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 781, WEST PALM BEACH, FL 33402-0781
PO BOX 782, WEST PALM BEACH, FL 33402-0782
PO BOX 783, WEST PALM BEACH, FL 33402-0783
PO BOX 784, WEST PALM BEACH, FL 33402-0784
PO BOX 785, WEST PALM BEACH, FL 33402-0785
PO BOX 786, WEST PALM BEACH, FL 33402-0786
PO BOX 787, WEST PALM BEACH, FL 33402-0787
PO BOX 788, WEST PALM BEACH, FL 33402-0788
PO BOX 789, WEST PALM BEACH, FL 33402-0789
PO BOX 790, WEST PALM BEACH, FL 33402-0790
PO BOX 791, WEST PALM BEACH, FL 33402-0791
PO BOX 792, WEST PALM BEACH, FL 33402-0792
PO BOX 793, WEST PALM BEACH, FL 33402-0793
PO BOX 794, WEST PALM BEACH, FL 33402-0794
PO BOX 795, WEST PALM BEACH, FL 33402-0795
PO BOX 796, WEST PALM BEACH, FL 33402-0796
PO BOX 797, WEST PALM BEACH, FL 33402-0797
PO BOX 798, WEST PALM BEACH, FL 33402-0798
PO BOX 799, WEST PALM BEACH, FL 33402-0799
PO BOX 800, WEST PALM BEACH, FL 33402-0800
PO BOX 801, WEST PALM BEACH, FL 33402-0801
PO BOX 802, WEST PALM BEACH, FL 33402-0802
PO BOX 803, WEST PALM BEACH, FL 33402-0803
PO BOX 804, WEST PALM BEACH, FL 33402-0804
PO BOX 805, WEST PALM BEACH, FL 33402-0805
PO BOX 806, WEST PALM BEACH, FL 33402-0806
PO BOX 807, WEST PALM BEACH, FL 33402-0807
PO BOX 808, WEST PALM BEACH, FL 33402-0808
PO BOX 809, WEST PALM BEACH, FL 33402-0809
PO BOX 810, WEST PALM BEACH, FL 33402-0810
PO BOX 811, WEST PALM BEACH, FL 33402-0811
PO BOX 812, WEST PALM BEACH, FL 33402-0812
PO BOX 813, WEST PALM BEACH, FL 33402-0813
PO BOX 814, WEST PALM BEACH, FL 33402-0814
PO BOX 815, WEST PALM BEACH, FL 33402-0815
PO BOX 816, WEST PALM BEACH, FL 33402-0816
PO BOX 817, WEST PALM BEACH, FL 33402-0817
PO BOX 818, WEST PALM BEACH, FL 33402-0818
PO BOX 819, WEST PALM BEACH, FL 33402-0819
PO BOX 820, WEST PALM BEACH, FL 33402-0820
PO BOX 821, WEST PALM BEACH, FL 33402-0821
PO BOX 822, WEST PALM BEACH, FL 33402-0822
PO BOX 823, WEST PALM BEACH, FL 33402-0823
PO BOX 824, WEST PALM BEACH, FL 33402-0824
PO BOX 825, WEST PALM BEACH, FL 33402-0825
PO BOX 826, WEST PALM BEACH, FL 33402-0826
PO BOX 827, WEST PALM BEACH, FL 33402-0827
PO BOX 828, WEST PALM BEACH, FL 33402-0828
PO BOX 829, WEST PALM BEACH, FL 33402-0829
PO BOX 830, WEST PALM BEACH, FL 33402-0830
PO BOX 831, WEST PALM BEACH, FL 33402-0831
PO BOX 832, WEST PALM BEACH, FL 33402-0832
PO BOX 833, WEST PALM BEACH, FL 33402-0833
PO BOX 834, WEST PALM BEACH, FL 33402-0834
PO BOX 835, WEST PALM BEACH, FL 33402-0835
PO BOX 836, WEST PALM BEACH, FL 33402-0836
PO BOX 837, WEST PALM BEACH, FL 33402-0837
PO BOX 838, WEST PALM BEACH, FL 33402-0838
PO BOX 839, WEST PALM BEACH, FL 33402-0839
PO BOX 840, WEST PALM BEACH, FL 33402-0840
PO BOX 841, WEST PALM BEACH, FL 33402-0841
PO BOX 842, WEST PALM BEACH, FL 33402-0842
PO BOX 843, WEST PALM BEACH, FL 33402-0843
PO BOX 844, WEST PALM BEACH, FL 33402-0844
PO BOX 845, WEST PALM BEACH, FL 33402-0845
PO BOX 846, WEST PALM BEACH, FL 33402-0846
PO BOX 847, WEST PALM BEACH, FL 33402-0847
PO BOX 848, WEST PALM BEACH, FL 33402-0848
PO BOX 849, WEST PALM BEACH, FL 33402-0849
PO BOX 850, WEST PALM BEACH, FL 33402-0850
PO BOX 851, WEST PALM BEACH, FL 33402-0851
PO BOX 852, WEST PALM BEACH, FL 33402-0852
PO BOX 853, WEST PALM BEACH, FL 33402-0853
PO BOX 854, WEST PALM BEACH, FL 33402-0854
PO BOX 855, WEST PALM BEACH, FL 33402-0855
PO BOX 856, WEST PALM BEACH, FL 33402-0856
PO BOX 857, WEST PALM BEACH, FL 33402-0857
PO BOX 858, WEST PALM BEACH, FL 33402-0858
PO BOX 859, WEST PALM BEACH, FL 33402-0859
PO BOX 860, WEST PALM BEACH, FL 33402-0860
PO BOX 861, WEST PALM BEACH, FL 33402-0861
PO BOX 862, WEST PALM BEACH, FL 33402-0862
PO BOX 863, WEST PALM BEACH, FL 33402-0863
PO BOX 864, WEST PALM BEACH, FL 33402-0864
PO BOX 865, WEST PALM BEACH, FL 33402-0865
PO BOX 866, WEST PALM BEACH, FL 33402-0866
PO BOX 867, WEST PALM BEACH, FL 33402-0867
PO BOX 868, WEST PALM BEACH, FL 33402-0868
PO BOX 869, WEST PALM BEACH, FL 33402-0869
PO BOX 870, WEST PALM BEACH, FL 33402-0870
PO BOX 871, WEST PALM BEACH, FL 33402-0871
PO BOX 872, WEST PALM BEACH, FL 33402-0872
PO BOX 873, WEST PALM BEACH, FL 33402-0873
PO BOX 874, WEST PALM BEACH, FL 33402-0874
PO BOX 875, WEST PALM BEACH, FL 33402-0875
PO BOX 876, WEST PALM BEACH, FL 33402-0876
PO BOX 877, WEST PALM BEACH, FL 33402-0877
PO BOX 878, WEST PALM BEACH, FL 33402-0878
PO BOX 879, WEST PALM BEACH, FL 33402-0879
PO BOX 880, WEST PALM BEACH, FL 33402-0880
PO BOX 881, WEST PALM BEACH, FL 33402-0881
PO BOX 882, WEST PALM BEACH, FL 33402-0882
PO BOX 883, WEST PALM BEACH, FL 33402-0883
PO BOX 884, WEST PALM BEACH, FL 33402-0884
PO BOX 885, WEST PALM BEACH, FL 33402-0885
PO BOX 886, WEST PALM BEACH, FL 33402-0886
PO BOX 887, WEST PALM BEACH, FL 33402-0887
PO BOX 888, WEST PALM BEACH, FL 33402-0888
PO BOX 889, WEST PALM BEACH, FL 33402-0889
PO BOX 890, WEST PALM BEACH, FL 33402-0890
PO BOX 891, WEST PALM BEACH, FL 33402-0891
PO BOX 892, WEST PALM BEACH, FL 33402-0892
PO BOX 893, WEST PALM BEACH, FL 33402-0893
PO BOX 894, WEST PALM BEACH, FL 33402-0894
PO BOX 895, WEST PALM BEACH, FL 33402-0895
PO BOX 896, WEST PALM BEACH, FL 33402-0896
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