Approximately half (47%) of the city's inhabitants are either serving in the South Korean army, or are family of service members. The city hosts several major Korean and international military conferences.
Gyeryong city is one of the newest cities except for new cities near Seoul. The establishment as a city was made in 2003, when it broke from Nonsan.
According to data, Gyeryong city and surrounding area were called "Yeonsan-Gun" in 1896. After Japanese colonization, it was incorporated to Nonsan. Later Gyeryong was chosen as the site for military. In 1989, Military and army headquarters, Gyeryongdae, moved to Gyeryong City. In 1991, it was designated as special area by president. The congress voted and decided via a special legislative bill that Gyeryong city be established on June 30, 2003. Six months later, the city officially came out.
The area currently called Gyeryong city was known to be Shindoan among the older residents. Gyeryong is also known to be a satellite city of Daejeon due to its geographical closeness.