| Country: | KOR |
| Type: | NR |
| Route: | 40 |
| Alternate Name: | 국도 제40호선 |
| Length Km: | 145.6 |
| Length Round: | 1 |
| Established: | 14 March 1981 |
| Direction A: | West |
| Terminus A: | Dangjin, South Chungcheong Province |
| Direction B: | East |
| Terminus B: | Gongju, South Chungcheong Province |
National Route 40 is a national highway in South Korea connects Dangjin to Gongju. It established on 14 March 1981[1]
Dangjin- Yesan County- Hongseong County- Boryeong- Buyeo County- Gongju
IC: Interchange
| Name[2] | Hangul name | Connections | Location | Note | |
|---|---|---|---|---|---|
| Directly connected with Prefectural Route 622 | |||||
| (Under Unsan 1 bridge) | (운산1교 하부) | National Route 32 Prefectural Route 622 | Dangjin | Hapdeok-eup | Terminus |
| Jaeoh Ridge entrance | |||||
| Godeok IC | 고덕 나들목 | Dangjin-Yeongdeok Expressway | Yesan County | Godeok-myeon | |
| Daecheon Intersection | 대천 교차로 | Prefectural Route 619 | |||
| Daeji Intersection | 대지사거리 | Prefectural Route 618 Prefectural Route 619 | |||
| Godeok Middle School | 고덕중학교 | ||||
| Daeji Intersection | 대지삼거리 | Godeokjungang-ro | Bongsan-myeon | ||
| Hapyeong Intersection | 하평삼거리 | Bongsan-ro | |||
| No name | (이름 없음) | Yedeok-ro | |||
| Eubnae Intersection | 읍내 교차로 | Prefectural Route 609 (Deoksanoncheon-ro) Bonggun-ro Chungui-ro | |||
| Songshan Intersection | 송산 교차로 | National Route 45 Prefectural Route 70 (Yun Bong-gil) Prefectural Route 609 (Docheong-daero) | Sapgyo-eup | ||
| Sinri Bridge | 신리대교 | ||||
| Deoksan Hot Spring Intersection | 덕산온천 교차로 | Deoksan Hot Spring | Deoksan-myeon | ||
| Sudeoksa Intersection | 수덕사 교차로 | National Route 45 Prefectural Route 70 (Yun Bong-gil) Sudeoksa-ro | |||
| Sudeoksa Entrance | 수덕사입구 | ||||
| Oera Intersection | 외나사거리 | Hongdeokseo-ro | |||
| Sudeok Elementary School | 수덕초등학교 | ||||
| Guseong Bridge | 구성교 | ||||
| Gagok Elementary School (closed) | 가곡초등학교(폐교) | Hongseong | Galsan-myeon | ||
| Hongseong IC | 홍성 나들목 | Seohaean Expressway National Route 29 Galsan-ro | |||
| Sangchon Intersection | 상촌교차로 | National Route 29 Sangchon-ro Walyong-ro | |||
| Galsan Intersection | 갈산교차로 | Baekya-ro | |||
| Galsan tunnel | 갈산터널 | 390m long | |||
| Odu Intersection | 오두교차로 | Galsanseo-gil | |||
| Gwangri Intersection | 광리교차로 | Prefectural Route 96 (Cheonsuman-ro) Seobuseo road | Seobu-myeon | ||
| Miho Intersection | 이호삼거리 | Walyong-ro Yihogil | |||
| Hongseong West Middle School | 홍성서부중학교 | ||||
| No name | (이름 없음) | Hongnamseo-ro 285 beon-gil | |||
| Gongchon Intersection | 송촌삼거리 | Prefectural Route 96 (Hongnamseo-ro) | |||
| No name | (이름 없음) | Seobu-ro 43 beon-gil | |||
| Eosa Intersection | 어사교차로 | Namdanghang-ro | |||
| Eosa-ri bus stop | 어사리정류소 | ||||
| Naedongma Village Entrance | 내동마을입구 | Namdanghang-ro 264 beon-gil | |||
| Namdang Port | 남당항 | ||||
| Anheungdong Intersection | 안흥동삼거리 | Hongbo-ro | |||
| Hongseong seawall Intersection | 홍성방조제삼거리 | Imhae-ro | |||
| Hongseong Bridge | 홍성교 | ||||
| Hongseong seawall | 홍성방조제 | Boryeong | Cheonbuk-myeon | ||
| Cheonbuk Intersection | 천북삼거리 | Hagung road | |||
| Haman Intersection | 하만삼거리 | Prefectural Route 622 (Cheongwang-ro) | |||
| Boryeong Bridge Boryeong seawall | 보령교 보령방조제 | ||||
| Soseong Intersection | 소성삼거리 | Prefectural Route 610 (Chungcheonsuyeong-ro) | Ocheon-myeon | ||
| Sinchon Intersection | 신촌삼거리 | Prefectural Route 610 (Domihang-ro) | |||
| Galhyeon Entrance | 갈현입구 | Dolgogae-gil | Cheongso-myeon | ||
| Magang 2 | 마강2리앞 | Oncheonjungang-ro | Jupo-myeon | ||
| Oncheonwaseon Bridge | 오천과선교 | ||||
| Jupo Intersection | 주포사거리 | National Route 21 (Chungseo-ro) Bỏyeongeupseong-gil | |||
| Bongdang Intersection | 봉당삼거리 | ||||
| Gwangsan Intersection | 관산사거리 | Yupoyeok-gil | |||
| Chungseo-ro Intersection | 충서로사거리 | ||||
| Jugyo Intersection | 주교사거리 | Prefectural Route 610 (Ulgyekeun-gil) | |||
| Gwanchang Intersection | 관창교차로 | Boryeongbuk-ro | Jugyo-myeon | ||
| Bonghwang tunnel | 봉황터널 | Daecheon-dong | |||
| Hwasan Intersection | 화산교차로 | National Route 36 National Route 77 (Daecheong-ro) | |||
| Yeongcheon Intersection | 명천교차로 | National Route 21 National Route 77 (Chungseo-ro) | |||
| Seongju tunnel | 성주터널 | 720m long | |||
| Seongju Intersection | 성주삼거리 | Simwongyegong-ro | Seongju-myeon | ||
| Boryeong Coal Museum | 보령석탄박물관 | ||||
| Gawha Arts Park | 개화예술공원 | ||||
| Chungcheongnamgaehwa Elementary School | 충남개화초등학교 | ||||
| Gaewa Intersection | 개화삼거리 | Prefectural Route 606 (Mansu-ro) | |||
| Dowhadam Elementary School (closed) | 도화담초등학교(폐교) | Misan-myeon | |||
| Dohwadam Intersection | 도화담삼거리 | Prefectural Route 617 | |||
| Sulibawi Intersection | 수리바위삼거리 | Oesan-ro | Buyeo County | Oesan-myeon | |
| Oesan Intersection | 외산사거리 | Prefectural Route 606 (Mansu-ro) | |||
| Jiti Intersection | 지티교앞 | Prefectural Route 613 (Sabi-ro) | Naesan-myeon | ||
| Minam Intersection | 미암교차로 | Seongchung-ro | |||
| Juam Intersection | 주암 교차로 | Sukdong-ro | |||
| Unchi Intersection | 운치교차로 | Seongchung-ro jilmajae-gil | |||
| Julam Intersection | 율암 교차로 | Seongchung-ro | |||
| Yulam Bridge | 율암교 | ||||
| Yonggang Middle School | 용강중학교 | Guryong-myeon | |||
| Gulyong Intersection | 구룡삼거리 | Heungsu-ro | |||
| Sujeong Intersection | 주정삼거리 | National Route 4 Prefectural Route 723 (Daebaekje-ro) | |||
| Meoggogae Intersection | 먹고개삼거리 | Prefectural Route 723 (Chungui-ro) | |||
| Gubong Intersection | 구봉교차로 | National Route 4 (Daebaekje-ro) Heungsu-ro | |||
| Hapsong Intersection | 합송교차로 | Hapsongseo-ro | Gyuam-myeon | ||
| Naeli Intersection | 내리 교차로 | National Route 29 National Route 39 (Gyuamuhoedo-ro) | |||
| Gyuam Intersection | 규암 교차로 | Prefectural Route 625 (Chungjeol-ro) | |||
| Buyeodae Bridge | 부여대교 | ||||
| Buyeo-eup | |||||
| Buyeo Intersection | 부여 교차로 | Seongwang-ro | |||
| Daewang Intersection | 대왕 교차로 | Geumseong-ro | |||
| Gatap Intersection | 가탑 교차로 | National Route 4 (Daebaejek-ro) | |||
| Dongmun Intersection | 동문삼거리 | Gatap-ro | |||
| Roundabout | 대향로로터리 | Bukpo-ro Seongwang-ro | |||
| Yongjeong Intersection | 용정교차로 | Samchung-ro | |||
| Jeongdong Intersection | 정동교차로 | Prefectural Route 625 (Baekjemun-ro) | |||
| Jawang Intersection | 자왕교차로 | Samchung-ro | |||
| Sinjeong Intersection | 신정교차로 | Bukpo-ro | |||
| Wangjin Intersection | 왕진교차로 | Prefectural Route 645 (Wangjin-ro) | |||
| Joseok Intersection | 저석교차로 | Prefectural Route 651 (Baekjekeung-gil) | |||
| Ochon Intersection | 오촌교차로 | Prefectural Route 651 (Baekjekeung-gil) | |||
| Bundang Intersection | 분강교차로 | Changam-gil | Gongju | Tancheon-myeon | |
| Seongli Intersection | 성리교차로 | Prefectural Route 645 (Deungsan-ro) | |||
| No name | (이름 없음) | Prefectural Route 799 (Geumbaek-ro) | One way | ||
| Samgak Intersection | 삼각교차로 | Prefectural Route 799 (Geumbaek-ro) | |||
| Dalsan Intersection | 달산교차로 | Prefectural Route 96 (Geumbawi-ro) | Iin-myeon | ||
| Iin Intersection | 이인교차로 | Prefectural Route 697 (Geumgang-ro) | |||
| Jubong Intersection | 주봉교차로 | Geombawi-ro | |||
| Taebong Intersection | 태봉교차로 | Ugeumti-ro | Geumhak-dong | ||
| Bongjeong Intersection | 봉정교차로 | Ugeumti-ro | |||
| Namgyeongju IC | 남공주 나들목 | Nonsan–Cheonan Expressway | |||
| Geomsang Intersection | 검상교차로 | Geomsangan-gil | |||
| Saejae Intersection | 새재교차로 | ||||
| Intersection (front of the police station) | 경찰서앞교차로 | Muryeong-ro | Ungjin-dong | ||
| Gongju Art & Culture Center | 공주문예회관 | Gomanalu-gil | |||
| Gongju Middle School Gongju Office of Education Tomb | 공주중학교 공주교육지원청 왕릉교 | ||||
| Gongsanseong Roundabout | 공산성 회전교차로 | Ungjin-ro | |||
| Gongsanseong Fortress | 공산성 | ||||
| Geumgang Bridge | 금강교 | ||||
| National Route 32 Prefectural Route 96 (Geumbyeok-ro) Uidang-ro | |||||
| Jeonmak Intersection | 전막 교차로 | Singwan-dong | Terminus | ||