Ranking of US Counties By Population in 2018
Updated on July 26, 2024.
Based on the US Census Vintage data estimates, in 2018, the Population for the United States was 326.84M. Among all US counties, Los Angeles County had the highest population (10.06M), followed by Cook County (5.17M), and Harris County (4.68M).
On the other hand, Kalawao County had the lowest population (87) followed by Loving County (149), and King County (275).
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 2018
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| Rank | County | Population |
|---|---|---|
| 1 | Los Angeles County, CA | 10061533 |
| 2 | Cook County, IL | 5171007 |
| 3 | Harris County, TX | 4676913 |
| 4 | Maricopa County, AZ | 4405306 |
| 5 | San Diego County, CA | 3332483 |
| 6 | Orange County, CA | 3175579 |
| 7 | Miami-Dade County, FL | 2709711 |
| 8 | Dallas County, TX | 2629764 |
| 9 | Kings County, NY | 2580088 |
| 10 | Riverside County, CA | 2443221 |
| 11 | Queens County, NY | 2275286 |
| 12 | Clark County, NV | 2228970 |
| 13 | King County, WA | 2228488 |
| 14 | San Bernardino County, CA | 2165627 |
| 15 | Tarrant County, TX | 2080998 |
| 16 | Bexar County, TX | 1981061 |
| 17 | Broward County, FL | 1948058 |
| 18 | Santa Clara County, CA | 1931985 |
| 19 | Wayne County, MI | 1755868 |
| 20 | Alameda County, CA | 1666596 |
| 21 | New York County, NY | 1632393 |
| 22 | Middlesex County, MA | 1608509 |
| 23 | Philadelphia County, PA | 1586422 |
| 24 | Sacramento County, CA | 1539550 |
| 25 | Palm Beach County, FL | 1482833 |
| 26 | Suffolk County, NY | 1482275 |
| 27 | Hillsborough County, FL | 1455351 |
| 28 | Bronx County, NY | 1432316 |
| 29 | Orange County, FL | 1383657 |
| 30 | Nassau County, NY | 1357423 |
| 31 | Franklin County, OH | 1308599 |
| 32 | Hennepin County, MN | 1258021 |
| 33 | Oakland County, MI | 1257472 |
| 34 | Travis County, TX | 1246693 |
| 35 | Cuyahoga County, OH | 1241788 |
| 36 | Allegheny County, PA | 1217508 |
| 37 | Contra Costa County, CA | 1150840 |
| 38 | Fairfax County, VA | 1149688 |
| 39 | Salt Lake County, UT | 1148949 |
| 40 | Mecklenburg County, NC | 1095911 |
| 41 | Wake County, NC | 1092202 |
| 42 | Fulton County, GA | 1051516 |
| 43 | Montgomery County, MD | 1048794 |
| 44 | Pima County, AZ | 1037746 |
| 45 | Collin County, TX | 1006012 |
| 46 | St. Louis County, MO | 995900 |
| 47 | Fresno County, CA | 991298 |
| 48 | Honolulu County, HI | 981076 |
| 49 | Pinellas County, FL | 973343 |
| 50 | Westchester County, NY | 968928 |
| 51 | Marion County, IN | 959370 |
| 52 | Duval County, FL | 950469 |
| 53 | Milwaukee County, WI | 947908 |
| 54 | Fairfield County, CT | 945511 |
| 55 | Shelby County, TN | 937239 |
| 56 | Bergen County, NJ | 932897 |
| 57 | Gwinnett County, GA | 928072 |
| 58 | DuPage County, IL | 927808 |
| 59 | Erie County, NY | 919941 |
| 60 | Prince George's County, MD | 911372 |
| 61 | Pierce County, WA | 894951 |
| 62 | Kern County, CA | 893618 |
| 63 | Hartford County, CT | 892767 |
| 64 | San Francisco County, CA | 879676 |
| 65 | Macomb County, MI | 872089 |
| 66 | Hidalgo County, TX | 860765 |
| 67 | Denton County, TX | 858148 |
| 68 | New Haven County, CT | 856895 |
| 69 | Ventura County, CA | 847222 |
| 70 | El Paso County, TX | 835590 |
| 71 | Worcester County, MA | 828644 |
| 72 | Baltimore County, MD | 828547 |
| 73 | Montgomery County, PA | 826995 |
| 74 | Middlesex County, NJ | 825677 |
| 75 | Hamilton County, OH | 815853 |
| 76 | Snohomish County, WA | 814107 |
| 77 | Multnomah County, OR | 809448 |
| 78 | Suffolk County, MA | 804023 |
| 79 | Essex County, NJ | 800530 |
| 80 | Oklahoma County, OK | 790926 |
| 81 | Fort Bend County, TX | 789269 |
| 82 | Essex County, MA | 788823 |
| 83 | Jefferson County, KY | 768706 |
| 84 | San Mateo County, CA | 768410 |
| 85 | Cobb County, GA | 757133 |
| 86 | DeKalb County, GA | 755514 |
| 87 | Lee County, FL | 755159 |
| 88 | San Joaquin County, CA | 752590 |
| 89 | Monroe County, NY | 744239 |
| 90 | Denver County, CO | 716340 |
| 91 | El Paso County, CO | 712746 |
| 92 | Polk County, FL | 707095 |
| 93 | Norfolk County, MA | 703628 |
| 94 | Jackson County, MO | 701809 |
| 95 | Lake County, IL | 700455 |
| 96 | Davidson County, TN | 691298 |
| 97 | Will County, IL | 690934 |
| 98 | Bernalillo County, NM | 677929 |
| 99 | Hudson County, NJ | 672390 |
| 100 | Jefferson County, AL | 659672 |
| 101 | Kent County, MI | 653636 |
| 102 | Arapahoe County, CO | 652395 |
| 103 | Tulsa County, OK | 648496 |
| 104 | Providence County, RI | 637298 |
| 105 | Bucks County, PA | 628183 |
| 106 | Utah County, UT | 622076 |
| 107 | Monmouth County, NJ | 620859 |
| 108 | Baltimore city, MD | 603241 |
| 109 | Ocean County, NJ | 601649 |
| 110 | Johnson County, KS | 599045 |
| 111 | Washington County, OR | 597030 |
| 112 | Brevard County, FL | 594978 |
| 113 | Montgomery County, TX | 590127 |
| 114 | Jefferson County, CO | 580027 |
| 115 | Anne Arundel County, MD | 575641 |
| 116 | Williamson County, TX | 567465 |
| 117 | Douglas County, NE | 566523 |
| 118 | Delaware County, PA | 565506 |
| 119 | Bristol County, MA | 564780 |
| 120 | New Castle County, DE | 557983 |
| 121 | Union County, NJ | 556475 |
| 122 | Ramsey County, MN | 548900 |
| 123 | Stanislaus County, CA | 547855 |
| 124 | Volusia County, FL | 547117 |
| 125 | Lancaster County, PA | 543960 |
| 126 | Dane County, WI | 542448 |
| 127 | Summit County, OH | 541451 |
| 128 | Pasco County, FL | 539129 |
| 129 | Guilford County, NC | 533244 |
| 130 | Kane County, IL | 532838 |
| 131 | Montgomery County, OH | 531954 |
| 132 | Chester County, PA | 522256 |
| 133 | Plymouth County, MA | 518888 |
| 134 | Greenville County, SC | 515572 |
| 135 | Sedgwick County, KS | 513877 |
| 136 | Spokane County, WA | 513502 |
| 137 | Adams County, CO | 511485 |
| 138 | Camden County, NJ | 506685 |
| 139 | Passaic County, NJ | 503192 |
| 140 | Sonoma County, CA | 497221 |
| 141 | Morris County, NJ | 493084 |
| 142 | Polk County, IA | 486222 |
| 143 | Lake County, IN | 484918 |
| 144 | Clark County, WA | 482467 |
| 145 | Richmond County, NY | 476531 |
| 146 | Ada County, ID | 469161 |
| 147 | Seminole County, FL | 468195 |
| 148 | Hampden County, MA | 468075 |
| 149 | Knox County, TN | 466787 |
| 150 | Prince William County, VA | 466658 |
| 151 | Washoe County, NV | 464593 |
| 152 | Tulare County, CA | 464279 |
| 153 | Onondaga County, NY | 461890 |
| 154 | Virginia Beach city, VA | 450488 |
| 155 | York County, PA | 448417 |
| 156 | Pinal County, AZ | 446524 |
| 157 | Solano County, CA | 445931 |
| 158 | Burlington County, NJ | 445429 |
| 159 | Santa Barbara County, CA | 445137 |
| 160 | East Baton Rouge Parish, LA | 442720 |
| 161 | Jefferson Parish, LA | 434637 |
| 162 | Monterey County, CA | 433359 |
| 163 | Lucas County, OH | 429990 |
| 164 | Sarasota County, FL | 426890 |
| 165 | Dakota County, MN | 425472 |
| 166 | Cameron County, TX | 421446 |
| 167 | Berks County, PA | 420407 |
| 168 | Clackamas County, OR | 415586 |
| 169 | Richland County, SC | 415159 |
| 170 | Hillsborough County, NH | 414917 |
| 171 | Mobile County, AL | 414275 |
| 172 | Charleston County, SC | 406959 |
| 173 | Genesee County, MI | 406626 |
| 174 | Loudoun County, VA | 405964 |
| 175 | Waukesha County, WI | 402705 |
| 176 | St. Charles County, MO | 398656 |
| 177 | Manatee County, FL | 394043 |
| 178 | Placer County, CA | 392735 |
| 179 | Pulaski County, AR | 392184 |
| 180 | Orleans Parish, LA | 391506 |
| 181 | Orange County, NY | 382411 |
| 182 | Butler County, OH | 382114 |
| 183 | Forsyth County, NC | 379196 |
| 184 | Lane County, OR | 378807 |
| 185 | Collier County, FL | 378657 |
| 186 | Allen County, IN | 375076 |
| 187 | Stark County, OH | 371410 |
| 188 | Washtenaw County, MI | 370548 |
| 189 | Brazoria County, TX | 369470 |
| 190 | Mercer County, NJ | 368720 |
| 191 | Lehigh County, PA | 368452 |
| 192 | Madison County, AL | 367386 |
| 193 | Osceola County, FL | 367359 |
| 194 | Hamilton County, TN | 364626 |
| 195 | Nueces County, TX | 362177 |
| 196 | Marion County, FL | 359630 |
| 197 | Lake County, FL | 357086 |
| 198 | Bell County, TX | 355722 |
| 199 | Anoka County, MN | 354004 |
| 200 | Davis County, UT | 351154 |
Ranking of Counties By Population in 2018 for each US State
Use the following links to see the ranking of counties by population for each of the following US states.