50 cities
| City | 2025 Pop. ↓ |
|---|---|
| Oberhausen | 210,934 |
| Osnabrueck | 166,462 |
| Oldenburg | 163,830 |
| Offenbach | 119,192 |
| Offenburg | 59,238 |
| Oberursel | 42,448 |
| Oranienburg | 40,793 |
| Ostfildern | 33,598 |
| Ottensen | 32,757 |
| Osterholz-Scharmbeck | 31,405 |
| Oer-Erkenschwick | 30,409 |
| Oelde | 29,297 |
| Overath | 27,203 |
| Olpe | 25,686 |
| Obertshausen | 24,459 |
| Olching | 23,978 |
| Opladen | 23,000 |
| Ohringen | 22,765 |
| Oberkirch | 20,375 |
| Ochtrup | 19,441 |
| Ottobrunn | 19,204 |
| Oberschoneweide | 18,919 |
| Oschersleben | 17,900 |
| Oerlinghausen | 17,403 |
| Oberasbach | 17,306 |
| Oschatz | 16,000 |
| Olsberg | 15,814 |
| Odenthal | 15,619 |
| Ottweiler | 15,503 |
| Ober-Ramstadt | 15,367 |
| Oyten | 15,286 |
| Ohlsdorf | 14,942 |
| Oberndorf | 14,740 |
| Ostringen | 12,880 |
| Oelsnitz | 12,686 |
| Oberhaching | 12,470 |
| Oelsnitz | 12,268 |
| Ottersberg | 12,205 |
| Olfen | 12,133 |
| Osterhofen | 11,870 |
| Ostheim | 11,689 |
| Ochsenfurt | 11,492 |
| Oberschleissheim | 11,290 |
| Olbernhau | 11,162 |
| Ostrhauderfehn | 10,699 |
| Ostbevern | 10,644 |
| Oberderdingen | 10,515 |
| Obernkirchen | 10,120 |
| Oftersheim | 10,100 |
| Ottendorf-Okrilla | 10,093 |