| Code | Name | Region |
|---|---|---|
| USFSG | Flushing/queens/new York | NY |
| USFOG | Fogelsville | PA |
| USUJD | Folcroft | PA |
| USNHX | Foley | AL |
| USFLS | Foley | FL |
| USFY2 | Foley | MN |
| USFON | Folkston | GA |
| USFOO | Follansbee | WV |
| USF2L | Follett | TX |
| USFYB | Folly Beach | SC |
| USFOU | Folsom | CA |
| USFKY | Florence | KY |
| USFLM | Florence | MA |
| USOEZ | Florence | MO |
| USFRC | Florence | MS |
| USFR7 | Florence | MT |
| USFLR | Florence | NJ |
| USFQE | Florence | OR |
| USFLO | Florence | SC |
| USFLX | Florence | TX |
| USOEE | Florence | VT |
| USFCE | Florence | WI |
| USMSL | Florence-muscle Shoals Apt | AL |
| USFL6 | Floresville | TX |
| USFP2 | Florham Park | NJ |
| USFL4 | Florida | MA |
| USFOA | Florida | NY |
| USYFA | Florida City | FL |
| USFMD | Florien | LA |
| USFOT | Florissant | MO |
| USFSX | Flossmoor | IL |
| USFZN | Flinton | PA |
| USZDB | Flintstone | GA |
| US5FS | Flintstone | MD |
| USFPP | Flippin | AR |
| USFMM | Flomaton | AL |
| USFW2 | Floodwood | MN |
| USFFW | Floodwood | NY |
| USAEA | Flora | IL |
| USFOI | Flora | IN |
| USFOM | Flora | MS |
| USF22 | Floral City | FL |
| USFLP | Floral Park | NY |
| USFL7 | Florala | AL |
| USFPU | Floreffe | PA |
| USFNE | Florence | AL |
| USZZO | Florence | AZ |
| USFCL | Florence | CA |
| USFLZ | Florence | CO |
| USF77 | Florence | IN |