Nagahama is a city located in Shiga Prefecture, Japan. As of 1 November 2021, the city had an estimated population of 116,043 in 46858 households and a population density of 120 persons per …Nagahama is a city located in Shiga Prefecture, Japan. As of 1 November 2021, the city had an estimated population of 116,043 in 46858 households and a population density of 120 persons per km². The total area of the city is 680.79 square kilometres.