Ranking of US Counties By Population in 2021
Updated on June 18, 2025.
Based on the US Census Vintage data estimates, in 2021, the Population for the United States was 332.10M. Among all US counties, Los Angeles County had the highest population (9.81M), followed by Cook County (5.19M), and Harris County (4.74M).
On the other hand, Loving County had the lowest population (56) followed by Kalawao County (81), and King County (256).
The chart below shows the top 10 counties with high population, and the table below shows the ranking of the top 200 US counties.
You can see similar ranking information for related topics. You can also see links at the bottom of the page for the ranking of counties for each state.
You may also be interested in:
Related Topics: US Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Ranking of US Counties By Population in 2021
Items per page:
25
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| Rank | County | Population |
|---|---|---|
| 1 | Los Angeles County, CA | 9809239 |
| 2 | Cook County, IL | 5185134 |
| 3 | Harris County, TX | 4736633 |
| 4 | Maricopa County, AZ | 4500147 |
| 5 | San Diego County, CA | 3274244 |
| 6 | Orange County, CA | 3159351 |
| 7 | Miami-Dade County, FL | 2669925 |
| 8 | Kings County, NY | 2634268 |
| 9 | Dallas County, TX | 2589162 |
| 10 | Riverside County, CA | 2455225 |
| 11 | Queens County, NY | 2328286 |
| 12 | Clark County, NV | 2296651 |
| 13 | King County, WA | 2253242 |
| 14 | San Bernardino County, CA | 2190877 |
| 15 | Tarrant County, TX | 2130359 |
| 16 | Bexar County, TX | 2031319 |
| 17 | Broward County, FL | 1935655 |
| 18 | Santa Clara County, CA | 1878320 |
| 19 | Wayne County, MI | 1775196 |
| 20 | Alameda County, CA | 1643856 |
| 21 | Middlesex County, MA | 1620553 |
| 22 | Philadelphia County, PA | 1589918 |
| 23 | Sacramento County, CA | 1588824 |
| 24 | New York County, NY | 1576787 |
| 25 | Suffolk County, NY | 1534053 |
| 26 | Palm Beach County, FL | 1503677 |
| 27 | Hillsborough County, FL | 1484844 |
| 28 | Orange County, FL | 1427909 |
| 29 | Bronx County, NY | 1420392 |
| 30 | Nassau County, NY | 1392058 |
| 31 | Franklin County, OH | 1317840 |
| 32 | Travis County, TX | 1309113 |
| 33 | Oakland County, MI | 1272776 |
| 34 | Hennepin County, MN | 1270232 |
| 35 | Cuyahoga County, OH | 1247735 |
| 36 | Allegheny County, PA | 1245440 |
| 37 | Salt Lake County, UT | 1186513 |
| 38 | Contra Costa County, CA | 1163813 |
| 39 | Wake County, NC | 1152626 |
| 40 | Fairfax County, VA | 1142381 |
| 41 | Mecklenburg County, NC | 1125279 |
| 42 | Collin County, TX | 1114687 |
| 43 | Fulton County, GA | 1062576 |
| 44 | Montgomery County, MD | 1056087 |
| 45 | Pima County, AZ | 1049083 |
| 46 | Fresno County, CA | 1012879 |
| 47 | Honolulu County, HI | 1004349 |
| 48 | Duval County, FL | 1002908 |
| 49 | Westchester County, NY | 1000036 |
| 50 | St. Louis County, MO | 998785 |
| 51 | Capitol Planning Region, CT | 971938 |
| 52 | Marion County, IN | 971682 |
| 53 | Gwinnett County, GA | 965458 |
| 54 | Pinellas County, FL | 959703 |
| 55 | Prince George's County, MD | 956603 |
| 56 | Bergen County, NJ | 955510 |
| 57 | Erie County, NY | 953023 |
| 58 | Denton County, TX | 944086 |
| 59 | Pierce County, WA | 927738 |
| 60 | DuPage County, IL | 927145 |
| 61 | Milwaukee County, WI | 924469 |
| 62 | Shelby County, TN | 923255 |
| 63 | Kern County, CA | 912782 |
| 64 | Hidalgo County, TX | 879929 |
| 65 | Macomb County, MI | 877789 |
| 66 | El Paso County, TX | 867700 |
| 67 | Montgomery County, PA | 864252 |
| 68 | Middlesex County, NJ | 862513 |
| 69 | Worcester County, MA | 862052 |
| 70 | Fort Bend County, TX | 860626 |
| 71 | Essex County, NJ | 854416 |
| 72 | Baltimore County, MD | 850670 |
| 73 | Ventura County, CA | 840009 |
| 74 | Snohomish County, WA | 836235 |
| 75 | Hamilton County, OH | 827564 |
| 76 | San Francisco County, CA | 815498 |
| 77 | Essex County, MA | 807315 |
| 78 | Multnomah County, OR | 804934 |
| 79 | Oklahoma County, OK | 799961 |
| 80 | Lee County, FL | 791013 |
| 81 | San Joaquin County, CA | 788096 |
| 82 | Jefferson County, KY | 777624 |
| 83 | Suffolk County, MA | 776280 |
| 84 | Cobb County, GA | 766747 |
| 85 | DeKalb County, GA | 759333 |
| 86 | Monroe County, NY | 756089 |
| 87 | Polk County, FL | 755712 |
| 88 | San Mateo County, CA | 739330 |
| 89 | El Paso County, CO | 738811 |
| 90 | Norfolk County, MA | 724906 |
| 91 | Jackson County, MO | 717993 |
| 92 | Lake County, IL | 712733 |
| 93 | Denver County, CO | 711530 |
| 94 | Hudson County, NJ | 703545 |
| 95 | Davidson County, TN | 700966 |
| 96 | Will County, IL | 699327 |
| 97 | Utah County, UT | 686038 |
| 98 | Bernalillo County, NM | 675410 |
| 99 | Tulsa County, OK | 674123 |
| 100 | Jefferson County, AL | 669677 |
| 101 | Kent County, MI | 658979 |
| 102 | Providence County, RI | 658887 |
| 103 | Arapahoe County, CO | 656952 |
| 104 | Montgomery County, TX | 650960 |
| 105 | Ocean County, NJ | 649990 |
| 106 | Bucks County, PA | 647489 |
| 107 | Monmouth County, NJ | 646531 |
| 108 | Williamson County, TX | 644740 |
| 109 | Western Connecticut Planning Region, CT | 623927 |
| 110 | Brevard County, FL | 618000 |
| 111 | Johnson County, KS | 614962 |
| 112 | Washington County, OR | 602356 |
| 113 | Anne Arundel County, MD | 596354 |
| 114 | Douglas County, NE | 585534 |
| 115 | Pasco County, FL | 585290 |
| 116 | Jefferson County, CO | 580854 |
| 117 | Bristol County, MA | 579729 |
| 118 | Delaware County, PA | 577126 |
| 119 | Baltimore city, MD | 576575 |
| 120 | Union County, NJ | 572930 |
| 121 | New Castle County, DE | 572116 |
| 122 | South Central Connecticut Planning Region, CT | 568961 |
| 123 | Volusia County, FL | 566481 |
| 124 | Dane County, WI | 561788 |
| 125 | Lancaster County, PA | 556364 |
| 126 | Stanislaus County, CA | 552939 |
| 127 | Spokane County, WA | 545540 |
| 128 | Ramsey County, MN | 544068 |
| 129 | Guilford County, NC | 542050 |
| 130 | Chester County, PA | 541036 |
| 131 | Summit County, OH | 537516 |
| 132 | Montgomery County, OH | 536229 |
| 133 | Greenville County, SC | 534675 |
| 134 | Plymouth County, MA | 532726 |
| 135 | Sedgwick County, KS | 524470 |
| 136 | Camden County, NJ | 524176 |
| 137 | Adams County, CO | 523603 |
| 138 | Passaic County, NJ | 518494 |
| 139 | Kane County, IL | 516564 |
| 140 | Ada County, ID | 513098 |
| 141 | Clark County, WA | 512662 |
| 142 | Morris County, NJ | 510691 |
| 143 | Lake County, IN | 499319 |
| 144 | Polk County, IA | 497903 |
| 145 | Washoe County, NV | 494380 |
| 146 | Richmond County, NY | 494039 |
| 147 | Knox County, TN | 486005 |
| 148 | Prince William County, VA | 485433 |
| 149 | Sonoma County, CA | 484561 |
| 150 | Tulare County, CA | 476939 |
| 151 | Onondaga County, NY | 471959 |
| 152 | Seminole County, FL | 470935 |
| 153 | Burlington County, NJ | 464547 |
| 154 | Hampden County, MA | 462640 |
| 155 | York County, PA | 459264 |
| 156 | Virginia Beach city, VA | 458599 |
| 157 | East Baton Rouge Parish, LA | 453685 |
| 158 | Naugatuck Valley Planning Region, CT | 452095 |
| 159 | Solano County, CA | 450819 |
| 160 | Pinal County, AZ | 449086 |
| 161 | Sarasota County, FL | 448730 |
| 162 | Dakota County, MN | 442784 |
| 163 | Monterey County, CA | 439245 |
| 164 | Santa Barbara County, CA | 437117 |
| 165 | Jefferson Parish, LA | 434206 |
| 166 | Berks County, PA | 429698 |
| 167 | Lucas County, OH | 429535 |
| 168 | Loudoun County, VA | 428827 |
| 169 | Hillsborough County, NH | 424475 |
| 170 | Clackamas County, OR | 423892 |
| 171 | Cameron County, TX | 422805 |
| 172 | Richland County, SC | 417306 |
| 173 | Charleston County, SC | 414605 |
| 174 | Manatee County, FL | 413805 |
| 175 | Mobile County, AL | 413164 |
| 176 | Placer County, CA | 412968 |
| 177 | St. Charles County, MO | 410515 |
| 178 | Waukesha County, WI | 409191 |
| 179 | Orange County, NY | 405214 |
| 180 | Genesee County, MI | 404713 |
| 181 | Osceola County, FL | 404055 |
| 182 | Pulaski County, AR | 398005 |
| 183 | Madison County, AL | 396663 |
| 184 | Lake County, FL | 396414 |
| 185 | Allen County, IN | 389220 |
| 186 | Butler County, OH | 387671 |
| 187 | Collier County, FL | 387316 |
| 188 | Lane County, OR | 386082 |
| 189 | Forsyth County, NC | 385753 |
| 190 | Marion County, FL | 385024 |
| 191 | Mercer County, NJ | 382231 |
| 192 | Bell County, TX | 380611 |
| 193 | Brazoria County, TX | 379174 |
| 194 | Orleans Parish, LA | 377547 |
| 195 | Lehigh County, PA | 375922 |
| 196 | Stark County, OH | 373861 |
| 197 | Chesterfield County, VA | 371022 |
| 198 | Douglas County, CO | 369826 |
| 199 | Hamilton County, TN | 369678 |
| 200 | Anoka County, MN | 367835 |
Ranking of Counties By Population in 2021 for each US State
Use the following links to see the ranking of counties by population for each of the following US states.