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 801, SAN FERNANDO, CA 91341-0801
PO BOX 802, SAN FERNANDO, CA 91341-0802
PO BOX 803, SAN FERNANDO, CA 91341-0803
PO BOX 804, SAN FERNANDO, CA 91341-0804
PO BOX 805, SAN FERNANDO, CA 91341-0805
PO BOX 806, SAN FERNANDO, CA 91341-0806
PO BOX 807, SAN FERNANDO, CA 91341-0807
PO BOX 808, SAN FERNANDO, CA 91341-0808
PO BOX 809, SAN FERNANDO, CA 91341-0809
PO BOX 810, SAN FERNANDO, CA 91341-0810
PO BOX 811, SAN FERNANDO, CA 91341-0811
PO BOX 812, SAN FERNANDO, CA 91341-0812
PO BOX 813, SAN FERNANDO, CA 91341-0813
PO BOX 814, SAN FERNANDO, CA 91341-0814
PO BOX 815, SAN FERNANDO, CA 91341-0815
PO BOX 816, SAN FERNANDO, CA 91341-0816
PO BOX 817, SAN FERNANDO, CA 91341-0817
PO BOX 818, SAN FERNANDO, CA 91341-0818
PO BOX 819, SAN FERNANDO, CA 91341-0819
PO BOX 820, SAN FERNANDO, CA 91341-0820
PO BOX 821, SAN FERNANDO, CA 91341-0821
PO BOX 822, SAN FERNANDO, CA 91341-0822
PO BOX 823, SAN FERNANDO, CA 91341-0823
PO BOX 824, SAN FERNANDO, CA 91341-0824
PO BOX 825, SAN FERNANDO, CA 91341-0825
PO BOX 826, SAN FERNANDO, CA 91341-0826
PO BOX 827, SAN FERNANDO, CA 91341-0827
PO BOX 828, SAN FERNANDO, CA 91341-0828
PO BOX 829, SAN FERNANDO, CA 91341-0829
PO BOX 830, SAN FERNANDO, CA 91341-0830
PO BOX 831, SAN FERNANDO, CA 91341-0831
PO BOX 832, SAN FERNANDO, CA 91341-0832
PO BOX 833, SAN FERNANDO, CA 91341-0833
PO BOX 834, SAN FERNANDO, CA 91341-0834
PO BOX 835, SAN FERNANDO, CA 91341-0835
PO BOX 836, SAN FERNANDO, CA 91341-0836
PO BOX 837, SAN FERNANDO, CA 91341-0837
PO BOX 838, SAN FERNANDO, CA 91341-0838
PO BOX 839, SAN FERNANDO, CA 91341-0839
PO BOX 840, SAN FERNANDO, CA 91341-0840
PO BOX 841, SAN FERNANDO, CA 91341-0841
PO BOX 842, SAN FERNANDO, CA 91341-0842
PO BOX 843, SAN FERNANDO, CA 91341-0843
PO BOX 844, SAN FERNANDO, CA 91341-0844
PO BOX 845, SAN FERNANDO, CA 91341-0845
PO BOX 846, SAN FERNANDO, CA 91341-0846
PO BOX 847, SAN FERNANDO, CA 91341-0847
PO BOX 848, SAN FERNANDO, CA 91341-0848
PO BOX 849, SAN FERNANDO, CA 91341-0849
PO BOX 850, SAN FERNANDO, CA 91341-0850
PO BOX 851, SAN FERNANDO, CA 91341-0851
PO BOX 852, SAN FERNANDO, CA 91341-0852
PO BOX 853, SAN FERNANDO, CA 91341-0853
PO BOX 854, SAN FERNANDO, CA 91341-0854
PO BOX 855, SAN FERNANDO, CA 91341-0855
PO BOX 856, SAN FERNANDO, CA 91341-0856
PO BOX 857, SAN FERNANDO, CA 91341-0857
PO BOX 858, SAN FERNANDO, CA 91341-0858
PO BOX 859, SAN FERNANDO, CA 91341-0859
PO BOX 860, SAN FERNANDO, CA 91341-0860
PO BOX 861, SAN FERNANDO, CA 91341-0861
PO BOX 862, SAN FERNANDO, CA 91341-0862
PO BOX 863, SAN FERNANDO, CA 91341-0863
PO BOX 864, SAN FERNANDO, CA 91341-0864
PO BOX 865, SAN FERNANDO, CA 91341-0865
PO BOX 866, SAN FERNANDO, CA 91341-0866
PO BOX 867, SAN FERNANDO, CA 91341-0867
PO BOX 868, SAN FERNANDO, CA 91341-0868
PO BOX 869, SAN FERNANDO, CA 91341-0869
PO BOX 870, SAN FERNANDO, CA 91341-0870
PO BOX 871, SAN FERNANDO, CA 91341-0871
PO BOX 872, SAN FERNANDO, CA 91341-0872
PO BOX 873, SAN FERNANDO, CA 91341-0873
PO BOX 874, SAN FERNANDO, CA 91341-0874
PO BOX 875, SAN FERNANDO, CA 91341-0875
PO BOX 876, SAN FERNANDO, CA 91341-0876
PO BOX 877, SAN FERNANDO, CA 91341-0877
PO BOX 878, SAN FERNANDO, CA 91341-0878
PO BOX 879, SAN FERNANDO, CA 91341-0879
PO BOX 880, SAN FERNANDO, CA 91341-0880
PO BOX 881, SAN FERNANDO, CA 91341-0881
PO BOX 882, SAN FERNANDO, CA 91341-0882
PO BOX 883, SAN FERNANDO, CA 91341-0883
PO BOX 884, SAN FERNANDO, CA 91341-0884
PO BOX 885, SAN FERNANDO, CA 91341-0885
PO BOX 886, SAN FERNANDO, CA 91341-0886
PO BOX 887, SAN FERNANDO, CA 91341-0887
PO BOX 888, SAN FERNANDO, CA 91341-0888
PO BOX 889, SAN FERNANDO, CA 91341-0889
PO BOX 890, SAN FERNANDO, CA 91341-0890
PO BOX 891, SAN FERNANDO, CA 91341-0891
PO BOX 892, SAN FERNANDO, CA 91341-0892
PO BOX 893, SAN FERNANDO, CA 91341-0893
PO BOX 894, SAN FERNANDO, CA 91341-0894
PO BOX 895, SAN FERNANDO, CA 91341-0895
PO BOX 896, SAN FERNANDO, CA 91341-0896
PO BOX 897, SAN FERNANDO, CA 91341-0897
PO BOX 898, SAN FERNANDO, CA 91341-0898
PO BOX 899, SAN FERNANDO, CA 91341-0899
PO BOX 900, SAN FERNANDO, CA 91341-0900
PO BOX 901, SAN FERNANDO, CA 91341-0901
PO BOX 902, SAN FERNANDO, CA 91341-0902
PO BOX 903, SAN FERNANDO, CA 91341-0903
PO BOX 904, SAN FERNANDO, CA 91341-0904
PO BOX 905, SAN FERNANDO, CA 91341-0905
PO BOX 906, SAN FERNANDO, CA 91341-0906
PO BOX 907, SAN FERNANDO, CA 91341-0907
PO BOX 908, SAN FERNANDO, CA 91341-0908
PO BOX 909, SAN FERNANDO, CA 91341-0909
PO BOX 910, SAN FERNANDO, CA 91341-0910
PO BOX 911, SAN FERNANDO, CA 91341-0911
PO BOX 912, SAN FERNANDO, CA 91341-0912
PO BOX 913, SAN FERNANDO, CA 91341-0913
PO BOX 914, SAN FERNANDO, CA 91341-0914
PO BOX 915, SAN FERNANDO, CA 91341-0915
PO BOX 916, SAN FERNANDO, CA 91341-0916
PO BOX 917, SAN FERNANDO, CA 91341-0917
PO BOX 918, SAN FERNANDO, CA 91341-0918
PO BOX 919, SAN FERNANDO, CA 91341-0919
PO BOX 920, SAN FERNANDO, CA 91341-0920
PO BOX 921, SAN FERNANDO, CA 91341-0921
PO BOX 922, SAN FERNANDO, CA 91341-0922
PO BOX 923, SAN FERNANDO, CA 91341-0923
PO BOX 924, SAN FERNANDO, CA 91341-0924
PO BOX 925, SAN FERNANDO, CA 91341-0925
PO BOX 926, SAN FERNANDO, CA 91341-0926
PO BOX 927, SAN FERNANDO, CA 91341-0927
PO BOX 928, SAN FERNANDO, CA 91341-0928
PO BOX 929, SAN FERNANDO, CA 91341-0929
PO BOX 930, SAN FERNANDO, CA 91341-0930
PO BOX 931, SAN FERNANDO, CA 91341-0931
PO BOX 932, SAN FERNANDO, CA 91341-0932
PO BOX 933, SAN FERNANDO, CA 91341-0933
PO BOX 934, SAN FERNANDO, CA 91341-0934
PO BOX 935, SAN FERNANDO, CA 91341-0935
PO BOX 936, SAN FERNANDO, CA 91341-0936
PO BOX 937, SAN FERNANDO, CA 91341-0937
PO BOX 938, SAN FERNANDO, CA 91341-0938
PO BOX 939, SAN FERNANDO, CA 91341-0939
PO BOX 940, SAN FERNANDO, CA 91341-0940
PO BOX 941, SAN FERNANDO, CA 91341-0941
PO BOX 942, SAN FERNANDO, CA 91341-0942
PO BOX 943, SAN FERNANDO, CA 91341-0943
PO BOX 944, SAN FERNANDO, CA 91341-0944
PO BOX 945, SAN FERNANDO, CA 91341-0945
PO BOX 946, SAN FERNANDO, CA 91341-0946
PO BOX 947, SAN FERNANDO, CA 91341-0947
PO BOX 948, SAN FERNANDO, CA 91341-0948
PO BOX 949, SAN FERNANDO, CA 91341-0949
PO BOX 950, SAN FERNANDO, CA 91341-0950
PO BOX 951, SAN FERNANDO, CA 91341-0951
PO BOX 952, SAN FERNANDO, CA 91341-0952
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