Tsukuba is a city located in Ibaraki Prefecture, Japan. As of January 1, 2024, the city had an estimated population of 256,526 in 121,001 hou…Tsukuba is a city located in Ibaraki Prefecture, Japan. As of January 1, 2024, the city had an estimated population of 256,526 in 121,001 households and a population density of 900 persons per km². The percentage of the population aged over 65 was 20.3%. The total area of the city is 283.72 square kilometres. It is known as the location of the Tsukuba Science City, a planned science park developed in the 1960s.
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