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As of 2003, the city has an estimated population of 31,860 and a density of 332.19 persons per kmē. The total area is 95.91 kmē.
The city was founded on February 11, 1935.
Yawatahama has a small port which provides regular ferry services to the cities of Usuki, Oita and Oita, Oita on Kyushu.