Kokkola (ˈkokːolɑ; Karleby, ˈkɑrleˌbyː) is a town and municipality of Finland. The town is located in the Central Ostrobothnia region. The town has a population of () and covers an area of of which is water. The population density is . Neighbour municipalities are Halsua, Kalajoki, Kannus, Kaustinen, Kronoby, Lestijärvi, Larsmo and Toholampi. The municipality is bilingual with being Finnish and Swedish speakers. Kokkola celebrated its 400th anniversary in 2020. In the oldest Swedish sources Kokkola is mentioned as Karlabi. The town was known in Swedish by the name Gamlakarleby until 1 January 1977 when the surrounding land municipality of Kaarlela (Karleby) was consolidated with Kokkola, and the town took over the Swedish name of Karleby. The word gamla means "old", karl (anglicanized Charles), is a Germanic males name, a name of many kings, meaning simply "man" and by means "village", so the town name is ambiguous meaning both "old village of Charles" or "old man village". The Latin name was Carolina Vetus. Gustav II Adolf, the founder of the city, possibly named the town in honor of his father King Karl IX of Sweden. The Finnish name is possibly derived from Kokkolahti, a narrow bay located at the place of the town. According to a tale the sea eagles (in Finnish merikotka or kokko) used to live there. Another theory claims that the name comes from ancient signal fires (kokko), which were used to warn people about approaphing enemy troops. The coat of arms of Kokkola is based on the city seal issued in 1620 in connection with the founding of the city. The pattern is a symbol of tar burning and tar trade, which have played a significant part in the history of the city since its founding until the 19th century. The coat of arms was designed by Olof Eriksson and Into I. Suominen, and it was confirmed for use on December 17, 1956. The town of Kokkola was chartered in 1620 by King Gustav II Adolf of Sweden when Finland was a part of the Swedish Empire and is one among the oldest towns in Finland.