- Kosai City Council | Kosai City Office, 3268 Yoshimi, Kosai City, Shizuoka Prefecture 431-0492 | Kosai City Office
- Roadside Station Shiomizaka, National Route 1 281.6KP | Roadside Station Shiomizaka, 1896-2 Shirasuka, Kosai City, Shizuoka Prefecture 431-0451 | Hamamatsu River National Highway Office
- Shiomi Tunnel East, National Route 1 282.3KP | Shirasuka, Kosai City, Shizuoka Prefecture 431-0451 | Hamamatsu River National Highway Office
- Shiomi Tunnel West, National Route 1 282.9KP | Shirasuka, Kosai City , Shizuoka Prefecture 431-0451 | Hamamatsu River National Highway Office
- Roadside Station Shiomizaka | Address: Roadside Station Shiomizaka, 1896-2 Shirasuka, Kosai City, Shizuoka Prefecture 431-0451 | Camera Title: Kosai City Tsunami Surveillance Camera | Management: Kosai City Office
- Arai Benten Kaikokan | Address: Arai Town, Kosai City | Camera Title: Kosai City Tsunami Surveillance Camera | Management: Kosai City Office
