Cities near Kosai-shi
- Kosai (~1 km)
- Hamamatsu (~10 km)
- Toyohashi (~14 km)
- Toyokawa (~19 km)
- Shinshiro (~25 km)
- Iwata (~29 km)
- Gamagōri (~31 km)
- Tahara (~33 km)
- Okazaki (~36 km)
- Fukuroi (~36 km)
- Kota (~38 km)
- Nishio (~44 km)
- Kakegawa (~45 km)
- Shitara (~46 km)
- Anjō (~49 km)
- Kikugawa (~51 km)