| Country Code | Country Name | 2 Digit Code | 3 Digit Code |
| GG | Guernsey | GG | GGY |
| GH | Ghana | GH | GHA |
| GI | Gibraltar | GI | GIB |
| GL | Greenland | GL | GRL |
| GM | Gambia | GM | GMB |
| GN | Guinea | GN | GIN |
| GP | Guadeloupe | GP | GLP |
| GQ | Equatorial Guinea | GQ | GNQ |
| GR | Greece | GR | GRC |
| GS | South Georgia and South Sandwich Islands | GS | SGS |