| Esperanto | epo-000 |
| Northumberland | |
| català | cat-000 | Northumberland |
| 國語 | cmn-001 | 諾森伯蘭郡 |
| Kernowek | cor-000 | Northumberland |
| Cymraeg | cym-000 | Northumberland |
| Deutsch | deu-000 | Northumberland |
| eesti | ekk-000 | Northumberland |
| English | eng-000 | Northumberland |
| euskara | eus-000 | Northumberland |
| suomi | fin-000 | Northumberland |
| français | fra-000 | Northumberland |
| Srpskohrvatski | hbs-001 | Northumberland |
| हिन्दी | hin-000 | नॉर्थम्बरलैंड |
| íslenska | isl-000 | Northumberland |
| italiano | ita-000 | Northumberland |
| 日本語 | jpn-000 | ノーサンバーランド |
| Lëtzebuergesch | ltz-000 | Grofschaft Northumberland |
| Nederlands | nld-000 | Northumberland |
| bokmål | nob-000 | Northumberland |
| polski | pol-000 | Northumberland |
| português | por-000 | Northumberland |
| română | ron-000 | Northumberland |
| русский | rus-000 | Нортумберленд |
| lingua siciliana | scn-000 | Northumberland |
| slovenčina | slk-000 | Northumberland |
| español | spa-000 | Northumberland |
| svenska | swe-000 | Northumberland |
| Volapük | vol-000 | Northumberland |