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 780791, PHILADELPHIA, PA 19178-0791
PO BOX 780792, PHILADELPHIA, PA 19178-0792
PO BOX 780793, PHILADELPHIA, PA 19178-0793
PO BOX 780794, PHILADELPHIA, PA 19178-0794
PO BOX 780795, PHILADELPHIA, PA 19178-0795
PO BOX 780796, PHILADELPHIA, PA 19178-0796
PO BOX 780797, PHILADELPHIA, PA 19178-0797
PO BOX 780798, PHILADELPHIA, PA 19178-0798
PO BOX 780799, PHILADELPHIA, PA 19178-0799
PO BOX 780800, PHILADELPHIA, PA 19178-0800
PO BOX 780801, PHILADELPHIA, PA 19178-0801
PO BOX 780802, PHILADELPHIA, PA 19178-0802
PO BOX 780803, PHILADELPHIA, PA 19178-0803
PO BOX 780804, PHILADELPHIA, PA 19178-0804
PO BOX 780805, PHILADELPHIA, PA 19178-0805
PO BOX 780806, PHILADELPHIA, PA 19178-0806
PO BOX 780807, PHILADELPHIA, PA 19178-0807
PO BOX 780808, PHILADELPHIA, PA 19178-0808
PO BOX 780809, PHILADELPHIA, PA 19178-0809
PO BOX 780810, PHILADELPHIA, PA 19178-0810
PO BOX 780811, PHILADELPHIA, PA 19178-0811
PO BOX 780812, PHILADELPHIA, PA 19178-0812
PO BOX 780813, PHILADELPHIA, PA 19178-0813
PO BOX 780814, PHILADELPHIA, PA 19178-0814
PO BOX 780815, PHILADELPHIA, PA 19178-0815
PO BOX 780816, PHILADELPHIA, PA 19178-0816
PO BOX 780817, PHILADELPHIA, PA 19178-0817
PO BOX 780818, PHILADELPHIA, PA 19178-0818
PO BOX 780819, PHILADELPHIA, PA 19178-0819
PO BOX 780820, PHILADELPHIA, PA 19178-0820
PO BOX 780821, PHILADELPHIA, PA 19178-0821
PO BOX 780822, PHILADELPHIA, PA 19178-0822
PO BOX 780823, PHILADELPHIA, PA 19178-0823
PO BOX 780824, PHILADELPHIA, PA 19178-0824
PO BOX 780825, PHILADELPHIA, PA 19178-0825
PO BOX 780826, PHILADELPHIA, PA 19178-0826
PO BOX 780827, PHILADELPHIA, PA 19178-0827
PO BOX 780828, PHILADELPHIA, PA 19178-0828
PO BOX 780829, PHILADELPHIA, PA 19178-0829
PO BOX 780830, PHILADELPHIA, PA 19178-0830
PO BOX 780831, PHILADELPHIA, PA 19178-0831
PO BOX 780832, PHILADELPHIA, PA 19178-0832
PO BOX 780833, PHILADELPHIA, PA 19178-0833
PO BOX 780834, PHILADELPHIA, PA 19178-0834
PO BOX 780835, PHILADELPHIA, PA 19178-0835
PO BOX 780836, PHILADELPHIA, PA 19178-0836
PO BOX 780837, PHILADELPHIA, PA 19178-0837
PO BOX 780838, PHILADELPHIA, PA 19178-0838
PO BOX 780839, PHILADELPHIA, PA 19178-0839
PO BOX 780840, PHILADELPHIA, PA 19178-0840
PO BOX 780841, PHILADELPHIA, PA 19178-0841
PO BOX 780842, PHILADELPHIA, PA 19178-0842
PO BOX 780843, PHILADELPHIA, PA 19178-0843
PO BOX 780844, PHILADELPHIA, PA 19178-0844
PO BOX 780845, PHILADELPHIA, PA 19178-0845
PO BOX 780846, PHILADELPHIA, PA 19178-0846
PO BOX 780847, PHILADELPHIA, PA 19178-0847
PO BOX 780848, PHILADELPHIA, PA 19178-0848
PO BOX 780849, PHILADELPHIA, PA 19178-0849
PO BOX 780850, PHILADELPHIA, PA 19178-0850
PO BOX 780851, PHILADELPHIA, PA 19178-0851
PO BOX 780852, PHILADELPHIA, PA 19178-0852
PO BOX 780853, PHILADELPHIA, PA 19178-0853
PO BOX 780854, PHILADELPHIA, PA 19178-0854
PO BOX 780855, PHILADELPHIA, PA 19178-0855
PO BOX 780856, PHILADELPHIA, PA 19178-0856
PO BOX 780857, PHILADELPHIA, PA 19178-0857
PO BOX 780858, PHILADELPHIA, PA 19178-0858
PO BOX 780859, PHILADELPHIA, PA 19178-0859
PO BOX 780860, PHILADELPHIA, PA 19178-0860
PO BOX 780861, PHILADELPHIA, PA 19178-0861
PO BOX 780862, PHILADELPHIA, PA 19178-0862
PO BOX 780863, PHILADELPHIA, PA 19178-0863
PO BOX 780864, PHILADELPHIA, PA 19178-0864
PO BOX 780865, PHILADELPHIA, PA 19178-0865
PO BOX 780866, PHILADELPHIA, PA 19178-0866
PO BOX 780867, PHILADELPHIA, PA 19178-0867
PO BOX 780868, PHILADELPHIA, PA 19178-0868
PO BOX 780869, PHILADELPHIA, PA 19178-0869
PO BOX 780870, PHILADELPHIA, PA 19178-0870
PO BOX 780871, PHILADELPHIA, PA 19178-0871
PO BOX 780872, PHILADELPHIA, PA 19178-0872
PO BOX 780873, PHILADELPHIA, PA 19178-0873
PO BOX 780874, PHILADELPHIA, PA 19178-0874
PO BOX 780875, PHILADELPHIA, PA 19178-0875
PO BOX 780876, PHILADELPHIA, PA 19178-0876
PO BOX 780877, PHILADELPHIA, PA 19178-0877
PO BOX 780878, PHILADELPHIA, PA 19178-0878
PO BOX 780879, PHILADELPHIA, PA 19178-0879
PO BOX 780880, PHILADELPHIA, PA 19178-0880
PO BOX 780881, PHILADELPHIA, PA 19178-0881
PO BOX 780882, PHILADELPHIA, PA 19178-0882
PO BOX 780883, PHILADELPHIA, PA 19178-0883
PO BOX 780884, PHILADELPHIA, PA 19178-0884
PO BOX 780885, PHILADELPHIA, PA 19178-0885
PO BOX 780886, PHILADELPHIA, PA 19178-0886
PO BOX 780887, PHILADELPHIA, PA 19178-0887
PO BOX 780888, PHILADELPHIA, PA 19178-0888
PO BOX 780889, PHILADELPHIA, PA 19178-0889
PO BOX 780890, PHILADELPHIA, PA 19178-0890
PO BOX 780891, PHILADELPHIA, PA 19178-0891
PO BOX 780892, PHILADELPHIA, PA 19178-0892
PO BOX 780893, PHILADELPHIA, PA 19178-0893
PO BOX 780894, PHILADELPHIA, PA 19178-0894
PO BOX 780895, PHILADELPHIA, PA 19178-0895
PO BOX 780896, PHILADELPHIA, PA 19178-0896
PO BOX 780897, PHILADELPHIA, PA 19178-0897
PO BOX 780898, PHILADELPHIA, PA 19178-0898
PO BOX 780899, PHILADELPHIA, PA 19178-0899
PO BOX 780900, PHILADELPHIA, PA 19178-0900
PO BOX 780901, PHILADELPHIA, PA 19178-0901
PO BOX 780902, PHILADELPHIA, PA 19178-0902
PO BOX 780903, PHILADELPHIA, PA 19178-0903
PO BOX 780904, PHILADELPHIA, PA 19178-0904
PO BOX 780905, PHILADELPHIA, PA 19178-0905
PO BOX 780906, PHILADELPHIA, PA 19178-0906
PO BOX 780907, PHILADELPHIA, PA 19178-0907
PO BOX 780908, PHILADELPHIA, PA 19178-0908
PO BOX 780909, PHILADELPHIA, PA 19178-0909
PO BOX 780910, PHILADELPHIA, PA 19178-0910
PO BOX 780911, PHILADELPHIA, PA 19178-0911
PO BOX 780912, PHILADELPHIA, PA 19178-0912
PO BOX 780913, PHILADELPHIA, PA 19178-0913
PO BOX 780914, PHILADELPHIA, PA 19178-0914
PO BOX 780915, PHILADELPHIA, PA 19178-0915
PO BOX 780916, PHILADELPHIA, PA 19178-0916
PO BOX 780917, PHILADELPHIA, PA 19178-0917
PO BOX 780918, PHILADELPHIA, PA 19178-0918
PO BOX 780919, PHILADELPHIA, PA 19178-0919
PO BOX 780920, PHILADELPHIA, PA 19178-0920
PO BOX 780921, PHILADELPHIA, PA 19178-0921
PO BOX 780922, PHILADELPHIA, PA 19178-0922
PO BOX 780923, PHILADELPHIA, PA 19178-0923
PO BOX 780924, PHILADELPHIA, PA 19178-0924
PO BOX 780925, PHILADELPHIA, PA 19178-0925
PO BOX 780926, PHILADELPHIA, PA 19178-0926
PO BOX 780927, PHILADELPHIA, PA 19178-0927
PO BOX 780928, PHILADELPHIA, PA 19178-0928
PO BOX 780929, PHILADELPHIA, PA 19178-0929
PO BOX 780930, PHILADELPHIA, PA 19178-0930
PO BOX 780931, PHILADELPHIA, PA 19178-0931
PO BOX 780932, PHILADELPHIA, PA 19178-0932
PO BOX 780933, PHILADELPHIA, PA 19178-0933
PO BOX 780934, PHILADELPHIA, PA 19178-0934
PO BOX 780935, PHILADELPHIA, PA 19178-0935
PO BOX 780936, PHILADELPHIA, PA 19178-0936
PO BOX 780937, PHILADELPHIA, PA 19178-0937
PO BOX 780938, PHILADELPHIA, PA 19178-0938
PO BOX 780939, PHILADELPHIA, PA 19178-0939
PO BOX 780940, PHILADELPHIA, PA 19178-0940
PO BOX 780941, PHILADELPHIA, PA 19178-0941
PO BOX 780942, PHILADELPHIA, PA 19178-0942
PO BOX 780943, PHILADELPHIA, PA 19178-0943
PO BOX 780944, PHILADELPHIA, PA 19178-0944
PO BOX 780945, PHILADELPHIA, PA 19178-0945
PO BOX 780946, PHILADELPHIA, PA 19178-0946
PO BOX 780947, PHILADELPHIA, PA 19178-0947
PO BOX 780948, PHILADELPHIA, PA 19178-0948
PO BOX 780949, PHILADELPHIA, PA 19178-0949
PO BOX 780950, PHILADELPHIA, PA 19178-0950
PO BOX 780951, PHILADELPHIA, PA 19178-0951
PO BOX 780952, PHILADELPHIA, PA 19178-0952
PO BOX 780953, PHILADELPHIA, PA 19178-0953
PO BOX 780954, PHILADELPHIA, PA 19178-0954
PO BOX 780955, PHILADELPHIA, PA 19178-0955
PO BOX 780956, PHILADELPHIA, PA 19178-0956
PO BOX 780957, PHILADELPHIA, PA 19178-0957
PO BOX 780958, PHILADELPHIA, PA 19178-0958
PO BOX 780959, PHILADELPHIA, PA 19178-0959
PO BOX 780960, PHILADELPHIA, PA 19178-0960
PO BOX 780961, PHILADELPHIA, PA 19178-0961
PO BOX 780962, PHILADELPHIA, PA 19178-0962
PO BOX 780963, PHILADELPHIA, PA 19178-0963
PO BOX 780964, PHILADELPHIA, PA 19178-0964
PO BOX 780965, PHILADELPHIA, PA 19178-0965
PO BOX 780966, PHILADELPHIA, PA 19178-0966
PO BOX 780967, PHILADELPHIA, PA 19178-0967
PO BOX 780968, PHILADELPHIA, PA 19178-0968
PO BOX 780969, PHILADELPHIA, PA 19178-0969
PO BOX 780970, PHILADELPHIA, PA 19178-0970
PO BOX 780971, PHILADELPHIA, PA 19178-0971
PO BOX 780972, PHILADELPHIA, PA 19178-0972
PO BOX 780973, PHILADELPHIA, PA 19178-0973
PO BOX 780974, PHILADELPHIA, PA 19178-0974
PO BOX 780975, PHILADELPHIA, PA 19178-0975
PO BOX 780976, PHILADELPHIA, PA 19178-0976
PO BOX 780977, PHILADELPHIA, PA 19178-0977
PO BOX 780978, PHILADELPHIA, PA 19178-0978
PO BOX 780979, PHILADELPHIA, PA 19178-0979
PO BOX 780980, PHILADELPHIA, PA 19178-0980
PO BOX 780981, PHILADELPHIA, PA 19178-0981
PO BOX 780982, PHILADELPHIA, PA 19178-0982
PO BOX 780983, PHILADELPHIA, PA 19178-0983
PO BOX 780984, PHILADELPHIA, PA 19178-0984
PO BOX 780985, PHILADELPHIA, PA 19178-0985
PO BOX 780986, PHILADELPHIA, PA 19178-0986
PO BOX 780987, PHILADELPHIA, PA 19178-0987
PO BOX 780988, PHILADELPHIA, PA 19178-0988
PO BOX 780989, PHILADELPHIA, PA 19178-0989
PO BOX 780990, PHILADELPHIA, PA 19178-0990
PO BOX 780991, PHILADELPHIA, PA 19178-0991
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