Mariental's 2026 population is now estimated at 20,406. In 1991, the population of Mariental was 7,581. Mariental has grown by 659 in the last year, which represents a 3.34% annual change. These population values and projections come from Namibia city census series 1981-2023 via CityPopulation official attribution, Namibia 2023 PHC main report Table 4.5 urban centres and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Windhoek | 537,336 | 3.39% |
| Rundu | 137,831 | 5.13% |
| Walvis Bay | 116,471 | 4.28% |
| Swakopmund | 86,659 | 4.51% |
| Oshakati | 66,023 | 4.02% |
| Otjiwarongo | 56,265 | 4.7% |
| Okahandja | 52,494 | 5.13% |
| Katima Mulilo | 52,478 | 4.19% |
| Rehoboth | 44,479 | 2.93% |
| Tsumeb | 40,571 | 5.09% |
| Gobabis | 38,433 | 4.77% |
| Ongwediva | 38,381 | 4.35% |
| Ondangwa | 32,611 | 2.41% |
| Helao Nafidi | 32,241 | 3.45% |
| Keetmanshoop | 30,482 | 3.04% |
| Grootfontein | 30,402 | 4.24% |
| Mariental | 20,406 | 3.34% |
| Eenhana | 19,273 | 5.13% |
| Outjo | 17,407 | 4.94% |
| Luderitz | 17,213 | 2.14% |
