RANKING · 2010 CENSUS · 500 SHOWN OF 3,131

Most densely populated, US counties · 2010

US counties ranked by residents per square mile (2010). New York County, New York leads at 69,992. 3,131 counties qualify in total. New York carries 6 of the top 25 entries. The median across all 3,131 is 45.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

USUnited States308,745,538261–

01New York County, NYNY1,664,86269,992+3%

02Kings County, NYNY2,653,96336,103+2%

03Bronx County, NYNY1,406,33232,841+4%

04Queens County, NYNY2,358,18220,5170%

05San Francisco County, CACA826,07917,243+4%

06Hudson County, NJNJ735,03313,730+4%

07Suffolk County, MAMA791,89112,395+5%

08Philadelphia County, PAPA1,574,28111,358+1%

09District of Columbia, DCDC693,6459,844+5%

10Alexandria, VAVA160,6629,372+9%

11Richmond County, NYNY501,2908,149+6%

12Arlington County, VAVA243,9317,987+10%

13Baltimore, MDMD569,9977,671−5%

14Essex County, NJNJ896,3796,218−1%

15Falls Church, VAVA15,1596,027+19%

16Cook County, ILIL5,194,6255,497−3%

17Union County, NJNJ601,8635,221+3%

18St. Louis, MOMO278,1445,173−8%

19Nassau County, NYNY1,398,9394,7080%

20Manassas Park, VAVA16,5604,704+39%

21Norfolk, VAVA231,0134,558+4%

22Charlottesville, VAVA44,3884,244−3%

23Milwaukee County, WIWI924,2163,925+1%

24Denver County, COCO740,6133,921+8%

25Bergen County, NJNJ977,0263,888+2%

26Manassas, VAVA44,3323,842+8%

27Orange County, CACA3,149,5073,797+6%

28Fairfax, VAVA26,7723,616+5%

29Richmond, VAVA237,2573,408+3%

30Pinellas County, FLFL948,5633,348−1%

31Ramsey County, MNMN541,6233,3410%

32Delaware County, PAPA580,9373,041+1%

33Wayne County, MIMI1,769,0382,976−12%

34Portsmouth, VAVA96,7772,869−5%

35Winchester, VAVA28,2722,850+11%

36Harrisonburg, VAVA50,8392,822+21%

37Lexington, VAVA7,7692,818+3%

38Cuyahoga County, OHOH1,232,9252,800−8%

39DuPage County, ILIL934,2982,797+1%

40Fairfax County, VAVA1,167,8732,766+12%

41Dallas County, TXTX2,661,3972,712+7%

42Passaic County, NJNJ531,6242,693+2%

43Hampton, VAVA137,3152,671−6%

44Newport News, VAVA183,2302,6190%

45Middlesex County, NJNJ883,3352,619+8%

46DeKalb County, GAGA774,3942,585+4%

47Los Angeles County, CACA9,694,9342,418+3%

48Harris County, TXTX5,045,0262,397+20%

49Fredericksburg, VAVA30,3932,324+26%

50Camden County, NJNJ535,7992,320+1%

51Colonial Heights, VAVA18,7382,316+3%

52Roanoke, VAVA99,1112,282+2%

53Marion County, ININ992,1962,281+5%

54Westchester County, NYNY1,015,7432,203+3%

55Franklin County, OHOH1,361,5362,185+9%

56Hopewell, VAVA23,2612,182+1%

57Tarrant County, TXTX2,248,4662,091+25%

58Hennepin County, MNMN1,284,7842,080+3%

59Bristol County, RIRI50,0012,067−2%

60Alameda County, CACA1,636,6302,048+5%

61Orleans Parish, LALA362,1542,028−29%

62Cobb County, GAGA793,3452,026+13%

63Hamilton County, OHOH838,4181,979−5%

64Montgomery County, MDMD1,074,5821,971+11%

65St. Louis County, MOMO990,9111,966−2%

66Jefferson County, KYKY795,2221,946+7%

67Gwinnett County, GAGA1,018,0991,868+37%

68Middlesex County, MAMA1,669,9791,838+3%

69Clayton County, GAGA297,4711,830+10%

70Rockland County, NYNY357,3971,795+9%

71Virginia Beach, VAVA453,7371,790+3%

72Prince George's County, MDMD970,3741,789+8%

73Mecklenburg County, NCNC1,233,3831,756+32%

74Macomb County, MIMI886,2211,754+7%

75Fulton County, GAGA1,098,7911,748+13%

76Salem, VAVA25,8161,7090%

77Multnomah County, OROR795,3911,706+11%

78Radford, VAVA17,2431,696+3%

79Broomfield County, COCO79,1741,695–

80Norfolk County, MAMA739,7491,694+3%

81Allegheny County, PAPA1,225,0351,676−5%

82Montgomery County, PAPA877,6431,656+7%

83Suffolk County, NYNY1,546,0901,639+5%

84Mercer County, NJNJ399,2891,633+4%

85San Mateo County, CACA743,5681,602+2%

86Honolulu County, HIHI988,7031,587+9%

87Lake County, ILIL719,3391,586+9%

88Douglas County, NENE606,4601,584+12%

89Williamsburg, VAVA15,8611,574+17%

90Lynchburg, VAVA81,3471,543+16%

91Providence County, RIRI678,1791,530+1%

92Essex County, MAMA826,6531,509+3%

93Sacramento County, CACA1,618,4601,470+16%

94Contra Costa County, CACA1,170,0701,463+11%

95Broward County, FLFL2,013,3171,453+8%

96Jefferson Parish, LALA431,3981,438−5%

97Petersburg, VAVA33,7341,427−4%

98Waynesboro, VAVA23,9511,403+8%

99Oakland County, MIMI1,288,3371,386+1%

100Bristol, VAVA16,4181,386+3%

101Bexar County, TXTX2,160,0881,383+23%

102Santa Clara County, CACA1,914,3911,380+6%

103Salt Lake County, UTUT1,220,9161,368+15%

104Seminole County, FLFL491,8841,366+16%

105Monmouth County, NJNJ651,0351,346+2%

106Baltimore County, MDMD847,6501,345+7%

107Miami-Dade County, FLFL2,802,0291,314+11%

108Henrico County, VAVA342,7751,313+17%

109Summit County, OHOH538,3761,3120%

110Lucas County, OHOH423,3471,301−3%

111Anne Arundel County, MDMD603,3801,296+10%

112Orange County, FLFL1,528,0021,269+28%

113New Castle County, DEDE588,0261,263+8%

114Martinsville, VAVA13,8491,262−10%

115Davidson County, TNTN745,9041,245+10%

116Shelby County, TNTN910,2261,219+3%

117Hillsborough County, FLFL1,574,1151,202+23%

118Prince William County, VAVA502,9661,199+43%

119Staunton, VAVA26,8011,1920%

120Montgomery County, OHOH539,5981,160−4%

121Johnson County, KSKS636,9061,149+21%

122Howard County, MDMD339,1831,144+16%

123Duval County, FLFL1,062,9631,133+11%

124Monroe County, NYNY750,5061,133+1%

125Jackson County, MOMO732,9941,115+3%

126Covington, VAVA5,6801,090−5%

127Wake County, NCNC1,257,2351,080+44%

128Somerset County, NJNJ356,4861,071+9%

129Morris County, NJNJ524,2511,068+5%

130Tulsa County, OKOK698,7821,058+7%

131New Hanover County, NCNC245,9591,054+26%

132Fayette County, KYKY329,7511,042+14%

133Wyandotte County, KSKS170,5971,0390%

134Franklin, VAVA8,4781,037+3%

135Bucks County, PAPA647,8281,035+5%

136Buena Vista, VAVA6,6721,033+5%

137Travis County, TXTX1,389,6701,030+26%

138Oklahoma County, OKOK822,1251,014+9%

139Lehigh County, PAPA384,3831,012+12%

140Danville, VAVA41,6471,006−11%

141Lake County, OHOH232,2171,003+1%

142Kenton County, KYKY175,779996+5%

143Lake County, ININ504,612994+2%

144Kane County, ILIL525,757992+28%

145Bristol County, MAMA593,640991+3%

146Kent County, RIRI173,495986−1%

147Clarke County, GAGA129,921978+15%

148East Baton Rouge Parish, LALA456,180966+7%

149Davis County, UTUT381,227944+28%

150Durham County, NCNC347,240931+20%

151Collin County, TXTX1,297,179930+59%

152Ocean County, NJNJ673,746918+13%

153King County, WAWA2,344,939913+11%

154Gloucester County, NJNJ312,638895+13%

155Erie County, NYNY946,741881−3%

156Muscogee County, GAGA202,171877+2%

157Forsyth County, NCNC401,718860+15%

158Emporia, VAVA5,447858+5%

159Galax, VAVA6,670855+3%

160Knox County, TNTN511,453850+13%

161Lafayette Parish, LALA257,949824+16%

162Will County, ILIL712,253811+35%

163Newport County, RIRI83,051809−3%

164Northampton County, PAPA324,411805+11%

165Lee County, FLFL875,607792+40%

166Poquoson, VAVA13,292791+5%

167El Paso County, TXTX877,858790+18%

168Butler County, OHOH400,128789+11%

169Anoka County, MNMN381,605784+11%

170Forsyth County, GAGA282,805781+78%

171Vanderburgh County, ININ181,995770+5%

172Galveston County, TXTX372,207768+16%

173Guilford County, NCNC562,234756+16%

174Schenectady County, NYNY162,581756+6%

175Denton County, TXTX1,069,346754+53%

176Polk County, IAIA516,546752+15%

177Plymouth County, MAMA546,829752+5%

178Hampden County, MAMA464,338751+2%

179Chesterfield County, VAVA397,148747+22%

180San Diego County, CACA3,282,248735+10%

181Washington County, OROR611,708731+19%

182Arapahoe County, COCO673,820717+17%

183Kent County, MIMI675,232710+5%

184Waukesha County, WIWI417,210709+8%

185Dakota County, MNMN457,710708+12%

186Jefferson County, COCO580,451699+1%

187Hamilton County, ININ387,036696+50%

188Sarasota County, FLFL479,958682+16%

189Fort Bend County, TXTX975,191679+65%

190Clark County, WAWA532,119677+23%

191Palm Beach County, FLFL1,575,726672+17%

192Genesee County, MIMI401,093668−2%

193Sarpy County, NENE208,303667+30%

194Chester County, PAPA557,116665+15%

195Douglas County, GAGA154,293661+44%

196Chesapeake, VAVA255,332657+12%

197Rockdale County, GAGA98,416656+22%

198Stark County, OHOH373,771653−1%

199St. Charles County, MOMO426,499643+27%

200Henry County, GAGA264,922640+71%

201Kitsap County, WAWA283,374636+8%

202York County, VAVA71,374625+16%

203Bibb County, GAGA157,556624+1%

204Pasco County, FLFL674,516622+35%

205Hamilton County, TNTN390,833621+9%

206Washington County, MNMN286,895619+18%

207Richmond County, GAGA206,5596180%

208Rockwall County, TXTX140,738616+82%

209Lorain County, OHOH323,219614+6%

210Chatham County, GAGA311,855613+14%

211Kenosha County, WIWI168,448612+11%

212Loudoun County, VAVA449,749606+84%

213Onondaga County, NYNY466,584600+2%

214Campbell County, KYKY95,441597+2%

215Jefferson County, ALAL665,742592−1%

216Santa Cruz County, CACA258,852589+3%

217Racine County, WIWI198,919587+3%

218St. Joseph County, ININ272,861583+1%

219Albany County, NYNY321,225582+3%

220Mahoning County, OHOH224,706580−7%

221Gaston County, NCNC246,558579+8%

222Winnebago County, ILIL283,674576+6%

223Greenville County, SCSC583,125574+19%

224Bernalillo County, NMNM667,601571+19%

225Burlington County, NJNJ481,439561+6%

226Harford County, MDMD266,446560+12%

227Clay County, MOMO265,032558+21%

228Lancaster County, PAPA563,159550+10%

229Fayette County, GAGA125,156548+17%

230Barnstable County, MAMA233,539548−3%

231Allen County, ININ402,329541+7%

232Brevard County, FLFL663,982535+14%

233Warren County, OHOH257,181530+34%

234Norton, VAVA3,477529+1%

235Worcester County, MAMA888,502529+6%

236McHenry County, ILIL317,751512+19%

237Dauphin County, PAPA293,351511+6%

238Cherokee County, GAGA299,273509+51%

239Richland County, SCSC434,956508+20%

240Ingham County, MIMI289,709505+1%

241Pulaski County, ARAR404,611505+6%

242Solano County, CACA455,376503+5%

243Floyd County, ININ82,153502+5%

244Sedgwick County, KSKS538,433500+10%

245Atlantic County, NJNJ278,657494+9%

246Hidalgo County, TXTX921,549493+36%

247Cabarrus County, NCNC249,725493+36%

248San Joaquin County, CACA823,815492+22%

249Cumberland County, NCNC338,473489+5%

250Washtenaw County, MIMI370,214488+7%

251St. Lucie County, FLFL402,449486+44%

252Marin County, CACA253,694485+2%

253Boone County, KYKY145,316482+38%

254York County, PAPA473,197481+14%

255Berks County, PAPA440,072480+10%

256Stafford County, VAVA170,803479+39%

257Pierce County, WAWA946,288477+13%

258Cleveland County, OKOK303,973475+23%

259James City County, VAVA83,326471+39%

260Ottawa County, MIMI308,459468+11%

261Brown County, WIWI275,803468+9%

262Lackawanna County, PAPA216,502467+1%

263Orange County, NYNY417,669459+9%

264Hall County, GAGA226,568458+29%

265Hillsborough County, NHNH433,415457+5%

266Paulding County, GAGA190,996456+74%

267Cameron County, TXTX433,946456+21%

268Escambia County, FLFL333,834453+1%

269Volusia County, FLFL606,573449+12%

270Ventura County, CACA830,851447+9%

271Kalamazoo County, MIMI263,795445+5%

272Gregg County, TXTX126,095445+9%

273Montgomery County, TXTX781,194437+55%

274Clermont County, OHOH216,977436+11%

275Johnson County, ININ174,262436+21%

276Manatee County, FLFL468,200435+22%

277Putnam County, NYNY99,028433+4%

278Cumberland County, PAPA277,270432+10%

279Barrow County, GAGA99,773431+50%

280Columbia County, GAGA169,189427+39%

281Elkhart County, ININ208,774427+8%

282Rockingham County, NHNH324,077425+6%

283Rutherford County, TNTN386,352424+44%

284Ohio County, WVWV40,496420−6%

285Madison County, ALAL433,516418+21%

286Calvert County, MDMD94,484416+19%

287Maricopa County, AZAZ4,689,558415+24%

288Niagara County, NYNY208,912414−2%

289Leon County, FLFL299,048412+15%

290St. Clair County, ILIL250,708411+5%

291Medina County, OHOH185,025409+14%

292Dane County, WIWI590,375408+14%

293Greene County, MOMO309,286407+14%

294Boulder County, COCO328,560406+1%

295Nueces County, TXTX352,992405+8%

296Catoosa County, GAGA69,628394+20%

297Delaware County, OHOH242,032393+58%

298Porter County, ININ176,049393+12%

299Beaver County, PAPA166,032392−6%

300Greene County, OHOH174,322391+9%

301Hamblen County, TNTN68,843388+8%

302Cape May County, NJNJ93,390387−5%

303Washington County, RIRI129,795386+3%

304Catawba County, NCNC170,172385+9%

305Winnebago County, WIWI174,218384+7%

306Carson City, NVNV58,571382+5%

307Charleston County, SCSC436,200381+13%

308Sullivan County, TNTN163,759379+2%

309Williamson County, TXTX752,827379+69%

310Adams County, COCO554,668378+21%

311Weber County, UTUT278,174378+18%

312Washington County, TNTN141,199377+15%

313Island County, WAWA85,657377+10%

314Madison County, ILIL263,110376+4%

315Lexington County, SCSC317,588375+21%

316Dutchess County, NYNY300,708374+6%

317Carroll County, MDMD176,677373+11%

318Ada County, IDID546,141373+30%

319Houston County, GAGA178,214372+26%

320Hancock County, WVWV27,729371−6%

321Ozaukee County, WIWI94,346371+5%

322Ascension Parish, LALA135,105370+40%

323Lebanon County, PAPA146,380369+11%

324Roanoke County, VAVA97,150369+8%

325Hernando County, FLFL221,701365+32%

326Newton County, GAGA125,583365+61%

327Scott County, MNMN159,017365+45%

328Buncombe County, NCNC277,417363+16%

329Scott County, IAIA175,259361+4%

330Luzerne County, PAPA332,126361+1%

331Kendall County, ILIL145,470358+110%

332Hendricks County, ININ193,510357+40%

333Alamance County, NCNC186,177357+16%

334Westmoreland County, PAPA349,324355−1%

335Frederick County, MDMD302,883353+20%

336Whitfield County, GAGA106,212353+23%

337Spartanburg County, SCSC380,857352+12%

338Erie County, PAPA265,8323510%

339Monroe County, ININ143,345350+14%

340Clark County, OHOH135,340349−4%

341Thurston County, WAWA304,261349+22%

342Tippecanoe County, ININ190,456346+16%

343Rock Island County, ILIL141,869345−1%

344Stanislaus County, CACA557,719344+15%

345Cabell County, WVWV91,1833430%

346Snohomish County, WAWA870,656342+18%

347Muskegon County, MIMI177,901342+1%

348Lancaster County, NENE334,049341+14%

349Trumbull County, OHOH198,972341−7%

350Douglas County, COCO399,396339+62%

351DeSoto County, MSMS197,918339+50%

352Cumberland County, MEME317,222337+6%

353Orange County, NCNC152,498337+13%

354Mobile County, ALAL411,658336+3%

355Strafford County, NHNH135,043335+10%

356Polk County, FLFL874,790335+24%

357Jefferson County, MOMO233,132333+10%

358Brazos County, TXTX249,088332+28%

359York County, SCSC306,887332+37%

360Portage County, OHOH163,404331+6%

361Shawnee County, KSKS178,607327+5%

362Spalding County, GAGA70,775327+10%

363Harrison County, MSMS217,136326−1%

364Cumberland County, NJNJ157,148325+7%

365Berkeley County, WVWV139,522324+37%

366Washington County, MDMD157,731322+12%

367Oldham County, KYKY70,986322+31%

368Canyon County, IDID275,123322+44%

369Livingston County, MIMI197,315320+15%

370Charles County, MDMD176,593320+22%

371Montgomery County, TNTN249,935320+28%

372Union County, NCNC267,674318+63%

373St. Johns County, FLFL346,328316+54%

374Clay County, FLFL239,593316+36%

375Williamson County, TNTN272,061314+45%

376Lake County, FLFL456,068312+41%

377Lubbock County, TXTX328,906311+15%

378Boyd County, KYKY47,7513100%

379Sonoma County, CACA486,444307+6%

380Erie County, OHOH73,296307−3%

381Washington County, WIWI139,238306+12%

382Warren County, NJNJ112,953305+6%

383Spotsylvania County, VAVA155,388304+35%

384Riverside County, CACA2,544,916304+42%

385Sumner County, TNTN215,538303+23%

386Peoria County, ILIL178,553301+2%

387Bradley County, TNTN115,465301+13%

388Delaware County, ININ113,106300−1%

389Hunterdon County, NJNJ131,781300+5%

390Hampshire County, MAMA164,065300+4%

391Clark County, ININ130,451296+14%

392Linn County, IAIA232,028295+10%

393Davidson County, NCNC180,182294+11%

394Bell County, TXTX402,248294+30%

395St. Mary's County, MDMD116,692293+22%

396El Paso County, COCO757,040293+20%

397Montgomery County, ALAL225,891292+3%

398Cecil County, MDMD107,131292+18%

399Chittenden County, VTVT169,115292+7%

400Madison County, ININ135,088291−1%

401Caddo Parish, LALA224,226290+1%

402Fairfield County, OHOH169,752290+19%

403Coweta County, GAGA160,240289+43%

404Sussex County, NJNJ148,063288+4%

405Dougherty County, GAGA82,616288−2%

406Jefferson County, TXTX254,3212880%

407Henderson County, NCNC122,375286+20%

408Broome County, NYNY195,7362840%

409Alachua County, FLFL290,028282+13%

410Howard County, ININ83,904282−3%

411Jessamine County, KYKY57,147282+24%

412Hinds County, MSMS211,888282−2%

413Beaufort County, SCSC204,433282+34%

414Monroe County, PAPA167,179279+22%

415Iredell County, NCNC211,798278+30%

416Outagamie County, WIWI195,894277+10%

417Kent County, DEDE194,786277+28%

418Monroe County, MIMI156,004277+4%

419St. Tammany Parish, LALA279,108277+22%

420Berrien County, MIMI152,444276−3%

421Indian River County, FLFL172,799275+22%

422Saratoga County, NYNY241,343271+9%

423Rowan County, NCNC155,096271+6%

424Brooke County, WVWV21,142270−5%

425Martin County, FLFL166,272269+15%

426Vigo County, ININ106,512267+2%

427Monongalia County, WVWV107,991267+17%

428Spokane County, WAWA558,344267+13%

429Marion County, OROR355,777267+11%

430Lincoln County, NCNC98,654265+23%

431Allen County, OHOH100,881264−2%

432Wicomico County, MDMD106,899264+17%

433McCracken County, KYKY67,5532640%

434Anderson County, SCSC219,930262+13%

435Benton County, ARAR332,554261+44%

436Pitt County, NCNC182,936258+26%

437Utah County, UTUT759,859258+40%

438Carver County, MNMN114,379257+30%

439Walton County, GAGA112,696256+38%

440Jefferson County, WVWV63,102256+27%

441Lawrence County, PAPA83,911255−4%

442La Crosse County, WIWI121,339254+7%

443Miami County, OHOH112,634252+4%

444Ouachita Parish, LALA158,542252+4%

445Richland County, OHOH124,893251−3%

446Bullitt County, KYKY86,454250+21%

447Saginaw County, MIMI187,688250−5%

448Shelby County, ALAL238,552248+36%

449Placer County, CACA442,081248+40%

450Clark County, NVNV2,407,226247+42%

451Orange County, TXTX86,266245−4%

452Rensselaer County, NYNY160,510244+5%

453Montgomery County, VAVA98,434244+13%

454Licking County, OHOH185,564244+14%

455Bay County, MIMI102,123244−2%

456Douglas County, KSKS120,920243+11%

457Citrus County, FLFL171,666243+20%

458Washington County, PAPA210,802242+2%

459Blair County, PAPA119,541242−2%

460Dorchester County, SCSC178,397240+42%

461Pickens County, SCSC139,198240+8%

462Horry County, SCSC427,551238+37%

463Wood County, WVWV82,385237−1%

464Boone County, MOMO191,746237+20%

465Franklin County, KYKY52,649237+3%

466Sebastian County, ARAR130,641237+9%

467Charlotte County, FLFL217,212235+13%

468Onslow County, NCNC217,175233+18%

469Geauga County, OHOH95,676233+3%

470Butler County, PAPA200,169233+6%

471Hays County, TXTX304,390232+61%

472Black Hawk County, IAIA131,532232+2%

473Lee County, ALAL189,881231+22%

474Androscoggin County, MEME116,487230+4%

475Brazoria County, TXTX419,080230+30%

476Hancock County, ININ90,969229+26%

477Jackson County, MIMI159,552228+1%

478Smith County, TXTX252,549228+20%

479Sangamon County, ILIL194,170227+5%

480Lee County, NCNC70,258227+18%

481McLennan County, TXTX272,020227+10%

482St. Clair County, MIMI160,486226−1%

483Sheboygan County, WIWI118,047226+3%

484Rock County, WIWI166,472223+5%

485Anderson County, TNTN82,066223+5%

486Bay County, FLFL204,479223+14%

487Carroll County, GAGA131,036221+27%

488Wayne County, NCNC122,278221+8%

489Wilson County, NCNC81,150221+10%

490Olmsted County, MNMN166,731221+16%

491Nantucket County, MAMA14,758220+7%

492Blount County, TNTN143,820220+16%

493Lowndes County, GAGA122,867220+19%

494Buchanan County, MOMO83,540218+4%

495Bartow County, GAGA120,800218+32%

496Chemung County, NYNY80,415218−2%

497Washington County, ARAR271,213216+29%

498St. John the Baptist Parish, LALA39,875214+7%

499Kanawha County, WVWV172,381214−4%

500Tompkins County, NYNY104,047214+5%

SHOWING 1–500 OF 3,131

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Download CSV (full list, 3,131 rows)

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

Frequently asked

Which county has the highest population density?

New York County, New York ranks #1 with 69,992 (2010 Decennial Census).

What are the top 5 counties by population density?

New York County, New York, Kings County, New York, Bronx County, New York, Queens County, New York, San Francisco County, California.

How many counties are in this ranking?

3,131 counties qualify after filtering for population minimums and data availability. The ranking covers 2010 Decennial Census data.

How is population density measured?

Residents per square mile of land area. Source: US Census Bureau, 2010 Decennial Census.