In 2003, the town had an estimated population of 13,023 and a population density of 198.55 persons per km². The total area was 65.59 km². The primary industry was rice farming. There was also a chemical plant.
On March 31, 2006, Tajiri, along with the city of Furukawa, the towns of Iwadeyama and Naruko (both from Tamatsukuri District), and the towns of Kashimadai, Matsuyama and Sanbongi (all from Shida District), was merged to create the city of Ōsaki. Tamatsukuri District and Shida District were dissolved as a result of this merger.