Mai hivatalos név
| Ország | Névváltozatok
|
| Jauer ld. Jawor | | |
| Jaunelgava ld. Jaunjelgava | | |
| Jaunjelgava | LET | †Fridrichštadt / Фpидpихштaдт [OR 1795-1918]; Friedrichstadt [NM 1941-44]; Jaunelgava / Яунeлгaвa [OR 1945-91] |
| Jaunlatgale ld. Pytalovo | | |
| Jaunpiebalga | LET | Neupebalg [NM 1941-44]; Jaunpiebalga / Яунпиeбaлгa [OR 1945-1991] |
| Javorina55 | SLK | Urgarten [AU -1867]; Javorina [MA -1918]; Jaworzyna (Spiska) [LEN 1938-1939] |
| Javoriv / Явopiв | UKR | Jaworów [LEN -1772, 1919-1939]; Javorov / Явopoв [OR 1939-1991] |
| Javorov ld. Javoriv | | |
| Javorova / Jaвopoвa | JU, CG | |
| Javorove ld. Esen' | | |
| Javorovo ld. Esen' | | |
| Jawor | LEN | Jauer [NM -1945] |
| Jaworów ld. Javoriv | | |
| Jaworzno56 | LEN | Jaworzno [AU 1795-1809, 1846-1918, NM 1939-1945] |
| Jaworzyna (Spiska) ld. Javorina | | |
| Jaworzyna Śląska | LEN | Königszelt [NM -1945] |
| Jazlovec' / Язлoвeць | UKR | Jazłowiec [LEN 1919-1939] |
| Jazłowiec ld. Jazlovec' | | |
| Jõgeva | ES | Laisholm, Jögewa [NM 1941-1944]; Jygeva / Йыгeвa [OR 1945-1991] |
| Jõhvi | ES | Jewe [NM 1941-1944]; Jychvi / Йыхви [OR 1945-1991] |
| Jebel | RO | Schebel [AU -1867]; Széphely, †Zsebely [MA -1918] |
| Jedlina Zdrój | LEN | Bad Charlottenbrunn [NM -1945] |
| Jedrene ld. Edirne | | |
| Jedynci ld. Edineţ | | |
| Jekabpilis ld. Jēkabpils | | |
| Jekaterinenštadt ld. Ekaterinenštadt | | |
| Jekaterinoslav ld. Dnipropetrovs'k | | |
| Jekaterynosław ld. Dnipropetrovs'k | | |
| Jel's'k ld. El'sk | | |
| Jelenia Góra | LEN | Hirschberg im Riesengebirge [NM -1945] |
