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| WWVB | WWVC | WWVH | WWW | WWWP | WY1 |
| WYS | WYT | WYV1 | WYW | WZC | WZCS |
| WZI | WZS | WZSP | X | X/XOD | XAC |
| XAS | XBF-1 | XCI | XCIRC | XCIRCD | XCN |
| XDG | XDR | XDR TB | XDS | XEF | XEF-1A |
| XET | XGC | XGH | XGHR | XGN | XI |
| XIC | XID | XIF | XIP | XIS | XIST |
| XL | XLA | XLH | XLO | XLP | XLPS |
| XLS | XMRV | XN | XO | XOD | XOOP |
| XOP | XP | XPV | XQ-9302 | XR | XRE |
| XRT | XS | XT | XTH | xx | XXY |
| XY | XYD | XYG | XYK | XYL | XZ |
| Y/A | Y/N | Y/O | YAC | YACV | YAFS |
| YAP | YAS | YASAP | YB | YB-1 | YBCU |
| YBT | YCD | YCM | YCS | YCT | YD |
| YDH | YDU | YE | YEG | YESS | YF |
| YF-VAX | YFG | YFH | YFHS | YFP | YFV |