| Port Code | Port Name | Country |
| USGBB | Gibbsboro | United States |
| USGBC | Gibson City | United States |
| USGBD | Great Bend | United States |
| USGBE | Gilbert | United States |
| USGBG | Galesburg | United States |
| USGBH | Galbraith Lake | United States |
| USGBI | Greenbrier, Robertson | United States |
| USGBL | Braselton | United States |
| USGBM | Glen Burnie | United States |
| USGBO | Greensboro | United States |
| USGBR | Great Barrington | United States |
| USGBS | Greensboro | United States |
| USGBT | Gainesboro | United States |
| USGBU | Grantsburg | United States |
| USGBY | Granbury | United States |
| USGCA | Golconda | United States |
| USGCC | Gillette | United States |
| USGCD | Glen Allen | United States |
| USGCE | Grace | United States |
| USGCG | Garden City | United States |
| USGCH | Gerlach | United States |
| USGCI | Gas City | United States |
| USGCK | Garden City | United States |
| USGCL | Coolidge | United States |
| USGCM | Garden City | United States |
| USGCN | Grand Canyon | United States |
| USGCO | Grand Coulee | United States |
| USGCP | Green Springs | United States |
| USGCQ | Garden City | United States |
| USGCS | Green Cove Springs | United States |
| USGCT | Gilcrest | United States |
| USGCU | Grand Chute | United States |
| USGCV | Graceville | United States |
| USGCY | Greenville | United States |
| USGDA | Glendale | United States |
| USGDD | Giddings | United States |
| USGDE | Gladstone | United States |
| USGDF | Godfrey | United States |
| USGDG | Grand Ledge | United States |
| USGDH | Golden Horn | United States |
| USGDI | Grandville | United States |
| USGDL | Glendale | United States |
| USGDM | Gardner | United States |
| USGDN | Gardiner | United States |
| USGDO | Golden | United States |
| USGDP | Grand Prairie | United States |
| USGDQ | Glendora | United States |
| USGDR | Gardiner | United States |
| USGDT | Goodlettsville | United States |
| USGDV | Glendive | United States |
| USGDW | Gladwin | United States |
| USGDY | Gardner | United States |
| USGDZ | Gardner | United States |
| USGEA | Germantown | United States |
| USGEB | Greenboro | United States |
| USGEC | Garden City | United States |
| USGED | Georgetown | United States |
| USGEE | Glendale | United States |
| USGEF | Glenford | United States |
| USGEG | Spokane | United States |
| USGEH | McGehee | United States |
| USGEI | Greenfield | United States |
| USGEK | Ganes Creek | United States |
| USGEL | Glen Ellyn | United States |
| USGEM | Glenmoore | United States |
| USGEN | Geneva | United States |
| USGEO | Georgetown | United States |
| USGEQ | Georgetown | United States |
| USGER | Georgetown | United States |
| USGES | Geneseo | United States |
| USGET | Gravette | United States |
| USGEU | Glen Allen | United States |
| USGEV | Geneva | United States |
| USGEW | Georgetown | United States |
| USGEY | Greybull | United States |
| USGFA | Granite Falls | United States |
| USGFB | Togiak Fish | United States |
| USGFC | Greenfield | United States |
| USGFD | Greenfield | United States |
| USGFE | Gallipolis Ferry | United States |
| USGFH | Greenfield | United States |
| USGFI | Griffin | United States |
| USGFK | Grand Forks | United States |
| USGFL | Glens Falls | United States |
| USGFN | Grafton | United States |
| USGFO | Grafton | United States |
| USGFQ | Grove | United States |
| USGFR | Garfield | United States |
| USGFT | Grafton | United States |
| USGFV | Grandview | United States |
| USGFW | Goffstown | United States |
| USGFY | Glenns Ferry | United States |
| USGGA | Georgia | United States |
| USGGE | Georgetown | United States |
| USGGG | Longview-Kilgore-Gladewater Apt | United States |
| USGGG | Gladewater-Longview-Kilgore Apt | United States |
| USGGG | Kilgore-Gladewater-Longview Apt | United States |
| USGGH | Greenville | United States |
| USGGO | Gouldsboro | United States |
| USGGP | Goodman | United States |