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.

Irish Americans: full group profile →

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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%

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

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

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

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

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

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

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

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

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

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

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

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

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

18Erie County, NYNY946,741149,073−9%

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

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

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

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

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

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

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

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

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

28Capitol Planning Region, CTCT994,115127,894–

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

49Pima County, AZAZ1,074,68597,949−4%

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

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

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

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

54Pierce County, WAWA946,28894,828−7%

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

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

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

58Will County, ILIL712,25390,437−27%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

85Rockingham County, NHNH324,07778,917−0%

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

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

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

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

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

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

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

93Dane County, WIWI590,37574,465+7%

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

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

96Lake County, ILIL719,33971,697−20%

97Spokane County, WAWA558,34471,074+0%

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

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

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

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

102Tulsa County, OKOK698,78267,431−8%

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

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

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

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

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

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

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

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

111Kent County, MIMI675,23261,057−15%

112Cobb County, GAGA793,34560,324−4%

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

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

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

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

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

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

119Cumberland County, MEME317,22259,160−0%

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

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

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

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

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

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

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

127York County, PAPA473,19755,764−0%

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

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

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

131Kane County, ILIL525,75755,202−16%

132Washoe County, NVNV509,38654,155−0%

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

134Polk County, FLFL874,79053,695−16%

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

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

137Clark County, WAWA532,11952,909−3%

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

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

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

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

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

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

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

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

146Knox County, TNTN511,45349,646−5%

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

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

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

150Lake County, ININ504,61249,122−11%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

169Kern County, CACA927,06843,877−31%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

188Lake County, OHOH232,21740,155−7%

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

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

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

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

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

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

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

196Anoka County, MNMN381,60537,525−2%

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

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

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

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

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

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

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

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

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

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

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

208Kitsap County, WAWA283,37435,800+0%

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

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

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

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

213Erie County, PAPA265,83235,471−29%

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

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

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

217Kent County, RIRI173,49535,245−21%

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

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

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

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

222Marin County, CACA253,69434,173−9%

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

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

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

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

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

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

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

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

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

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

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

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

235Baltimore, MDMD569,99733,221−16%

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

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

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

239Clay County, MOMO265,03232,831−14%

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

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

242Linn County, IAIA232,02832,213−15%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

277Anchorage, AKAK287,15528,313−21%

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

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

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

281St. Louis, MOMO278,14428,177−11%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

300Brown County, WIWI275,80325,513−0%

301Leon County, FLFL299,04825,316−17%

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

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

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

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

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

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

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

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

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

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

312Sarpy County, NENE208,30324,425−8%

313Clay County, FLFL239,59324,244−12%

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

315Chesapeake, VAVA255,33224,081+2%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

332Boone County, MOMO191,74623,247+0%

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

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

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

336Kent County, DEDE194,78622,815−6%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

354Rock County, WIWI166,47221,418−14%

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

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

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

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

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

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

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

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

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

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

365Bay County, FLFL204,47920,511−13%

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

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

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

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

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

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

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

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

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

375Mesa County, COCO162,84519,842−3%

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

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

378Boone County, KYKY145,31619,560−9%

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

380Richmond, VAVA237,25719,430+47%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

398Norfolk, VAVA231,01318,085−3%

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

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

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

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

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

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

405Alexandria, VAVA160,66217,676+12%

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

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

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

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

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

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

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

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

414Winnebago County, WIWI174,21817,344−0%

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

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

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

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

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

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

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

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

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

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

425Hall County, GAGA226,56816,790−9%

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

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

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

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

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

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

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

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

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

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

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

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

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

439Scott County, MNMN159,01716,221−3%

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

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

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

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

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

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

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

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

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

449Lee County, ALAL189,88115,643−4%

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

451Jasper County, MOMO127,42815,466+0%

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

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

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

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

456Washington County, WIWI139,23815,271+0%

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

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

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

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

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

462Wood County, OHOH134,17615,095−16%

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

489Cass County, MOMO115,85913,900−11%

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

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

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

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

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

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

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

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

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

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

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

SHOWING 1–500 OF 3,144

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Download CSV (full list, 3,144 rows)

UPDATED 2026-07-15 · 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).