It is located in Northern Savonia, 20 kilometres (12 mi) north of the city of Kuopio, which largely surrounds Siilinjärvi.

The name, in Finnish, apparently translates literally as "Hedgehog's Lake", although its etymology actually stems from a Sámi word meaning "winter dwelling".

Siilinjärvi is the birthplace of politician and former prime minister of Finland and European Commissioner Jyrki Katainen.

[8] The other largest companies in Siilinjärvi are Yara International's factory and apatite mine, Lujabetoni Oy, Hydroline Oy, Recreational Pool Fontanella and Spa Hotel Kunnonpaikka.

At the Tiprusniemi bioheat center, heat is produced with domestic wood fuel.

In addition, it has been proposed to build a third fire station in Siilinjärvi near the Vuorela residential area.

The traditional food of Siilinjärvi was a cockscomb, a potato gruel and a red berry kissel with whipped cream.