US County Area home

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 501–600

Vintage 2025 population estimates · 2026 Gazetteer land area · 3,222 county equivalents · page 6 of 33

Download the full dataset

What this part of the ranking shows

This page runs from Outagamie County, Wisconsin at 307 people per mi² to Clackamas County, Oregon at 228 people per mi². The 100 entries represent 32 state-level jurisdictions. Texas 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 501 through 600. Population is the July 1, 2025 estimate; density is per square mile of land.
RankCounty / equivalentStatePopulationPer mi²Land mi²
501Outagamie CountyWisconsin195,894307637.6
502Wilson CountyTennessee175,033306571.1
503Martin CountyFlorida166,272306543.9
504Clark CountyNevada2,407,2263057,891.7
505Shelby CountyAlabama238,552304785.5
506Rowan CountyNorth Carolina155,096303511.6
507Jefferson CountyWest Virginia63,102302209.3
508Marion CountyOregon355,7773011,180.8
509Johnson CountyTexas218,048301725.1
510Monongalia CountyWest Virginia107,991300360.1
511Madison CountyIndiana135,088299451.9
512Boyd CountyKentucky47,751299159.9
513Saratoga CountyNew York241,343298810
514Hancock CountyIndiana90,969297306
515Sussex CountyDelaware277,140296936.2
516Citrus CountyFlorida171,666295582
517Jackson CountyGeorgia99,265292339.7
518Erie CountyOhio73,296292251.3
519Bullitt CountyKentucky86,454291297.1
520Jefferson CountyTexas254,321290876.7
521Flagler CountyFlorida140,360289486.2
522Peoria CountyIllinois178,553289618.7
523Delaware CountyIndiana113,106288392.1
524Washington CountyArkansas271,213288941.5
525Montgomery CountyAlabama225,891288785.4
526Howard CountyIndiana83,904286293.1
527Sussex CountyNew Jersey148,063286518.5
528Wicomico CountyMaryland106,899286374.4
529Onslow CountyNorth Carolina217,175285762.1
530Monroe CountyMichigan156,004284549.4
531Sumter CountyFlorida157,772283557.1
532Guadalupe CountyTexas201,111283711.2
533Pitt CountyNorth Carolina182,936280652.4
534Pickens CountySouth Carolina139,198280497
535Boone CountyMissouri191,746280685.6
536Marion CountyFlorida442,6602791,588.4
537Loudon CountyTennessee63,764278229.3
538Broome CountyNew York195,736277705.7
539Miami CountyOhio112,634277406.6
540Warren CountyKentucky149,375276541.7
541Lee CountyNorth Carolina70,258275255.1
542Monroe CountyPennsylvania167,179275608.4
543Smith CountyTexas252,549274921.5
544Platte CountyMissouri114,400272419.8
545Licking CountyOhio185,564272682.4
546McCracken CountyKentucky67,553272248.8
547Adjuntas MunicipioPuerto Rico17,99427066.6
548Bay CountyFlorida204,479270758.6
549La Crosse CountyWisconsin121,339269451.8
550Berrien CountyMichigan152,444268567.8
551Kaufman CountyTexas209,235268780.7
552Douglas CountyKansas120,920265455.8
553Vigo CountyIndiana106,512264403.6
554Minnehaha CountySouth Dakota212,691264806.9
555Bartow CountyGeorgia120,800263458.9
556Carroll CountyGeorgia131,036263499.1
557McLennan CountyTexas272,0202621,036.7
558Suffolk cityVirginia104,699262399.2
559Johnson CountyIowa160,044261613
560Ouachita ParishLouisiana158,542260610.1
561Orange CountyTexas86,266258333.8
562Ellis CountyTexas240,867257935.8
563Blount CountyTennessee143,820257558.8
564Olmsted CountyMinnesota166,731255653.5
565Caddo ParishLouisiana224,226255879.5
566Montgomery CountyVirginia98,434254386.8
567Butler CountyPennsylvania200,169254789.5
568Franklin CountyKentucky52,649253207.9
569Harnett CountyNorth Carolina150,137252595.1
570Richland CountyOhio124,893252495.2
571Dougherty CountyGeorgia82,616251328.6
572Allen CountyOhio100,881251402.5
573Ciales MunicipioPuerto Rico16,65225066.6
574Hanover CountyVirginia116,423249467.6
575Androscoggin CountyMaine116,487249468
576Berkeley CountySouth Carolina274,6662491,103.6
577Lowndes CountyGeorgia122,867247497.3
578Rensselaer CountyNew York160,510246652.5
579Washington CountyPennsylvania210,802246857
580Sebastian CountyArkansas130,641246531.2
581Hinds CountyMississippi211,888244869.8
582Oconee CountyGeorgia44,893244184.4
583Anderson CountyTennessee82,066243337.2
584Frederick CountyVirginia99,955242413.1
585Sherburne CountyMinnesota104,194241432.9
586Livingston ParishLouisiana155,036239648.1
587Geauga CountyOhio95,676239400.4
588Okaloosa CountyFlorida221,810239929.8
589Wright CountyMinnesota157,559238661.2
590Brooke CountyWest Virginia21,14223789
591Utuado MunicipioPuerto Rico26,894237113.6
592Lawrence CountyPennsylvania83,911235357.4
593Saginaw CountyMichigan187,688234800.8
594Black Hawk CountyIowa131,532232565.8
595Madison CountyKentucky101,696232437.9
596Rock CountyWisconsin166,472232718.2
597Bay CountyMichigan102,123231442.4
598Sheboygan CountyWisconsin118,047231511.5
599Daviess CountyKentucky104,898229458.4
600Clackamas CountyOregon426,2802281,870.7

Read the differences behind ranks 501–600

The median density among these 100 entries is 268 people per mi². The first and last entries span 79 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

  • Texas8 entries · 8% of this page
  • Florida7 entries · 7% of this page
  • Kentucky7 entries · 7% of this page
  • Georgia6 entries · 6% of this page
  • Ohio6 entries · 6% of this page
  • Indiana5 entries · 5% of this page

The remaining 26 jurisdictions contribute 61 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.

Find a county

Browse by state for a complete state ranking.

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.