| Rank | Name | Region | Pop. | ||||||
|---|---|---|---|---|---|---|---|---|---|
 Nouakchott  Nouadhibou |
1 | Nouakchott | Nouakchott | 1,195,600 |  Kiffa | ||||
| 2 | Nouadhibou | Dakhlet Nouadhibou | 118,167 | ||||||
| 3 | Kiffa | Assaba | 60,005 | ||||||
| 4 | Néma | Hodh Ech Chargui | 57,000 | ||||||
| 5 | Rosso | Traza | 51,026 | ||||||
| 6 | Kaédi | Gorgol | 45,539 | ||||||
| 7 | Zouérat | Tiris Zemmour | 44,469 | ||||||
| 8 | Sélibaby | Guidimaka | 26,420 | ||||||
| 9 | Atar | Adrar | 25,190 | ||||||
| 10 | Aïoun | Hodh El Gharbi | 22,796 | ||||||