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 MARTIN, CA 95046-0801
PO BOX 802, SAN MARTIN, CA 95046-0802
PO BOX 803, SAN MARTIN, CA 95046-0803
PO BOX 804, SAN MARTIN, CA 95046-0804
PO BOX 805, SAN MARTIN, CA 95046-0805
PO BOX 806, SAN MARTIN, CA 95046-0806
PO BOX 807, SAN MARTIN, CA 95046-0807
PO BOX 808, SAN MARTIN, CA 95046-0808
PO BOX 809, SAN MARTIN, CA 95046-0809
PO BOX 810, SAN MARTIN, CA 95046-0810
PO BOX 811, SAN MARTIN, CA 95046-0811
PO BOX 812, SAN MARTIN, CA 95046-0812
PO BOX 813, SAN MARTIN, CA 95046-0813
PO BOX 814, SAN MARTIN, CA 95046-0814
PO BOX 815, SAN MARTIN, CA 95046-0815
PO BOX 816, SAN MARTIN, CA 95046-0816
PO BOX 817, SAN MARTIN, CA 95046-0817
PO BOX 818, SAN MARTIN, CA 95046-0818
PO BOX 819, SAN MARTIN, CA 95046-0819
PO BOX 820, SAN MARTIN, CA 95046-0820
PO BOX 821, SAN MARTIN, CA 95046-0821
PO BOX 822, SAN MARTIN, CA 95046-0822
PO BOX 823, SAN MARTIN, CA 95046-0823
PO BOX 824, SAN MARTIN, CA 95046-0824
PO BOX 825, SAN MARTIN, CA 95046-0825
PO BOX 826, SAN MARTIN, CA 95046-0826
PO BOX 827, SAN MARTIN, CA 95046-0827
PO BOX 828, SAN MARTIN, CA 95046-0828
PO BOX 829, SAN MARTIN, CA 95046-0829
PO BOX 830, SAN MARTIN, CA 95046-0830
PO BOX 831, SAN MARTIN, CA 95046-0831
PO BOX 832, SAN MARTIN, CA 95046-0832
PO BOX 833, SAN MARTIN, CA 95046-0833
PO BOX 834, SAN MARTIN, CA 95046-0834
PO BOX 835, SAN MARTIN, CA 95046-0835
PO BOX 836, SAN MARTIN, CA 95046-0836
PO BOX 837, SAN MARTIN, CA 95046-0837
PO BOX 838, SAN MARTIN, CA 95046-0838
PO BOX 839, SAN MARTIN, CA 95046-0839
PO BOX 840, SAN MARTIN, CA 95046-0840
PO BOX 841, SAN MARTIN, CA 95046-0841
PO BOX 842, SAN MARTIN, CA 95046-0842
PO BOX 843, SAN MARTIN, CA 95046-0843
PO BOX 844, SAN MARTIN, CA 95046-0844
PO BOX 845, SAN MARTIN, CA 95046-0845
PO BOX 846, SAN MARTIN, CA 95046-0846
PO BOX 847, SAN MARTIN, CA 95046-0847
PO BOX 848, SAN MARTIN, CA 95046-0848
PO BOX 849, SAN MARTIN, CA 95046-0849
PO BOX 850, SAN MARTIN, CA 95046-0850
PO BOX 851, SAN MARTIN, CA 95046-0851
PO BOX 852, SAN MARTIN, CA 95046-0852
PO BOX 853, SAN MARTIN, CA 95046-0853
PO BOX 854, SAN MARTIN, CA 95046-0854
PO BOX 855, SAN MARTIN, CA 95046-0855
PO BOX 856, SAN MARTIN, CA 95046-0856
PO BOX 857, SAN MARTIN, CA 95046-0857
PO BOX 858, SAN MARTIN, CA 95046-0858
PO BOX 859, SAN MARTIN, CA 95046-0859
PO BOX 860, SAN MARTIN, CA 95046-0860
PO BOX 861, SAN MARTIN, CA 95046-0861
PO BOX 862, SAN MARTIN, CA 95046-0862
PO BOX 863, SAN MARTIN, CA 95046-0863
PO BOX 864, SAN MARTIN, CA 95046-0864
PO BOX 865, SAN MARTIN, CA 95046-0865
PO BOX 866, SAN MARTIN, CA 95046-0866
PO BOX 867, SAN MARTIN, CA 95046-0867
PO BOX 868, SAN MARTIN, CA 95046-0868
PO BOX 869, SAN MARTIN, CA 95046-0869
PO BOX 870, SAN MARTIN, CA 95046-0870
PO BOX 871, SAN MARTIN, CA 95046-0871
PO BOX 872, SAN MARTIN, CA 95046-0872
PO BOX 873, SAN MARTIN, CA 95046-0873
PO BOX 874, SAN MARTIN, CA 95046-0874
PO BOX 875, SAN MARTIN, CA 95046-0875
PO BOX 876, SAN MARTIN, CA 95046-0876
PO BOX 877, SAN MARTIN, CA 95046-0877
PO BOX 878, SAN MARTIN, CA 95046-0878
PO BOX 879, SAN MARTIN, CA 95046-0879
PO BOX 880, SAN MARTIN, CA 95046-0880
PO BOX 881, SAN MARTIN, CA 95046-0881
PO BOX 882, SAN MARTIN, CA 95046-0882
PO BOX 883, SAN MARTIN, CA 95046-0883
PO BOX 884, SAN MARTIN, CA 95046-0884
PO BOX 885, SAN MARTIN, CA 95046-0885
PO BOX 886, SAN MARTIN, CA 95046-0886
PO BOX 887, SAN MARTIN, CA 95046-0887
PO BOX 888, SAN MARTIN, CA 95046-0888
PO BOX 889, SAN MARTIN, CA 95046-0889
PO BOX 890, SAN MARTIN, CA 95046-0890
PO BOX 891, SAN MARTIN, CA 95046-0891
PO BOX 892, SAN MARTIN, CA 95046-0892
PO BOX 893, SAN MARTIN, CA 95046-0893
PO BOX 894, SAN MARTIN, CA 95046-0894
PO BOX 895, SAN MARTIN, CA 95046-0895
PO BOX 896, SAN MARTIN, CA 95046-0896
PO BOX 897, SAN MARTIN, CA 95046-0897
PO BOX 898, SAN MARTIN, CA 95046-0898
PO BOX 899, SAN MARTIN, CA 95046-0899
PO BOX 900, SAN MARTIN, CA 95046-0900
PO BOX 901, SAN MARTIN, CA 95046-0901
PO BOX 902, SAN MARTIN, CA 95046-0902
PO BOX 903, SAN MARTIN, CA 95046-0903
PO BOX 904, SAN MARTIN, CA 95046-0904
PO BOX 905, SAN MARTIN, CA 95046-0905
PO BOX 906, SAN MARTIN, CA 95046-0906
PO BOX 907, SAN MARTIN, CA 95046-0907
PO BOX 908, SAN MARTIN, CA 95046-0908
PO BOX 909, SAN MARTIN, CA 95046-0909
PO BOX 910, SAN MARTIN, CA 95046-0910
PO BOX 911, SAN MARTIN, CA 95046-0911
PO BOX 912, SAN MARTIN, CA 95046-0912
PO BOX 913, SAN MARTIN, CA 95046-0913
PO BOX 914, SAN MARTIN, CA 95046-0914
PO BOX 915, SAN MARTIN, CA 95046-0915
PO BOX 916, SAN MARTIN, CA 95046-0916
PO BOX 917, SAN MARTIN, CA 95046-0917
PO BOX 918, SAN MARTIN, CA 95046-0918
PO BOX 919, SAN MARTIN, CA 95046-0919
PO BOX 920, SAN MARTIN, CA 95046-0920
PO BOX 921, SAN MARTIN, CA 95046-0921
PO BOX 922, SAN MARTIN, CA 95046-0922
PO BOX 923, SAN MARTIN, CA 95046-0923
PO BOX 924, SAN MARTIN, CA 95046-0924
PO BOX 925, SAN MARTIN, CA 95046-0925
PO BOX 926, SAN MARTIN, CA 95046-0926
PO BOX 927, SAN MARTIN, CA 95046-0927
PO BOX 928, SAN MARTIN, CA 95046-0928
PO BOX 929, SAN MARTIN, CA 95046-0929
PO BOX 930, SAN MARTIN, CA 95046-0930
PO BOX 931, SAN MARTIN, CA 95046-0931
PO BOX 932, SAN MARTIN, CA 95046-0932
PO BOX 933, SAN MARTIN, CA 95046-0933
PO BOX 934, SAN MARTIN, CA 95046-0934
PO BOX 935, SAN MARTIN, CA 95046-0935
PO BOX 936, SAN MARTIN, CA 95046-0936
PO BOX 937, SAN MARTIN, CA 95046-0937
PO BOX 938, SAN MARTIN, CA 95046-0938
PO BOX 939, SAN MARTIN, CA 95046-0939
PO BOX 940, SAN MARTIN, CA 95046-0940
PO BOX 941, SAN MARTIN, CA 95046-0941
PO BOX 942, SAN MARTIN, CA 95046-0942
PO BOX 943, SAN MARTIN, CA 95046-0943
PO BOX 944, SAN MARTIN, CA 95046-0944
PO BOX 945, SAN MARTIN, CA 95046-0945
PO BOX 946, SAN MARTIN, CA 95046-0946
PO BOX 947, SAN MARTIN, CA 95046-0947
PO BOX 948, SAN MARTIN, CA 95046-0948
PO BOX 949, SAN MARTIN, CA 95046-0949
PO BOX 950, SAN MARTIN, CA 95046-0950
PO BOX 951, SAN MARTIN, CA 95046-0951
PO BOX 952, SAN MARTIN, CA 95046-0952
PO BOX 953, SAN MARTIN, CA 95046-0953
PO BOX 954, SAN MARTIN, CA 95046-0954
PO BOX 955, SAN MARTIN, CA 95046-0955
PO BOX 956, SAN MARTIN, CA 95046-0956
PO BOX 957, SAN MARTIN, CA 95046-0957
PO BOX 958, SAN MARTIN, CA 95046-0958
PO BOX 959, SAN MARTIN, CA 95046-0959
PO BOX 960, SAN MARTIN, CA 95046-0960
PO BOX 961, SAN MARTIN, CA 95046-0961
PO BOX 962, SAN MARTIN, CA 95046-0962
PO BOX 963, SAN MARTIN, CA 95046-0963
PO BOX 964, SAN MARTIN, CA 95046-0964
PO BOX 965, SAN MARTIN, CA 95046-0965
PO BOX 966, SAN MARTIN, CA 95046-0966
PO BOX 967, SAN MARTIN, CA 95046-0967
PO BOX 968, SAN MARTIN, CA 95046-0968
PO BOX 969, SAN MARTIN, CA 95046-0969
PO BOX 970, SAN MARTIN, CA 95046-0970
PO BOX 971, SAN MARTIN, CA 95046-0971
PO BOX 972, SAN MARTIN, CA 95046-0972
PO BOX 973, SAN MARTIN, CA 95046-0973
PO BOX 974, SAN MARTIN, CA 95046-0974
PO BOX 975, SAN MARTIN, CA 95046-0975
PO BOX 976, SAN MARTIN, CA 95046-0976
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