| Area Code▲ | City↕ | Administrative Region↕ | City Population↕ | Country/Region | Timezone |
|---|
| 5503 | Northeim | Lower Saxony | 30,894 | Germany | Europe/Berlin |
| 5551 | Northeim | Lower Saxony | 30,894 | Germany | Europe/Berlin |
| 5553 | Northeim | Lower Saxony | 30,894 | Germany | Europe/Berlin |
| 5554 | Northeim | Lower Saxony | 30,894 | Germany | Europe/Berlin |