Postal codes in Koga-shi, Ibaraki
茨城県古河市 — 88 postal codes. General code: 306-0000. Local government code 08204.
Address example
1-2-3 Asahicho, Koga-shi, Ibaraki 306-0012, Japan
〒306-0012 茨城県古河市旭町1-2-3
Replace 1-2-3 with the chome-ban-go (block and lot) number, and add the building and room number before it.
| Postal code | Town / English address |
|---|---|
| 306-0000 | (any other address in this municipality) （下に掲載がない場合） Koga-shi, Ibaraki 306-0000, Japan |
| 306-0012 | Asahicho 旭町 Asahicho, Koga-shi, Ibaraki 306-0012, Japan |
| 306-0044 | Arakuda 新久田 Arakuda, Koga-shi, Ibaraki 306-0044, Japan |
| 306-0224 | Isagoishinden 砂井新田 Isagoishinden, Koga-shi, Ibaraki 306-0224, Japan |
| 306-0225 | Isobe 磯部 Isobe, Koga-shi, Ibaraki 306-0225, Japan |
| 306-0202 | Inamiya 稲宮 Inamiya, Koga-shi, Ibaraki 306-0202, Japan |
| 306-0105 | Eguchi 江口 Eguchi, Koga-shi, Ibaraki 306-0105, Japan |
| 306-0236 | Otsutsumi 大堤 Otsutsumi, Koga-shi, Ibaraki 306-0236, Japan |
| 306-0032 | Otemachi 大手町 Otemachi, Koga-shi, Ibaraki 306-0032, Japan |
| 306-0052 | Oyama 大山 Oyama, Koga-shi, Ibaraki 306-0052, Japan |
| 306-0111 | Owada 大和田 Owada, Koga-shi, Ibaraki 306-0111, Japan |
| 306-0206 | Okazato 丘里 Okazato, Koga-shi, Ibaraki 306-0206, Japan |
| 306-0101 | Osaki 尾崎 Osaki, Koga-shi, Ibaraki 306-0101, Japan |
| 306-0226 | Onanuma 女沼 Onanuma, Koga-shi, Ibaraki 306-0226, Japan |
| 306-0104 | Onna 恩名 Onna, Koga-shi, Ibaraki 306-0104, Japan |
| 306-0211 | Kazuro 葛生 Kazuro, Koga-shi, Ibaraki 306-0211, Japan |
| 306-0223 | Kamiisagoi 上砂井 Kamiisagoi, Koga-shi, Ibaraki 306-0223, Japan |
| 306-0201 | Kamiono 上大野 Kamiono, Koga-shi, Ibaraki 306-0201, Japan |
| 306-0128 | Kamikatata 上片田 Kamikatata, Koga-shi, Ibaraki 306-0128, Japan |
| 306-0234 | Kamihemi 上辺見 Kamihemi, Koga-shi, Ibaraki 306-0234, Japan |
| 306-0122 | Kamiwada 上和田 Kamiwada, Koga-shi, Ibaraki 306-0122, Japan |
| 306-0213 | Kitatone 北利根 Kitatone, Koga-shi, Ibaraki 306-0213, Japan |
| 306-0005 | Kitamachi 北町 Kitamachi, Koga-shi, Ibaraki 306-0005, Japan |
| 306-0106 | Kitamanakabashi 北間中橋 Kitamanakabashi, Koga-shi, Ibaraki 306-0106, Japan |
| 306-0115 | Kitayamata 北山田 Kitayamata, Koga-shi, Ibaraki 306-0115, Japan |
| 306-0212 | Kuno 久能 Kuno, Koga-shi, Ibaraki 306-0212, Japan |
| 306-0055 | Keyakidaira けやき平 Keyakidaira, Koga-shi, Ibaraki 306-0055, Japan |
| 306-0041 | Konosu 鴻巣 Konosu, Koga-shi, Ibaraki 306-0041, Japan |
| 306-0214 | Koya 高野 Koya, Koga-shi, Ibaraki 306-0214, Japan |
| 306-0016 | Koga 古河 Koga, Koga-shi, Ibaraki 306-0016, Japan |
| 306-0231 | Kozutsumi 小堤 Kozutsumi, Koga-shi, Ibaraki 306-0231, Japan |
| 306-0123 | Gohei 五部 Gohei, Koga-shi, Ibaraki 306-0123, Japan |
| 306-0045 | Komagasaki 駒ケ崎 Komagasaki, Koga-shi, Ibaraki 306-0045, Japan |
| 306-0121 | Komagome 駒込 Komagome, Koga-shi, Ibaraki 306-0121, Japan |
| 306-0221 | Komahane 駒羽根 Komahane, Koga-shi, Ibaraki 306-0221, Japan |
| 306-0024 | Saiwaicho 幸町 Saiwaicho, Koga-shi, Ibaraki 306-0024, Japan |
| 306-0056 | Sakama 坂間 Sakama, Koga-shi, Ibaraki 306-0056, Japan |
| 306-0036 | Sakuramachi 桜町 Sakuramachi, Koga-shi, Ibaraki 306-0036, Japan |
| 306-0042 | Sanwa 三和 Sanwa, Koga-shi, Ibaraki 306-0042, Japan |
| 306-0001 | Shizukamachi 静町 Shizukamachi, Koga-shi, Ibaraki 306-0001, Japan |
| 306-0204 | Shimoono 下大野 Shimoono, Koga-shi, Ibaraki 306-0204, Japan |
| 306-0127 | Shimokatata 下片田 Shimokatata, Koga-shi, Ibaraki 306-0127, Japan |
| 306-0235 | Shimohemi 下辺見 Shimohemi, Koga-shi, Ibaraki 306-0235, Japan |
| 306-0014 | Shimoyamacho 下山町 Shimoyamacho, Koga-shi, Ibaraki 306-0014, Japan |
| 306-0222 | Shaka 釈迦 Shaka, Koga-shi, Ibaraki 306-0222, Japan |
| 306-0116 | Shinwada 新和田 Shinwada, Koga-shi, Ibaraki 306-0116, Japan |
| 306-0205 | Sekido 関戸 Sekido, Koga-shi, Ibaraki 306-0205, Japan |
| 306-0047 | Tatsuzaki 立崎 Tatsuzaki, Koga-shi, Ibaraki 306-0047, Japan |
| 306-0051 | Chayashinden 茶屋新田 Chayashinden, Koga-shi, Ibaraki 306-0051, Japan |
| 306-0033 | Chuocho 中央町 Chuocho, Koga-shi, Ibaraki 306-0033, Japan |
| 306-0103 | Chozaemonshinden 長左エ門新田 Chozaemonshinden, Koga-shi, Ibaraki 306-0103, Japan |
| 306-0007 | Tokiwacho 常盤町 Tokiwacho, Koga-shi, Ibaraki 306-0007, Japan |
| 306-0043 | Torihami 鳥喰 Torihami, Koga-shi, Ibaraki 306-0043, Japan |
| 306-0053 | Nakada 中田 Nakada, Koga-shi, Ibaraki 306-0053, Japan |
| 306-0054 | Nakadashinden 中田新田 Nakadashinden, Koga-shi, Ibaraki 306-0054, Japan |
| 306-0110 | Nasaki 名崎 Nasaki, Koga-shi, Ibaraki 306-0110, Japan |
| 306-0233 | Nishiushigaya 西牛谷 Nishiushigaya, Koga-shi, Ibaraki 306-0233, Japan |
| 306-0037 | Nishikicho 錦町 Nishikicho, Koga-shi, Ibaraki 306-0037, Japan |
| 306-0038 | Nishimachi 西町 Nishimachi, Koga-shi, Ibaraki 306-0038, Japan |
| 306-0109 | Nishimanakabashi 西間中橋 Nishimanakabashi, Koga-shi, Ibaraki 306-0109, Japan |
| 306-0125 | Nirei 仁連 Nirei, Koga-shi, Ibaraki 306-0125, Japan |
| 306-0035 | Hase 長谷 Hase, Koga-shi, Ibaraki 306-0035, Japan |
| 306-0034 | Hasemachi 長谷町 Hasemachi, Koga-shi, Ibaraki 306-0034, Japan |
| 306-0026 | Hara 原 Hara, Koga-shi, Ibaraki 306-0026, Japan |
| 306-0025 | Haramachi 原町 Haramachi, Koga-shi, Ibaraki 306-0025, Japan |
| 306-0011 | Higashi 東 Higashi, Koga-shi, Ibaraki 306-0011, Japan |
| 306-0232 | Higashiushigaya 東牛谷 Higashiushigaya, Koga-shi, Ibaraki 306-0232, Japan |
| 306-0013 | Higashihoncho 東本町 Higashihoncho, Koga-shi, Ibaraki 306-0013, Japan |
| 306-0107 | Higashimanakabashi 東間中橋 Higashimanakabashi, Koga-shi, Ibaraki 306-0107, Japan |
| 306-0124 | Higashimorokawa 東諸川 Higashimorokawa, Koga-shi, Ibaraki 306-0124, Japan |
| 306-0112 | Higashiyamata 東山田 Higashiyamata, Koga-shi, Ibaraki 306-0112, Japan |
| 306-0006 | Heiwamachi 平和町 Heiwamachi, Koga-shi, Ibaraki 306-0006, Japan |
| 306-0023 | Honcho 本町 Honcho, Koga-shi, Ibaraki 306-0023, Japan |
| 306-0216 | Maebayashi 前林 Maebayashi, Koga-shi, Ibaraki 306-0216, Japan |
| 306-0046 | Makinoji 牧野地 Makinoji, Koga-shi, Ibaraki 306-0046, Japan |
| 306-0021 | Matsunami 松並 Matsunami, Koga-shi, Ibaraki 306-0021, Japan |
| 306-0215 | Mizumi 水海 Mizumi, Koga-shi, Ibaraki 306-0215, Japan |
| 306-0002 | Misugicho 三杉町 Misugicho, Koga-shi, Ibaraki 306-0002, Japan |
| 306-0003 | Midoricho 緑町 Midoricho, Koga-shi, Ibaraki 306-0003, Japan |
| 306-0015 | Minamicho 南町 Minamicho, Koga-shi, Ibaraki 306-0015, Japan |
| 306-0108 | Minamimanakabashi 南間中橋 Minamimanakabashi, Koga-shi, Ibaraki 306-0108, Japan |
| 306-0031 | Miyamaecho 宮前町 Miyamaecho, Koga-shi, Ibaraki 306-0031, Japan |
| 306-0126 | Morokawa 諸川 Morokawa, Koga-shi, Ibaraki 306-0126, Japan |
| 306-0113 | Yagai 谷貝 Yagai, Koga-shi, Ibaraki 306-0113, Japan |
| 306-0203 | Yagihashi 柳橋 Yagihashi, Koga-shi, Ibaraki 306-0203, Japan |
| 306-0114 | Yamata 山田 Yamata, Koga-shi, Ibaraki 306-0114, Japan |
| 306-0022 | Yokoyamacho 横山町 Yokoyamacho, Koga-shi, Ibaraki 306-0022, Japan |
| 306-0004 | Raidencho 雷電町 Raidencho, Koga-shi, Ibaraki 306-0004, Japan |
Source: Japan Post postal code data (UTF-8 edition, updated Aug 31, 2026) and romanized edition (KEN_ALL_ROME, June 2025). Japan Post does not claim copyright on postal code data and allows free redistribution. Romaji follows Japan Post (long vowels are not marked). * = romanized by this site from the kana reading because the town is not yet in the romanized edition.