Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024
All TitlesTitle 40Chapter IPart 122Subpart DAppendix Appendix I - Appendix I to Part 122—Counties With Unincorporated Urbanized Areas Greater Than 100,000, But Less Than 250,000 According to the 1990 Decennial Census by the Bureau of the Census
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Appendix Appendix I - Appendix I to Part 122—Counties With Unincorporated Urbanized Areas Greater Than 100,000, But Less Than 250,000 According to the 1990 Decennial Census by the Bureau of the Census
State County Unincorporated urbanized population
AlabamaJefferson78,608
ArizonaPima162,202
CaliforniaAlameda115,082
Contra Costa131,082
Kern128,503
Orange223,081
Riverside166,509
San Bernardino162,202
ColoradoArapahoe103,248
FloridaBroward142,329
Escambia167,463
Hillsborough398,593
Lee102,337
Manatee123,828
Orange378,611
Palm Beach360,553
Pasco148,907
Pinellas255,772
Polk121,528
Sarasota172,600
Seminole127,873
GeorgiaClayton133,237
Cobb322,595
Fulton127,776
Gwinnett237,305
Richmond126,476
KentuckyJefferson239,430
LouisianaEast Baton Rouge102,539
Parish331,307
Jefferson Parish
MarylandHoward157,972
North CarolinaCumberland146,827
NevadaClark327,618
OregonMultnomah 152,923
Washington116,687
South CarolinaGreenville147,464
Richland130,589
VirginiaArlington170,936
Chesterfield174,488
Henrico201,367
Prince William157,131
WashingtonPierce258,530
Snohomish157,218

1 County was previously listed in this appendix; however, population dropped to below 100,000 in the 1990 Census.

[64 FR 68849, Dec. 8, 1999]
authority: The Clean Water Act, 33 U.S.C. 1251
source: 48 FR 14153, Apr. 1, 1983, unless otherwise noted.
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