| 1. | Los Angeles County, CA (Los Angeles, East San Gabriel Valley, Long Beach) (pop. 9,519,338) | 3,542,994 |
| 2. | Cook County, IL (Chicago, Cicero, Arlington Heights) (pop. 5,376,741) | 1,947,223 |
| 3. | Suffolk County, NY (Brentwood, West Babylon, Commack) (pop. 1,419,369) | 879,457 |
| 4. | San Diego County, CA (San Diego, Chula Vista, Oceanside) (pop. 2,813,833) | 801,850 |
| 5. | Orange County, CA (North Coast, Santa Ana, Anaheim) (pop. 2,846,289) | 797,473 |
| 6. | Harris County, TX (Houston, Northwest Harris, Pasadena) (pop. 3,400,578) | 741,896 |
| 7. | Middlesex County, MA (Lowell, Cambridge, Newton) (pop. 1,465,396) | 718,209 |
| 8. | Queens County, NY (Queens) (pop. 2,229,379) | 677,520 |
| 9. | Nassau County, NY (North Hempstead, Hempstead, Levittown) (pop. 1,334,544) | 677,149 |
| 10. | Kings County, NY (Brooklyn) (pop. 2,465,326) | 623,796 |
| 11. | Riverside County, CA (Riverside, Perris Valley, Moreno Valley) (pop. 1,545,387) | 602,765 |
| 12. | Miami-Dade County, FL (Miami, Kendale Lakes-Lindgren Acres, Hialeah) (pop. 2,253,362) | 544,449 |
| 13. | Bexar County, TX (San Antonio, West Bexar, Southeast Bexar) (pop. 1,392,931) | 528,827 |
| 14. | Maricopa County, AZ (Phoenix, Mesa, Glendale) (pop. 3,072,149) | 520,651 |
| 15. | Allegheny County, PA (Pittsburgh, Penn Hills, Bethel Park) (pop. 1,281,666) | 460,672 |
| 16. | Santa Clara County, CA (San Jose, Sunnyvale, Santa Clara) (pop. 1,682,585) | 447,369 |
| 17. | Dallas County, TX (Dallas, Garland, Irving) (pop. 2,218,899) | 446,996 |
| 18. | San Bernardino County, CA (San Bernardino, Ontario, Fontana) (pop. 1,709,434) | 445,334 |
| 19. | Westchester County, NY (Yonkers, Greenburgh, New Rochelle) (pop. 923,459) | 435,590 |
| 20. | Bergen County, NJ (Hackensack, Teaneck, Fort Lee) (pop. 884,118) | 430,007 |
| 21. | Fairfield County, CT (Bridgeport, Stamford, Norwalk) (pop. 882,567) | 404,341 |
| 22. | Philadelphia County, PA (Philadelphia) (pop. 1,517,550) | 378,561 |
| 23. | DuPage County, IL (Naperville, Wheaton, Downers Grove) (pop. 904,161) | 373,823 |
| 24. | Cuyahoga County, OH (Cleveland, Parma, Lakewood) (pop. 1,393,978) | 366,464 |
| 25. | Norfolk County, MA (Quincy, Brookline, Weymouth) (pop. 650,308) | 355,321 |
| 26. | Clark County, NV (Las Vegas, Paradise, Henderson) (pop. 1,375,765) | 354,110 |
| 27. | Bronx County, NY (Bronx) (pop. 1,332,650) | 353,098 |
| 28. | Erie County, NY (Buffalo, Amherst, Cheektowaga) (pop. 950,265) | 352,894 |
| 29. | El Paso County, TX (El Paso, Socorro, San Elizario) (pop. 679,622) | 345,950 |
| 30. | Essex County, MA (Lynn, Lawrence, Haverhill) (pop. 723,419) | 341,970 |
| 31. | Suffolk County, MA (Boston, Revere, Chelsea) (pop. 689,807) | 332,744 |
| 32. | New York County, NY (New York, Manhattan) (pop. 1,537,195) | 323,325 |
| 33. | Middlesex County, NJ (Edison, New Brunswick, Perth Amboy) (pop. 750,162) | 322,340 |
| 34. | Bucks County, PA (Levittown, Morrisville, Croydon) (pop. 597,635) | 321,963 |
| 35. | Worcester County, MA (Worcester, Leominster, Fitchburg) (pop. 750,963) | 306,925 |
| 36. | New Haven County, CT (New Haven, Waterbury, Meriden) (pop. 824,008) | 304,677 |
| 37. | Montgomery County, PA (Norristown, Pottstown, King of Prussia) (pop. 750,097) | 301,220 |
| 38. | Wayne County, MI (Detroit, Livonia, Dearborn) (pop. 2,061,162) | 297,283 |
| 39. | Oakland County, MI (Farmington Hills, Troy, Southfield) (pop. 1,194,156) | 289,116 |
| 40. | Fresno County, CA (Fresno, Clovis, Reedley) (pop. 799,407) | 288,324 |
| 41. | Bristol County, MA (New Bedford, Fall River, Taunton) (pop. 534,678) | 286,113 |
| 42. | Hudson County, NJ (Jersey City, Union City, Bayonne) (pop. 608,975) | 280,930 |
| 43. | Broward County, FL (Fort Lauderdale, Hollywood, Pembroke Pines) (pop. 1,623,018) | 280,324 |
| 44. | King County, WA (Seattle, East Seattle, Bellevue) (pop. 1,737,034) | 278,340 |
| 45. | Hartford County, CT (Hartford, New Britain, West Hartford) (pop. 857,183) | 278,203 |
| 46. | Providence County, RI (Providence, Cranston, Pawtucket) (pop. 621,602) | 276,011 |
| 47. | Hidalgo County, TX (McAllen, Southeast Hidalgo, Edinburg) (pop. 569,463) | 269,071 |
| 48. | Delaware County, PA (Chester, Radnor Township, Drexel Hill) (pop. 550,864) | 262,506 |
| 49. | Monmouth County, NJ (Long Branch, Asbury Park, Tinton Falls) (pop. 615,301) | 262,031 |
| 50. | Essex County, NJ (Newark, East Orange, Irvington) (pop. 793,633) | 261,966 |
| 51. | Richmond County, NY (Staten Island) (pop. 443,728) | 254,170 |
| 52. | Macomb County, MI (Warren, Sterling Heights, Shelby) (pop. 788,149) | 249,439 |
| 53. | Union County, NJ (Elizabeth, Union, Plainfield) (pop. 522,541) | 247,240 |
| 54. | Kern County, CA (Bakersfield, East Kern, Delano) (pop. 661,645) | 245,836 |
| 55. | San Mateo County, CA (Daly City, San Mateo, Redwood City) (pop. 707,161) | 243,634 |
| 56. | Ventura County, CA (Oxnard, Thousand Oaks, Simi Valley) (pop. 753,197) | 232,571 |
| 57. | Alameda County, CA (Oakland, Fremont, Hayward) (pop. 1,443,741) | 231,500 |
| 58. | St. Louis County, MO (Florissant, Chesterfield, University City) (pop. 1,016,315) | 230,488 |
| 59. | Sacramento County, CA (Sacramento, Mather, Arden-Arcade) (pop. 1,223,499) | 229,725 |
| 60. | Contra Costa County, CA (Central Contra Costa, West Contra Costa, Concord) (pop. 948,816) | 228,400 |
| 61. | Hampden County, MA (Springfield, Chicopee, Westfield) (pop. 456,228) | 223,685 |
| 62. | Hennepin County, MN (Minneapolis, Bloomington, Brooklyn Park) (pop. 1,116,200) | 215,205 |
| 63. | Will County, IL (Joliet, Bolingbrook, Homer Glen) (pop. 502,266) | 212,252 |
| 64. | Chester County, PA (West Chester, Phoenixville, Coatesville) (pop. 433,501) | 212,113 |
| 65. | Lake County, IL (Waukegan, North Chicago, Highland Park) (pop. 644,356) | 211,380 |
| 66. | Palm Beach County, FL (Sunshine Parkway, West Palm Beach, Boca Raton) (pop. 1,131,184) | 210,006 |
| 67. | Morris County, NJ (Morristown, Dover, Madison) (pop. 470,212) | 206,700 |
| 68. | Hamilton County, OH (Cincinnati, Norwood, Forest Park) (pop. 845,303) | 205,094 |
| 69. | Pima County, AZ (Tucson, Casas Adobes, Catalina Foothills) (pop. 843,746) | 203,770 |
| 70. | Tarrant County, TX (Fort Worth, Northeast Tarrant, Arlington) (pop. 1,446,219) | 200,645 |
| 71. | Passaic County, NJ (Paterson, Clifton, Passaic) (pop. 489,049) | 199,315 |
| 72. | Milwaukee County, WI (Milwaukee, West Allis, Wauwatosa) (pop. 940,164) | 199,153 |
| 73. | Monroe County, NY (Rochester, Irondequoit, Perinton) (pop. 735,343) | 191,112 |
| 74. | Fairfax County, VA (Burke, Reston, Annandale) (pop. 969,749) | 184,183 |
| 75. | San Joaquin County, CA (Stockton, Lodi, Tracy) (pop. 563,598) | 183,692 |
| 76. | Camden County, NJ (Camden, Pennsauken, Lindenwold) (pop. 508,932) | 180,343 |
| 77. | Travis County, TX (Austin, Pflugerville, Wells Branch) (pop. 812,280) | 177,192 |
| 78. | Bernalillo County, NM (Albuquerque, Rio Rancho, South Valley) (pop. 556,678) | 175,266 |
| 79. | Honolulu County, HI (Honolulu, Urban Honolulu, Ewa) (pop. 876,156) | 173,716 |
| 80. | Ocean County, NJ (Toms River, Lakewood, Point Pleasant) (pop. 510,916) | 173,318 |
| 81. | Plymouth County, MA (Brockton, Wareham, Middleborough) (pop. 472,822) | 165,985 |
| 82. | Onondaga County, NY (Syracuse, Clay, Salina) (pop. 458,336) | 163,488 |
| 83. | Denver County, CO (Denver, Holly Hills) (pop. 554,636) | 159,489 |
| 84. | Kane County, IL (Aurora, Elgin, Carpentersville) (pop. 404,119) | 155,391 |
| 85. | Franklin County, OH (Columbus, Westerville, Upper Arlington) (pop. 1,068,978) | 153,400 |
| 86. | Baltimore County, MD (Dundalk, Towson, Catonsville) (pop. 754,292) | 153,243 |
| 87. | Monterey County, CA (Salinas, Seaside, Monterey) (pop. 401,762) | 150,050 |
| 88. | Jefferson Parish, LA (Metairie, Kenner, Marrero) (pop. 455,466) | 148,827 |
| 89. | Santa Barbara County, CA (Santa Maria Valley, Santa Barbara, Santa Maria) (pop. 399,347) | 146,940 |
| 90. | Orange County, FL (Orlando, Southwest Orange, Alafaya) (pop. 896,344) | 145,082 |
| 91. | New Castle County, DE (Brandywine, Wilmington, Greater Newark) (pop. 500,265) | 138,172 |
| 92. | Luzerne County, PA (Wilkes-Barre, Back Mountain, Hazleton) (pop. 319,250) | 138,000 |
| 93. | Cameron County, TX (Brownsville, Harlingen, San Benito) (pop. 335,227) | 137,889 |
| 94. | Orange County, NY (Newburgh, Middletown, Blooming Grove) (pop. 341,367) | 131,308 |
| 95. | Hillsborough County, FL (Tampa, Citrus Park-Fern Lake, Brandon) (pop. 998,948) | 130,973 |
| 96. | Webb County, TX (Laredo, Bruni-Mirando, Webb) (pop. 193,117) | 126,750 |
| 97. | Hillsborough County, NH (Manchester, Nashua, Merrimack) (pop. 380,841) | 124,993 |
| 98. | Ramsey County, MN (St. Paul, Maplewood, Roseville) (pop. 511,035) | 124,823 |
| 99. | Douglas County, NE (Omaha, Ralston, Elkhorn) (pop. 463,585) | 123,962 |
| 100. | Montgomery County, MD (Silver Spring, Wheaton-Glenmont, Germantown) (pop. 873,341) | 122,569 |
| 101. | Westmoreland County, PA (Murrysville, Municipality of Murrysville, Greensburg) (pop. 369,993) | 121,691 |