Ogi is a city located in the central part of Saga Prefecture on the island of Kyushu, Japan. As of 31 May 2024, the city had an estimated popula…Ogi is a city located in the central part of Saga Prefecture on the island of Kyushu, Japan. As of 31 May 2024, the city had an estimated population of 44,120 in 17,548 households, and a population density of 240 persons per km². The total area of the city is 95.81 km².