Iizuka is a city in Fukuoka Prefecture, Japan. As of 29 February 2024, the city had an estimated population of 124,757 in 63833 households, and a population density of 580 persons per km². The total area of the city is 213.96 km2 (82.61 sq mi).

Fukuoka Prefecture is a prefecture of Japan located on the island of Kyūshū. Fukuoka Prefecture has a population of 5,109,323 and has a geographic area of 4,986 km2. Fukuoka Prefecture borders Saga Prefecture to the southwest, Kumamoto Prefecture to the south, and Ōita Prefecture to the southeast.