Sennan is a city located in Osaka Prefecture, Japan. As of 31 December 2021, the city had an estimated population of 60,318 in 26214 house…Sennan is a city located in Osaka Prefecture, Japan. As of 31 December 2021, the city had an estimated population of 60,318 in 26214 households and a population density of 1200 persons per km². The total area of the city is 48.98 square kilometres.
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