In the twentieth century, various mergers joined the castle town with neighboring Dōgo, Mitsuhama, and other townships, aided by urban sprawl, creating a seamless modern city that now ranks as the largest in Shikoku. As of the most recent merger, on January 1, 2005, joining the city of Hōjō and town of Nakajima (from the former Onsen District) with Matsuyama, the city had an estimated population of 512,982 and a density of 1196 persons per km². The total (merged) area is 428.86 km².
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