Ulsan's 2026 population is now estimated at 918,482. In 1950, the population of Ulsan was 29,434. Ulsan has grown by 2,246 in the last year, which represents a 0.25% annual change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Ulsan, which typically includes Ulsan's population in addition to adjacent suburban areas.
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Seoul | 10,050,200 | 0.24% |
| Busan | 3,492,730 | 0.24% |
| Incheon | 2,884,820 | 0.39% |
| Daegu | 2,184,070 | 0.14% |
| Gwangju | 1,540,890 | 0.27% |
| Gwangju | 1,540,890 | 0.27% |
| Daejeon | 1,538,394 | 1.01% |
| Suwon | 1,194,313 | 1.03% |
| Changwon | 1,059,130 | 0.2% |
| Cheonan | 717,256 | 0.55% |
| Jeonju | 669,579 | 0.25% |
| Namyangju | 629,061 | 1.04% |
| Gumi | 402,995 | 0.47% |
| Pohang | 368,816 | 0.36% |
| Wonju | 330,854 | 1.01% |
| Asan | 319,929 | 1.03% |
| Iksan | 301,723 | 1% |
| Yangsan | 297,532 | 1.04% |
| Chuncheon | 281,596 | 1.01% |
| Gunsan | 275,155 | 1.01% |
| Yeosu | 273,761 | 1% |
| Suncheon | 265,390 | 1.01% |
| Gyeongju | 262,310 | 1.01% |
| Mokpo | 239,524 | 0.99% |
| Gangneung | 215,677 | 1% |
| Osan | 213,840 | 1.03% |
| Yangju | 205,988 | 1.02% |
| Sejong | 204,088 | 1.2% |
| Anseong | 194,765 | 1.02% |
| Seosan | 169,221 | 1.02% |
| Andong | 168,581 | 1% |
| Hanam | 154,838 | 1.02% |
| Seogwipo | 153,861 | 1.03% |
| Gimcheon | 137,540 | 1.02% |
| Nonsan | 124,246 | 1.01% |
| Gongju | 113,542 | 0.99% |
| Jeongeup | 110,627 | 1% |
| Yeoju | 109,937 | 1.02% |
| Miryang | 103,069 | 1.01% |
| Sangju | 98,760 | 1% |
| Naju | 92,582 | 1.04% |
| Sokcho | 79,846 | 1% |
| Mungyeong | 71,863 | 1.01% |