RANKING · 2010 CENSUS · 500 SHOWN OF 3,076

Largest Italian population, US counties · 2010

US counties ranked by the number of residents who are Italian ancestry, from the 2010 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. Suffolk County, New York leads at 427,649. 3,076 counties qualify in total. New York carries 8 of the top 25 entries. The median across all 3,076 is 489.

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SAME RANKING BYCities States Metros

RELATEDLargest American population Highest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share

YEAR2010 2020 2024

RANKPLACESTATEPOPITALIAN POPULATIONVS –

USUnited States5.7% of US population308,745,53817,566,693–

01Suffolk County, NYNY1,546,090427,649–

02Cook County, ILIL5,194,625306,814–

03Nassau County, NYNY1,398,939305,737–

04Los Angeles County, CACA9,694,934275,862–

05Middlesex County, MAMA1,669,979238,986–

06Allegheny County, PAPA1,225,035204,475–

07Maricopa County, AZAZ4,689,558189,959–

08Westchester County, NYNY1,015,743183,778–

09Bergen County, NJNJ977,026177,942–

10Queens County, NYNY2,358,182159,786–

11Richmond County, NYNY501,290156,280–

12Monmouth County, NJNJ651,035153,390–

13Kings County, NYNY2,653,963152,768–

14Erie County, NYNY946,741152,600–

15Ocean County, NJNJ673,746151,468–

16San Diego County, CACA3,282,248144,319–

17Broward County, FLFL2,013,317142,546–

18Monroe County, NYNY750,506140,570–

19Orange County, CACA3,149,507133,300–

20Essex County, MAMA826,653125,545–

21Philadelphia County, PAPA1,574,281125,061–

22Montgomery County, PAPA877,643124,035–

23Palm Beach County, FLFL1,575,726122,472–

24Clark County, NVNV2,407,226119,663–

25Cuyahoga County, OHOH1,232,925118,419–

26Providence County, RIRI678,179116,481–

27Morris County, NJNJ524,251114,229–

28Worcester County, MAMA888,502113,873–

29Middlesex County, NJNJ883,335110,743–

30DuPage County, ILIL934,298110,151–

31Macomb County, MIMI886,221109,311–

32Norfolk County, MAMA739,749102,868–

33Delaware County, PAPA580,937100,906–

34New York County, NYNY1,664,86298,517–

35Bucks County, PAPA647,82898,460–

36Camden County, NJNJ535,79989,277–

37Riverside County, CACA2,544,91682,693–

38Onondaga County, NYNY466,58482,451–

39Pinellas County, FLFL948,56382,000–

40Essex County, NJNJ896,37981,977–

41Hillsborough County, FLFL1,574,11580,515–

42Santa Clara County, CACA1,914,39180,459–

43Wayne County, MIMI1,769,03880,023–

44Burlington County, NJNJ481,43979,764–

45Plymouth County, MAMA546,82977,685–

46Chester County, PAPA557,11676,621–

47Gloucester County, NJNJ312,63875,678–

48Oakland County, MIMI1,288,33774,894–

49Harris County, TXTX5,045,02673,987–

50Will County, ILIL712,25373,903–

51Passaic County, NJNJ531,62473,824–

52Suffolk County, MAMA791,89173,599–

53Westmoreland County, PAPA349,32473,381–

54San Bernardino County, CACA2,224,09172,670–

55King County, WAWA2,344,93971,250–

56Sacramento County, CACA1,618,46070,561–

57Dutchess County, NYNY300,70869,304–

58Orange County, NYNY417,66967,312–

59Union County, NJNJ601,86363,907–

60Franklin County, OHOH1,361,53663,242–

61Orange County, FLFL1,528,00263,010–

62Contra Costa County, CACA1,170,07062,794–

63New Castle County, DEDE588,02662,330–

64Baltimore County, MDMD847,65059,028–

65Bronx County, NYNY1,406,33257,527–

66Fairfax County, VAVA1,167,87356,230–

67Alameda County, CACA1,636,63055,129–

68Summit County, OHOH538,37654,988–

69Luzerne County, PAPA332,12654,739–

70Miami-Dade County, FLFL2,802,02954,731–

71St. Louis County, MOMO990,91154,158–

72Somerset County, NJNJ356,48652,364–

73Albany County, NYNY321,22552,340–

74Atlantic County, NJNJ278,65752,061–

75Lackawanna County, PAPA216,50251,861–

76Mercer County, NJNJ399,28951,853–

77Pasco County, FLFL674,51651,763–

78Hudson County, NJNJ735,03351,073–

79Bristol County, MAMA593,64050,571–

80Jefferson Parish, LALA431,39849,947–

81Lee County, FLFL875,60749,857–

82Hampden County, MAMA464,33849,842–

83San Mateo County, CACA743,56848,534–

84Lake County, ILIL719,33948,323–

85Oneida County, NYNY226,39247,593–

86Brevard County, FLFL663,98246,912–

87Montgomery County, MDMD1,074,58246,541–

88Northampton County, PAPA324,41145,169–

89Mahoning County, OHOH224,70644,626–

90Volusia County, FLFL606,57344,529–

91Wake County, NCNC1,257,23544,365–

92Rockland County, NYNY357,39744,304–

93Sonoma County, CACA486,44444,152–

94Pima County, AZAZ1,074,68543,828–

95Rockingham County, NHNH324,07743,614–

96Tarrant County, TXTX2,248,46641,676–

97Hillsborough County, NHNH433,41541,365–

98Berks County, PAPA440,07241,255–

99Niagara County, NYNY208,91241,045–

100Ventura County, CACA830,85141,025–

101Mecklenburg County, NCNC1,233,38340,415–

102Washington County, PAPA210,80239,403–

103Anne Arundel County, MDMD603,38039,174–

104Erie County, PAPA265,83239,037–

105San Francisco County, CACA826,07938,870–

106Kent County, RIRI173,49538,754–

107Milwaukee County, WIWI924,21638,496–

108Stark County, OHOH373,77137,971–

109Lake County, OHOH232,21737,567–

110Sussex County, NJNJ148,06337,473–

111Kane County, ILIL525,75737,057–

112Hamilton County, OHOH838,41836,715–

113Dallas County, TXTX2,661,39735,994–

114Ulster County, NYNY183,33035,905–

115Jefferson County, COCO580,45135,381–

116Duval County, FLFL1,062,96334,699–

117Saratoga County, NYNY241,34334,408–

118Lehigh County, PAPA384,38333,985–

119Pierce County, WAWA946,28833,961–

120San Joaquin County, CACA823,81533,937–

121Sarasota County, FLFL479,95833,032–

122Bexar County, TXTX2,160,08832,960–

123McHenry County, ILIL317,75132,916–

124Seminole County, FLFL491,88432,491–

125Salt Lake County, UTUT1,220,91631,702–

126Fresno County, CACA1,035,45631,467–

127Putnam County, NYNY99,02831,426–

128Schenectady County, NYNY162,58130,411–

129Beaver County, PAPA166,03230,136–

130St. Tammany Parish, LALA279,10829,961–

131El Paso County, COCO757,04029,761–

132Washoe County, NVNV509,38629,620–

133Multnomah County, OROR795,39129,483–

134Collier County, FLFL417,13129,266–

135Virginia Beach, VAVA453,73729,178–

136Lancaster County, PAPA563,15929,172–

137Trumbull County, OHOH198,97229,089–

138Hennepin County, MNMN1,284,78429,022–

139Hunterdon County, NJNJ131,78128,984–

140St. Lucie County, FLFL402,44928,455–

141Monroe County, PAPA167,17928,348–

142Broome County, NYNY195,73627,706–

143Collin County, TXTX1,297,17927,273–

144Washington County, RIRI129,79527,129–

145Travis County, TXTX1,389,67027,078–

146Placer County, CACA442,08126,432–

147Cobb County, GAGA793,34526,244–

148York County, PAPA473,19725,642–

149St. Charles County, MOMO426,49925,182–

150Lorain County, OHOH323,21924,705–

151Barnstable County, MAMA233,53924,692–

152Douglas County, NENE606,46024,643–

153Lawrence County, PAPA83,91124,437–

154Butler County, PAPA200,16924,335–

155Polk County, FLFL874,79024,234–

156Snohomish County, WAWA870,65624,142–

157Harford County, MDMD266,44624,118–

158Fulton County, GAGA1,098,79124,102–

159Rensselaer County, NYNY160,51024,089–

160Arapahoe County, COCO673,82024,080–

161Denver County, COCO740,61324,012–

162Gwinnett County, GAGA1,018,09923,686–

163Cumberland County, MEME317,22223,593–

164Lake County, ININ504,61223,510–

165Waukesha County, WIWI417,21023,445–

166Cumberland County, NJNJ157,14823,253–

167Hernando County, FLFL221,70123,202–

168Marion County, ININ992,19623,155–

169Marin County, CACA253,69423,065–

170Manatee County, FLFL468,20022,812–

171Warren County, NJNJ112,95322,634–

172Spokane County, WAWA558,34422,523–

173Marion County, FLFL442,66022,336–

174Berkshire County, MAMA128,22422,209–

175Johnson County, KSKS636,90622,107–

176Bernalillo County, NMNM667,60121,921–

177Kern County, CACA927,06821,914–

178Jackson County, MOMO732,99421,878–

179Chautauqua County, NYNY124,12621,631–

180Winnebago County, ILIL283,67421,617–

181Dauphin County, PAPA293,35121,540–

182East Baton Rouge Parish, LALA456,18021,164–

183Denton County, TXTX1,069,34620,951–

184Loudoun County, VAVA449,74920,655–

185Washington County, OROR611,70820,623–

186Stanislaus County, CACA557,71920,469–

187Jefferson County, KYKY795,22219,830–

188Howard County, MDMD339,18319,620–

189Santa Barbara County, CACA442,06519,606–

190Douglas County, COCO399,39619,571–

191Fayette County, PAPA123,02119,402–

192Adams County, COCO554,66819,102–

193Shelby County, TNTN910,22619,078–

194Cape May County, NJNJ93,39018,901–

195Baltimore, MDMD569,99718,894–

196Cumberland County, PAPA277,27018,469–

197Santa Cruz County, CACA258,85218,437–

198Montgomery County, OHOH539,59818,436–

199Medina County, OHOH185,02518,275–

200Kent County, MIMI675,23218,005–

201Polk County, IAIA516,54617,969–

202Dane County, WIWI590,37517,966–

203District of Columbia, DCDC693,64517,799–

204Boulder County, COCO328,56017,713–

205Portage County, OHOH163,40417,622–

206Martin County, FLFL166,27217,564–

207Lake County, FLFL456,06817,554–

208Prince William County, VAVA502,96617,505–

209Oswego County, NYNY118,56917,452–

210Kenosha County, WIWI168,44817,178–

211Monterey County, CACA433,72917,078–

212Honolulu County, HIHI988,70316,998–

213Lucas County, OHOH423,34716,997–

214Solano County, CACA455,37616,844–

215Cambria County, PAPA128,96816,778–

216Butler County, OHOH400,12816,771–

217Ramsey County, MNMN541,62316,745–

218Frederick County, MDMD302,88316,466–

219San Luis Obispo County, CACA282,36716,261–

220Ontario County, NYNY113,13016,105–

221Clackamas County, OROR426,28015,931–

222Horry County, SCSC427,55115,851–

223Larimer County, COCO377,29215,830–

224Montgomery County, TXTX781,19415,658–

225York County, MEME222,43415,547–

226Clark County, WAWA532,11915,483–

227Madison County, ILIL263,11015,311–

228Tangipahoa Parish, LALA141,34615,215–

229Washtenaw County, MIMI370,21415,089–

230St. Johns County, FLFL346,32814,996–

231Mercer County, PAPA107,86014,996–

232Chesterfield County, VAVA397,14814,855–

233Schuylkill County, PAPA145,08514,681–

234Davidson County, TNTN745,90414,595–

235Charlotte County, FLFL217,21214,497–

236Hampshire County, MAMA164,06514,319–

237Blair County, PAPA119,54114,316–

238El Dorado County, CACA192,32314,222–

239Merrimack County, NHNH158,07814,173–

240Jefferson County, ALAL665,74214,083–

241Butte County, CACA209,21114,063–

242Prince George's County, MDMD970,37413,885–

243Pinal County, AZAZ539,38013,816–

244Lane County, OROR381,58413,783–

245Ada County, IDID546,14113,729–

246Carroll County, MDMD176,67713,692–

247Delaware County, OHOH242,03213,511–

248Wayne County, NYNY91,25013,414–

249Sussex County, DEDE277,14013,312–

250Escambia County, FLFL333,83413,286–

251Greenville County, SCSC583,12513,181–

252Chittenden County, VTVT169,11513,119–

253Alachua County, FLFL290,02813,034–

254Osceola County, FLFL481,71812,987–

255Geauga County, OHOH95,67612,920–

256Leon County, FLFL299,04812,824–

257Fort Bend County, TXTX975,19112,816–

258Pike County, PAPA62,80812,814–

259St. Louis County, MNMN200,51812,799–

260Genesee County, MIMI401,09312,619–

261Galveston County, TXTX372,20712,611–

262Guilford County, NCNC562,23412,548–

263Oklahoma County, OKOK822,12512,545–

264Charleston County, SCSC436,20012,460–

265Sangamon County, ILIL194,17012,303–

266Jefferson County, NYNY111,54012,267–

267Tulsa County, OKOK698,78212,211–

268Pueblo County, COCO169,27712,153–

269Williamson County, TXTX752,82712,128–

270Livingston County, MIMI197,31512,111–

271Hamilton County, ININ387,03612,040–

272St. Joseph County, ININ272,86112,001–

273DeKalb County, GAGA774,39411,901–

274Cayuga County, NYNY74,36511,827–

275Indian River County, FLFL172,79911,820–

276Cherokee County, GAGA299,27311,755–

277St. Louis, MOMO278,14411,732–

278Jefferson County, MOMO233,13211,660–

279Centre County, PAPA157,39311,643–

280Strafford County, NHNH135,04311,563–

281Knox County, TNTN511,45311,540–

282Mohave County, AZAZ228,10211,448–

283Clay County, MOMO265,03211,354–

284Yavapai County, AZAZ252,55211,340–

285Ashtabula County, OHOH96,71311,334–

286Citrus County, FLFL171,66611,306–

287Kent County, DEDE194,78611,302–

288Arlington County, VAVA243,93111,278–

289Ingham County, MIMI289,70911,179–

290Utah County, UTUT759,85911,155–

291Dakota County, MNMN457,71011,151–

292New Hanover County, NCNC245,95911,143–

293Henrico County, VAVA342,77511,063–

294Herkimer County, NYNY59,21911,059–

295Orleans Parish, LALA362,15411,026–

296Flagler County, FLFL140,36010,960–

297Genesee County, NYNY58,41610,950–

298Clay County, FLFL239,59310,796–

299Bristol County, RIRI50,00110,626–

300Lycoming County, PAPA112,58710,619–

301Washington County, MNMN286,89510,523–

302LaSalle County, ILIL107,77310,498–

303Cumberland County, NCNC338,47310,458–

304Warren County, OHOH257,18110,403–

305Salem County, NJNJ66,28010,387–

306Sullivan County, NYNY80,58610,317–

307Racine County, WIWI198,91910,296–

308Union County, NCNC267,67410,277–

309Indiana County, PAPA82,87810,241–

310Columbia County, NYNY60,16810,191–

311Anchorage, AKAK287,15510,155–

312Monongalia County, WVWV107,99110,155–

313Allen County, ININ402,32910,076–

314Chemung County, NYNY80,41510,020–

315Kitsap County, WAWA283,3749,980–

316Kendall County, ILIL145,4709,931–

317Onslow County, NCNC217,1759,899–

318Columbiana County, OHOH99,3779,830–

319St. Clair County, MIMI160,4869,780–

320Chesapeake, VAVA255,3329,760–

321Sedgwick County, KSKS538,4339,722–

322Shasta County, CACA181,6489,636–

323Yolo County, CACA224,4109,547–

324Forsyth County, GAGA282,8059,512–

325Porter County, ININ176,0499,415–

326Davis County, UTUT381,2279,407–

327Montgomery County, NYNY50,0469,234–

328Anoka County, MNMN381,6059,202–

329Weld County, COCO378,4269,131–

330Newport County, RIRI83,0519,077–

331Harrison County, MSMS217,1369,053–

332Jefferson County, OHOH63,5979,043–

333Humboldt County, CACA131,6478,969–

334Cecil County, MDMD107,1318,963–

335Licking County, OHOH185,5648,958–

336Greene County, NYNY47,2388,901–

337Livingston County, NYNY61,4388,844–

338Kalamazoo County, MIMI263,7958,787–

339St. Clair County, ILIL250,7088,778–

340Forsyth County, NCNC401,7188,774–

341Jackson County, OROR221,7958,730–

342Monroe County, MIMI156,0048,704–

343Fulton County, NYNY52,2168,675–

344Tompkins County, NYNY104,0478,635–

345Warren County, NYNY65,0208,622–

346York County, SCSC306,8878,612–

347Steuben County, NYNY91,8558,609–

348Marion County, OROR355,7778,508–

349Lebanon County, PAPA146,3808,486–

350Napa County, CACA132,9498,455–

351Clermont County, OHOH216,9778,369–

352Beaufort County, SCSC204,4338,358–

353Cattaraugus County, NYNY75,3908,273–

354Ascension Parish, LALA135,1058,122–

355Madison County, NYNY67,1208,119–

356Thurston County, WAWA304,2618,096–

357Whatcom County, WAWA236,3928,078–

358Lexington County, SCSC317,5888,031–

359Shelby County, ALAL238,5528,015–

360St. Lawrence County, NYNY105,4887,988–

361Madison County, ALAL433,5167,986–

362Nevada County, CACA101,9117,983–

363Fayette County, KYKY329,7517,961–

364Northumberland County, PAPA89,9207,931–

365Williamson County, TNTN272,0617,925–

366Bay County, FLFL204,4797,880–

367Brazoria County, TXTX419,0807,809–

368Buncombe County, NCNC277,4177,773–

369Richland County, SCSC434,9567,720–

370Lafayette Parish, LALA257,9497,698–

371Norfolk, VAVA231,0137,671–

372Livingston Parish, LALA155,0367,647–

373Otsego County, NYNY60,5897,609–

374Kankakee County, ILIL105,5257,527–

375Washington County, MDMD157,7317,521–

376Fairfield County, OHOH169,7527,503–

377Santa Rosa County, FLFL211,1157,500–

378El Paso County, TXTX877,8587,478–

379Sarpy County, NENE208,3037,466–

380Crawford County, PAPA81,7927,453–

381Armstrong County, PAPA63,6987,417–

382Okaloosa County, FLFL221,8107,415–

383Penobscot County, MEME157,9677,362–

384Calvert County, MDMD94,4847,349–

385Charles County, MDMD176,5937,345–

386Ottawa County, MIMI308,4597,337–

387Mobile County, ALAL411,6587,251–

388Durham County, NCNC347,2407,212–

389Deschutes County, OROR213,0727,198–

390Belmont County, OHOH64,4347,144–

391Harrison County, WVWV64,2217,137–

392Mesa County, COCO162,8457,093–

393McLean County, ILIL171,4197,045–

394Greene County, MOMO309,2867,031–

395Cabarrus County, NCNC249,7257,005–

396Tuscarawas County, OHOH92,3736,988–

397Carbon County, PAPA65,8686,865–

398Champaign County, ILIL209,9726,809–

399Elk County, PAPA29,9266,804–

400Cheshire County, NHNH78,2696,740–

401Tulare County, CACA485,1466,726–

402Clearfield County, PAPA78,1006,716–

403DeKalb County, ILIL101,8356,685–

404Rutherford County, TNTN386,3526,675–

405Rutland County, VTVT59,6536,635–

406Alexandria, VAVA160,6626,580–

407Erie County, OHOH73,2966,550–

408Peoria County, ILIL178,5536,542–

409Berrien County, MIMI152,4446,486–

410Franklin County, MAMA70,6986,481–

411Brown County, WIWI275,8036,451–

412Wayne County, PAPA51,7036,430–

413Weber County, UTUT278,1746,430–

414Iredell County, NCNC211,7986,424–

415Calcasieu Parish, LALA208,4666,408–

416Marquette County, MIMI68,0646,395–

417Franklin County, PAPA160,6526,394–

418Newport News, VAVA183,2306,379–

419Merced County, CACA297,2606,365–

420Chatham County, GAGA311,8556,344–

421Stafford County, VAVA170,8036,312–

422Kanawha County, WVWV172,3816,286–

423Kenton County, KYKY175,7796,284–

424Jefferson County, TXTX254,3216,206–

425Tippecanoe County, ININ190,4566,178–

426Seneca County, NYNY32,8836,175–

427Grundy County, ILIL54,0526,170–

428Clinton County, NYNY78,1386,104–

429Bell County, TXTX402,2486,064–

430Richmond, VAVA237,2576,021–

431Pulaski County, ARAR404,6116,019–

432Sumter County, FLFL157,7725,999–

433Mendocino County, CACA88,1225,935–

434Lancaster County, NENE334,0495,891–

435Cleveland County, OKOK303,9735,868–

436Delaware County, NYNY44,3055,867–

437Baldwin County, ALAL267,7615,864–

438Fairbanks North Star, AKAK93,9725,850–

439Spotsylvania County, VAVA155,3885,837–

440Somerset County, PAPA72,0045,830–

441Marion County, WVWV55,5845,798–

442Grafton County, NHNH93,2255,797–

443Maui County, HIHI160,5925,778–

444Spartanburg County, SCSC380,8575,775–

445Johnston County, NCNC256,4485,763–

446Washington County, NYNY59,3535,717–

447Brunswick County, NCNC174,7025,683–

448Tazewell County, ILIL130,0495,679–

449Wood County, OHOH134,1765,664–

450Washington County, WIWI139,2385,659–

451Hamilton County, TNTN390,8335,606–

452McKean County, PAPA38,9845,605–

453Walworth County, WIWI106,1275,601–

454Kootenai County, IDID191,8645,599–

455Greene County, OHOH174,3225,598–

456Saginaw County, MIMI187,6885,592–

457Columbia County, PAPA66,1935,565–

458Orleans County, NYNY39,8255,503–

459Wayne County, OHOH116,7585,444–

460Berkeley County, SCSC274,6665,420–

461Sandoval County, NMNM159,5655,411–

462Monroe County, ININ143,3455,397–

463Wicomico County, MDMD106,8995,382–

464Elkhart County, ININ208,7745,359–

465Orange County, NCNC152,4985,336–

466St. Mary's County, MDMD116,6925,300–

467Nueces County, TXTX352,9925,297–

468Caddo Parish, LALA224,2265,255–

469Rock Island County, ILIL141,8695,220–

470Brazos County, TXTX249,0885,220–

471Benton County, ARAR332,5545,172–

472Cortland County, NYNY45,8505,160–

473Jefferson County, PAPA43,2555,142–

474Berkeley County, WVWV139,5225,132–

475Fayette County, GAGA125,1565,131–

476Missoula County, MTMT123,5135,105–

477Belknap County, NHNH65,1475,090–

478Kennebec County, MEME129,0675,061–

479Washington County, ARAR271,2135,033–

480Ozaukee County, WIWI94,3465,024–

481Albemarle County, VAVA118,3565,023–

482Rock County, WIWI166,4725,017–

483St. Charles Parish, LALA50,5865,015–

484Boone County, MOMO191,7464,990–

485Benton County, WAWA221,7224,983–

486Johnson County, ININ174,2624,981–

487Paulding County, GAGA190,9964,975–

488Tioga County, NYNY47,4534,928–

489Montgomery County, TNTN249,9354,885–

490Tuolumne County, CACA53,1604,875–

491Muskegon County, MIMI177,9014,830–

492Dorchester County, SCSC178,3974,824–

493Madera County, CACA167,9274,820–

494Hancock County, WVWV27,7294,816–

495Adams County, PAPA107,5944,806–

496Cochise County, AZAZ126,3324,793–

497Coconino County, AZAZ144,3684,741–

498Androscoggin County, MEME116,4874,738–

499Henry County, GAGA264,9224,734–

500Boone County, KYKY145,3164,718–

SHOWING 1–500 OF 3,076

Download CSV (full list, 3,076 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS

Frequently asked

Which county has the highest italian population?

Suffolk County, New York ranks #1 with 427,649 (2010 Decennial Census).

What are the top 5 counties by italian population?

Suffolk County, New York, Cook County, Illinois, Nassau County, New York, Los Angeles County, California, Middlesex County, Massachusetts.

How many counties are in this ranking?

3,076 counties qualify after filtering for population minimums and data availability. The ranking covers 2010 Decennial Census data.

How is italian population measured?

Number of residents who are Italian ancestry (Ancestry, ACS detailed tables). Source: US Census Bureau, 2010 Decennial Census.