Karadeniz Bölgesi’nde, Samsun iline bağlı ilçe ve ilçe merkezi kasaba. Eskiden Çarşamba’ya bağlı bir bucak olan Ayvacık, 9 Mayıs 1990 tarihli ve 3644 sayılı yasayla ilçe yapılmıştır. Nüfus (1990) ilçe, 28.112; kasaba, 5.375.
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