Iwaki Station is served by both the
Jōban Line and the
Banetsu East Line. It is located 209.4 km from the official starting point of the Jōban Line at in Tokyo. From the
Fukushima Daiichi nuclear disaster in March 2011 to March 2020, Iwaki Station became the northern terminus for limited express train services on the line. The station is also the eastern terminus of the Banetsu East Line and is located 85.6 kilometers from the opposing terminus at . ==Station layout==