Les abréviations des comtés Américain
| Etats | Code international ISO |
| Alabama | AL |
| Alaska | AK |
| Arizona | AZ |
| Arkansas | AR |
| Californie | CA |
| Caroline du Nord | NC |
| Caroline du Sud | SC |
| Colorado | CO |
| Connecticut | CT |
| Dakota du Nord | ND |
| Dakota du Sud | SD |
| Delaware | DE |
| District de Columbia | DC |
| Floride | FL |
| Géorgie | GA |
| Hawaï | HI |
| Idaho | ID |
| Illinois | IL |
| Indiana | IN |
| Iowa | IA |
| Kansas | KS |
| Kentucky | KY |
| Louisiane | LA |
| Maine | ME |
| Maryland | MD |
| Massachusetts | MA |
| Michigan | MI |
| Minnesota | MN |
| Mississippi | MS |
| Missouri | MO |
| Montana | MT |
| Nebraska | NE |
| Nevada | NV |
| New Hampshire | NH |
| New Jersey | NJ |
| New York | NY |
| Nouveau‑Mexique | NM |
| Ohio | OH |
| Oklahoma | OK |
| Oregon | OV |
| Pennsylvanie | PA |
| Rhode Island | RI |
| Tennessee | TN |
| Texas | TX |
| Utah | UT |
| Vermont | VT |
| Virginie | VA |
| Virginie‑Occidentale | WV |
| Washington | WA |
| Wisconsin | WI |
| Wyoming | WY |
Musée de la radio & des communications 