| 1 | GRD | National Grid Co plc | Callsign: Grid, | GB | AVCODES |
| 2 | GRD | National Grid | | | ICAO1 |
| 3 | GRDB | GAEBEL MICHIGAN MOVERS INC | | | SCAC4 |
| 4 | GRDD | GARDNER OIL INC | | | SCAC4 |
| 5 | GRDE | GALLEGOS ROMAN, DORA ALICIA | | | SCAC4 |
| 6 | GRDI | GUERRERO, ROLANDO INC | | | SCAC4 |
| 7 | GRDK | GRUPO INDUSTRIAL DE SISTEMA DE CONF | | | SCAC4 |
| 8 | GRDL | GORDON LOGISTICS LLC | | | SCAC4 |
| 9 | GRDN | GARDNER GAS HAULING INC | | | SCAC4 |
| 10 | GRDO | GRAND UNION CO | | | SCAC4 |
| 11 | GRDQ | GREEN, DENNIS & SONS | | | SCAC4 |
| 12 | GRDS | GERALDOS TRUCKING CORP | | | SCAC4 |
| 13 | GRDT | GARDNER TRANSPORT LLC | | | SCAC4 |
| 14 | GRDU | TOUAX GROUP | | F | BIC |
| 15 | GRDU | GOLD CONTAINER CORP | | | SCAC4 |
| 16 | GRDW | GRANT, DAVE, HAY, INC | | | SCAC1 |
| 17 | GRDW | GRANT, DAVE R HAY INC | | | SCAC4 |
| 18 | GRDX | Grand River Dam Authority | added 10/1978; eliminated 4/1979; added 1/1981; 1/1994-7/2000; eliminated 7/2001; 7/2005 (not listed) | | NAKINA |
| 19 | GRDX | Grand River Dam Authority | added 10/78; eliminated 4/79; added 1/81; 1/94-7/2000; eliminated 7/2001 | | NRHS |
| 20 | GRDX | GRAND RIVER DAM AUTHORITY | | | PWRC |
| 21 | GRDX | Grand River Dam Authority | | | RSRV |
| 22 | GRDX | GRAND RIVER DAM AUTHORITY | | | SCAC4 |
