| Vorwahl | Ortsname | Ortsteil | Landkreis | Bundesland |
|---|---|---|---|---|
| 05551 | Northeim | Northeim | Niedersachsen | |
| 05551 | Northeim | Berwartshausen Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Brunstein Stadt Northeim | Northeim | Niedersachsen |
| 05503 | Northeim | Bühle Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Denkershausen Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Edesheim Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Güntgenburg Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Hammenstedt Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Hillerse Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Höckelheim Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Hohnstedt Stadt Northeim | Northeim | Niedersachsen |
| 04165 | Northeim | Hollenstedt Nordheide | Northeim | Niedersachsen |
| 05551 | Northeim | Hollenstedt Stadt Northeim | Northeim | Niedersachsen |
| 05553 | Northeim | Imbshausen Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Lagershausen Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Langenholtensen Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Levershausen Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Mandelbeck Stadt Northeim | Northeim | Niedersachsen |
| 05554 | Northeim | Schnedinghausen Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Stöckheim Stadt Northeim | Northeim | Niedersachsen |
| 05503 | Northeim | Sudheim Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Wetze Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Wickershausen Stadt Northeim | Northeim | Niedersachsen |
| 05551 | Northeim | Wiebrechtshausen Stadt Northeim | Northeim | Niedersachsen |
