| Prefectural capital | Kenchoo Shozaichi | Yamaguchi-shi |
| Population [Ranking] | Jinkoo [Jun'i] | 1,342,059 nin [ 27 ] |
| Area (km2) [Ranking] | Menseki [Jun'i] | 6,112.89 km2 [ 23 ] |
| Population density (/km2) | Jinkoo Mitsudo | 220 nin |
| Climate : Summer (C) | Kikoo : Natsu | 31.5 / 21.9 do (Yamaguchi city) |
| Climate : Winter (C) | Kikoo : Fuyu | 9 / 0 do (Yamaguchi city) |
| Tourist spots | Kankoochi | Shimonoseki, Akiyoshidai |
| Local products | Tokusanhin | Fugu (blowfish), Kamaboko (boiled fish paste) |
| Prefectural bird | Ken no Tori | NabeZuru (hooded crane) |
| Prefectural flower | Ken no Hana | NatsuMikan no Hana (watson pomelo blossom) |
| Prefectural tree | Ken no Ki | AkaMatsu (red pine) |
| Tips | Hitokoto | Shimonoseki no Fugu wa yuumei, Akiyoshidai ni wa Nihon saidai no Shoonyuudoo ga aru |
