| BO | - | Bochum |
| BOT | - | Bottrop |
| D | - | Düsseldorf |
| DO | - | Dortmund |
| DU | - | Duisburg |
| E | - | Essen |
| EN | - | Ennepe-Ruhr-Kreis |
| GE | - | Gelsenkirchen |
| HA | - | Hagen |
| HER | - | Herne |
| KR | - | Krefeld |
| ME | - | Mettmann |
| MG | - | Mönchengladbach |
| MH | - | Mülheim |
| NE | - | Neuss |
| OB | - | Oberhausen |
| RS | - | Remscheid |
| SG | - | Solingen |
| W | - | Wuppertal |
| Nordrhein-Westfalen (Ruhrgebiet) |
