A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 268800, OKLAHOMA CITY, OK 73126-8800
PO BOX 268801, OKLAHOMA CITY, OK 73126-8801
PO BOX 268802, OKLAHOMA CITY, OK 73126-8802
PO BOX 268803, OKLAHOMA CITY, OK 73126-8803
PO BOX 268804, OKLAHOMA CITY, OK 73126-8804
PO BOX 268805, OKLAHOMA CITY, OK 73126-8805
PO BOX 268806, OKLAHOMA CITY, OK 73126-8806
PO BOX 268807, OKLAHOMA CITY, OK 73126-8807
PO BOX 268808, OKLAHOMA CITY, OK 73126-8808
PO BOX 268809, OKLAHOMA CITY, OK 73126-8809
PO BOX 268810, OKLAHOMA CITY, OK 73126-8810
PO BOX 268811, OKLAHOMA CITY, OK 73126-8811
PO BOX 268812, OKLAHOMA CITY, OK 73126-8812
PO BOX 268813, OKLAHOMA CITY, OK 73126-8813
PO BOX 268814, OKLAHOMA CITY, OK 73126-8814
PO BOX 268815, OKLAHOMA CITY, OK 73126-8815
PO BOX 268816, OKLAHOMA CITY, OK 73126-8816
PO BOX 268817, OKLAHOMA CITY, OK 73126-8817
PO BOX 268818, OKLAHOMA CITY, OK 73126-8818
PO BOX 268819, OKLAHOMA CITY, OK 73126-8819
PO BOX 268820, OKLAHOMA CITY, OK 73126-8820
PO BOX 268821, OKLAHOMA CITY, OK 73126-8821
PO BOX 268822, OKLAHOMA CITY, OK 73126-8822
PO BOX 268823, OKLAHOMA CITY, OK 73126-8823
PO BOX 268824, OKLAHOMA CITY, OK 73126-8824
PO BOX 268825, OKLAHOMA CITY, OK 73126-8825
PO BOX 268826, OKLAHOMA CITY, OK 73126-8826
PO BOX 268827, OKLAHOMA CITY, OK 73126-8827
PO BOX 268828, OKLAHOMA CITY, OK 73126-8828
PO BOX 268829, OKLAHOMA CITY, OK 73126-8829
PO BOX 268830, OKLAHOMA CITY, OK 73126-8830
PO BOX 268831, OKLAHOMA CITY, OK 73126-8831
PO BOX 268832, OKLAHOMA CITY, OK 73126-8832
PO BOX 268833, OKLAHOMA CITY, OK 73126-8833
PO BOX 268834, OKLAHOMA CITY, OK 73126-8834
PO BOX 268835, OKLAHOMA CITY, OK 73126-8835
PO BOX 268836, OKLAHOMA CITY, OK 73126-8836
PO BOX 268837, OKLAHOMA CITY, OK 73126-8837
PO BOX 268838, OKLAHOMA CITY, OK 73126-8838
PO BOX 268839, OKLAHOMA CITY, OK 73126-8839
PO BOX 268840, OKLAHOMA CITY, OK 73126-8840
PO BOX 268841, OKLAHOMA CITY, OK 73126-8841
PO BOX 268842, OKLAHOMA CITY, OK 73126-8842
PO BOX 268843, OKLAHOMA CITY, OK 73126-8843
PO BOX 268844, OKLAHOMA CITY, OK 73126-8844
PO BOX 268845, OKLAHOMA CITY, OK 73126-8845
PO BOX 268846, OKLAHOMA CITY, OK 73126-8846
PO BOX 268847, OKLAHOMA CITY, OK 73126-8847
PO BOX 268848, OKLAHOMA CITY, OK 73126-8848
PO BOX 268849, OKLAHOMA CITY, OK 73126-8849
PO BOX 268850, OKLAHOMA CITY, OK 73126-8850
PO BOX 268851, OKLAHOMA CITY, OK 73126-8851
PO BOX 268852, OKLAHOMA CITY, OK 73126-8852
PO BOX 268853, OKLAHOMA CITY, OK 73126-8853
PO BOX 268854, OKLAHOMA CITY, OK 73126-8854
PO BOX 268855, OKLAHOMA CITY, OK 73126-8855
PO BOX 268856, OKLAHOMA CITY, OK 73126-8856
PO BOX 268857, OKLAHOMA CITY, OK 73126-8857
PO BOX 268858, OKLAHOMA CITY, OK 73126-8858
PO BOX 268859, OKLAHOMA CITY, OK 73126-8859
PO BOX 268860, OKLAHOMA CITY, OK 73126-8860
PO BOX 268861, OKLAHOMA CITY, OK 73126-8861
PO BOX 268862, OKLAHOMA CITY, OK 73126-8862
PO BOX 268863, OKLAHOMA CITY, OK 73126-8863
PO BOX 268864, OKLAHOMA CITY, OK 73126-8864
PO BOX 268865, OKLAHOMA CITY, OK 73126-8865
PO BOX 268866, OKLAHOMA CITY, OK 73126-8866
PO BOX 268867, OKLAHOMA CITY, OK 73126-8867
PO BOX 268868, OKLAHOMA CITY, OK 73126-8868
PO BOX 268869, OKLAHOMA CITY, OK 73126-8869
PO BOX 268870, OKLAHOMA CITY, OK 73126-8870
PO BOX 268871, OKLAHOMA CITY, OK 73126-8871
PO BOX 268872, OKLAHOMA CITY, OK 73126-8872
PO BOX 268873, OKLAHOMA CITY, OK 73126-8873
PO BOX 268874, OKLAHOMA CITY, OK 73126-8874
PO BOX 268875, OKLAHOMA CITY, OK 73126-8875
PO BOX 268876, OKLAHOMA CITY, OK 73126-8876
PO BOX 268877, OKLAHOMA CITY, OK 73126-8877
PO BOX 268878, OKLAHOMA CITY, OK 73126-8878
PO BOX 268879, OKLAHOMA CITY, OK 73126-8879
PO BOX 268880, OKLAHOMA CITY, OK 73126-8880
PO BOX 268881, OKLAHOMA CITY, OK 73126-8881
PO BOX 268882, OKLAHOMA CITY, OK 73126-8882
PO BOX 268883, OKLAHOMA CITY, OK 73126-8883
PO BOX 268884, OKLAHOMA CITY, OK 73126-8884
PO BOX 268885, OKLAHOMA CITY, OK 73126-8885
PO BOX 268886, OKLAHOMA CITY, OK 73126-8886
PO BOX 268887, OKLAHOMA CITY, OK 73126-8887
PO BOX 268888, OKLAHOMA CITY, OK 73126-8888
PO BOX 268889, OKLAHOMA CITY, OK 73126-8889
PO BOX 268890, OKLAHOMA CITY, OK 73126-8890
PO BOX 268891, OKLAHOMA CITY, OK 73126-8891
PO BOX 268892, OKLAHOMA CITY, OK 73126-8892
PO BOX 268893, OKLAHOMA CITY, OK 73126-8893
PO BOX 268894, OKLAHOMA CITY, OK 73126-8894
PO BOX 268895, OKLAHOMA CITY, OK 73126-8895
PO BOX 268896, OKLAHOMA CITY, OK 73126-8896
PO BOX 268897, OKLAHOMA CITY, OK 73126-8897
PO BOX 268898, OKLAHOMA CITY, OK 73126-8898
PO BOX 268899, OKLAHOMA CITY, OK 73126-8899
PO BOX 268900, OKLAHOMA CITY, OK 73126-8900
PO BOX 268901, OKLAHOMA CITY, OK 73126-8901
PO BOX 268902, OKLAHOMA CITY, OK 73126-8902
PO BOX 268903, OKLAHOMA CITY, OK 73126-8903
PO BOX 268904, OKLAHOMA CITY, OK 73126-8904
PO BOX 268905, OKLAHOMA CITY, OK 73126-8905
PO BOX 268906, OKLAHOMA CITY, OK 73126-8906
PO BOX 268907, OKLAHOMA CITY, OK 73126-8907
PO BOX 268908, OKLAHOMA CITY, OK 73126-8908
PO BOX 268909, OKLAHOMA CITY, OK 73126-8909
PO BOX 268910, OKLAHOMA CITY, OK 73126-8910
PO BOX 268911, OKLAHOMA CITY, OK 73126-8911
PO BOX 268912, OKLAHOMA CITY, OK 73126-8912
PO BOX 268913, OKLAHOMA CITY, OK 73126-8913
PO BOX 268914, OKLAHOMA CITY, OK 73126-8914
PO BOX 268915, OKLAHOMA CITY, OK 73126-8915
PO BOX 268916, OKLAHOMA CITY, OK 73126-8916
PO BOX 268917, OKLAHOMA CITY, OK 73126-8917
PO BOX 268918, OKLAHOMA CITY, OK 73126-8918
PO BOX 268919, OKLAHOMA CITY, OK 73126-8919
PO BOX 268920, OKLAHOMA CITY, OK 73126-8920
PO BOX 268921, OKLAHOMA CITY, OK 73126-8921
PO BOX 268922, OKLAHOMA CITY, OK 73126-8922
PO BOX 268923, OKLAHOMA CITY, OK 73126-8923
PO BOX 268924, OKLAHOMA CITY, OK 73126-8924
PO BOX 268925, OKLAHOMA CITY, OK 73126-8925
PO BOX 268926, OKLAHOMA CITY, OK 73126-8926
PO BOX 268927, OKLAHOMA CITY, OK 73126-8927
PO BOX 268928, OKLAHOMA CITY, OK 73126-8928
PO BOX 268929, OKLAHOMA CITY, OK 73126-8929
PO BOX 268930, OKLAHOMA CITY, OK 73126-8930
PO BOX 268931, OKLAHOMA CITY, OK 73126-8931
PO BOX 268932, OKLAHOMA CITY, OK 73126-8932
PO BOX 268933, OKLAHOMA CITY, OK 73126-8933
PO BOX 268934, OKLAHOMA CITY, OK 73126-8934
PO BOX 268935, OKLAHOMA CITY, OK 73126-8935
PO BOX 268936, OKLAHOMA CITY, OK 73126-8936
PO BOX 268937, OKLAHOMA CITY, OK 73126-8937
PO BOX 268938, OKLAHOMA CITY, OK 73126-8938
PO BOX 268939, OKLAHOMA CITY, OK 73126-8939
PO BOX 268940, OKLAHOMA CITY, OK 73126-8940
PO BOX 268941, OKLAHOMA CITY, OK 73126-8941
PO BOX 268942, OKLAHOMA CITY, OK 73126-8942
PO BOX 268943, OKLAHOMA CITY, OK 73126-8943
PO BOX 268944, OKLAHOMA CITY, OK 73126-8944
PO BOX 268945, OKLAHOMA CITY, OK 73126-8945
PO BOX 268946, OKLAHOMA CITY, OK 73126-8946
PO BOX 268947, OKLAHOMA CITY, OK 73126-8947
PO BOX 268948, OKLAHOMA CITY, OK 73126-8948
PO BOX 268949, OKLAHOMA CITY, OK 73126-8949
PO BOX 268950, OKLAHOMA CITY, OK 73126-8950
PO BOX 268951, OKLAHOMA CITY, OK 73126-8951
PO BOX 268952, OKLAHOMA CITY, OK 73126-8952
PO BOX 268953, OKLAHOMA CITY, OK 73126-8953
PO BOX 268954, OKLAHOMA CITY, OK 73126-8954
PO BOX 268955, OKLAHOMA CITY, OK 73126-8955
PO BOX 268956, OKLAHOMA CITY, OK 73126-8956
PO BOX 268957, OKLAHOMA CITY, OK 73126-8957
PO BOX 268958, OKLAHOMA CITY, OK 73126-8958
PO BOX 268959, OKLAHOMA CITY, OK 73126-8959
PO BOX 268960, OKLAHOMA CITY, OK 73126-8960
PO BOX 268961, OKLAHOMA CITY, OK 73126-8961
PO BOX 268962, OKLAHOMA CITY, OK 73126-8962
PO BOX 268963, OKLAHOMA CITY, OK 73126-8963
PO BOX 268964, OKLAHOMA CITY, OK 73126-8964
PO BOX 268965, OKLAHOMA CITY, OK 73126-8965
PO BOX 268966, OKLAHOMA CITY, OK 73126-8966
PO BOX 268967, OKLAHOMA CITY, OK 73126-8967
PO BOX 268968, OKLAHOMA CITY, OK 73126-8968
PO BOX 268969, OKLAHOMA CITY, OK 73126-8969
PO BOX 268970, OKLAHOMA CITY, OK 73126-8970
PO BOX 268971, OKLAHOMA CITY, OK 73126-8971
PO BOX 268972, OKLAHOMA CITY, OK 73126-8972
PO BOX 268973, OKLAHOMA CITY, OK 73126-8973
PO BOX 268974, OKLAHOMA CITY, OK 73126-8974
PO BOX 268975, OKLAHOMA CITY, OK 73126-8975
PO BOX 268976, OKLAHOMA CITY, OK 73126-8976
PO BOX 268977, OKLAHOMA CITY, OK 73126-8977
PO BOX 268978, OKLAHOMA CITY, OK 73126-8978
PO BOX 268979, OKLAHOMA CITY, OK 73126-8979
PO BOX 268980, OKLAHOMA CITY, OK 73126-8980
PO BOX 268981, OKLAHOMA CITY, OK 73126-8981
PO BOX 268982, OKLAHOMA CITY, OK 73126-8982
PO BOX 268983, OKLAHOMA CITY, OK 73126-8983
PO BOX 268984, OKLAHOMA CITY, OK 73126-8984
PO BOX 268985, OKLAHOMA CITY, OK 73126-8985
PO BOX 268986, OKLAHOMA CITY, OK 73126-8986
PO BOX 268987, OKLAHOMA CITY, OK 73126-8987
PO BOX 268988, OKLAHOMA CITY, OK 73126-8988
PO BOX 268989, OKLAHOMA CITY, OK 73126-8989
PO BOX 268990, OKLAHOMA CITY, OK 73126-8990
PO BOX 268991, OKLAHOMA CITY, OK 73126-8991
PO BOX 268992, OKLAHOMA CITY, OK 73126-8992
PO BOX 268993, OKLAHOMA CITY, OK 73126-8993
PO BOX 268994, OKLAHOMA CITY, OK 73126-8994
PO BOX 268995, OKLAHOMA CITY, OK 73126-8995
PO BOX 268996, OKLAHOMA CITY, OK 73126-8996
PO BOX 268997, OKLAHOMA CITY, OK 73126-8997
PO BOX 268998, OKLAHOMA CITY, OK 73126-8998
PO BOX 268999, OKLAHOMA CITY, OK 73126-8999
PO BOX 269000, OKLAHOMA CITY, OK 73126-9000
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