Koshimizu Cho Postal codes
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- Soei099-3451
- Hamakoshimizu099-3452
- Hokuto099-3453
- Yambetsu099-3454
- Koshimizu Cho099-3600
- Kayano099-3601
- Higashino099-3602
- Izumi099-3603
- Mizukami099-3604
- Mokotoyama099-3605
- Kamitoku099-3611
- Kyowa099-3612
- Kamiura099-3613
- Miwa099-3614
- Nakasato099-3615
- Asahi099-3616
- Motomachi099-3641
- Minamimachi099-3642
- 小清水町農業協同組合099-3697
- 小清水町役場099-3698
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