The homonymous lake Koijärvi, from which the Koijoki river starts, is known for the birds which make their nests by it.
Distances
Forssa: ~20 km
Hämeenlinna: 70 km
Tampere: 75 km
Turku: 95 km
Pori: 110 km
Helsinki: 130 km
History
Unofficial coat of arms
Before separation
Koijärvi is named after a nearby lake. While Koijärvi literally means "moth lake", it is not the original name: it was most likely Koivujärvi or "birch lake" instead.
The main village, Kojo, has existed at least since the 17th century. The first mention of it was in 1600 as Quoiuull, "at Kojo" (adessive case, in modern Finnish orthography written Kojolla. Many Tavastian dialects have an apocope of a, pronouncing it as Kojol). The area was mainly within the Tammela parish, originally called Porras.[4]
Independent municipality
Koijärvi became a separate municipality in 1923. It was formed out of parts of Tammela and Urjala. Forssa was also separated from Tammela in the same year.
The old meeting house in Kojo was converted into a church in the 16th of December, 1923. The altarpiece is painted by Elias Muukka. The organ was made in Kangasala in 1968, while the bells were made in Yaroslavl and were originally used in a church built for Russian soldiers in Ekenäs.[5]
Koijärvi was one of the two municipalities without a coat of arms in the 60s, the other being Uudenkaupungin maalaiskunta.
Merger
The Koijärvi municipality was dissolved in 1969. Most of it, including Kojo, was transferred to Forssa in the south, while small portions of the north were given to Urjala.
Services
[6]
Most of Koijärvi's services are located in Kojo.
Education
Kojo has a school for grades 1-6 (ala-aste). A daycare is located in the same building.
