Ranking of US Counties By Number of Adults (18-64yrs) in 2021 (ACS-5Yrs)
Updated on July 9, 2024.
Based on the US Census ACS-5Yrs estimates, in 2021, among all US counties, Los Angeles County, CA had the highest number of adults (18-64yrs) (6.48M), followed by Cook County, IL (3.34M), and Harris County, TX (2.94M).
The chart below shows the top 10 counties, and the table below shows the top 200 counties.
You can see similar info for other age cohorts.
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Related Topics: US Census 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of US Counties By Number of Adults (18-64yrs) in 2021
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| Rank | County | Adults (18-64yrs) Pop. |
|---|---|---|
| 1 | Los Angeles County, CA | 6478335 |
| 2 | Cook County, IL | 3339472 |
| 3 | Harris County, TX | 2943798 |
| 4 | Maricopa County, AZ | 2667950 |
| 5 | San Diego County, CA | 2117615 |
| 6 | Orange County, CA | 2010817 |
| 7 | Kings County, NY | 1707584 |
| 8 | Miami-Dade County, FL | 1704001 |
| 9 | Dallas County, TX | 1643121 |
| 10 | Queens County, NY | 1525184 |
| 11 | King County, WA | 1493834 |
| 12 | Riverside County, CA | 1457318 |
| 13 | Clark County, NV | 1384135 |
| 14 | San Bernardino County, CA | 1346180 |
| 15 | Tarrant County, TX | 1304486 |
| 16 | Santa Clara County, CA | 1248070 |
| 17 | Bexar County, TX | 1241988 |
| 18 | Broward County, FL | 1201029 |
| 19 | New York County, NY | 1146850 |
| 20 | Alameda County, CA | 1095049 |
| 21 | Wayne County, MI | 1086997 |
| 22 | Middlesex County, MA | 1054043 |
| 23 | Philadelphia County, PA | 1029132 |
| 24 | Sacramento County, CA | 978120 |
| 25 | Suffolk County, NY | 943079 |
| 26 | Orange County, FL | 928758 |
| 27 | Hillsborough County, FL | 915997 |
| 28 | Bronx County, NY | 911303 |
| 29 | Travis County, TX | 869416 |
| 30 | Franklin County, OH | 847706 |
| 31 | Palm Beach County, FL | 844627 |
| 32 | Nassau County, NY | 842848 |
| 33 | Hennepin County, MN | 810239 |
| 34 | Oakland County, MI | 790687 |
| 35 | Allegheny County, PA | 775224 |
| 36 | Cuyahoga County, OH | 771066 |
| 37 | Salt Lake County, UT | 729411 |
| 38 | Fairfax County, VA | 720678 |
| 39 | Mecklenburg County, NC | 718646 |
| 40 | Wake County, NC | 716650 |
| 41 | Contra Costa County, CA | 714104 |
| 42 | Fulton County, GA | 702232 |
| 43 | Collin County, TX | 657090 |
| 44 | Montgomery County, MD | 645747 |
| 45 | Duval County, FL | 620493 |
| 46 | Honolulu County, HI | 618464 |
| 47 | Pima County, AZ | 614467 |
| 48 | Prince George's County, MD | 614405 |
| 49 | San Francisco County, CA | 609786 |
| 50 | Westchester County, NY | 609588 |
| 51 | Marion County, IN | 607196 |
| 52 | St. Louis County, MO | 598459 |
| 53 | Gwinnett County, GA | 596662 |
| 54 | Fresno County, CA | 594999 |
| 55 | Fairfield County, CT | 590133 |
| 56 | Bergen County, NJ | 586151 |
| 57 | Erie County, NY | 585468 |
| 58 | Milwaukee County, WI | 584724 |
| 59 | Denton County, TX | 576027 |
| 60 | DuPage County, IL | 574507 |
| 61 | Pierce County, WA | 571324 |
| 62 | Shelby County, TN | 568333 |
| 63 | Suffolk County, MA | 565850 |
| 64 | Pinellas County, FL | 565570 |
| 65 | Hartford County, CT | 556123 |
| 66 | Multnomah County, OR | 549833 |
| 67 | Macomb County, MI | 543953 |
| 68 | Kern County, CA | 543636 |
| 69 | Worcester County, MA | 541580 |
| 70 | Middlesex County, NJ | 541267 |
| 71 | New Haven County, CT | 539357 |
| 72 | Essex County, NJ | 532755 |
| 73 | Snohomish County, WA | 523102 |
| 74 | El Paso County, TX | 522516 |
| 75 | Ventura County, CA | 519518 |
| 76 | Baltimore County, MD | 518879 |
| 77 | Montgomery County, PA | 515914 |
| 78 | Hamilton County, OH | 508570 |
| 79 | Essex County, MA | 495751 |
| 80 | Fort Bend County, TX | 493622 |
| 81 | Hidalgo County, TX | 489212 |
| 82 | Cobb County, GA | 488795 |
| 83 | Denver County, CO | 488117 |
| 84 | DeKalb County, GA | 487726 |
| 85 | San Mateo County, CA | 482834 |
| 86 | Hudson County, NJ | 481699 |
| 87 | Jefferson County, KY | 480784 |
| 88 | Oklahoma County, OK | 479688 |
| 89 | Davidson County, TN | 473829 |
| 90 | Monroe County, NY | 467549 |
| 91 | San Joaquin County, CA | 464368 |
| 92 | El Paso County, CO | 456329 |
| 93 | Norfolk County, MA | 449097 |
| 94 | Lake County, IL | 439167 |
| 95 | Jackson County, MO | 437517 |
| 96 | Will County, IL | 432167 |
| 97 | Providence County, RI | 420738 |
| 98 | Bernalillo County, NM | 417797 |
| 99 | Arapahoe County, CO | 412713 |
| 100 | Polk County, FL | 412539 |
| 101 | Jefferson County, AL | 411016 |
| 102 | Kent County, MI | 406883 |
| 103 | Lee County, FL | 405768 |
| 104 | Tulsa County, OK | 399940 |
| 105 | Monmouth County, NJ | 391950 |
| 106 | Bucks County, PA | 391540 |
| 107 | Baltimore city, MD | 387024 |
| 108 | Utah County, UT | 383865 |
| 109 | Washington County, OR | 381230 |
| 110 | Jefferson County, CO | 370560 |
| 111 | Johnson County, KS | 369761 |
| 112 | Williamson County, TX | 369330 |
| 113 | Montgomery County, TX | 367921 |
| 114 | Anne Arundel County, MD | 366579 |
| 115 | Dane County, WI | 365229 |
| 116 | Bristol County, MA | 359258 |
| 117 | New Castle County, DE | 355906 |
| 118 | Union County, NJ | 354801 |
| 119 | Douglas County, NE | 354414 |
| 120 | Delaware County, PA | 352565 |
| 121 | Brevard County, FL | 349218 |
| 122 | Ramsey County, MN | 341016 |
| 123 | Ocean County, NJ | 335790 |
| 124 | Guilford County, NC | 335237 |
| 125 | Summit County, OH | 329516 |
| 126 | Stanislaus County, CA | 329206 |
| 127 | Spokane County, WA | 327777 |
| 128 | Adams County, CO | 325510 |
| 129 | Chester County, PA | 323601 |
| 130 | Montgomery County, OH | 321373 |
| 131 | Lancaster County, PA | 321320 |
| 132 | Camden County, NJ | 320400 |
| 133 | Passaic County, NJ | 320141 |
| 134 | Plymouth County, MA | 318794 |
| 135 | Volusia County, FL | 317584 |
| 136 | Greenville County, SC | 316972 |
| 137 | Pasco County, FL | 316567 |
| 138 | Kane County, IL | 315397 |
| 139 | Morris County, NJ | 314356 |
| 140 | Sedgwick County, KS | 310841 |
| 141 | Richmond County, NY | 304541 |
| 142 | Polk County, IA | 303308 |
| 143 | Clark County, WA | 301363 |
| 144 | Ada County, ID | 300600 |
| 145 | Prince William County, VA | 300314 |
| 146 | Knox County, TN | 299886 |
| 147 | Sonoma County, CA | 297887 |
| 148 | Washoe County, NV | 297296 |
| 149 | Lake County, IN | 297225 |
| 150 | Seminole County, FL | 295887 |
| 151 | Onondaga County, NY | 291747 |
| 152 | Virginia Beach city, VA | 290335 |
| 153 | Hampden County, MA | 287090 |
| 154 | Burlington County, NJ | 285739 |
| 155 | East Baton Rouge Parish, LA | 285675 |
| 156 | Solano County, CA | 279243 |
| 157 | Santa Barbara County, CA | 278922 |
| 158 | York County, PA | 274338 |
| 159 | Tulare County, CA | 272762 |
| 160 | Richland County, SC | 271525 |
| 161 | Hillsborough County, NH | 268316 |
| 162 | Dakota County, MN | 266809 |
| 163 | Jefferson Parish, LA | 265574 |
| 164 | Monterey County, CA | 263580 |
| 165 | Lucas County, OH | 260864 |
| 166 | Loudoun County, VA | 258736 |
| 167 | Charleston County, SC | 258343 |
| 168 | Berks County, PA | 257854 |
| 169 | Clackamas County, OR | 252446 |
| 170 | Washtenaw County, MI | 250186 |
| 171 | Mobile County, AL | 249335 |
| 172 | Orleans Parish, LA | 248886 |
| 173 | St. Charles County, MO | 246909 |
| 174 | Genesee County, MI | 243474 |
| 175 | Mercer County, NJ | 243368 |
| 176 | Pulaski County, AR | 242754 |
| 177 | Waukesha County, WI | 242376 |
| 178 | Madison County, AL | 241198 |
| 179 | Orange County, NY | 240251 |
| 180 | Pinal County, AZ | 239821 |
| 181 | Butler County, OH | 238950 |
| 182 | Osceola County, FL | 237744 |
| 183 | Lane County, OR | 236777 |
| 184 | Cameron County, TX | 236680 |
| 185 | Placer County, CA | 233114 |
| 186 | Forsyth County, NC | 231976 |
| 187 | Larimer County, CO | 229549 |
| 188 | Allen County, IN | 227741 |
| 189 | Brazoria County, TX | 227732 |
| 190 | Lehigh County, PA | 225510 |
| 191 | Hamilton County, TN | 223832 |
| 192 | Bell County, TX | 223509 |
| 193 | Anoka County, MN | 223254 |
| 194 | Stark County, OH | 221015 |
| 195 | Chesterfield County, VA | 219717 |
| 196 | Douglas County, CO | 219552 |
| 197 | Boulder County, CO | 218304 |
| 198 | Rutherford County, TN | 217128 |
| 199 | Nueces County, TX | 215149 |
| 200 | Somerset County, NJ | 214377 |