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 101–200

Vintage 2025 population estimates · 2026 Gazetteer land area · 3,222 county equivalents · page 2 of 33

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What this part of the ranking shows

This page runs from District of Columbia, District of Columbia at 693,645 residents to Rutherford County, Tennessee at 386,352 residents. The 100 entries represent 37 state-level jurisdictions. Florida has the most entries on this page (11).

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 101 through 200. Population is the July 1, 2025 estimate; density is per square mile of land.
RankCounty / equivalentStatePopulationPer mi²Land mi²
101District of ColumbiaDistrict of Columbia693,64511,34861.1
102Providence CountyRhode Island678,1791,656409.5
103Kent CountyMichigan675,232795849.5
104Pasco CountyFlorida674,516903746.7
105Arapahoe CountyColorado673,820845797.9
106Ocean CountyNew Jersey673,7461,072628.3
107Bernalillo CountyNew Mexico667,6015751,161.7
108Jefferson CountyAlabama665,7425991,111.6
109Brevard CountyFlorida663,9826541,015
110Monmouth CountyNew Jersey651,0351,390468.2
111Bucks CountyPennsylvania647,8281,072604.4
112Western Connecticut Planning RegionConnecticut640,4821,204532.1
113Johnson CountyKansas636,9061,345473.6
114Washington CountyOregon611,708845724.3
115Volusia CountyFlorida606,5735511,101.3
116Douglas CountyNebraska606,4601,857326.5
117Anne Arundel CountyMaryland603,3801,455414.8
118Union CountyNew Jersey601,8635,857102.8
119Bristol CountyMassachusetts593,6401,073553.1
120Dane CountyWisconsin590,3754931,196.5
121New Castle CountyDelaware588,0261,379426.3
122Greenville CountySouth Carolina583,125742785.9
123Delaware CountyPennsylvania580,9373,161183.8
124Jefferson CountyColorado580,451759764.4
125South Central Connecticut Planning RegionConnecticut578,7411,576367.3
126Baltimore cityMaryland569,9977,04280.9
127Lancaster CountyPennsylvania563,159597943.9
128Guilford CountyNorth Carolina562,234870646
129Spokane CountyWashington558,3443161,764.2
130Stanislaus CountyCalifornia557,7193731,496.2
131Chester CountyPennsylvania557,116742750.6
132Adams CountyColorado554,6684751,166.8
133Plymouth CountyMassachusetts546,829830658.5
134Ada CountyIdaho546,1415191,052.3
135Ramsey CountyMinnesota541,6233,557152.3
136Montgomery CountyOhio539,5981,170461.4
137Pinal CountyArizona539,3801015,366.7
138Sedgwick CountyKansas538,433540997
139Summit CountyOhio538,3761,305412.7
140Camden CountyNew Jersey535,7992,420221.4
141Clark CountyWashington532,119847628.5
142Passaic CountyNew Jersey531,6242,856186.1
143Kane CountyIllinois525,7571,012519.4
144Morris CountyNew Jersey524,2511,137461
145Polk CountyIowa516,546902572.7
146Knox CountyTennessee511,4531,006508.4
147Washoe CountyNevada509,386816,315.9
148Lake CountyIndiana504,6121,011498.9
149Prince William CountyVirginia502,9661,500335.3
150Richmond CountyNew York501,2908,71557.5
151Seminole CountyFlorida491,8841,590309.4
152Sonoma CountyCalifornia486,4443091,575.3
153Tulare CountyCalifornia485,1461014,823.9
154Osceola CountyFlorida481,7183631,327.3
155Burlington CountyNew Jersey481,439602799.3
156Sarasota CountyFlorida479,958863556.1
157York CountyPennsylvania473,197523904.4
158Manatee CountyFlorida468,200630742.8
159Onondaga CountyNew York466,584599778.4
160Hampden CountyMassachusetts464,338753617
161Naugatuck Valley Planning RegionConnecticut463,3491,122412.8
162Dakota CountyMinnesota457,710814562.6
163East Baton Rouge ParishLouisiana456,1801,002455.5
164Lake CountyFlorida456,068478954
165Solano CountyCalifornia455,376554821.7
166Virginia Beach cityVirginia453,7371,854244.7
167Loudoun CountyVirginia449,749872515.7
168Marion CountyFlorida442,6602791,588.4
169Placer CountyCalifornia442,0813141,407.4
170Santa Barbara CountyCalifornia442,0651622,733.9
171Berks CountyPennsylvania440,072514856.4
172Charleston CountySouth Carolina436,200475918.3
173Richland CountySouth Carolina434,956574757.3
174Cameron CountyTexas433,946487891.7
175Monterey CountyCalifornia433,7291323,281.7
176Madison CountyAlabama433,516541801.7
177Hillsborough CountyNew Hampshire433,415494876.5
178Jefferson ParishLouisiana431,3981,434300.9
179Horry CountySouth Carolina427,5513771,133.1
180St. Charles CountyMissouri426,499761560.3
181Clackamas CountyOregon426,2802281,870.7
182Lucas CountyOhio423,3471,246339.7
183Brazoria CountyTexas419,0803071,363.3
184Orange CountyNew York417,669514812.1
185Waukesha CountyWisconsin417,210759549.7
186Collier CountyFlorida417,1312091,997
187Mobile CountyAlabama411,6583351,229.4
188Pulaski CountyArkansas404,611534758.4
189St. Lucie CountyFlorida402,449704571.9
190Allen CountyIndiana402,329612657.1
191Bell CountyTexas402,2483821,053.8
192Forsyth CountyNorth Carolina401,718984408
193Genesee CountyMichigan401,093630636.9
194Butler CountyOhio400,128858466.5
195Douglas CountyColorado399,396475840.1
196Mercer CountyNew Jersey399,2891,779224.5
197Chesterfield CountyVirginia397,148938423.5
198Hamilton CountyTennessee390,833721542.2
199Hamilton CountyIndiana387,036981394.4
200Rutherford CountyTennessee386,352624619.5

Read the differences behind ranks 101–200

The median population among these 100 entries is 496,587. The first and last entries span 307,293 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

  • Florida11 entries · 11% of this page
  • New Jersey8 entries · 8% of this page
  • California7 entries · 7% of this page
  • Pennsylvania6 entries · 6% of this page
  • Colorado4 entries · 4% of this page
  • Ohio4 entries · 4% of this page

The remaining 31 jurisdictions contribute 60 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.