Regulations last checked for updates: May 18, 2024

Title 49 - Transportation last revised: May 14, 2024
Appendix Appendix A - Appendix A to Part 1580—High Threat Urban Areas (HTUAs)
State Urban area Geographic areas
AZPhoenix AreaChandler, Gilbert, Glendale, Mesa, Peoria, Phoenix, Scottsdale, Tempe, and a 10-mile buffer extending from the border of the combined area.
CAAnaheim/Santa Ana AreaAnaheim, Costa Mesa, Garden Grove, Fullerton, Huntington Beach, Irvine, Orange, Santa Ana, and a 10-mile buffer extending from the border of the combined area.
Bay AreaBerkeley, Daly City, Fremont, Hayward, Oakland, Palo Alto, Richmond, San Francisco, San Jose, Santa Clara, Sunnyvale, Vallejo, and a 10-mile buffer extending from the border of the combined area.
Los Angeles/Long Beach AreaBurbank, Glendale, Inglewood, Long Beach, Los Angeles, Pasadena, Santa Monica, Santa Clarita, Torrance, Simi Valley, Thousand Oaks, and a 10-mile buffer extending from the border of the combined area.
Sacramento AreaElk Grove, Sacramento, and a 10-mile buffer extending from the border of the combined area.
San Diego AreaChula Vista, Escondido, and San Diego, and a 10-mile buffer extending from the border of the combined area.
CODenver
Area
Arvada, Aurora, Denver, Lakewood, Westminster, Thornton, and a 10-mile buffer extending from the border of the combined area.
DCNational Capital RegionNational Capital Region and a 10-mile buffer extending from the border of the combined area.
FLFort Lauderdale AreaFort Lauderdale, Hollywood, Miami Gardens, Miramar, Pembroke Pines, and a 10-mile buffer extending from the border of the combined area.
Jacksonville AreaJacksonville and a 10-mile buffer extending from the city border.
Miami AreaHialeah, Miami, and a 10-mile buffer extending from the border of the combined area.
Orlando AreaOrlando and a 10-mile buffer extending from the city border.
Tampa AreaClearwater, St. Petersburg, Tampa, and a 10-mile buffer extending from the border of the combined area.
GAAtlanta AreaAtlanta and a 10-mile buffer extending from the city border.
HIHonolulu AreaHonolulu and a 10-mile buffer extending from the city border.
ILChicago AreaChicago and a 10-mile buffer extending from the city border.
INIndianapolis AreaIndianapolis and a 10-mile buffer extending from the city border.
KYLouisville AreaLouisville and a 10-mile buffer extending from the city border.
LABaton Rouge AreaBaton Rouge and a 10-mile buffer extending from the city border.
New Orleans AreaNew Orleans and a 10-mile buffer extending from the city border.
MABoston AreaBoston, Cambridge, and a 10-mile buffer extending from the border of the combined area.
MDBaltimore AreaBaltimore and a 10-mile buffer extending from the city border.
MIDetroit AreaDetroit, Sterling Heights, Warren, and a 10-mile buffer extending from the border of the combined area.
MNTwin Cities AreaMinneapolis, St. Paul, and a 10-mile buffer extending from the border of the combined entity.
MOKansas City AreaIndependence, Kansas City (MO), Kansas City (KS), Olathe, Overland Park, and a 10-mile buffer extending from the border of the combined area.
St. Louis AreaSt. Louis and a 10-mile buffer extending from the city border.
NCCharlotte AreaCharlotte and a 10-mile buffer extending from the city border.
NEOmaha AreaOmaha and a 10-mile buffer extending from the city border.
NJJersey City/Newark AreaElizabeth, Jersey City, Newark, and a 10-mile buffer extending from the border of the combined area.
NVLas Vegas AreaLas Vegas, North Las Vegas, and a 10-mile buffer extending from the border of the combined entity.
NYBuffalo AreaBuffalo and a 10-mile buffer extending from the city border.
New York City AreaNew York City, Yonkers, and a 10-mile buffer extending from the border of the combined area.
OHCincinnati AreaCincinnati and a 10-mile buffer extending from the city border.
Cleveland AreaCleveland and a 10-mile buffer extending from the city border.
Columbus AreaColumbus and a 10-mile buffer extending from the city border.
Toledo AreaOregon, Toledo, and a 10-mile buffer extending from the border of the combined area.
OKOklahoma City AreaNorman, Oklahoma and a 10-mile buffer extending from the border of the combined area.
ORPortland AreaPortland, Vancouver, and a 10-mile buffer extending from the border of the combined area.
PAPhiladelphia AreaPhiladelphia and a 10-mile buffer extending from the city border.
Pittsburgh AreaPittsburgh and a 10-mile buffer extending from the city border.
TNMemphis AreaMemphis and a 10-mile buffer extending from the city border.
TXDallas/Fort Worth/Arlington AreaArlington, Carrollton, Dallas, Fort Worth, Garland, Grand Prairie, Irving, Mesquite, Plano, and a 10-mile buffer extending from the border of the combined area.
Houston AreaHouston, Pasadena, and a 10-mile buffer extending from the border of the combined entity.
San Antonio AreaSan Antonio and a 10-mile buffer extending from the city border.
WASeattle AreaSeattle, Bellevue, and a 10-mile buffer extending from the border of the combined area.
WIMilwaukee AreaMilwaukee and a 10-mile buffer extending from the city border.
authority: 49 U.S.C. 114; Pub. L. 110-53 (121 Stat. 266, Aug. 3, 2007) secs. 1501 (6 U.S.C. 1151), 1512 (6 U.S.C. 1162) and 1517 (6 U.S.C. 1167)
source: 85 FR 16506, Mar. 23, 2020, unless otherwise noted.