Koga is a city located in Ibaraki Prefecture, Japan. As of 1 October 2020, the city had an estimated population of 138,446 in 56,097 households and a population density of 1120 persons per km². The percentage of the population aged over 65 was 28.98%. The total area of the city is 123.58 square kilometres.
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Coordinates 36°10'40.89" N 139°45'19.31" E
