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 50781, IDAHO FALLS, ID 83405-0781
PO BOX 50782, IDAHO FALLS, ID 83405-0782
PO BOX 50783, IDAHO FALLS, ID 83405-0783
PO BOX 50784, IDAHO FALLS, ID 83405-0784
PO BOX 50785, IDAHO FALLS, ID 83405-0785
PO BOX 50786, IDAHO FALLS, ID 83405-0786
PO BOX 50787, IDAHO FALLS, ID 83405-0787
PO BOX 50788, IDAHO FALLS, ID 83405-0788
PO BOX 50789, IDAHO FALLS, ID 83405-0789
PO BOX 50790, IDAHO FALLS, ID 83405-0790
PO BOX 50791, IDAHO FALLS, ID 83405-0791
PO BOX 50792, IDAHO FALLS, ID 83405-0792
PO BOX 50793, IDAHO FALLS, ID 83405-0793
PO BOX 50794, IDAHO FALLS, ID 83405-0794
PO BOX 50795, IDAHO FALLS, ID 83405-0795
PO BOX 50796, IDAHO FALLS, ID 83405-0796
PO BOX 50797, IDAHO FALLS, ID 83405-0797
PO BOX 50798, IDAHO FALLS, ID 83405-0798
PO BOX 50799, IDAHO FALLS, ID 83405-0799
PO BOX 50800, IDAHO FALLS, ID 83405-0800
PO BOX 50801, IDAHO FALLS, ID 83405-0801
PO BOX 50802, IDAHO FALLS, ID 83405-0802
PO BOX 50803, IDAHO FALLS, ID 83405-0803
PO BOX 50804, IDAHO FALLS, ID 83405-0804
PO BOX 50805, IDAHO FALLS, ID 83405-0805
PO BOX 50806, IDAHO FALLS, ID 83405-0806
PO BOX 50807, IDAHO FALLS, ID 83405-0807
PO BOX 50808, IDAHO FALLS, ID 83405-0808
PO BOX 50809, IDAHO FALLS, ID 83405-0809
PO BOX 50810, IDAHO FALLS, ID 83405-0810
PO BOX 50811, IDAHO FALLS, ID 83405-0811
PO BOX 50812, IDAHO FALLS, ID 83405-0812
PO BOX 50813, IDAHO FALLS, ID 83405-0813
PO BOX 50814, IDAHO FALLS, ID 83405-0814
PO BOX 50815, IDAHO FALLS, ID 83405-0815
PO BOX 50816, IDAHO FALLS, ID 83405-0816
PO BOX 50817, IDAHO FALLS, ID 83405-0817
PO BOX 50818, IDAHO FALLS, ID 83405-0818
PO BOX 50819, IDAHO FALLS, ID 83405-0819
PO BOX 50820, IDAHO FALLS, ID 83405-0820
PO BOX 50821, IDAHO FALLS, ID 83405-0821
PO BOX 50822, IDAHO FALLS, ID 83405-0822
PO BOX 50823, IDAHO FALLS, ID 83405-0823
PO BOX 50824, IDAHO FALLS, ID 83405-0824
PO BOX 50825, IDAHO FALLS, ID 83405-0825
PO BOX 50826, IDAHO FALLS, ID 83405-0826
PO BOX 50827, IDAHO FALLS, ID 83405-0827
PO BOX 50828, IDAHO FALLS, ID 83405-0828
PO BOX 50829, IDAHO FALLS, ID 83405-0829
PO BOX 50830, IDAHO FALLS, ID 83405-0830
PO BOX 50831, IDAHO FALLS, ID 83405-0831
PO BOX 50832, IDAHO FALLS, ID 83405-0832
PO BOX 50833, IDAHO FALLS, ID 83405-0833
PO BOX 50834, IDAHO FALLS, ID 83405-0834
PO BOX 50835, IDAHO FALLS, ID 83405-0835
PO BOX 50836, IDAHO FALLS, ID 83405-0836
PO BOX 50837, IDAHO FALLS, ID 83405-0837
PO BOX 50838, IDAHO FALLS, ID 83405-0838
PO BOX 50839, IDAHO FALLS, ID 83405-0839
PO BOX 50840, IDAHO FALLS, ID 83405-0840
PO BOX 50841, IDAHO FALLS, ID 83405-0841
PO BOX 50842, IDAHO FALLS, ID 83405-0842
PO BOX 50843, IDAHO FALLS, ID 83405-0843
PO BOX 50844, IDAHO FALLS, ID 83405-0844
PO BOX 50845, IDAHO FALLS, ID 83405-0845
PO BOX 50846, IDAHO FALLS, ID 83405-0846
PO BOX 50847, IDAHO FALLS, ID 83405-0847
PO BOX 50848, IDAHO FALLS, ID 83405-0848
PO BOX 50849, IDAHO FALLS, ID 83405-0849
PO BOX 50850, IDAHO FALLS, ID 83405-0850
PO BOX 50851, IDAHO FALLS, ID 83405-0851
PO BOX 50852, IDAHO FALLS, ID 83405-0852
PO BOX 50853, IDAHO FALLS, ID 83405-0853
PO BOX 50854, IDAHO FALLS, ID 83405-0854
PO BOX 50855, IDAHO FALLS, ID 83405-0855
PO BOX 50856, IDAHO FALLS, ID 83405-0856
PO BOX 50857, IDAHO FALLS, ID 83405-0857
PO BOX 50858, IDAHO FALLS, ID 83405-0858
PO BOX 50859, IDAHO FALLS, ID 83405-0859
PO BOX 50860, IDAHO FALLS, ID 83405-0860
PO BOX 50861, IDAHO FALLS, ID 83405-0861
PO BOX 50862, IDAHO FALLS, ID 83405-0862
PO BOX 50863, IDAHO FALLS, ID 83405-0863
PO BOX 50864, IDAHO FALLS, ID 83405-0864
PO BOX 50865, IDAHO FALLS, ID 83405-0865
PO BOX 50866, IDAHO FALLS, ID 83405-0866
PO BOX 50867, IDAHO FALLS, ID 83405-0867
PO BOX 50868, IDAHO FALLS, ID 83405-0868
PO BOX 50869, IDAHO FALLS, ID 83405-0869
PO BOX 50870, IDAHO FALLS, ID 83405-0870
PO BOX 50871, IDAHO FALLS, ID 83405-0871
PO BOX 50872, IDAHO FALLS, ID 83405-0872
PO BOX 50873, IDAHO FALLS, ID 83405-0873
PO BOX 50874, IDAHO FALLS, ID 83405-0874
PO BOX 50875, IDAHO FALLS, ID 83405-0875
PO BOX 50876, IDAHO FALLS, ID 83405-0876
PO BOX 50877, IDAHO FALLS, ID 83405-0877
PO BOX 50878, IDAHO FALLS, ID 83405-0878
PO BOX 50879, IDAHO FALLS, ID 83405-0879
PO BOX 50880, IDAHO FALLS, ID 83405-0880
PO BOX 50881, IDAHO FALLS, ID 83405-0881
PO BOX 50882, IDAHO FALLS, ID 83405-0882
PO BOX 50883, IDAHO FALLS, ID 83405-0883
PO BOX 50884, IDAHO FALLS, ID 83405-0884
PO BOX 50885, IDAHO FALLS, ID 83405-0885
PO BOX 50886, IDAHO FALLS, ID 83405-0886
PO BOX 50887, IDAHO FALLS, ID 83405-0887
PO BOX 50888, IDAHO FALLS, ID 83405-0888
PO BOX 50889, IDAHO FALLS, ID 83405-0889
PO BOX 50890, IDAHO FALLS, ID 83405-0890
PO BOX 50891, IDAHO FALLS, ID 83405-0891
PO BOX 50892, IDAHO FALLS, ID 83405-0892
PO BOX 50893, IDAHO FALLS, ID 83405-0893
PO BOX 50894, IDAHO FALLS, ID 83405-0894
PO BOX 50895, IDAHO FALLS, ID 83405-0895
PO BOX 50896, IDAHO FALLS, ID 83405-0896
PO BOX 50897, IDAHO FALLS, ID 83405-0897
PO BOX 50898, IDAHO FALLS, ID 83405-0898
PO BOX 50899, IDAHO FALLS, ID 83405-0899
PO BOX 50900, IDAHO FALLS, ID 83405-0900
PO BOX 50901, IDAHO FALLS, ID 83405-0901
PO BOX 50902, IDAHO FALLS, ID 83405-0902
PO BOX 50903, IDAHO FALLS, ID 83405-0903
PO BOX 50904, IDAHO FALLS, ID 83405-0904
PO BOX 50905, IDAHO FALLS, ID 83405-0905
PO BOX 50906, IDAHO FALLS, ID 83405-0906
PO BOX 50907, IDAHO FALLS, ID 83405-0907
PO BOX 50908, IDAHO FALLS, ID 83405-0908
PO BOX 50909, IDAHO FALLS, ID 83405-0909
PO BOX 50910, IDAHO FALLS, ID 83405-0910
PO BOX 50911, IDAHO FALLS, ID 83405-0911
PO BOX 50912, IDAHO FALLS, ID 83405-0912
PO BOX 50913, IDAHO FALLS, ID 83405-0913
PO BOX 50914, IDAHO FALLS, ID 83405-0914
PO BOX 50915, IDAHO FALLS, ID 83405-0915
PO BOX 50916, IDAHO FALLS, ID 83405-0916
PO BOX 50917, IDAHO FALLS, ID 83405-0917
PO BOX 50918, IDAHO FALLS, ID 83405-0918
PO BOX 50919, IDAHO FALLS, ID 83405-0919
PO BOX 50920, IDAHO FALLS, ID 83405-0920
PO BOX 50921, IDAHO FALLS, ID 83405-0921
PO BOX 50922, IDAHO FALLS, ID 83405-0922
PO BOX 50923, IDAHO FALLS, ID 83405-0923
PO BOX 50924, IDAHO FALLS, ID 83405-0924
PO BOX 50925, IDAHO FALLS, ID 83405-0925
PO BOX 50926, IDAHO FALLS, ID 83405-0926
PO BOX 50927, IDAHO FALLS, ID 83405-0927
PO BOX 50928, IDAHO FALLS, ID 83405-0928
PO BOX 50929, IDAHO FALLS, ID 83405-0929
PO BOX 50930, IDAHO FALLS, ID 83405-0930
PO BOX 50931, IDAHO FALLS, ID 83405-0931
PO BOX 50932, IDAHO FALLS, ID 83405-0932
PO BOX 50933, IDAHO FALLS, ID 83405-0933
PO BOX 50934, IDAHO FALLS, ID 83405-0934
PO BOX 50935, IDAHO FALLS, ID 83405-0935
PO BOX 50936, IDAHO FALLS, ID 83405-0936
PO BOX 50937, IDAHO FALLS, ID 83405-0937
PO BOX 50938, IDAHO FALLS, ID 83405-0938
PO BOX 50939, IDAHO FALLS, ID 83405-0939
PO BOX 50940, IDAHO FALLS, ID 83405-0940
PO BOX 50941, IDAHO FALLS, ID 83405-0941
PO BOX 50942, IDAHO FALLS, ID 83405-0942
PO BOX 50943, IDAHO FALLS, ID 83405-0943
PO BOX 50944, IDAHO FALLS, ID 83405-0944
PO BOX 50945, IDAHO FALLS, ID 83405-0945
PO BOX 50946, IDAHO FALLS, ID 83405-0946
PO BOX 50947, IDAHO FALLS, ID 83405-0947
PO BOX 50948, IDAHO FALLS, ID 83405-0948
PO BOX 50949, IDAHO FALLS, ID 83405-0949
PO BOX 50950, IDAHO FALLS, ID 83405-0950
PO BOX 50951, IDAHO FALLS, ID 83405-0951
PO BOX 50952, IDAHO FALLS, ID 83405-0952
PO BOX 50953, IDAHO FALLS, ID 83405-0953
PO BOX 50954, IDAHO FALLS, ID 83405-0954
PO BOX 50955, IDAHO FALLS, ID 83405-0955
PO BOX 50956, IDAHO FALLS, ID 83405-0956
PO BOX 50957, IDAHO FALLS, ID 83405-0957
PO BOX 50958, IDAHO FALLS, ID 83405-0958
PO BOX 50959, IDAHO FALLS, ID 83405-0959
PO BOX 50960, IDAHO FALLS, ID 83405-0960
PO BOX 50961, IDAHO FALLS, ID 83405-0961
PO BOX 50962, IDAHO FALLS, ID 83405-0962
PO BOX 50963, IDAHO FALLS, ID 83405-0963
PO BOX 50964, IDAHO FALLS, ID 83405-0964
PO BOX 50965, IDAHO FALLS, ID 83405-0965
PO BOX 50966, IDAHO FALLS, ID 83405-0966
PO BOX 50967, IDAHO FALLS, ID 83405-0967
PO BOX 50968, IDAHO FALLS, ID 83405-0968
PO BOX 50969, IDAHO FALLS, ID 83405-0969
PO BOX 50970, IDAHO FALLS, ID 83405-0970
PO BOX 50971, IDAHO FALLS, ID 83405-0971
PO BOX 50972, IDAHO FALLS, ID 83405-0972
PO BOX 50973, IDAHO FALLS, ID 83405-0973
PO BOX 50974, IDAHO FALLS, ID 83405-0974
PO BOX 50975, IDAHO FALLS, ID 83405-0975
PO BOX 50976, IDAHO FALLS, ID 83405-0976
PO BOX 50977, IDAHO FALLS, ID 83405-0977
PO BOX 50978, IDAHO FALLS, ID 83405-0978
PO BOX 50979, IDAHO FALLS, ID 83405-0979
PO BOX 50980, IDAHO FALLS, ID 83405-0980
PO BOX 50981, IDAHO FALLS, ID 83405-0981
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