| Total population | 26,500,000 peopleUN DESA WPP [2024] 26,500,000 people·World Bank WDI [2024] 26,500,000 people |
| Median age | 36.3 yearsUN DESA WPP [2024] |
| Life expectancy | 73.6–73.7 yearsWorld Bank WDI [2024] 73.74 years·UNDP HDI [2023] 73.64 years |
| Ethnic groups | racially homogeneous; there is a small Chinese community and a few ethnic JapaneseCIA World Factbook [2025] · 2026 archive |
| Languages | KoreanCIA World Factbook [2025] · 2026 archive |
| Religions | traditionally Buddhist and Confucian, some Christian and syncretic Chondogyo (Religion of the Heavenly Way); note: autonomous religious activities now almost nonexistent; government-sponsored religious groups exist to provide illusion of religious freedomCIA World Factbook [2025] · 2026 archive |
| Urbanization | 63.2% of total population (2023)CIA World Factbook [2025] · 2026 archive |
| Population growth | 0.305 %World Bank WDI [2024] |
| Birth rate | 12.9 per 1,000World Bank WDI [2024] |
| Death rate | 9.86 per 1,000World Bank WDI [2024] |
| Urban population | 63.9 %World Bank WDI [2024] |
| Languages (structured) | Korean / Mandarin Chinese / RussianGlottolog [2026] |