其实Zip（ZipCode）就是国际通用的一种邮政编码方式，因为中国的邮政编码是6位的，而国外的邮政编码也一般不是5位的，但是国际上大多会使用Zip编码方式，Zip编码方式是类似的，像美国的是由州的编码作为前2位字母，城市有一个3位数字的编码，这样两者组成了5位的Zip编码。中国的也是如此。
如Changchun,JL,431表示长春的Zip是JL431。其中JL表示长春所在省份吉林，431是长春在吉林省的编码（可能是和电话号码有关，我只看了这一条，长春的电话区号是0431）。
以上是我自己看了编码后总结的，有不对之处望网友们指出改正。
看到有的朋友没有找到自己的城市，我又查了一下（原来好难查呀，我找了很久），又补充了一些，希望能帮助更多的朋友。
以下是ChinaZip编码表：
Chinacitycodes:
Akesu,XJ997
Alashanzuoqi,NM483
Aletai,XJ906
Ankang,SN915
Anqing,AH556
Anshan,LN412
Anshun,GZ853
Anyang,HEN372
Atushi,XJ908
Baicheng,JL436
Baise,GX776
Baishan,JL439
Baiyin,GS943
Baoding,HEB312
Baoji,SN917
Baoshan,YN875
Baotou,NM472
Bazhong,SC827
Beihai,GX779
Beijing,BJ10
Bengbu,AH552
Benxi,LN414
Bijie,GZ857
Binzhou,SD543
Bole,XJ909
Cangzhou,HEB317
Changchun,JL431
Changde,HN736
Changdu,XZ895
Changji,XJ994
Changsha,HN731
Changzhi,SX355
Changzhou,JS519
Chaohu,AH565
Chaoyang,GD754
Chaoyang,LN421
Chaozhou,GD768
Chengde,HEB314
Chengdu,SC28
Chenzhou,HN735
Chifeng,NM476
Chizhou,AH566
Chongqing,CQ23
Chuxiong,YN878
Chuzhou,AH550
Dali,YN872
Dalian,LN411
Dandong,LN415
Daqing,HL459
Datong,SX352
Dazhou,SC818
Delingha,QH977
Deyang,SC838
Dezhou,SD534
Dingxi,GS932
Dongguan,GD769
Dongsheng,NM477
Dongying,SD546
Duyun,GZ854
Enshi,HB718
Ezhou,HB711
Fangchenggang,GX770
Foshan,GD757
Fushun,LN413
Fuxin,LN418
Fuyang,AH558
Fuzhou,FJ591
Fuzhou,JX794
Ganzhou,JX797
GeErmu,QH979
GeEr,XZ897
Gejiu,YN873
Gonghe,QH974
GuangAn,SC826
Guangyuan,SC839
Guangzhou,GD20
Guilin,GX773
Guiyang,GZ851
Guyuan,NX954
Haikou,HQ898
Hailaer,NM470
Haiyan,QH970
Hami,XJ902
Handan,HEB310
Hangzhou,ZJ571
Hanzhong,SN916
Harbin,HL451
Hebi,HEN392
Hechi,GX778
Hefei,AH551
Hegang,HL468
Heihe,HL456
Hengshui,HEB318
Hengyang,HN734
Hetian,XJ903
Heyuan,GD762
Heze,SD530
Hezuo,GS941
HuaiYin,JS517
Huaibei,AH561
Huaihua,HN745
Huainan,AH554
Huangchuan,HEN397
Huanggang,HB713
Huangshan,AH559
Huangshi,HB714
Huhehaote,NM471
Huizhou,GD752
Huludao,LN429
Hunchun,JL440
Huzhou,ZJ572
JiAn,JX796
Jiagedaqi,HL457
Jiamusi,HL454
Jiangmen,GD750
Jiaozuo,HEN391
Jiaxing,ZJ573
Jieyang,GD663
Jilin,JL432
Jinan,SD531
Jinchang,GS935
Jincheng,SX356
Jingdezhen,JX798
Jinghong,YN691
Jingmen,HB724
Jingzhou,HB716
Jinhua,ZJ579
Jining,NM474
Jining,SD537
Jinzhou,LN416
Jishou,HN743
Jiujiang,JX792
Jiuquan,GS937
Jixi,HL467
Kaifeng,HEN378
Kaili,GZ855
Kalamayi,XJ990
Kangding,SC836
Kashi,XJ998
KuErle,XJ996
Kuitun,XJ992
Kunming,YN871
Laiwu,SD634
Langfang,HEB316
Lanzhou,GS931
Leshan,SC833
Lhasa,XZ891
Lianyungang,JS518
Liaocheng,SD635
Liaoyang,LN419
Liaoyuan,JL437
Lijiang,YN888
Lincang,YN883
Linfen,SX357
Linhe,NM478
Linxia,GS930
Linyi,SD539
Linzhi,XZ894
Lishi,SX358
Lishui,ZJ578
LiuAn,AH564
Liuku,YN886
Liupanshui,GZ858
Liuzhou,GX772
Longyan,FJ597
Loudi,HN738
Luohe,HEN395
Luoyang,HEN379
Luxi,YN692
Luzhou,SC830
MaAnshan,AH555
MaErkang,SC837
Maoming,GD668
Maqin,QH,975
Meihekou,JL448
Meizhou,GD753
Mianyang,SC816
Mudanjiang,HL453
Naidong,XZ893
Nanchang,JX791
Nanchong,SC817
Nanjing,JS25
Nanning,GX771
Nanping,FJ599
Nantong,JS513
Nanyang,HEN377
Naqu,XZ896
Neijiang,SC832
Ningbo,ZJ574
Ningde,FJ593
Panjin,LN427
Panzhihua,SC812
PingAn,QH,972
Pingdingshan,HEN375
Pingliang,GS,933
Pingxiang,JX799
Putian,FJ594
Puyang,HEN393
Qingdao,SD532
Qingyuan,GD763
Qinhuangdao,HEB335
Qinzhou,GX777
Qiqihar,HL452
Qitaihe,HL464
Quanzhou,FJ595
Qujing,YN874
Quzhou,ZJ570
Rikaze,XZ892
Rizhao,SD633
Sanmenxia,HEN398
Sanming,FJ598
Shanghai,SH21
Shangqiu,HEN370
Shangrao,JX793
Shangzhou,SN914
Shantou,GD754
Shanwei,GD660
Shaoguan,GD751
Shaoxing,ZJ575
Shaoyang,HN739
Shenyang,LN24
Shenzhen,GD755
Shihezi,XJ993
Shijiazhuang,HEB311
Shiyan,HB719
Shizuishan,NX952
Shuangyashan,HL469
Shunde,GD765
Shuozhou,SX349
Simao,YN879
Siping,JL434
Songyuan,JL438
Suihua,HL455
Suining,SC825
Suizhou,HB722
Suqian,JS527
Suzhou,AH557
Suzhou,JS512
Tacheng,XJ901
TaiAn,SD538
Taiyuan,SX351
Taizhou,JS523
Taizhou,ZJ576
Tangshan,HEB315
Tianjin,TJ22
Tianshui,GS938
Tieling,LN410
Tongchuan,SN919
Tonghua,JL435
Tongliao,NM475
Tongling,AH562
Tongren,GZ856
Weifang,SD536
Weihai,SD631
Weinan,SN913
Wenshan,YN876
Wenzhou,ZJ577
Wuhai,NM473
Wuhan,HB27
Wuhu,AH553
Wulanhaote,NM482
Wuxi,JS510
Wuzhou,GX774
XiAn,SN29
Xiamen,FJ592
Xiangfan,HB710
Xiangtan,HN732
Xianning,HB715
Xiantao,HB728
Xianyang,SN910
Xiaogan,HB712
Xichang,SC834
Xilinhaote,NM479
Xingtai,HEB319
Xingyi,GZ859
Xinxiang,HEN373
Xinyang,HEN376
Xinyu,JX790
Xinzhou,SX350
Xuancheng,AH563
Xuchang,HEN374
Xuzhou,JS516
YaAn,SC835
YanAn,SN911
Yancheng,JS515
Yangjiang,GD662
Yangquan,SX353
Yangzhou,JS514
Yanji,JL433
Yantai,SD535
Yibin,SC831
Yichang,HB717
Yichun,HL458
Yichun,JX795
Yingkou,LN417
Yingtan,JX701
Yiyang,HN737
Yongzhou,HN746
Yuci,SX354
Yueyang,HN730
Yulin,GX775
Yulin,SN912
Yuncheng,SX359
Yunfu,GD766
Yuxi,YN877
Zaozhuang,SD632
Zhangjiajie,HN744
Zhangjiakou,HEB313
Zhangzhou,FJ596
Zhanjiang,GD759
Zhaoqing,GD758
Zhaotong,YN870
Zhengzhou,HEN371
Zhenjiang,JS511
Zhongdian,YN887
Zhongshan,GD760
Zhoukou,HEN394
Zhoushan,ZJ580
Zhuhai,GD756
Zhumadian,HEN396
Zhuzhou,HN733
Zibo,SD533
Zigong,SC813
Zunyi,GZ852