- Guardrails throughout the prefecture are unified in natsumikan (summer mandarin) yellow color.
- Fugu is called 'fuku' and associated with 'good fortune' as a lucky charm in Shimonoseki.
- The Kanmon Tunnel connecting Honshu and Kyushu has both rail and road sections on the Shimonoseki side.
- Tsunoshima Bridge is one of Japan's longest toll-free bridges to a remote island.
- Multiple free 24-hour foot baths are available at Yuda Onsen in Yamaguchi City.
- Akiyoshidai undergoes controlled burning every February, turning the entire plateau black in a spectacular sight.
- Kintaikyo Bridge's wooden components are partially replaced every 3 years and fully replaced every 20 years.
- Yamaguchi Ube Airport was Japan's first experimental airport for codeshare flights (ANA-JAL joint operation).
- The prefecture has two national treasure five-story pagodas; Rurikoji is a representative Muromachi-period structure.
- Since the Meiji era, Yamaguchi has produced 8 prime ministers, among the highest in Japan.
- Tawarayama Onsen in Nagato City is one of the few remaining hot spring areas with self-catering healing culture.
- Suooshima Island is nicknamed 'Setouchi Hawaii' and has a museum about Hawaiian immigration history.
- Mishima beef is a phantom wagyu with only a dozen head shipped annually, traded at premium prices.
- Omikuji (fortune papers) from Iwakuni City's Shuto-cho account for about 70% of national market share.
- The Kitaura region has thrived on whaling since the Edo period, with whale culture still alive today.