Lohja is a town located in the southern interior of Finland within the western portion of the Uusimaa region. It serves as a significant municipality in the area, with a population of approximately 45,000 residents. Based on its population size, it ranks as the 25th most populous municipality in the country.
While Lohja is situated within the Helsinki sub-region, it is not considered part of the immediate Helsinki metropolitan area. The town is characterized by its location in the southern interior and its position within the Uusimaa region's western reaches.