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100 Most Populous U.S. County Governments
  National Association of Counties (NACO)  
Alameda to El Paso  Erie to Macomb Maricopa to Prince George's Queens to Worcester
  1. Alameda (CA)
  2. Allegheny (PA)
  3. Baltimore (MD)
  4. Bergen (NJ)
  5. Bernalillo (NM)
  6. Bexar (TX)
  7. Bristol (MA)
  8. Bronx (NY)
  9. Broward (FL)
  10. Bucks (PA)
  11. Camden (NJ)
  12. Clark (NV)
  13. Cobb (GA)
  14. Contra Costa (CA)
  15. Cook (IL)
  16. Cuyahoga (OH)
  17. Dade (FL)
  18. Dallas (TX)
  19. Davidson (TN)
  20. DeKalb (GA)
  21. Delaware (PA)
  22. Denver (CO)
  23. DuPage (IL)
  24. Duval (FL)
  25. El Paso (TX)
  1. Erie (NY)
  2. Essex (MA)
  3. Essex (NJ)
  4. Fairfax (VA)
  5. Franklin (OH)
  6. Fresno (CA)
  7. Fulton (GA)
  8. Gwinnett (GA)
  9. Hamilton (OH)
  10. Harris (TX)
  11. Hennepin (MN)
  12. Hidalgo (TX)
  13. Hillsborough (FL)
  14. Honolulu (HI)
  15. Hudson (NJ)
  16. Jackson (MO)
  17. Jefferson (AL)
  18. Jefferson (KY)
  19. Kent (MI)
  20. Kern (CA)
  21. King (WA)
  22. Kings (NY)
  23. Lake (IL)
  24. Los Angeles (CA)
  25. Macomb (MI)
  1. Maricopa (AZ)
  2. Marion (IN)
  3. Mecklenburg (NC)
  4. Middlesex (MA)
  5. Middlesex (NJ)
  6. Milwaukee (WI)
  7. Monmouth (NJ)
  8. Monroe (NY)
  9. Montgomery (MD)
  10. Montgomery (OH)
  11. Montgomery (PA)
  12. Multnomah (OR)
  13. Nassau (NY)
  14. New York (NY)

  15. Norfolk (MA)
  16. Oakland (MI)
  17. Oklahoma (OK)
  18. Orange (CA)
  19. Orange (FL)
  20. Palm Beach (FL)
  21. Philadelphia (PA)
  22. Pierce (WA)
  23. Pima (AZ)
  24. Pinellas (FL)
  25. Prince George's (MD)
  1. Queens (NY)
  2. Riverside (CA)
  3. Sacramento (CA)
  4. Salt Lake (UT)
  5. San Bernardino (CA)
  6. San Diego (CA)
  7. San Francisco (CA)
  8. San Joaquin (CA)
  9. San Mateo (CA)
  10. Santa Clara (CA)
  11. Shelby (TN)
  12. Snohomish (WA)
  13. St. Louis (MO)
  14. Suffolk (MA)
  15. Suffolk (NY)
  16. Summit (OH)
  17. Tarrant (TX)
  18. Travis (TX)
  19. Tulsa (OK)
  20. Union (NJ)
  21. Ventura (CA)
  22. Wake (NC)
  23. Wayne (MI)
  24. Westchester (NY)
  25. Worcester (MA)
  • Note #1:     Connecticut and Rhode Island do not have county governments, although together they have four counties that would be among the 100 most populous counties in the United States.  Therefore, above are listed the 104 most populous U.S. counties not including three Connecticut counties (Fairfield, Hartford and New Haven) and one Rhode Island county (Providence).
  • Note #2:     County governments with either unknown or no official websites are those counties in regular black font.
  • Note #3:    Due to the fact that Boston/Suffolk County, Denver/Denver County, Indianapolis/Marion County, Jacksonville/Duval County and Philadelphia/Philadelphia County have joint city/county governments, official site of those cities were used.
Comments/Suggestions? Page last updated May 31, 2001