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Most densely populated counties

Population per square mile of land, using the latest Census Bureau estimate and Gazetteer land area. Small urban counties and independent cities lead because a large population shares little land.

Ranks 401–500

Vintage 2025 population estimates · 2026 Gazetteer land area · 3,222 county equivalents · page 5 of 33

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What this part of the ranking shows

This page runs from DeSoto County, Mississippi at 415 people per mi² to Brazoria County, Texas at 307 people per mi². The 100 entries represent 39 state-level jurisdictions. Puerto Rico has the most entries on this page (8).

Rank numbers continue across pages and describe the full selected ranking. They are not state ranks. Start at rank 1 for the leading entries, or open a county profile for its state rank and median comparisons.

Most densely populated counties, ranks 401 through 500. Population is the July 1, 2025 estimate; density is per square mile of land.
RankCounty / equivalentStatePopulationPer mi²Land mi²
401DeSoto CountyMississippi197,918415476.4
402Island CountyWashington85,657410208.7
403Sumner CountyTennessee215,538407529.5
404Carson CityNevada58,571405144.5
405Ozaukee CountyWisconsin94,346405233
406Lebanon CountyPennsylvania146,380405361.8
407Winnebago CountyWisconsin174,218401434.7
408Niagara CountyNew York208,912400522.3
409Lancaster CountyNebraska334,049399837.6
410Clay CountyFlorida239,593396604.6
411Sullivan CountyTennessee163,759396413.5
412Carroll CountyMaryland176,677395447.6
413Washington CountyRhode Island129,795394329.3
414Benton CountyArkansas332,554392847.7
415Guayanilla MunicipioPuerto Rico16,48939042.2
416Roanoke CountyVirginia97,150388250.5
417Spotsylvania CountyVirginia155,388387401.9
418Charles CountyMaryland176,593386457.8
419Orange CountyNorth Carolina152,498384397.6
420Scott CountyIowa175,259383458.1
421Beaver CountyPennsylvania166,032382434.7
422Ohio CountyWest Virginia40,496382106
423Tippecanoe CountyIndiana190,456382498.9
424Bell CountyTexas402,2483821,053.8
425St. Clair CountyIllinois250,708381657.7
426Lajas MunicipioPuerto Rico22,78438060
427Cumberland CountyMaine317,222379836.2
428Utah CountyUtah759,8593792,004.5
429Oldham CountyKentucky70,986379187.3
430Harrison CountyMississippi217,136378573.7
431Dutchess CountyNew York300,708378795.6
432Horry CountySouth Carolina427,5513771,133.1
433Comal CountyTexas209,166374559.5
434Luzerne CountyPennsylvania332,126373889.9
435Stanislaus CountyCalifornia557,7193731,496.2
436Cape May CountyNew Jersey93,390371251.5
437Iredell CountyNorth Carolina211,798369574.5
438Madison CountyIllinois263,110368715.5
439Strafford CountyNew Hampshire135,043367367.5
440Lubbock CountyTexas328,906367895.6
441Whitfield CountyGeorgia106,212366290.4
442Ceiba MunicipioPuerto Rico10,55936429
443Coweta CountyGeorgia160,240363441
444Monroe CountyIndiana143,345363394.5
445Osceola CountyFlorida481,7183631,327.3
446Spalding CountyGeorgia70,775361196
447El Paso CountyColorado757,0403562,126.4
448Jefferson CountyMissouri233,132355656
449Beaufort CountySouth Carolina204,433355576
450Muskegon CountyMichigan177,901353503.9
451Riverside CountyCalifornia2,544,9163537,209
452Bradley CountyTennessee115,465351328.8
453Clark CountyIndiana130,451350372.5
454Livingston CountyMichigan197,315349565.3
455Salinas MunicipioPuerto Rico24,21834969.4
456Walton CountyGeorgia112,696345326.8
457Washington CountyMaryland157,731345457.8
458Indian River CountyFlorida172,799344502.6
459Clark CountyOhio135,340342395.9
460Westmoreland CountyPennsylvania349,3243401,027.7
461Fairfield CountyOhio169,752337504.4
462Hancock CountyWest Virginia27,72933682.6
463Orocovis MunicipioPuerto Rico21,32933563.6
464Portage CountyOhio163,404335487.5
465Mobile CountyAlabama411,6583351,229.4
466Lincoln CountyNorth Carolina98,654333295.9
467Erie CountyPennsylvania265,832333799
468Kent CountyDelaware194,786332586.1
469Jessamine CountyKentucky57,147332172.1
470Rock Island CountyIllinois141,869332427.5
471Alachua CountyFlorida290,028331875.7
472St. Tammany ParishLouisiana279,108330845.3
473Shawnee CountyKansas178,607328544
474Henderson CountyNorth Carolina122,375328373
475Davidson CountyNorth Carolina180,182326553
476St. Mary's CountyMaryland116,692325358.6
477Cumberland CountyNew Jersey157,148325483.4
478Cabell CountyWest Virginia91,183324281
479Jayuya MunicipioPuerto Rico14,42332444.5
480Johnston CountyNorth Carolina256,448324792
481Patillas MunicipioPuerto Rico15,07732446.6
482Linn CountyIowa232,028324717
483Washington CountyWisconsin139,238323430.6
484Carver CountyMinnesota114,379323353.9
485Trumbull CountyOhio198,972322617.6
486Nantucket CountyMassachusetts14,75831946.2
487Guánica MunicipioPuerto Rico11,84031937.1
488Charlotte CountyFlorida217,212319681.2
489Warren CountyNew Jersey112,953317356.5
490Spokane CountyWashington558,3443161,764.2
491Chittenden CountyVermont169,115315536.9
492Placer CountyCalifornia442,0813141,407.4
493Dorchester CountySouth Carolina178,397314568.4
494Lee CountyAlabama189,881313607.6
495Hampshire CountyMassachusetts164,065311527.2
496Cecil CountyMaryland107,131309346.3
497Sonoma CountyCalifornia486,4443091,575.3
498Anderson CountySouth Carolina219,930308713.9
499Hunterdon CountyNew Jersey131,781308427.8
500Brazoria CountyTexas419,0803071,363.3

Read the differences behind ranks 401–500

The median density among these 100 entries is 353 people per mi². The first and last entries span 108 people per square mile. This median describes the entries on this page, not the full national dataset. Pagination is a browsing boundary, not a distinct geographic region.

Adjacent ranks can differ by a handful of residents or by many thousands. Open a county profile for its population trend since 2020, land area, and state comparisons.

Where the entries on this page are located

  • Puerto Rico8 entries · 8% of this page
  • North Carolina6 entries · 6% of this page
  • Florida5 entries · 5% of this page
  • Maryland5 entries · 5% of this page
  • Pennsylvania5 entries · 5% of this page
  • California4 entries · 4% of this page

The remaining 33 jurisdictions contribute 67 entries. The list above shows the six most represented, with alphabetical ordering when counts tie.

These counts describe representation in this slice of the ranking. They do not measure a state’s share of national land or population. Compare the first and last county equivalents on this page to inspect land, water, and total area separately.

Read the geographic explanation behind this ranking, or return to the ranking overview for the national distribution and guidance on selecting a measurement.

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Population rankings use Census Bureau Vintage 2025 estimates; density rankings divide them by original ALAND square meters. Land rankings use original ALAND square meters; total-area rankings use ALAND + AWATER. Exact ties use ascending GEOID. Displayed square-mile values are rounded. Read the methodology.