In 1924 Töre Municipality was detached from Nederkalix Municipality, forming a municipality of its own. In 1967 the two units were reunified, and the present municipality was created.
In historical times, Kalix was the name of the court district (Swedish: domsaga) Kalix Lower Court District. It covered two parishes: Lower and Upper Kalix (Swedish: Nederkalix and Överkalix, respectively). The chalice on the coat of arms was present in the Nederkalix coat of arms in 1800, and was incorporated into that of Kalix Municipality in 1989. The choice of symbol originates from the similarity between the Latin root of chalice, calix, mug (itself borrowed from Greek kalyx, κάλυξ, shell, husk) and the local Sami pronunciation of Gáláseatnu, an ancient name for the Kalix River.
The municipal seat in bold
These are the results of the elections to the Riksdag since the 1972 municipal reform. Norrbotten Party also contested the 1994 election but due to the party's small size at a nationwide level SCB did not publish the party's results at a municipal level. The same applies to the Sweden Democrats between 1988 and 1998. "Turnout" denotes the percentage of eligible voters casting any ballots, whereas "Votes" denotes the number of actual valid ballots cast.
This lists the relative strength of the socialist and centre-right blocs since 1973, but parties not elected to the Riksdag are inserted as "other", including the Sweden Democrats results from 1988 to 2006, but also the Christian Democrats pre-1991 and the Greens in 1982, 1985 and 1991. The sources are identical to the table above. The coalition or government mandate marked in bold formed the government after the election. New Democracy got elected in 1991 but are still listed as "other" due to the short lifespan of the party.
The extent of the Kalix Municipality is based on the traditional extent of the Kalix dialect, although slight (sub-)dialectal differences can be found from Sangis in the east, Töre in the west and Övermorjärv in the north. Today it is spoken along with Sami, Finnish, Meänkieli, Upper Kalix dialect, and the national standard language Swedish, which has replaced the Kalix as dialect as the common language in everyday life. Like other North Germanic languages the Kalix dialect originates from Old Norse and Proto-Norse, spoken by immigrating Germanic settlers during the Viking Age.
Kalix Municipality has one sister city:
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