Cheonan is a locality located 85.02 km north from Seoul in South Chungcheong, South Korea. The population of Cheonan is 651,661 people. Anseong, Cheongju, Gongju are located close to Cheonan. You can find Cheonan on any map using the following decimal coordinates: 36.8064 (latitude), 127.1522 (longitude).