| Code Value |
Definition |
| AB | Alberta, Canada |
| AG | Aguascalientes, Mexico |
| AK | Alaska, USA |
| AL | Alabama, USA |
| AR | Arkansas, USA |
| AS | American Samoa, US Territorial Possession |
| AZ | Arizona, USA |
| BA | Baja California, Mexico |
| BC | British Columbia, Canada |
| BJ | Baja California Sur, Mexico |
| CA | California, USA |
| CE | Campeche, Mexico |
| CH | Chihuahua, Mexico |
| CI | Chiapas, Mexico |
| CL | Colima, Mexico |
| CO | Colorado, USA |
| CT | Connecticut, USA |
| CU | Coahuila de Zaragoza, Mexico |
| DC | District of Columbia, USA |
| DE | Delaware, USA |
| DF | Distrito Federal Mexico |
| DO | Durango, Mexico |
| DS | U.S. Department of State |
| DT | U.S. Department of Transportation |
| EM | (Estados) Mexico |
| FH | Federal Motor Carrier Safety Administration (FMCSA used to be the OMC in the FHWA) |
| FL | Florida, USA |
| FM | Federal States of Micronesia, US Territorial Possession |
| GA | Georgia, USA |
| GM | Guam, US Territorial Possession |
| GR | Guerrero, Mexico |
| GS | General Services Administration (GSA) |
| GU | Guanajuato, Mexico |
| HI | Hawaii, USA |
| HL | Hidalgo, Mexico |
| IA | Iowa, USA |
| ID | Idaho, USA |
| IL | Illinois, USA |
| IN | Indiana, USA |
| IR | Internal Revenue Service (IRS) |
| JL | Jalisco, Mexico |
| KS | Kansas, USA |
| KY | Kentucky, USA |
| LA | Louisiana, USA |
| MA | Massachusetts, USA |
| MB | Manitoba, Canada |
| MC | Michoacan de Ocampo, Mexico |
| MD | Maryland, USA |
| ME | Maine, USA |
| MH | Marshal Islands, US Territorial Possession |
| MI | Michigan, USA |
| MN | Minnesota, USA |
| MO | Missouri, USA |
| MP | Northern Mariana Islands, US Territorial Possession |
| MR | Morelos, Mexico |
| MS | Mississippi, USA |
| MT | Montana, USA |
| MX | Mexico (United Mexican States) |
| NA | Nayarit, Mexico |
| NB | New Brunswick, Canada |
| NC | North Carolina, USA |
| ND | North Dakota, USA |
| NE | Nebraska, USA |
| NF | Newfoundland and Labrador, Canada |
| NH | New Hampshire, USA |
| NJ | New Jersey, USA |
| NL | Nuevo Leon, Mexico |
| NM | New Mexico, USA |
| NS | Nova Scotia, Canada |
| NT | Northwest Territory, Canada |
| NU | Nunavut, Canada |
| NV | Nevada, USA |
| NY | New York, USA |
| OA | Oaxaca, Mexico |
| OH | Ohio, USA |
| OK | Oklahoma, USA |
| ON | Ontario, Canada |
| OR | Oregon, USA |
| PA | Pennsylvania, USA |
| PB | Puebla, Mexico |
| PE | Prince Edward Island, Canada |
| PR | Puerto Rico, US Territorial Possession |
| PW | Palau (till 1994), US Territorial Possession |
| PZ | Panamanian Canal Zone till December 2000, US Territorial Possession |
| QC | Quebec, Canada |
| QR | Quintana Roo, Mexico |
| QU | Queretaro de Arteaga, Mexico |
| RI | Rhode Island, USA |
| SC | South Carolina, USA |
| SD | South Dakota, USA |
| SI | Sinaloa, Mexico |
| SK | Saskatchewan, Canada |
| SL | San Luis Potosi, Mexico |
| SO | Sonora, Mexico |
| TA | Tamaulipas, Mexico |
| TB | Tabasco, Mexico |
| TL | Tlaxcala, Mexico |
| TN | Tennessee, USA |
| TS | Transportation Security Administration (TSA) |
| TX | Texas, USA |
| UT | Utah, USA |
| VA | Virginia, USA |
| VC | Veracruz-Llave, Mexico |
| VI | Virgin Islands, US Territorial Possession |
| VT | Vermont, USA |
| WA | Washington, USA |
| WI | Wisconsin, USA |
| WK | Wake Island, US Territorial Possession |
| WV | West Virginia, USA |
| WY | Wyoming, USA |
| YT | Yukon Territory, Canada |
| YU | Yucatan, Mexico |
| ZA | Zacatecas, Mexico |