| Language | Name | Code |
|---|---|---|
| Aragonese | Koper | an |
| Arabic | كوبر | ar |
| arz | كوبر | arz |
| Asturian | Koper | ast |
| Azerbaijani | Koper | az |
| Bashkir | Копер | ba |
| Belarusian | Копер | be |
| be-tarask | Копэр | be-tarask |
| Bulgarian | Копер | bg |
| Bengali | কাপার | bn |
| Breton | Koper | br |
| Bosnian | Koper | bs |
| Catalan | Koper | ca |
| Cebuano | Koper (munisipyo) | ceb |
| Central Kurdish | کۆپەر | ckb |
| Czech | Koper | cs |
| Welsh | Koper | cy |
| Danish | Koper | da |
| German | Koper | de |
| Modern Greek (1453-) | Κόπερ | el |
| English | Koper | en |
| Esperanto | Kapodistrio | eo |
| Spanish | Koper | es |
| Estonian | Koper | et |
| Basque | Koper | eu |
| Persian | کپر، اسلوونی | fa |
| Finnish | Koper | fi |
| French | Koper | fr |
| fur | Cjaudistrie | fur |
| Irish | Koper | ga |
| Galician | Koper | gl |
| Gujarati | કોપર | gu |
| Hebrew | קופר | he |
| Hindi | कोपेर | hi |
| Croatian | Kopar | hr |
| Upper Sorbian | Koper | hsb |
| Hungarian | Koper | hu |
| Armenian | Կոպեր | hy |
| Indonesian | Koper | id |
| Interlingue | Koper | ie |
| Italian | Capodistria | it |
| Japanese | コペル | ja |
| Georgian | კოპერი | ka |
| Kannada | ಕೊಪರ್ | kn |
| Korean | 코페르 | ko |
| Latin | Iustinopolis | la |
| Lithuanian | Koperis | lt |
| Latvian | Kopera | lv |
| mdf | Копэр | mdf |
| Macedonian | Копер | mk |
| Marathi | कूपर | mr |
| Malay (macrolanguage) | Koper | ms |
| Norwegian Bokmål | Koper | nb |
| Dutch | Koper | nl |
| Norwegian Nynorsk | Koper | nn |
| Occitan (post 1500) | Koper | oc |
| Polish | Koper | pl |
| pnb | کوپر | pnb |
| Pushto | کپر | ps |
| Portuguese | Koper | pt |
| Romanian | Koper | ro |
| Russian | Копер | ru |
| Scots | Koper | sco |
| sh | Koper | sh |
| Sinhala | කොපර් | si |
| Slovak | Koper | sk |
| Slovenian | Koper | sl |
| Albanian | Koper | sq |
| Serbian | Копар | sr |
| Swedish | Koper | sv |
| Tamil | கொபர் | ta |
| Telugu | కోపర్ | te |
| Tajik | Купер | tg |
| Thai | โคเปอร์ | th |
| Turkish | Koper | tr |
| Tatar | Копер | tt |
| Ukrainian | Копер | uk |
| Urdu | کوپر | ur |
| vec | Capodistria | vec |
| Vietnamese | Koper | vi |
| Volapük | Koper | vo |
| war | Koper | war |
| Wu Chinese | 科佩尔 | wuu |
| Chinese | 科佩尔 | zh |