Siikainen's 2026 population is now estimated at 1,200. In 1972, the population of Siikainen was 2,971. Siikainen experienced a decrease of -32 residents over the past year, marking an annual decline of -2.6%. These population values and projections come from Statistics Finland 11re municipality population 31 Dec and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Helsinki | 696,374 | 0.9% |
| Espoo | 334,953 | 2.16% |
| Tampere | 269,746 | 1.82% |
| Vantaa | 258,585 | 1.45% |
| Oulu | 220,742 | 1.06% |
| Turku | 211,512 | 1.31% |
| Jyvaskyla | 152,051 | 0.95% |
| Kuopio | 128,299 | 1.04% |
| Lahti | 121,905 | 0.23% |
| Pori | 83,012 | -0.18% |
| Joensuu | 79,502 | 0.48% |
| Kouvola | 76,915 | -0.94% |
| Lappeenranta | 73,584 | 0.18% |
| Vaasa | 71,434 | 0.76% |
| Hameenlinna | 68,749 | 0.23% |
| Seinajoki | 67,839 | 0.92% |
| Rovaniemi | 66,841 | 0.85% |
| Porvoo | 52,254 | 0.5% |
| Mikkeli | 51,420 | -0.45% |
| Salo | 50,494 | -0.37% |
