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 301–400

Vintage 2025 population estimates · 2026 Gazetteer land area · 3,222 county equivalents · page 4 of 33

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What this part of the ranking shows

This page runs from Arlington County, Virginia at 243,931 residents to Porter County, Indiana at 176,049 residents. The 100 entries represent 39 state-level jurisdictions. Ohio has the most entries on this page (7, tied for the lead).

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 301 through 400. Population is the July 1, 2025 estimate; density is per square mile of land.
RankCounty / equivalentStatePopulationPer mi²Land mi²
301Arlington CountyVirginia243,9319,38326
302Delaware CountyOhio242,032546443.1
303Tuscaloosa CountyAlabama241,3681831,320.9
304Saratoga CountyNew York241,343298810
305Ellis CountyTexas240,867257935.8
306Clay CountyFlorida239,593396604.6
307Shelby CountyAlabama238,552304785.5
308Richmond cityVirginia237,2573,95959.9
309Whatcom CountyWashington236,3921122,107.9
310Barnstable CountyMassachusetts233,539592394.2
311Jefferson CountyMissouri233,132355656
312Lake CountyOhio232,2171,012229.4
313Linn CountyIowa232,028324717
314Norfolk cityVirginia231,0134,33653.3
315Doña Ana CountyNew Mexico229,091603,808.2
316Mohave CountyArizona228,1021713,332.1
317Hall CountyGeorgia226,568577392.5
318Oneida CountyNew York226,3921871,212.4
319Montgomery CountyAlabama225,891288785.4
320Mahoning CountyOhio224,706546411.5
321Yuma CountyArizona224,449415,513.8
322Yolo CountyCalifornia224,4102221,013
323Caddo ParishLouisiana224,226255879.5
324York CountyMaine222,434224991.2
325Okaloosa CountyFlorida221,810239929.8
326Jackson CountyOregon221,795802,783.3
327Benton CountyWashington221,7221301,700.1
328Hernando CountyFlorida221,701469473
329Anderson CountySouth Carolina219,930308713.9
330Johnson CountyTexas218,048301725.1
331Charlotte CountyFlorida217,212319681.2
332Onslow CountyNorth Carolina217,175285762.1
333Harrison CountyMississippi217,136378573.7
334Clermont CountyOhio216,977479452.6
335Lackawanna CountyPennsylvania216,502472458.8
336Sumner CountyTennessee215,538407529.5
337Washington CountyUtah213,670882,427.6
338Deschutes CountyOregon213,072713,017.6
339Minnehaha CountySouth Dakota212,691264806.9
340Hinds CountyMississippi211,888244869.8
341Iredell CountyNorth Carolina211,798369574.5
342Santa Rosa CountyFlorida211,1152091,012.4
343Washington CountyPennsylvania210,802246857
344Hawaii CountyHawaii210,043524,028.4
345Champaign CountyIllinois209,972211996.1
346Kaufman CountyTexas209,235268780.7
347Butte CountyCalifornia209,2111281,636.5
348Comal CountyTexas209,166374559.5
349Niagara CountyNew York208,912400522.3
350Elkhart CountyIndiana208,774451463.2
351Calcasieu ParishLouisiana208,4661961,064.2
352Sarpy CountyNebraska208,303875238
353Richmond CountyGeorgia206,559637324.4
354Bay CountyFlorida204,479270758.6
355Beaufort CountySouth Carolina204,433355576
356Muscogee CountyGeorgia202,171934216.5
357Cass CountyNorth Dakota201,7941141,764.9
358Guadalupe CountyTexas201,111283711.2
359St. Louis CountyMinnesota200,518326,248.1
360Butler CountyPennsylvania200,169254789.5
361Trumbull CountyOhio198,972322617.6
362Racine CountyWisconsin198,919598332.6
363DeSoto CountyMississippi197,918415476.4
364Livingston CountyMichigan197,315349565.3
365Outagamie CountyWisconsin195,894307637.6
366Broome CountyNew York195,736277705.7
367Kent CountyDelaware194,786332586.1
368Sangamon CountyIllinois194,170224868.2
369Hendricks CountyIndiana193,510476406.9
370El Dorado CountyCalifornia192,3231131,707.8
371Kootenai CountyIdaho191,8641551,237.8
372Boone CountyMissouri191,746280685.6
373Paulding CountyGeorgia190,996611312.4
374Tippecanoe CountyIndiana190,456382498.9
375Lee CountyAlabama189,881313607.6
376Midland CountyTexas187,855209900.4
377Saginaw CountyMichigan187,688234800.8
378Canadian CountyOklahoma187,189209896.6
379Alamance CountyNorth Carolina186,177440423.5
380Licking CountyOhio185,564272682.4
381Medina CountyOhio185,025439421.5
382Parker CountyTexas184,767204903.7
383Ulster CountyNew York183,3301631,124.2
384Newport News cityVirginia183,2302,65669
385Pitt CountyNorth Carolina182,936280652.4
386Vanderburgh CountyIndiana181,995780233.4
387Shasta CountyCalifornia181,648483,775.6
388Aiken CountySouth Carolina181,5151701,070.7
389Imperial CountyCalifornia181,411434,175.5
390Bayamón MunicipioPuerto Rico180,5624,06444.4
391Davidson CountyNorth Carolina180,182326553
392Shawnee CountyKansas178,607328544
393Peoria CountyIllinois178,553289618.7
394Dorchester CountySouth Carolina178,397314568.4
395Houston CountyGeorgia178,214474376.2
396Muskegon CountyMichigan177,901353503.9
397Lower Connecticut River Valley Planning RegionConnecticut177,311418424.1
398Carroll CountyMaryland176,677395447.6
399Charles CountyMaryland176,593386457.8
400Porter CountyIndiana176,049421418.1

Read the differences behind ranks 301–400

The median population among these 100 entries is 208,620. The first and last entries span 67,882 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

  • Ohio7 entries · 7% of this page
  • Texas7 entries · 7% of this page
  • Florida6 entries · 6% of this page
  • California5 entries · 5% of this page
  • Georgia5 entries · 5% of this page
  • Indiana5 entries · 5% of this page

The remaining 33 jurisdictions contribute 65 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.