US County Area home

Most populous counties

County equivalents ranked by the Census Bureau’s latest July 1 population estimate. Land area and density are shown alongside, because a populous county is not necessarily a dense one.

Ranks 501–600

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

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What this part of the ranking shows

This page runs from Skagit County, Washington at 132,975 residents to Grant County, Washington at 105,727 residents. The 100 entries represent 40 state-level jurisdictions. Georgia 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 populous counties, ranks 501 through 600. Population is the July 1, 2025 estimate; density is per square mile of land.
RankCounty / equivalentStatePopulationPer mi²Land mi²
501Skagit CountyWashington132,975771,730.2
502Napa CountyCalifornia132,949177752
503Linn CountyOregon132,843582,289.5
504Bossier ParishLouisiana131,867157839.6
505Hunterdon CountyNew Jersey131,781308427.8
506Humboldt CountyCalifornia131,647373,568
507Black Hawk CountyIowa131,532232565.8
508Carroll CountyGeorgia131,036263499.1
509Sebastian CountyArkansas130,641246531.2
510Clark CountyIndiana130,451350372.5
511Tazewell CountyIllinois130,049201646.5
512Clarke CountyGeorgia129,9211,089119.3
513Washington CountyRhode Island129,795394329.3
514Wichita CountyTexas129,555206627.6
515Kennebec CountyMaine129,067149867.5
516Cambria CountyPennsylvania128,968187688
517Gallatin CountyMontana128,740492,605.4
518Ponce MunicipioPuerto Rico128,3841,117114.9
519Berkshire CountyMassachusetts128,224138926.9
520Jasper CountyMissouri127,428200638.5
521Morgan CountyAlabama126,483218579.7
522Cochise CountyArizona126,332206,209.9
523Gregg CountyTexas126,095461273.4
524Rapides ParishLouisiana125,877951,324.1
525Newton CountyGeorgia125,583459273.8
526Fayette CountyGeorgia125,156643194.7
527Richland CountyOhio124,893252495.2
528Caguas MunicipioPuerto Rico124,1612,11858.6
529Chautauqua CountyNew York124,1261171,060.4
530Missoula CountyMontana123,513482,593
531Hunt CountyTexas123,336147840.4
532Allegan CountyMichigan123,188149825.4
533Fayette CountyPennsylvania123,021156790.8
534Limestone CountyAlabama122,928218563.4
535Lowndes CountyGeorgia122,867247497.3
536Henderson CountyNorth Carolina122,375328373
537Wayne CountyNorth Carolina122,278221553.9
538Comanche CountyOklahoma122,1581141,069.3
539Liberty CountyTexas121,3641051,158.5
540La Crosse CountyWisconsin121,339269451.8
541Douglas CountyKansas120,920265455.8
542Bartow CountyGeorgia120,800263458.9
543Tom Green CountyTexas120,602791,522.3
544San Juan CountyNew Mexico120,340225,517.2
545Robeson CountyNorth Carolina119,941127947.3
546Blair CountyPennsylvania119,541228525.1
547Bastrop CountyTexas118,908134888.2
548Matanuska-Susitna BoroughAlaska118,6664.824,703
549Oswego CountyNew York118,569125951.6
550Dallas CountyIowa118,457201588.2
551Albemarle CountyVirginia118,356164720.5
552Maury CountyTennessee118,131193613.1
553Sheboygan CountyWisconsin118,047231511.5
554Craighead CountyArkansas116,957165707.2
555Pennington CountySouth Dakota116,792422,776.8
556Wayne CountyOhio116,758210555
557St. Mary's CountyMaryland116,692325358.6
558Androscoggin CountyMaine116,487249468
559Hanover CountyVirginia116,423249467.6
560Madison CountyMississippi116,298163714.2
561Cass CountyMissouri115,859166696.6
562Calhoun CountyAlabama115,834191605.9
563Bradley CountyTennessee115,465351328.8
564Flathead CountyMontana115,429235,087.3
565Cowlitz CountyWashington114,8851011,141.2
566Northwest Hills Planning RegionConnecticut114,690146786.6
567Potter CountyTexas114,453126908.4
568Platte CountyMissouri114,400272419.8
569Carver CountyMinnesota114,379323353.9
570Lancaster CountySouth Carolina114,296208549.2
571Hardin CountyKentucky113,482182623.9
572Ontario CountyNew York113,130176644
573Delaware CountyIndiana113,106288392.1
574Warren CountyNew Jersey112,953317356.5
575Walton CountyGeorgia112,696345326.8
576Miami CountyOhio112,634277406.6
577Lycoming CountyPennsylvania112,587921,228.9
578Douglas CountyOregon111,951225,035.8
579Jefferson CountyNew York111,540881,267.9
580LaPorte CountyIndiana111,294186598.3
581Highlands CountyFlorida111,1221091,017.7
582Moore CountyNorth Carolina110,619159697.6
583Houston CountyAlabama110,318190579.8
584Yamhill CountyOregon110,024154715.9
585Navajo CountyArizona109,946119,949.5
586Eaton CountyMichigan109,581191575.2
587Eau Claire CountyWisconsin109,033171637.9
588Franklin CountyMissouri108,090117922.5
589Monongalia CountyWest Virginia107,991300360.1
590Mercer CountyPennsylvania107,860160672.5
591LaSalle CountyIllinois107,773951,135.1
592Adams CountyPennsylvania107,594207518.6
593Cecil CountyMaryland107,131309346.3
594Wicomico CountyMaryland106,899286374.4
595Nassau CountyFlorida106,879165648.7
596Woodbury CountyIowa106,649122872.9
597Vigo CountyIndiana106,512264403.6
598Whitfield CountyGeorgia106,212366290.4
599Walworth CountyWisconsin106,127191555.4
600Grant CountyWashington105,727392,679.6

Read the differences behind ranks 501–600

The median population among these 100 entries is 118,407. The first and last entries span 27,248 residents. 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

  • Georgia8 entries · 8% of this page
  • Texas7 entries · 7% of this page
  • Pennsylvania6 entries · 6% of this page
  • Alabama4 entries · 4% of this page
  • Indiana4 entries · 4% of this page
  • Missouri4 entries · 4% of this page

The remaining 34 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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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.