Rank of each County within USA by Total population in 2000 1 Los Angeles County, CA 9,519,338 2 Cook County, IL 5,376,741 3 Harris County, TX 3,400,578 4 Maricopa County, AZ 3,072,149 5 Orange County, CA 2,846,289 6 San Diego County, CA 2,813,833 7 Kings County, NY 2,465,326 8 Miami-Dade County, FL 2,253,362 9 Queens County, NY 2,229,379 10 Dallas County, TX 2,218,899 11 Wayne County, MI 2,061,162 12 King County, WA 1,737,034 13 San Bernardino County,Ca 1,709,434 14 Santa Clara County, CA 1,682,585 15 Broward County, FL 1,623,018 16 Riverside County, CA 1,545,387 17 New York County, NY 1,537,195 18 Philadelphia County, PA 1,517,550 19 Middlesex County, MA 1,465,396 20 Tarrant County, TX 1,446,219 21 Alameda County, CA 1,443,741 22 Suffolk County, NY 1,419,369 23 Cuyahoga County, OH 1,393,978 24 Bexar County, TX 1,392,931 25 Clark County, NV 1,375,765 26 Nassau County, NY 1,334,544 27 Bronx County, NY 1,332,650 28 Allegheny County, PA 1,281,666 29 Sacramento County, CA 1,223,499 30 Oakland County, MI 1,194,156 31 Palm Beach County, FL 1,131,184 32 Hennepin County, MN 1,116,200 33 Franklin County, OH 1,068,978 34 St. Louis County, MO 1,016,315 35 Hillsborough County, FL 998,948 36 Fairfax County, VA 969,749 37 Erie County, NY 950,265 38 Contra Costa County, CA 948,816 39 Milwaukee County, WI 940,164 40 Westchester County, NY 923,459 41 Pinellas County, FL 921,482 42 DuPage County, IL 904,161 43 Salt Lake County, UT 898,387 44 Shelby County, TN 897,472 45 Orange County, FL 896,344 46 Bergen County, NJ 884,118 47 Fairfield County, CT 882,567 48 Honolulu County, HI 876,156 49 Montgomery County, MD 873,341 50 Marion County, IN 860,454 51 Hartford County, CT 857,183 52 Hamilton County, OH 845,303 53 Pima County, AZ 843,746 54 New Haven County, CT 824,008 55 Fulton County, GA 816,006 56 Travis County, TX 812,280 57 Prince Georges County, MD 801,515 58 Fresno County, CA 799,407 59 Essex County, NJ 793,633 60 Macomb County, MI 788,149 61 Duval County, FL 778,879 62 San Francisco County, CA 776,733 63 Baltimore County, MD 754,292 64 Ventura County, CA 753,197 65 Worcester County, MA 750,963 66 Middlesex County, NJ 750,162 67 Montgomery County, PA 750,097 68 Monroe County, NY 735,343 69 Essex County, MA 723,419 70 San Mateo County, CA 707,161 71 Pierce County, WA 700,820 72 Mecklenburg County, NC 695,454 73 Jefferson County, KY 693,604 74 Suffolk County, MA 689,807 75 El Paso County, TX 679,622 76 DeKalb County, GA 665,865 77 Jefferson County, AL 662,047 78 Kern County, CA 661,645 79 Multnomah County, OR 660,486 80 Oklahoma County, OK 660,448 81 Jackson County, MO 654,880 82 Baltimore, MD (city) 651,154 83 Norfolk County, MA 650,308 84 Lake County, IL 644,356 85 Wake County, NC 627,846 86 Providence County, RI 621,602 87 Monmouth County, NJ 615,301 88 Hudson County, NJ 608,975 89 Cobb County, GA 607,751 90 Snohomish County, WA 606,024 91 Bucks County, PA 597,635 92 Gwinnett County, GA 588,448 93 Kent County, MI 574,335 94 District of Columbia, DC 572,059 95 Davidson County, TN 569,891 96 Hidalgo County, TX 569,463 97 San Joaquin County, CA 563,598 98 Tulsa County, OK 563,299 99 Montgomery County, OH 559,062 100 Bernalillo County, NM 556,678 101 Denver County, CO 554,636 102 Delaware County, PA 550,864 103 Summit County, OH 542,899 104 Bristol County, MA 534,678 105 Jefferson County, CO 527,056 106 Union County, NJ 522,541 107 El Paso County, CO 516,929 108 Ramsey County, MN 511,035 109 Ocean County, NJ 510,916 110 Camden County, NJ 508,932 111 Will County, IL 502,266 112 New Castle County, DE 500,265 113 Collin County, TX 491,675 114 Anne Arundel County, MD 489,656 115 Passaic County, NJ 489,049 116 Arapahoe County, CO 487,967 117 Orleans Parish, LA 484,674 118 Lake County, IN 484,564 119 Polk County, FL 483,924 120 Brevard County, FL 476,230 121 Plymouth County, MA 472,822 122 Lancaster County, PA 470,658 123 Morris County, NJ 470,212 124 Douglas County, NE 463,585 125 Sonoma County, CA 458,614 126 Onondaga County, NY 458,336 127 Hampden County, MA 456,228 128 Jefferson Parish, LA 455,466 129 Lucas County, OH 455,054 130 Sedgwick County, KS 452,869 131 Johnson County, KS 451,086 132 Stanislaus County, CA 446,997 133 Washington County, OR 445,342 134 Richmond County, NY 443,728 135 Volusia County, FL 443,343 136 Lee County, FL 440,888 137 Genesee County, MI 436,141 138 Chester County, PA 433,501 139 Denton County, TX 432,976 140 Dane County, WI 426,526 141 Virginia Beach, VA (city) 425,257 142 Burlington County, NJ 423,394 143 Guilford County, NC 421,048 144 Spokane County, WA 417,939 145 East Baton Rouge Parish, LA 412,852 146 Kane County, IL 404,119 147 Monterey County, CA 401,762 148 Mobile County, AL 399,843 149 Santa Barbara County, CA 399,347 150 Solano County, CA 394,542 151 Knox County, TN 382,032 152 York County, PA 381,751 153 Hillsborough County, NH 380,841 154 Greenville County, SC 379,616 155 Stark County, OH 378,098 156 Polk County, IA 374,601 157 Berks County, PA 373,638 158 Westmoreland County, PA 369,993 159 Utah County, UT 368,536 160 Tulare County, CA 368,021 161 Seminole County, FL 365,196 162 Adams County, CO 363,857 163 Pulaski County, AR 361,474 164 Waukesha County, WI 360,767 165 Dakota County, MN 355,904 166 Fort Bend County, TX 354,452 167 Mercer County, NJ 350,761 168 St. Louis, MO (city) 348,189 169 Clark County, WA 345,238 170 Pasco County, FL 344,765 171 Orange County, NY 341,367 172 Washoe County, NV 339,486 173 Clackamas County, OR 338,391 174 Cameron County, TX 335,227 175 Butler County, OH 332,807 176 Allen County, IN 331,849 177 Sarasota County, FL 325,957 178 Lane County, OR 322,959 179 Washtenaw County, MI 322,895 180 Richland County, SC 320,677 181 Luzerne County, PA 319,250 182 Nueces County, TX 313,645 183 Lehigh County, PA 312,090 184 Charleston County, SC 309,969 185 Hamilton County, TN 307,896 186 Forsyth County, NC 306,067 187 Cumberland County, NC 302,963 188 Ada County, ID 300,904 189 Anoka County, MN 298,084 190 Somerset County, NJ 297,490 191 Albany County, NY 294,565 192 Escambia County, FL 294,410 193 Montgomery County, TX 293,768 194 Boulder County, CO 291,288 195 Rockland County, NY 286,753 196 Marion County, OR 284,834 197 Lorain County, OH 284,664 198 St. Charles County, MO 283,883 199 Erie County, PA 280,843 200 Prince William County, VA 280,813

Buy an almanac. It will list the first hundred anyway.