| Count | Prefix |
|---|---|
| 78 | uss- |
| 17 | uss. |
| 2 | uss1 |
| 1 | uss2 |
| 1 | uss3 |
| 1 | uss7 |
| 185 | ussa |
| 57 | ussb |
| 165 | ussc |
| 51 | ussd |
| 199 | usse |
| 45 | ussf |
| 39 | ussg |
| 131 | ussh |
| 100 | ussi |
| 34 | ussj |
| 43 | ussk |
| 50 | ussl |
| 85 | ussm |
| 52 | ussn |
| 162 | usso |
| 197 | ussp |
| 9 | ussq |
| 73 | ussr |
| 92 | usss |
| 235 | usst |
| 115 | ussu |
| 23 | ussv |
| 47 | ussw |
| 2 | ussx |
| 22 | ussy |
| 2 | ussz |