- Los Angeles County, CACounty9,808,667
- Cook County, ILCounty5,182,090
- Harris County, TXCounty4,838,303
- Maricopa County, AZCounty4,559,748
- San Diego County, CACounty3,288,774
- Orange County, CACounty3,165,820
- Miami-Dade County, FLCounty2,738,356
- Kings County, NYCounty2,631,580
- Dallas County, TXCounty2,621,179
- Riverside County, CACounty2,478,600
- Clark County, NVCounty2,329,548
- Queens County, NYCounty2,323,052
- King County, WACounty2,287,171
- San Bernardino County, CACounty2,197,104
- Tarrant County, TXCounty2,167,390
- Bexar County, TXCounty2,067,341
- Broward County, FLCounty1,977,129
- Santa Clara County, CACounty1,902,047
- Wayne County, MICounty1,772,259
- Alameda County, CACounty1,649,473
- Middlesex County, MACounty1,638,365
- New York County, NYCounty1,629,477
- Sacramento County, CACounty1,594,006
- Philadelphia County, PACounty1,579,706
- Palm Beach County, FLCounty1,533,806
- Suffolk County, NYCounty1,530,146
- Orange County, FLCounty1,471,937
- Bronx County, NYCounty1,404,779
- Nassau County, NYCounty1,389,591
- Franklin County, OHCounty1,333,048
- Travis County, TXCounty1,330,015
- Oakland County, MICounty1,279,825
- Hennepin County, MNCounty1,269,496
- Cuyahoga County, OHCounty1,245,873
- Allegheny County, PACounty1,238,177
- Salt Lake County, UTCounty1,196,523
- Wake County, NCCounty1,178,653
- Contra Costa County, CACounty1,165,012
- Collin County, TXCounty1,163,337
- Mecklenburg County, NCCounty1,154,681
- Fairfax County, VACounty1,147,837
- Fulton County, GACounty1,076,561
- Montgomery County, MDCounty1,065,949
- Pima County, AZCounty1,060,490
- Duval County, FLCounty1,023,153
- Fresno County, CACounty1,016,725
- Honolulu County, HICounty1,001,146
- Westchester County, NYCounty999,677
- St. Louis County, MOCounty995,569
- Gwinnett County, GACounty979,864
- Denton County, TXCounty979,561
- Capitol County, CTCounty977,290
- Marion County, INCounty975,809
- Pinellas County, FLCounty963,481
- Bergen County, NJCounty962,316
- Prince George's County, MDCounty959,754
- Erie County, NYCounty950,622
- Pierce County, WACounty930,319
- DuPage County, ILCounty930,024
- Milwaukee County, WICounty926,331
- Shelby County, TNCounty919,173
- Kern County, CACounty915,075
- Fort Bend County, TXCounty893,767
- Hidalgo County, TXCounty891,977
- Macomb County, MICounty879,853
- Middlesex County, NJCounty871,290
- El Paso County, TXCounty870,779
- Worcester County, MACounty867,788
- Montgomery County, PACounty867,573
- Essex County, NJCounty863,002
- Baltimore County, MDCounty850,796
- Snohomish County, WACounty844,430
- Ventura County, CACounty837,469
- Hamilton County, OHCounty830,774
- San Francisco County, CACounty830,235
- Lee County, FLCounty817,666
- Essex County, MACounty813,054
- Oklahoma County, OKCounty806,199
- Multnomah County, ORCounty801,477
- San Joaquin County, CACounty797,334
- Polk County, FLCounty790,694
- Suffolk County, MACounty785,121
- Jefferson County, KYCounty783,022
- Cobb County, GACounty775,208
- DeKalb County, GACounty765,351
- Monroe County, NYCounty753,753
- El Paso County, COCounty742,999
- San Mateo County, CACounty742,340
- Norfolk County, MACounty730,082
- Jackson County, MOCounty719,976
- Denver County, COCounty718,877
- Hudson County, NJCounty718,323
- Davidson County, TNCounty715,388
- Lake County, ILCounty714,223
- Utah County, UTCounty705,400
- Will County, ILCounty701,462
- Montgomery County, TXCounty684,432
- District of Columbia, DCCounty681,294
- Tulsa County, OKCounty680,794
- Bernalillo County, NMCounty673,930
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