40 CFR Part 122, Appendix H — Counties With Unincorporated Urbanized Areas With a Population of 250,000 or More According to the 1990 Decennial Census by the Bureau of the Census
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| State | County | Unincorporated urbanized population |
|---|---|---|
| California | Los Angeles | 886,780 |
| Sacramento | 594,889 | |
| San Diego | 250,414 | |
| Delaware | New Castle | 296,996 |
| Florida | Dade | 1,014,504 |
| Georgia | DeKalb | 448,686 |
| Hawaii | Honolulu 1 | 114,506 |
| Maryland | Anne Arundel | 344,654 |
| Baltimore | 627,593 | |
| Montgomery | 599,028 | |
| Prince George's | 494,369 | |
| Texas | Harris | 729,206 |
| Utah | Salt Lake | 270,989 |
| Virginia | Fairfax | 760,730 |
| Washington | King | 520,468 |
1 County was previously listed in this appendix; however, population dropped to below 250,000 in the 1990 Census.
[64 FR 68848, Dec. 8, 1999]