[7] The Kymi Ring motor sport center is located in Iitti, right next to the border of Kouvola.

[8] The surroundings of lakes Urajärvi and Pyhäjärvi have been known to be exploited as wilderness since the Stone Age, although no signs of permanent habitation from the era have been found, and the area is presumed to have been entirely uninhabitated in the interim between the Stone Age and the conversion of Finland to Christianity.

[9] The oldest village in Iitti is presumed to be Kauramaa, though several others are mentioned in documents dating to the Middle Ages.

[9] Iitti suffered greatly over the Russo-Swedish War of 1788–1790, becoming a battleground as well as a headquarters for Swedish forces.

The battle of Tillolankangas was one of the bloodiest over the entire war in Finland; the Swedes' victory cemented the liberation of the villages around river Kymi.

[19] Iitti has its own local newspaper called Iitinseutu, whose editorial office is located in Kausala.

[20] The 2023 Finnish slasher horror film The Island of Doom (Tuomion saari), directed by Keke Soikkeli, was shot in Iitti.