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 771, VALLEY CENTER, CA 92082-0771
PO BOX 772, VALLEY CENTER, CA 92082-0772
PO BOX 773, VALLEY CENTER, CA 92082-0773
PO BOX 774, VALLEY CENTER, CA 92082-0774
PO BOX 775, VALLEY CENTER, CA 92082-0775
PO BOX 776, VALLEY CENTER, CA 92082-0776
PO BOX 777, VALLEY CENTER, CA 92082-0777
PO BOX 778, VALLEY CENTER, CA 92082-0778
PO BOX 779, VALLEY CENTER, CA 92082-0779
PO BOX 780, VALLEY CENTER, CA 92082-0780
PO BOX 781, VALLEY CENTER, CA 92082-0781
PO BOX 782, VALLEY CENTER, CA 92082-0782
PO BOX 783, VALLEY CENTER, CA 92082-0783
PO BOX 784, VALLEY CENTER, CA 92082-0784
PO BOX 785, VALLEY CENTER, CA 92082-0785
PO BOX 786, VALLEY CENTER, CA 92082-0786
PO BOX 787, VALLEY CENTER, CA 92082-0787
PO BOX 788, VALLEY CENTER, CA 92082-0788
PO BOX 789, VALLEY CENTER, CA 92082-0789
PO BOX 790, VALLEY CENTER, CA 92082-0790
PO BOX 791, VALLEY CENTER, CA 92082-0791
PO BOX 792, VALLEY CENTER, CA 92082-0792
PO BOX 793, VALLEY CENTER, CA 92082-0793
PO BOX 794, VALLEY CENTER, CA 92082-0794
PO BOX 795, VALLEY CENTER, CA 92082-0795
PO BOX 796, VALLEY CENTER, CA 92082-0796
PO BOX 797, VALLEY CENTER, CA 92082-0797
PO BOX 798, VALLEY CENTER, CA 92082-0798
PO BOX 799, VALLEY CENTER, CA 92082-0799
PO BOX 800, VALLEY CENTER, CA 92082-0800
PO BOX 801, VALLEY CENTER, CA 92082-0801
PO BOX 802, VALLEY CENTER, CA 92082-0802
PO BOX 803, VALLEY CENTER, CA 92082-0803
PO BOX 804, VALLEY CENTER, CA 92082-0804
PO BOX 805, VALLEY CENTER, CA 92082-0805
PO BOX 806, VALLEY CENTER, CA 92082-0806
PO BOX 807, VALLEY CENTER, CA 92082-0807
PO BOX 808, VALLEY CENTER, CA 92082-0808
PO BOX 809, VALLEY CENTER, CA 92082-0809
PO BOX 810, VALLEY CENTER, CA 92082-0810
PO BOX 811, VALLEY CENTER, CA 92082-0811
PO BOX 812, VALLEY CENTER, CA 92082-0812
PO BOX 813, VALLEY CENTER, CA 92082-0813
PO BOX 814, VALLEY CENTER, CA 92082-0814
PO BOX 815, VALLEY CENTER, CA 92082-0815
PO BOX 816, VALLEY CENTER, CA 92082-0816
PO BOX 817, VALLEY CENTER, CA 92082-0817
PO BOX 818, VALLEY CENTER, CA 92082-0818
PO BOX 819, VALLEY CENTER, CA 92082-0819
PO BOX 820, VALLEY CENTER, CA 92082-0820
PO BOX 821, VALLEY CENTER, CA 92082-0821
PO BOX 822, VALLEY CENTER, CA 92082-0822
PO BOX 823, VALLEY CENTER, CA 92082-0823
PO BOX 824, VALLEY CENTER, CA 92082-0824
PO BOX 825, VALLEY CENTER, CA 92082-0825
PO BOX 826, VALLEY CENTER, CA 92082-0826
PO BOX 827, VALLEY CENTER, CA 92082-0827
PO BOX 828, VALLEY CENTER, CA 92082-0828
PO BOX 829, VALLEY CENTER, CA 92082-0829
PO BOX 830, VALLEY CENTER, CA 92082-0830
PO BOX 831, VALLEY CENTER, CA 92082-0831
PO BOX 832, VALLEY CENTER, CA 92082-0832
PO BOX 833, VALLEY CENTER, CA 92082-0833
PO BOX 834, VALLEY CENTER, CA 92082-0834
PO BOX 835, VALLEY CENTER, CA 92082-0835
PO BOX 836, VALLEY CENTER, CA 92082-0836
PO BOX 837, VALLEY CENTER, CA 92082-0837
PO BOX 838, VALLEY CENTER, CA 92082-0838
PO BOX 839, VALLEY CENTER, CA 92082-0839
PO BOX 840, VALLEY CENTER, CA 92082-0840
PO BOX 841, VALLEY CENTER, CA 92082-0841
PO BOX 842, VALLEY CENTER, CA 92082-0842
PO BOX 843, VALLEY CENTER, CA 92082-0843
PO BOX 844, VALLEY CENTER, CA 92082-0844
PO BOX 845, VALLEY CENTER, CA 92082-0845
PO BOX 846, VALLEY CENTER, CA 92082-0846
PO BOX 847, VALLEY CENTER, CA 92082-0847
PO BOX 848, VALLEY CENTER, CA 92082-0848
PO BOX 849, VALLEY CENTER, CA 92082-0849
PO BOX 850, VALLEY CENTER, CA 92082-0850
PO BOX 851, VALLEY CENTER, CA 92082-0851
PO BOX 852, VALLEY CENTER, CA 92082-0852
PO BOX 853, VALLEY CENTER, CA 92082-0853
PO BOX 854, VALLEY CENTER, CA 92082-0854
PO BOX 855, VALLEY CENTER, CA 92082-0855
PO BOX 856, VALLEY CENTER, CA 92082-0856
PO BOX 857, VALLEY CENTER, CA 92082-0857
PO BOX 858, VALLEY CENTER, CA 92082-0858
PO BOX 859, VALLEY CENTER, CA 92082-0859
PO BOX 860, VALLEY CENTER, CA 92082-0860
PO BOX 861, VALLEY CENTER, CA 92082-0861
PO BOX 862, VALLEY CENTER, CA 92082-0862
PO BOX 863, VALLEY CENTER, CA 92082-0863
PO BOX 864, VALLEY CENTER, CA 92082-0864
PO BOX 865, VALLEY CENTER, CA 92082-0865
PO BOX 866, VALLEY CENTER, CA 92082-0866
PO BOX 867, VALLEY CENTER, CA 92082-0867
PO BOX 868, VALLEY CENTER, CA 92082-0868
PO BOX 869, VALLEY CENTER, CA 92082-0869
PO BOX 870, VALLEY CENTER, CA 92082-0870
PO BOX 871, VALLEY CENTER, CA 92082-0871
PO BOX 872, VALLEY CENTER, CA 92082-0872
PO BOX 873, VALLEY CENTER, CA 92082-0873
PO BOX 874, VALLEY CENTER, CA 92082-0874
PO BOX 875, VALLEY CENTER, CA 92082-0875
PO BOX 876, VALLEY CENTER, CA 92082-0876
PO BOX 877, VALLEY CENTER, CA 92082-0877
PO BOX 878, VALLEY CENTER, CA 92082-0878
PO BOX 879, VALLEY CENTER, CA 92082-0879
PO BOX 880, VALLEY CENTER, CA 92082-0880
PO BOX 881, VALLEY CENTER, CA 92082-0881
PO BOX 882, VALLEY CENTER, CA 92082-0882
PO BOX 883, VALLEY CENTER, CA 92082-0883
PO BOX 884, VALLEY CENTER, CA 92082-0884
PO BOX 885, VALLEY CENTER, CA 92082-0885
PO BOX 886, VALLEY CENTER, CA 92082-0886
PO BOX 887, VALLEY CENTER, CA 92082-0887
PO BOX 888, VALLEY CENTER, CA 92082-0888
PO BOX 889, VALLEY CENTER, CA 92082-0889
PO BOX 890, VALLEY CENTER, CA 92082-0890
PO BOX 891, VALLEY CENTER, CA 92082-0891
PO BOX 892, VALLEY CENTER, CA 92082-0892
PO BOX 893, VALLEY CENTER, CA 92082-0893
PO BOX 894, VALLEY CENTER, CA 92082-0894
PO BOX 895, VALLEY CENTER, CA 92082-0895
PO BOX 896, VALLEY CENTER, CA 92082-0896
PO BOX 897, VALLEY CENTER, CA 92082-0897
PO BOX 898, VALLEY CENTER, CA 92082-0898
PO BOX 899, VALLEY CENTER, CA 92082-0899
PO BOX 900, VALLEY CENTER, CA 92082-0900
PO BOX 901, VALLEY CENTER, CA 92082-0901
PO BOX 902, VALLEY CENTER, CA 92082-0902
PO BOX 903, VALLEY CENTER, CA 92082-0903
PO BOX 904, VALLEY CENTER, CA 92082-0904
PO BOX 905, VALLEY CENTER, CA 92082-0905
PO BOX 906, VALLEY CENTER, CA 92082-0906
PO BOX 907, VALLEY CENTER, CA 92082-0907
PO BOX 908, VALLEY CENTER, CA 92082-0908
PO BOX 909, VALLEY CENTER, CA 92082-0909
PO BOX 910, VALLEY CENTER, CA 92082-0910
PO BOX 911, VALLEY CENTER, CA 92082-0911
PO BOX 912, VALLEY CENTER, CA 92082-0912
PO BOX 913, VALLEY CENTER, CA 92082-0913
PO BOX 914, VALLEY CENTER, CA 92082-0914
PO BOX 915, VALLEY CENTER, CA 92082-0915
PO BOX 916, VALLEY CENTER, CA 92082-0916
PO BOX 917, VALLEY CENTER, CA 92082-0917
PO BOX 918, VALLEY CENTER, CA 92082-0918
PO BOX 919, VALLEY CENTER, CA 92082-0919
PO BOX 920, VALLEY CENTER, CA 92082-0920
PO BOX 921, VALLEY CENTER, CA 92082-0921
PO BOX 922, VALLEY CENTER, CA 92082-0922
PO BOX 923, VALLEY CENTER, CA 92082-0923
PO BOX 924, VALLEY CENTER, CA 92082-0924
PO BOX 925, VALLEY CENTER, CA 92082-0925
PO BOX 926, VALLEY CENTER, CA 92082-0926
PO BOX 927, VALLEY CENTER, CA 92082-0927
PO BOX 928, VALLEY CENTER, CA 92082-0928
PO BOX 929, VALLEY CENTER, CA 92082-0929
PO BOX 930, VALLEY CENTER, CA 92082-0930
PO BOX 931, VALLEY CENTER, CA 92082-0931
PO BOX 932, VALLEY CENTER, CA 92082-0932
PO BOX 933, VALLEY CENTER, CA 92082-0933
PO BOX 934, VALLEY CENTER, CA 92082-0934
PO BOX 935, VALLEY CENTER, CA 92082-0935
PO BOX 936, VALLEY CENTER, CA 92082-0936
PO BOX 937, VALLEY CENTER, CA 92082-0937
PO BOX 938, VALLEY CENTER, CA 92082-0938
PO BOX 939, VALLEY CENTER, CA 92082-0939
PO BOX 940, VALLEY CENTER, CA 92082-0940
PO BOX 941, VALLEY CENTER, CA 92082-0941
PO BOX 942, VALLEY CENTER, CA 92082-0942
PO BOX 943, VALLEY CENTER, CA 92082-0943
PO BOX 944, VALLEY CENTER, CA 92082-0944
PO BOX 945, VALLEY CENTER, CA 92082-0945
PO BOX 946, VALLEY CENTER, CA 92082-0946
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