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 432760, SAN YSIDRO, CA 92143-2760
PO BOX 432761, SAN YSIDRO, CA 92143-2761
PO BOX 432762, SAN YSIDRO, CA 92143-2762
PO BOX 432763, SAN YSIDRO, CA 92143-2763
PO BOX 432764, SAN YSIDRO, CA 92143-2764
PO BOX 432765, SAN YSIDRO, CA 92143-2765
PO BOX 432766, SAN YSIDRO, CA 92143-2766
PO BOX 432767, SAN YSIDRO, CA 92143-2767
PO BOX 432768, SAN YSIDRO, CA 92143-2768
PO BOX 432769, SAN YSIDRO, CA 92143-2769
PO BOX 432770, SAN YSIDRO, CA 92143-2770
PO BOX 432771, SAN YSIDRO, CA 92143-2771
PO BOX 432772, SAN YSIDRO, CA 92143-2772
PO BOX 432773, SAN YSIDRO, CA 92143-2773
PO BOX 432774, SAN YSIDRO, CA 92143-2774
PO BOX 432775, SAN YSIDRO, CA 92143-2775
PO BOX 432776, SAN YSIDRO, CA 92143-2776
PO BOX 432777, SAN YSIDRO, CA 92143-2777
PO BOX 432778, SAN YSIDRO, CA 92143-2778
PO BOX 432779, SAN YSIDRO, CA 92143-2779
PO BOX 432780, SAN YSIDRO, CA 92143-2780
PO BOX 432781, SAN YSIDRO, CA 92143-2781
PO BOX 432782, SAN YSIDRO, CA 92143-2782
PO BOX 432783, SAN YSIDRO, CA 92143-2783
PO BOX 432784, SAN YSIDRO, CA 92143-2784
PO BOX 432785, SAN YSIDRO, CA 92143-2785
PO BOX 432786, SAN YSIDRO, CA 92143-2786
PO BOX 432787, SAN YSIDRO, CA 92143-2787
PO BOX 432788, SAN YSIDRO, CA 92143-2788
PO BOX 432789, SAN YSIDRO, CA 92143-2789
PO BOX 432790, SAN YSIDRO, CA 92143-2790
PO BOX 432791, SAN YSIDRO, CA 92143-2791
PO BOX 432792, SAN YSIDRO, CA 92143-2792
PO BOX 432793, SAN YSIDRO, CA 92143-2793
PO BOX 432794, SAN YSIDRO, CA 92143-2794
PO BOX 432795, SAN YSIDRO, CA 92143-2795
PO BOX 432796, SAN YSIDRO, CA 92143-2796
PO BOX 432797, SAN YSIDRO, CA 92143-2797
PO BOX 432798, SAN YSIDRO, CA 92143-2798
PO BOX 432799, SAN YSIDRO, CA 92143-2799
PO BOX 432800, SAN YSIDRO, CA 92143-2800
PO BOX 432801, SAN YSIDRO, CA 92143-2801
PO BOX 432802, SAN YSIDRO, CA 92143-2802
PO BOX 432803, SAN YSIDRO, CA 92143-2803
PO BOX 432804, SAN YSIDRO, CA 92143-2804
PO BOX 432805, SAN YSIDRO, CA 92143-2805
PO BOX 432806, SAN YSIDRO, CA 92143-2806
PO BOX 432807, SAN YSIDRO, CA 92143-2807
PO BOX 432808, SAN YSIDRO, CA 92143-2808
PO BOX 432809, SAN YSIDRO, CA 92143-2809
PO BOX 432810, SAN YSIDRO, CA 92143-2810
PO BOX 432811, SAN YSIDRO, CA 92143-2811
PO BOX 432812, SAN YSIDRO, CA 92143-2812
PO BOX 432813, SAN YSIDRO, CA 92143-2813
PO BOX 432814, SAN YSIDRO, CA 92143-2814
PO BOX 432815, SAN YSIDRO, CA 92143-2815
PO BOX 432816, SAN YSIDRO, CA 92143-2816
PO BOX 432817, SAN YSIDRO, CA 92143-2817
PO BOX 432818, SAN YSIDRO, CA 92143-2818
PO BOX 432819, SAN YSIDRO, CA 92143-2819
PO BOX 432820, SAN YSIDRO, CA 92143-2820
PO BOX 432821, SAN YSIDRO, CA 92143-2821
PO BOX 432822, SAN YSIDRO, CA 92143-2822
PO BOX 432823, SAN YSIDRO, CA 92143-2823
PO BOX 432824, SAN YSIDRO, CA 92143-2824
PO BOX 432825, SAN YSIDRO, CA 92143-2825
PO BOX 432826, SAN YSIDRO, CA 92143-2826
PO BOX 432827, SAN YSIDRO, CA 92143-2827
PO BOX 432828, SAN YSIDRO, CA 92143-2828
PO BOX 432829, SAN YSIDRO, CA 92143-2829
PO BOX 432830, SAN YSIDRO, CA 92143-2830
PO BOX 432831, SAN YSIDRO, CA 92143-2831
PO BOX 432832, SAN YSIDRO, CA 92143-2832
PO BOX 432833, SAN YSIDRO, CA 92143-2833
PO BOX 432834, SAN YSIDRO, CA 92143-2834
PO BOX 432835, SAN YSIDRO, CA 92143-2835
PO BOX 432836, SAN YSIDRO, CA 92143-2836
PO BOX 432837, SAN YSIDRO, CA 92143-2837
PO BOX 432838, SAN YSIDRO, CA 92143-2838
PO BOX 432839, SAN YSIDRO, CA 92143-2839
PO BOX 432840, SAN YSIDRO, CA 92143-2840
PO BOX 432841, SAN YSIDRO, CA 92143-2841
PO BOX 432842, SAN YSIDRO, CA 92143-2842
PO BOX 432843, SAN YSIDRO, CA 92143-2843
PO BOX 432844, SAN YSIDRO, CA 92143-2844
PO BOX 432845, SAN YSIDRO, CA 92143-2845
PO BOX 432846, SAN YSIDRO, CA 92143-2846
PO BOX 432847, SAN YSIDRO, CA 92143-2847
PO BOX 432848, SAN YSIDRO, CA 92143-2848
PO BOX 432849, SAN YSIDRO, CA 92143-2849
PO BOX 432850, SAN YSIDRO, CA 92143-2850
PO BOX 432851, SAN YSIDRO, CA 92143-2851
PO BOX 432852, SAN YSIDRO, CA 92143-2852
PO BOX 432853, SAN YSIDRO, CA 92143-2853
PO BOX 432854, SAN YSIDRO, CA 92143-2854
PO BOX 432855, SAN YSIDRO, CA 92143-2855
PO BOX 432856, SAN YSIDRO, CA 92143-2856
PO BOX 432857, SAN YSIDRO, CA 92143-2857
PO BOX 432858, SAN YSIDRO, CA 92143-2858
PO BOX 432859, SAN YSIDRO, CA 92143-2859
PO BOX 432860, SAN YSIDRO, CA 92143-2860
PO BOX 432861, SAN YSIDRO, CA 92143-2861
PO BOX 432862, SAN YSIDRO, CA 92143-2862
PO BOX 432863, SAN YSIDRO, CA 92143-2863
PO BOX 432864, SAN YSIDRO, CA 92143-2864
PO BOX 432865, SAN YSIDRO, CA 92143-2865
PO BOX 432866, SAN YSIDRO, CA 92143-2866
PO BOX 432867, SAN YSIDRO, CA 92143-2867
PO BOX 432868, SAN YSIDRO, CA 92143-2868
PO BOX 432869, SAN YSIDRO, CA 92143-2869
PO BOX 432870, SAN YSIDRO, CA 92143-2870
PO BOX 432871, SAN YSIDRO, CA 92143-2871
PO BOX 432872, SAN YSIDRO, CA 92143-2872
PO BOX 432873, SAN YSIDRO, CA 92143-2873
PO BOX 432874, SAN YSIDRO, CA 92143-2874
PO BOX 432875, SAN YSIDRO, CA 92143-2875
PO BOX 432876, SAN YSIDRO, CA 92143-2876
PO BOX 432877, SAN YSIDRO, CA 92143-2877
PO BOX 432878, SAN YSIDRO, CA 92143-2878
PO BOX 432879, SAN YSIDRO, CA 92143-2879
PO BOX 432880, SAN YSIDRO, CA 92143-2880
PO BOX 432881, SAN YSIDRO, CA 92143-2881
PO BOX 432882, SAN YSIDRO, CA 92143-2882
PO BOX 432883, SAN YSIDRO, CA 92143-2883
PO BOX 432884, SAN YSIDRO, CA 92143-2884
PO BOX 432885, SAN YSIDRO, CA 92143-2885
PO BOX 432886, SAN YSIDRO, CA 92143-2886
PO BOX 432887, SAN YSIDRO, CA 92143-2887
PO BOX 432888, SAN YSIDRO, CA 92143-2888
PO BOX 432889, SAN YSIDRO, CA 92143-2889
PO BOX 432890, SAN YSIDRO, CA 92143-2890
PO BOX 432891, SAN YSIDRO, CA 92143-2891
PO BOX 432892, SAN YSIDRO, CA 92143-2892
PO BOX 432893, SAN YSIDRO, CA 92143-2893
PO BOX 432894, SAN YSIDRO, CA 92143-2894
PO BOX 432895, SAN YSIDRO, CA 92143-2895
PO BOX 432896, SAN YSIDRO, CA 92143-2896
PO BOX 432897, SAN YSIDRO, CA 92143-2897
PO BOX 432898, SAN YSIDRO, CA 92143-2898
PO BOX 432899, SAN YSIDRO, CA 92143-2899
PO BOX 432900, SAN YSIDRO, CA 92143-2900
PO BOX 432901, SAN YSIDRO, CA 92143-2901
PO BOX 432902, SAN YSIDRO, CA 92143-2902
PO BOX 432903, SAN YSIDRO, CA 92143-2903
PO BOX 432904, SAN YSIDRO, CA 92143-2904
PO BOX 432905, SAN YSIDRO, CA 92143-2905
PO BOX 432906, SAN YSIDRO, CA 92143-2906
PO BOX 432907, SAN YSIDRO, CA 92143-2907
PO BOX 432908, SAN YSIDRO, CA 92143-2908
PO BOX 432909, SAN YSIDRO, CA 92143-2909
PO BOX 432910, SAN YSIDRO, CA 92143-2910
PO BOX 432911, SAN YSIDRO, CA 92143-2911
PO BOX 432912, SAN YSIDRO, CA 92143-2912
PO BOX 432913, SAN YSIDRO, CA 92143-2913
PO BOX 432914, SAN YSIDRO, CA 92143-2914
PO BOX 432915, SAN YSIDRO, CA 92143-2915
PO BOX 432916, SAN YSIDRO, CA 92143-2916
PO BOX 432917, SAN YSIDRO, CA 92143-2917
PO BOX 432918, SAN YSIDRO, CA 92143-2918
PO BOX 432919, SAN YSIDRO, CA 92143-2919
PO BOX 432920, SAN YSIDRO, CA 92143-2920
PO BOX 432921, SAN YSIDRO, CA 92143-2921
PO BOX 432922, SAN YSIDRO, CA 92143-2922
PO BOX 432923, SAN YSIDRO, CA 92143-2923
PO BOX 432924, SAN YSIDRO, CA 92143-2924
PO BOX 432925, SAN YSIDRO, CA 92143-2925
PO BOX 432926, SAN YSIDRO, CA 92143-2926
PO BOX 432927, SAN YSIDRO, CA 92143-2927
PO BOX 432928, SAN YSIDRO, CA 92143-2928
PO BOX 432929, SAN YSIDRO, CA 92143-2929
PO BOX 432930, SAN YSIDRO, CA 92143-2930
PO BOX 432931, SAN YSIDRO, CA 92143-2931
PO BOX 432932, SAN YSIDRO, CA 92143-2932
PO BOX 432933, SAN YSIDRO, CA 92143-2933
PO BOX 432934, SAN YSIDRO, CA 92143-2934
PO BOX 432935, SAN YSIDRO, CA 92143-2935
PO BOX 432936, SAN YSIDRO, CA 92143-2936
PO BOX 432937, SAN YSIDRO, CA 92143-2937
PO BOX 432938, SAN YSIDRO, CA 92143-2938
PO BOX 432939, SAN YSIDRO, CA 92143-2939
PO BOX 432940, SAN YSIDRO, CA 92143-2940
PO BOX 432941, SAN YSIDRO, CA 92143-2941
PO BOX 432942, SAN YSIDRO, CA 92143-2942
PO BOX 432943, SAN YSIDRO, CA 92143-2943
PO BOX 432944, SAN YSIDRO, CA 92143-2944
PO BOX 432945, SAN YSIDRO, CA 92143-2945
PO BOX 432946, SAN YSIDRO, CA 92143-2946
PO BOX 432947, SAN YSIDRO, CA 92143-2947
PO BOX 432948, SAN YSIDRO, CA 92143-2948
PO BOX 432949, SAN YSIDRO, CA 92143-2949
PO BOX 432950, SAN YSIDRO, CA 92143-2950
PO BOX 432951, SAN YSIDRO, CA 92143-2951
PO BOX 432952, SAN YSIDRO, CA 92143-2952
PO BOX 432953, SAN YSIDRO, CA 92143-2953
PO BOX 432954, SAN YSIDRO, CA 92143-2954
PO BOX 432955, SAN YSIDRO, CA 92143-2955
PO BOX 432956, SAN YSIDRO, CA 92143-2956
PO BOX 432957, SAN YSIDRO, CA 92143-2957
PO BOX 432958, SAN YSIDRO, CA 92143-2958
PO BOX 432959, SAN YSIDRO, CA 92143-2959
PO BOX 432960, SAN YSIDRO, CA 92143-2960
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