In the 10th Korean Standard Industrial Classification (KSIC), the oil refining industry is listed as “Manufacture of refined petroleum products.” The location quotients for the oil refining industry ranked by descending order were Yeosu-si, Seosan-si, Ulsan, Yesan-gun, Yangsan-si; at the -si/-do area levels, the oil refining industry is mainly concentrated in Ulsan, Jeollanam-do, Incheon. The top two oil refining industry regions indicate a relatively high level of the location quotient (over 20), suggesting that the oil refining industry is very unevenly distributed. The number of workers for the oil refining industry ranked by descending order were Ulsan, Jeollanam-do, Incheon. The value added for the oil refining industry ranked by descending order were Jeollanam-do, Ulsan, Incheon. 

In the 10th Korean Standard Industrial Classification (KSIC), the chemical industry is listed as “Manufacture of basic chemicals” and “Manufacture of plastics and synthetic rubber in primary forms.” The location quotients for the chemical industry ranked by descending order were Yeosu-si, Nam-gu in Ulsan, Seosan-si, Jeongseon-gun, Gunsan-si, Geumsan-gun, Yuseong-gu in Daejeon, and Gimcheon-si; at the -si/-do area levels, the chemical industry is mainly concentrated in Jeollanam-do, Ulsan, Chungcheongnam-do, Gyeonggi-do, Jeollabuk-do. The number of workers for the chemical industry ranked by descending order were Jeollanam-do, Ulsan, Gyeonggi-do, Chungcheongnam-do, and Gyeongsangbuk-do. The value added for the chemical industry ranked by descending order were Ulsan, Jeollanam-do, Chungcheongnam-do, Gyeonggi-do, and Jeollabuk-do.