Siuntio
| Siuntio | |
|---|---|
| Municipality | |
| Siuntion kunta Sjundeå kommun | |
| St. Peter's Church in Siuntio | |
| Motto: Ota rauhallisesti – Ta det lugnt | |
| Location of Siuntio in Finland | |
| Coordinates: 60°08′15″N 24°13′35″E / 60.13750°N 24.22639°E | |
| Country | Finland | 
| Region | Uusimaa | 
| Sub-region | Helsinki sub-region | 
| Year when first mentioned | 1382 | 
| Seat | Siuntion asemanseutu | 
| Government | |
| • Municipality manager | Inka Tikkanen | 
| Area  (2018-01-01) | |
|  • Total | 266.12 km2 (102.75 sq mi) | 
| • Land | 241.27 km2 (93.15 sq mi) | 
| • Water | 24.96 km2 (9.64 sq mi) | 
| • Rank | 249th largest in Finland | 
| Population  (2025-03-31) | |
|  • Total | 6,199 | 
| • Rank | 151st largest in Finland | 
| • Density | 25.69/km2 (66.5/sq mi) | 
| Population by native language | |
| • Finnish | 65.2% (official) | 
| • Swedish | 26.2% (official) | 
| • Others | 8.6% | 
| Population by age | |
| • 0 to 14 | 17.3% | 
| • 15 to 64 | 63% | 
| • 65 or older | 19.7% | 
| Time zone | UTC+02:00 (EET) | 
| • Summer (DST) | UTC+03:00 (EEST) | 
| Climate | Dfb | 
| Website | www | 
Siuntio (Finnish: [ˈsiu̯ntio]; Swedish: Sjundeå) is a municipality in the Uusimaa region of Southern Finland. Its neighboring municipalities are Ingå to the west, Kirkkonummi to the east, Lohja to the north-west, and Vihti to the north. It is 46 kilometres (29 mi) west of Helsinki.
As of 2021, the population was 6,199 with a population density of 25.69 inhabitants per square kilometre (66.5/sq mi). The municipality covers an area of 266.12 square kilometres (102.75 sq mi), of which 24.96 km2 (9.64 sq mi) is water.
Siuntio is a bilingual municipality with Finnish and Swedish as its official languages. The population consists of 65% Finnish speakers, 26% Swedish speakers, and 9% speakers of other languages. Previously, the majority of the population spoke Swedish until the 1980s.
Siuntio's motto is "Ota rauhallisesti – Ta det lugnt", which means "take it easy" in Finnish and Swedish respectively. The municipality's rebranding program introduced the new motto along with a new logo in 2021.