| Area Code▲ | City↕ | Administrative Region↕ | City Population↕ | Country/Region | Timezone |
|---|
| 250 | — | — | 3,205,060 | Mauritania | Africa/Nouakchott |
| 258 | — | — | 3,205,060 | Mauritania | Africa/Nouakchott |
| 45 | Nouakchott | Wilaya de Nouakchott | 661,400 | Mauritania | Africa/Nouakchott |
| 4513 | Néma | Hodh Ech Chargui Region | 60,000 | Mauritania | Africa/Nouakchott |
| 4515 | El Aioun, Mauritania | Assaba Region | — | Mauritania | Africa/Nouakchott |
| 452 | — | — | 3,205,060 | Mauritania | Africa/Nouakchott |
| 4533 | Kaédi | Gorgol Region | 55,374 | Mauritania | Africa/Nouakchott |
| 4534 | Sélibaby | Guidimaka Region | 18,424 | Mauritania | Africa/Nouakchott |
| 4537 | Aleg | Brakna Region | 15,211 | Mauritania | Africa/Nouakchott |
| 4544 | Zouérat | Tiris Zemmour Region | 38,000 | Mauritania | Africa/Nouakchott |
| 4546 | Atar, Mauritania | Adrar Region | 24,021 | Mauritania | Africa/Nouakchott |
| 4550 | Boghé | Brakna Region | — | Mauritania | Africa/Nouakchott |
| 4563 | Kiffa | Assaba Region | 40,281 | Mauritania | Africa/Nouakchott |
| 4569 | Tidjikja | Tagant Region | 6,000 | Mauritania | Africa/Nouakchott |
| 457 | — | — | 3,205,060 | Mauritania | Africa/Nouakchott |
| 4574 | Nouadhibou | Dakhlet Nouadhibou Region | 72,337 | Mauritania | Africa/Nouakchott |