| 1 | YDC | YANKEE DOT CORP. | | | PWRC |
| 2 | YDC | Yankeetown Docks Corporation | | USA | TRAFFIC |
| 3 | YDCS | YAZICI DEMIR CELIK SANAYI VE TURIZM | | | SCAC4 |
| 4 | YDCX | Yankeetown Dock Corp. | added 7/1979; 1/1980; eliminated 1/1980 | | NAKINA |
| 5 | YDCX | Peabody Coalsales Co. | added 7/2005; 7/2005 | | NAKINA |
| 6 | YDCX | Yankeetown Dock Corp. | added 7/79; 1/80; eliminated 1/80 | | NRHS |
| 7 | YDCX | *YANKEETOWN DOCK CORP. | | | PWRC |
| 8 | YDCX | +PEABODY COALSALES CO. | | | PWRC |
| 9 | YDCX | PEABODY COALSALES COMPANY | | | SCAC4 |
