推荐回答（6个）
北京010、上海021、天津022、重庆023、广州020、成都028、武汉027、沈阳024、海口0898、深圳0755、杭州0571、苏州0512、温州0577、宁波0574、三亚0899、儋州0890.南京025、西安029、哈尔滨0451、佛山0757、大连0411、福州0591、泉州0595、郑州0371、洛阳0379、南阳0377、石家庄0311、济南市0531、青岛市0532
北京：010 上海：021 天津：022 重庆：023
广州：020 成都：028 武汉：027 沈阳：024
海口：0898 深圳：0755 杭州：0571 苏州：0512
温州：0577 宁波：0574 三亚：0899 儋州：0899
南京：025 西安：029 哈尔滨：0451佛山：0757
大连：0411 福州：0591 泉州：0595 郑州：0371
洛阳：0379 石家庄：0311济南：0531 青岛：0532
楼上已提供的完全正确，补儋州
儋州市位于海南岛西北部，濒临北部湾，面积三千三百四十三平方公里，人口九十万，是海南省人口最多，面积最大的市（县）。
以前儋州区号0890，从2002年开始，
海南省全省统一一个区号0898
010 、021、022、023、020、028、027、024、0898、0755、0571、0512、0577、0574、0898、0890、025、029、0451、0757、0411、0591、0595、0371、0379、0377、0311、0531、0532
北京010 上海021 天津022 重庆023 广州020 成都028 武汉027 沈阳024 海口0898 深圳0755 杭州0571 苏州0512 温州0577 宁波0574 三亚0899 儋州0890 南京025 西安029 哈尔滨0451 佛山0757 大连0411 福州0591 泉州0595 郑州0371 洛阳0379 南阳0377 石家庄0311 济南市0531 青岛市0532
http://www.ip138.com/post/ 这个网里什么地方的区号都可以查.
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