| Area Code▲ | City↕ | Administrative Region↕ | City Population↕ | Country/Region | Timezone |
|---|
| 5202 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5203 | Werther, North Rhine-Westphalia | North Rhine-Westphalia | 11,575 | Germany | Europe/Berlin |
| 5204 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5205 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5206 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5207 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5208 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5209 | Gütersloh | North Rhine-Westphalia | 96,180 | Germany | Europe/Berlin |
| 521 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5221 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5225 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |
| 5241 | Bielefeld | North Rhine-Westphalia | 331,906 | Germany | Europe/Berlin |