| Code | Name | Region |
|---|---|---|
| USRKP | Rockport | TX |
| USRPR | Rockport | WA |
| USKOB | Rockport | WV |
| USRS6 | Rocksprings | TX |
| USRKT | Rockton | IL |
| USOAL | Rockvale | TN |
| USOCV | Rockville | CT |
| USXXN | Rockville | IN |
| USRKV | Rockville | MD |
| USR79 | Rockville | MN |
| USRK7 | Rockville | RI |
| USR2V | Rockville | VA |
| USQRC | Rockville Centre | NY |
| USR7P | Rockville Township | IL |
| USXLI | Rockwall | TX |
| USZFE | Rockford | AL |
| US7RO | Rockford | IA |
| USRFD | Rockford | IL |
| USRCF | Rockford | MI |
| USKOD | Rockford | MN |
| USRFO | Rockford | OH |
| USROF | Rockford | TN |
| USVKD | Rockford | WA |
| USRGM | Rockingham | NC |
| USKGH | Rockingham | VT |
| USRCA | Rockland | MA |
| USRKD | Rockland | ME |
| USKLA | Rockland | NY |
| USRQD | Rockland | WI |
| USRKE | Rockledge | FL |
| USK8L | Rockledge | GA |
| USRXH | Rockleigh | NJ |
| USRKL | Rocklin | CA |
| USRKA | Rockmart | GA |
| USR63 | Rockport | IL |
| USRHC | Rock Hill | NC |
| USR8L | Rock Hill | NY |
| USRKH | Rock Hill | SC |
| USRKI | Rock Island | IL |
| US4OK | Rock Island | WA |
| USKPR | Rock Port | MO |
| USRZR | Rock Rapids | IA |
| USXRS | Rock Springs | GA |
| USVWS | Rock Springs | WI |
| USRKS | Rock Springs | WY |
| USXRT | Rock Tavern | NY |
| USRCV | Rock Valley | IA |
| USRKJ | Rockaway | NJ |
| USRW8 | Rockaway Beach | NY |
| USRYK | Rockaway Parks | NY |