Koga is a city located in Fukuoka Prefecture, Japan. As of 29 February 2024, the city had an estimated population of 59,282 in 26981 households, and a population density of 1400 persons per km². The total area of the city is 42.07 km2 (16.24 sq mi).

Hisayama is a town located in Kasuya District, Fukuoka Prefecture, Japan. As of 29 February 2024, the town had an estimated population of 9355 in 3836 households, and a population density of 250 persons per km². The total area of the town is 37.44 km2 (14.46 sq mi)