12714,109−10%

488▼56Dorchester County, SCSC178,39714,037−3%

489▼7Cass County, MOMO115,85913,900−11%

490▼4Lebanon County, PAPA146,38013,886−9%

491▲57Nevada County, CACA101,91113,878−22%

492▲16Ashtabula County, OHOH96,71313,860−14%

493▼16Warren County, NYNY65,02013,847−11%

494▼40Eaton County, MIMI109,58113,842−13%

495▼7Yakima County, WAWA259,18513,793−21%

496▲127Sebastian County, ARAR130,64113,774−22%

497▲34Richland County, OHOH124,89313,680−19%

498Grand Traverse County, MIMI96,72913,672+7%

499▲110Albemarle County, VAVA118,35613,671+12%

500▲25Madison County, ININ135,08813,635−10%

SHOWING 1–500 OF 3,144

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Download CSV (full list, 3,144 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES

Frequently asked

Which county has the highest irish population?

Cook County, Illinois ranks #1 with 432,999 (2024 American Community Survey).

What are the top 5 counties by irish population?

Cook County, Illinois, Maricopa County, Arizona, Los Angeles County, California, Middlesex County, Massachusetts, San Diego County, California.

How many counties are in this ranking?

3,144 counties qualify after filtering for population minimums and data availability. The ranking covers 2024 ACS 5-year data.

How is irish population measured?

Number of residents who are Irish ancestry (Ancestry, ACS detailed tables). Source: US Census Bureau, American Community Survey 5-year estimates (2024).