Seongnam-si is located in Suwon-si city, South Korea at the 37.4386, 127.1378 coordinates. Distance from Seongnam-si to other cities. are listed below, click on the city name to find distance between. Distance from Seongnam-si to Goyang-si 36 km, to Bucheon-si 32 km, to Ansan-si 31 km. The green marker indicates the location of Seongnam-si.