County ranking

Most populous counties in the US

The 100 largest counties by Vintage 2024 population.

Short answer

Los Angeles County, CA ranks first with 9,757,179 residents, followed by Cook County, IL (5,182,617) and Harris County, TX (5,009,302). The list ranks all 3,144 county-equivalents and shows the top 100.
#1 Los Angeles County, CA
9,757,179
  1. 01Los Angeles County, CA9,757,179
  2. 02Cook County, IL5,182,617
  3. 03Harris County, TX5,009,302
  4. 04Maricopa County, AZ4,673,096
  5. 05San Diego County, CA3,298,799
  6. 06Orange County, CA3,170,435
  7. 07Miami-Dade County, FL2,838,461
  8. 08Dallas County, TX2,656,028
  9. 09Kings County, NY2,617,631
  10. 10Riverside County, CA2,529,933
  11. 11Clark County, NV2,398,871
  12. 12King County, WA2,340,211
  13. 13Queens County, NY2,316,841
  14. 14Tarrant County, TX2,230,708
  15. 15San Bernardino County, CA2,214,281
  16. 16Bexar County, TX2,127,737
  17. 17Broward County, FL2,037,472
  18. 18Santa Clara County, CA1,926,325
  19. 19Wayne County, MI1,771,063
  20. 20Middlesex County, MA1,668,956
  21. 21New York County, NY1,660,664
  22. 22Alameda County, CA1,649,060
  23. 23Sacramento County, CA1,611,231
  24. 24Palm Beach County, FL1,582,055
  25. 25Hillsborough County, FL1,581,426
  26. 26Philadelphia County, PA1,573,916
  27. 27Suffolk County, NY1,535,909
  28. 28Orange County, FL1,533,646
  29. 29Nassau County, NY1,392,438
  30. 30Bronx County, NY1,384,724
  31. 31Travis County, TX1,363,767
  32. 32Franklin County, OH1,356,303
  33. 33Oakland County, MI1,296,888
  34. 34Hennepin County, MN1,273,334
  35. 35Collin County, TX1,254,658
  36. 36Cuyahoga County, OH1,240,594
  37. 37Wake County, NC1,232,444
  38. 38Allegheny County, PA1,231,814
  39. 39Salt Lake County, UT1,216,274
  40. 40Mecklenburg County, NC1,206,285
  41. 41Contra Costa County, CA1,172,607
  42. 42Fairfax County, VA1,160,925
  43. 43Fulton County, GA1,090,354
  44. 44Montgomery County, MD1,082,273
  45. 45Pima County, AZ1,080,149
  46. 46Duval County, FL1,055,159
  47. 47Denton County, TX1,045,120
  48. 48Fresno County, CA1,024,125
  49. 49Westchester County, NY1,006,447
  50. 50Gwinnett County, GA1,003,869
  51. 51Honolulu County, HI998,747
  52. 52St. Louis County, MO992,929
  53. 53Capitol Planning Region, CT991,508
  54. 54Marion County, IN981,628
  55. 55Bergen County, NJ978,641
  56. 56Prince George's County, MD966,629
  57. 57Pinellas County, FL965,870
  58. 58Fort Bend County, TX958,434
  59. 59Erie County, NY950,602
  60. 60Pierce County, WA941,170
  61. 61DuPage County, IL937,142
  62. 62Milwaukee County, WI924,740
  63. 63Kern County, CA922,529
  64. 64Hidalgo County, TX914,820
  65. 65Shelby County, TN910,530
  66. 66Middlesex County, NJ890,119
  67. 67Macomb County, MI886,175
  68. 68Essex County, NJ881,527
  69. 69Worcester County, MA881,248
  70. 70Montgomery County, PA879,190
  71. 71El Paso County, TX875,784
  72. 72Snohomish County, WA864,113
  73. 73Lee County, FL860,959
  74. 74Polk County, FL852,878
  75. 75Baltimore County, MD852,425
  76. 76Hamilton County, OH837,359
  77. 77Ventura County, CA835,427
  78. 78San Francisco County, CA827,526
  79. 79Essex County, MA823,938
  80. 80Oklahoma County, OK816,490
  81. 81San Joaquin County, CA816,108
  82. 82Multnomah County, OR795,897
  83. 83Jefferson County, KY793,881
  84. 84Suffolk County, MA793,144
  85. 85Cobb County, GA787,538
  86. 86DeKalb County, GA770,307
  87. 87El Paso County, CO752,772
  88. 88Monroe County, NY752,202
  89. 89Montgomery County, TX749,613
  90. 90Utah County, UT747,234
  91. 91San Mateo County, CA742,893
  92. 92Norfolk County, MA740,754
  93. 93Hudson County, NJ736,185
  94. 94Davidson County, TN729,505
  95. 95Denver County, CO729,019
  96. 96Williamson County, TX727,480
  97. 97Jackson County, MO727,362
  98. 98Lake County, IL718,604
  99. 99Will County, IL708,583
  100. 100District of Columbia, DC702,250
Population 2024. Rank 1 at the top.
GeorgiaIndianaMaineMinnesotaNorth DakotaColoradoAlaskaArkansasIllinoisIowaMississippiNew YorkTennesseeTexasVirginiaKansasAlabamaNorth CarolinaMichiganMissouriNebraskaOhioSouth CarolinaVermontWisconsinCaliforniaKentuckySouth DakotaNevadaFloridaMarylandPennsylvaniaArizonaRhode IslandIdahoOregonMontanaWashingtonWest VirginiaNew MexicoNew HampshireOklahomaUtahWyomingHawaiiLouisianaMassachusettsConnecticutNew JerseyDelawareDistrict of Columbia

Dots mark the location of each of the 100 rows listed.

How much of the country lives in the top counties

The 10 most populous counties hold 12.3% of US residents, the top 50 hold 29.9%, and the top 100 hold 42.3%. The median county has 26,122 people, so Los Angeles County, CA is about 374 times the typical county.

County population versus city population

A county total includes every city and unincorporated area inside it. Los Angeles County, CA includes the city of Los Angeles and every other place inside its boundary, so its total is larger than any single city in it. Each county page lists its towns with their own 2024 estimates.

How this ranking is built

Every county-equivalent in the 50 states and DC is sorted by its Census Vintage 2024 population estimate. Ties are broken by FIPS code. Each row links to the county page with its full profile and state rank.

Questions people ask

Which county ranks first?

Los Angeles County, CA, with 9,757,179 residents.

Which data does this use?

Census Vintage 2024 population estimates and 2024 Gazetteer land area.

Are parishes and independent cities included?

Yes. All county-equivalents are ranked, including Louisiana parishes, Alaska boroughs and census areas, independent cities, Connecticut planning regions, and DC.

Suggested citation

Online Map Tools. "Most populous counties in the US." Published 2026-09-30. https://onlinemaptools.com/rankings/most-populous-counties. Data: Census Vintage 2024 county population estimates; Census 2024 Gazetteer, counties.

Journalists, students and researchers may quote these figures and reuse the table. Please credit Online Map Tools and link to this page. The underlying government data is in the public domain.

Download the data (CSV)

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties

How every number is computed: methodology. Spotted a wrong figure? Report an error.

Browse every state on the states page.