State | Urban area | Geographic areas |
CA | Anaheim/Los Angeles/Long Beach/Santa Ana Areas | Los Angeles and Orange Counties. |
San Diego Area | San Diego County. | |
San Francisco Bay Area | Alameda, Contra Costa, Marin, San Francisco, and San Mateo Counties. | |
DC (VA, MD, and WV) | National Capital Region | District of Columbia; Counties of Calvert, Charles, Frederick, Montgomery, and Prince George's, MD; Counties of Arlington, Clarke, Fairfax, Fauquier, Loudoun, Prince William, Spotsylvania, Stafford, and Warren County, VA; Cities of Alexandria, Fairfax, Falls Church, Fredericksburg, Manassas, and Manassas Park City, VA; Jefferson County, WV. |
IL/IN | Chicago Area | Counties of Cook, DeKalb, DuPage, Grundy, Kane, Kendall, Lake, McHenry, and Will, IL; Counties of Jasper, Lake, Newton, and Porter, IN; Kenosha County, WI. |
MA | Boston Area | Counties of Essex, Norfolk, Plymouth, Suffolk, Middlesex, MA; Counties of Rockingham and Strafford, NH. |
NY (NJ and PA) | New York City/Jersey City/Newark Area | Counties of Bronx, Kings, Nassau, New York, Putnam, Queens, Richmond, Rockland, Suffolk, and Westchester, NY; Counties of Bergen, Essex, Hudson, Hunterdon, Ocean, Middlesex, Monmouth, Morris, Passaic, Somerset, Sussex, and Union, NJ; Pike County, PA. |
PA (DE and NJ) | Philadelphia Area/Southern New Jersey Area | Counties of Burlington, Camden, and Gloucester, NJ; Counties of Bucks, Chester, Delaware, Montgomery, and Philadelphia, PA; New Castle County, DE; Cecil County, MD; Salem County, NJ. |
TX | Dallas Fort Worth/Arlington Area | Collin, Dallas, Delta, Denton, Ellis, Hunt, Kaufman, Rockwall, Johnson, Parker, Tarrant, and Wise Counties, TX. |
Houston Area | Austin, Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, San Jacinto, and Waller Counties, TX. |
49 C.F.R. §A to Part 1584