887,146 codes across 95 countries, ranked and compared.
| # | Country | Codes | Format |
|---|---|---|---|
| 1 | Portugal | 197,772 | AAAA-AAA |
| 2 | Japan | 142,577 | AAA-AAAA |
| 3 | Singapore | 121,135 | AAAAAA |
| 4 | Russia | 43,538 | AAAAAA |
| 5 | United States | 41,488 | AAAAA |
| 6 | Romania | 37,914 | AAAAAA |
| 7 | South Korea | 34,249 | AAAAA |
| 8 | Mexico | 32,448 | AAAAA |
| 9 | Ukraine | 26,579 | AAAAA |
| 10 | France | 20,416 | AAAAA AAAAA |
| 11 | Poland | 20,299 | AA-AAA |
| 12 | India | 19,238 | AAAAAA |
| 13 | Sweden | 18,887 | AAA AA |
| 14 | Spain | 11,150 | AAAAA |
| 15 | Germany | 10,813 | AAAAA |
| # | Country | Codes | Format |
|---|---|---|---|
| 1 | Vatican City | 1 | AAAAA |
| 2 | Saint Pierre and Miquelon | 1 | AAAAA |
| 3 | Palau | 1 | AAAAA |
| 4 | Monaco | 1 | AAAAA |
| 5 | American Samoa | 1 | AAAAA |
| 6 | Marshall Islands | 2 | AAAAA |
| 7 | Wallis and Futuna | 3 | AAAAA |
| 8 | Northern Mariana Islands | 3 | AAAAA |
| 9 | Micronesia | 4 | AAAAA |
| 10 | Jersey | 4 | AAA |
| 11 | Andorra | 7 | AAAAA |
| 12 | Svalbard and Jan Mayen | 8 | AAAA |
| 13 | Isle of Man | 9 | AAA |
| 14 | San Marino | 10 | AAAAA |
| 15 | Guernsey | 10 | AAA |
Counts reflect the GeoNames open dataset (CC BY 4.0), refreshed monthly, and can differ from official operator totals: some countries publish only outward or area-level codes openly (the UK, for example, is counted by outward codes such as SW1A). Format patterns show N for a digit and A for a letter.