Somero is a town and municipality of Finland. It is part of the Southwest Finland region in the province of Western Finland, located 36 kilomet…Somero is a town and municipality of Finland. It is part of the Southwest Finland region in the province of Western Finland, located 36 kilometres northeast of Salo, 86 kilometres east of Turku and 105 kilometres northwest of Helsinki. The municipality has a population of 8,439 and covers an area of 697.67 square kilometres of which 29.9 km² is water. The population density is 12.63 inhabitants per square kilometre. Somero is unilingually Finnish.