In South Korea, highways that are managed by the provincial governments are called Local highways (Hangul: 지방도; Hanja: 地方道; RR: Jibangdo). Usually route numbers have 2~4 digits; the first digit stands for the main province of its manager.
State-funded local highways: 2 dights
Gyeonggi Province: 300s
Gangwon Province: 400s
North Chungcheong Province: 500s
South Chungcheong Province: 600s
North Jeolla Province: 700s
South Jeolla Province: 800s
North Gyeongsang Province: 900s
South Gyeongsang Province: 1000s
Jeju Special Self-governing Province: 1100s
Local highways of South Korea Wikipedia
There are some 2-digits local highways, called State-funded local highways (Hangul: 국지도; Hanja: 國地道; RR: Gukjido; short term of Hangul: 국가지원지방도; Hanja: 國家支援地方道; RR: Gukga Jiwon Jibangdo). These highways are basically managed by province level, but its routes are designated and controlled by the South Korean government. Also, most of 2-digits Local highways stand for planned extension route of the same-number national highways or candidates for upgrading to national routes.
These are the list of the routes. For the state-funded local highway, See #State-funded local highways.
Local highways of Gyeonggi Province were changed a lot in 1996 and 2005.■(#CCDDCC) is origin or terminus not in Gyeonggi Province.