Číslo PO BOXU může být menší nebo více než čtyřmístné. U poštovních schránek obecně platí, že každá schránka má svůj vlastní kód ZIP + 4.
Poslední čtyři číslice jsou často jednou z následujících možností:
1. Nula plus poslední tři číslice čísla krabice (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. Poslední čtyři číslice čísla rámečku (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. Pokud je číslo rámečku menší než čtyři číslice, před nulou čísla rámečku se předloží dostatek nul, aby vzniklo čtyřmístné číslo(eg. PO BOX 1, Shreveport LA 71161-0001).
Neexistuje však jednotné pravidlo, poštovní směrovací číslo plus čtyři slouží pouze pro informaci, poštovní směrovací číslo ZIP + 4 musí být vyhledáno jednotlivě pro každé políčko na oficiálním webu USPS.
PO BOX 761, SOUTH PLAINFIELD, NJ 07080-0761
PO BOX 762, SOUTH PLAINFIELD, NJ 07080-0762
PO BOX 763, SOUTH PLAINFIELD, NJ 07080-0763
PO BOX 764, SOUTH PLAINFIELD, NJ 07080-0764
PO BOX 765, SOUTH PLAINFIELD, NJ 07080-0765
PO BOX 766, SOUTH PLAINFIELD, NJ 07080-0766
PO BOX 767, SOUTH PLAINFIELD, NJ 07080-0767
PO BOX 768, SOUTH PLAINFIELD, NJ 07080-0768
PO BOX 769, SOUTH PLAINFIELD, NJ 07080-0769
PO BOX 770, SOUTH PLAINFIELD, NJ 07080-0770
PO BOX 771, SOUTH PLAINFIELD, NJ 07080-0771
PO BOX 772, SOUTH PLAINFIELD, NJ 07080-0772
PO BOX 773, SOUTH PLAINFIELD, NJ 07080-0773
PO BOX 774, SOUTH PLAINFIELD, NJ 07080-0774
PO BOX 775, SOUTH PLAINFIELD, NJ 07080-0775
PO BOX 776, SOUTH PLAINFIELD, NJ 07080-0776
PO BOX 777, SOUTH PLAINFIELD, NJ 07080-0777
PO BOX 778, SOUTH PLAINFIELD, NJ 07080-0778
PO BOX 779, SOUTH PLAINFIELD, NJ 07080-0779
PO BOX 780, SOUTH PLAINFIELD, NJ 07080-0780
PO BOX 781, SOUTH PLAINFIELD, NJ 07080-0781
PO BOX 782, SOUTH PLAINFIELD, NJ 07080-0782
PO BOX 783, SOUTH PLAINFIELD, NJ 07080-0783
PO BOX 784, SOUTH PLAINFIELD, NJ 07080-0784
PO BOX 785, SOUTH PLAINFIELD, NJ 07080-0785
PO BOX 786, SOUTH PLAINFIELD, NJ 07080-0786
PO BOX 787, SOUTH PLAINFIELD, NJ 07080-0787
PO BOX 788, SOUTH PLAINFIELD, NJ 07080-0788
PO BOX 789, SOUTH PLAINFIELD, NJ 07080-0789
PO BOX 790, SOUTH PLAINFIELD, NJ 07080-0790
PO BOX 791, SOUTH PLAINFIELD, NJ 07080-0791
PO BOX 792, SOUTH PLAINFIELD, NJ 07080-0792
PO BOX 793, SOUTH PLAINFIELD, NJ 07080-0793
PO BOX 794, SOUTH PLAINFIELD, NJ 07080-0794
PO BOX 795, SOUTH PLAINFIELD, NJ 07080-0795
PO BOX 796, SOUTH PLAINFIELD, NJ 07080-0796
PO BOX 797, SOUTH PLAINFIELD, NJ 07080-0797
PO BOX 798, SOUTH PLAINFIELD, NJ 07080-0798
PO BOX 799, SOUTH PLAINFIELD, NJ 07080-0799
PO BOX 800, SOUTH PLAINFIELD, NJ 07080-0800
PO BOX 801, SOUTH PLAINFIELD, NJ 07080-0801
PO BOX 802, SOUTH PLAINFIELD, NJ 07080-0802
PO BOX 803, SOUTH PLAINFIELD, NJ 07080-0803
PO BOX 804, SOUTH PLAINFIELD, NJ 07080-0804
PO BOX 805, SOUTH PLAINFIELD, NJ 07080-0805
PO BOX 806, SOUTH PLAINFIELD, NJ 07080-0806
PO BOX 807, SOUTH PLAINFIELD, NJ 07080-0807
PO BOX 808, SOUTH PLAINFIELD, NJ 07080-0808
PO BOX 809, SOUTH PLAINFIELD, NJ 07080-0809
PO BOX 810, SOUTH PLAINFIELD, NJ 07080-0810
PO BOX 811, SOUTH PLAINFIELD, NJ 07080-0811
PO BOX 812, SOUTH PLAINFIELD, NJ 07080-0812
PO BOX 813, SOUTH PLAINFIELD, NJ 07080-0813
PO BOX 814, SOUTH PLAINFIELD, NJ 07080-0814
PO BOX 815, SOUTH PLAINFIELD, NJ 07080-0815
PO BOX 816, SOUTH PLAINFIELD, NJ 07080-0816
PO BOX 817, SOUTH PLAINFIELD, NJ 07080-0817
PO BOX 818, SOUTH PLAINFIELD, NJ 07080-0818
PO BOX 819, SOUTH PLAINFIELD, NJ 07080-0819
PO BOX 820, SOUTH PLAINFIELD, NJ 07080-0820
PO BOX 821, SOUTH PLAINFIELD, NJ 07080-0821
PO BOX 822, SOUTH PLAINFIELD, NJ 07080-0822
PO BOX 823, SOUTH PLAINFIELD, NJ 07080-0823
PO BOX 824, SOUTH PLAINFIELD, NJ 07080-0824
PO BOX 825, SOUTH PLAINFIELD, NJ 07080-0825
PO BOX 826, SOUTH PLAINFIELD, NJ 07080-0826
PO BOX 827, SOUTH PLAINFIELD, NJ 07080-0827
PO BOX 828, SOUTH PLAINFIELD, NJ 07080-0828
PO BOX 829, SOUTH PLAINFIELD, NJ 07080-0829
PO BOX 830, SOUTH PLAINFIELD, NJ 07080-0830
PO BOX 831, SOUTH PLAINFIELD, NJ 07080-0831
PO BOX 832, SOUTH PLAINFIELD, NJ 07080-0832
PO BOX 833, SOUTH PLAINFIELD, NJ 07080-0833
PO BOX 834, SOUTH PLAINFIELD, NJ 07080-0834
PO BOX 835, SOUTH PLAINFIELD, NJ 07080-0835
PO BOX 836, SOUTH PLAINFIELD, NJ 07080-0836
PO BOX 837, SOUTH PLAINFIELD, NJ 07080-0837
PO BOX 838, SOUTH PLAINFIELD, NJ 07080-0838
PO BOX 839, SOUTH PLAINFIELD, NJ 07080-0839
PO BOX 840, SOUTH PLAINFIELD, NJ 07080-0840
PO BOX 841, SOUTH PLAINFIELD, NJ 07080-0841
PO BOX 842, SOUTH PLAINFIELD, NJ 07080-0842
PO BOX 843, SOUTH PLAINFIELD, NJ 07080-0843
PO BOX 844, SOUTH PLAINFIELD, NJ 07080-0844
PO BOX 845, SOUTH PLAINFIELD, NJ 07080-0845
PO BOX 846, SOUTH PLAINFIELD, NJ 07080-0846
PO BOX 847, SOUTH PLAINFIELD, NJ 07080-0847
PO BOX 848, SOUTH PLAINFIELD, NJ 07080-0848
PO BOX 849, SOUTH PLAINFIELD, NJ 07080-0849
PO BOX 850, SOUTH PLAINFIELD, NJ 07080-0850
PO BOX 851, SOUTH PLAINFIELD, NJ 07080-0851
PO BOX 852, SOUTH PLAINFIELD, NJ 07080-0852
PO BOX 853, SOUTH PLAINFIELD, NJ 07080-0853
PO BOX 854, SOUTH PLAINFIELD, NJ 07080-0854
PO BOX 855, SOUTH PLAINFIELD, NJ 07080-0855
PO BOX 856, SOUTH PLAINFIELD, NJ 07080-0856
PO BOX 857, SOUTH PLAINFIELD, NJ 07080-0857
PO BOX 858, SOUTH PLAINFIELD, NJ 07080-0858
PO BOX 859, SOUTH PLAINFIELD, NJ 07080-0859
PO BOX 860, SOUTH PLAINFIELD, NJ 07080-0860
PO BOX 861, SOUTH PLAINFIELD, NJ 07080-0861
PO BOX 862, SOUTH PLAINFIELD, NJ 07080-0862
PO BOX 863, SOUTH PLAINFIELD, NJ 07080-0863
PO BOX 864, SOUTH PLAINFIELD, NJ 07080-0864
PO BOX 865, SOUTH PLAINFIELD, NJ 07080-0865
PO BOX 866, SOUTH PLAINFIELD, NJ 07080-0866
PO BOX 867, SOUTH PLAINFIELD, NJ 07080-0867
PO BOX 868, SOUTH PLAINFIELD, NJ 07080-0868
PO BOX 869, SOUTH PLAINFIELD, NJ 07080-0869
PO BOX 870, SOUTH PLAINFIELD, NJ 07080-0870
PO BOX 871, SOUTH PLAINFIELD, NJ 07080-0871
PO BOX 872, SOUTH PLAINFIELD, NJ 07080-0872
PO BOX 873, SOUTH PLAINFIELD, NJ 07080-0873
PO BOX 874, SOUTH PLAINFIELD, NJ 07080-0874
PO BOX 875, SOUTH PLAINFIELD, NJ 07080-0875
PO BOX 876, SOUTH PLAINFIELD, NJ 07080-0876
PO BOX 877, SOUTH PLAINFIELD, NJ 07080-0877
PO BOX 878, SOUTH PLAINFIELD, NJ 07080-0878
PO BOX 879, SOUTH PLAINFIELD, NJ 07080-0879
PO BOX 880, SOUTH PLAINFIELD, NJ 07080-0880
PO BOX 881, SOUTH PLAINFIELD, NJ 07080-0881
PO BOX 882, SOUTH PLAINFIELD, NJ 07080-0882
PO BOX 883, SOUTH PLAINFIELD, NJ 07080-0883
PO BOX 884, SOUTH PLAINFIELD, NJ 07080-0884
PO BOX 885, SOUTH PLAINFIELD, NJ 07080-0885
PO BOX 886, SOUTH PLAINFIELD, NJ 07080-0886
PO BOX 887, SOUTH PLAINFIELD, NJ 07080-0887
PO BOX 888, SOUTH PLAINFIELD, NJ 07080-0888
PO BOX 889, SOUTH PLAINFIELD, NJ 07080-0889
PO BOX 890, SOUTH PLAINFIELD, NJ 07080-0890
PO BOX 891, SOUTH PLAINFIELD, NJ 07080-0891
PO BOX 892, SOUTH PLAINFIELD, NJ 07080-0892
PO BOX 893, SOUTH PLAINFIELD, NJ 07080-0893
PO BOX 894, SOUTH PLAINFIELD, NJ 07080-0894
PO BOX 895, SOUTH PLAINFIELD, NJ 07080-0895
PO BOX 896, SOUTH PLAINFIELD, NJ 07080-0896
PO BOX 897, SOUTH PLAINFIELD, NJ 07080-0897
PO BOX 898, SOUTH PLAINFIELD, NJ 07080-0898
PO BOX 899, SOUTH PLAINFIELD, NJ 07080-0899
PO BOX 900, SOUTH PLAINFIELD, NJ 07080-0900
PO BOX 901, SOUTH PLAINFIELD, NJ 07080-0901
PO BOX 902, SOUTH PLAINFIELD, NJ 07080-0902
PO BOX 903, SOUTH PLAINFIELD, NJ 07080-0903
PO BOX 904, SOUTH PLAINFIELD, NJ 07080-0904
PO BOX 905, SOUTH PLAINFIELD, NJ 07080-0905
PO BOX 906, SOUTH PLAINFIELD, NJ 07080-0906
PO BOX 907, SOUTH PLAINFIELD, NJ 07080-0907
PO BOX 908, SOUTH PLAINFIELD, NJ 07080-0908
PO BOX 909, SOUTH PLAINFIELD, NJ 07080-0909
PO BOX 910, SOUTH PLAINFIELD, NJ 07080-0910
PO BOX 911, SOUTH PLAINFIELD, NJ 07080-0911
PO BOX 912, SOUTH PLAINFIELD, NJ 07080-0912
PO BOX 913, SOUTH PLAINFIELD, NJ 07080-0913
PO BOX 914, SOUTH PLAINFIELD, NJ 07080-0914
PO BOX 915, SOUTH PLAINFIELD, NJ 07080-0915
PO BOX 916, SOUTH PLAINFIELD, NJ 07080-0916
PO BOX 917, SOUTH PLAINFIELD, NJ 07080-0917
PO BOX 918, SOUTH PLAINFIELD, NJ 07080-0918
PO BOX 919, SOUTH PLAINFIELD, NJ 07080-0919
PO BOX 920, SOUTH PLAINFIELD, NJ 07080-0920
PO BOX 921, SOUTH PLAINFIELD, NJ 07080-0921
PO BOX 922, SOUTH PLAINFIELD, NJ 07080-0922
PO BOX 923, SOUTH PLAINFIELD, NJ 07080-0923
PO BOX 924, SOUTH PLAINFIELD, NJ 07080-0924
PO BOX 925, SOUTH PLAINFIELD, NJ 07080-0925
PO BOX 926, SOUTH PLAINFIELD, NJ 07080-0926
PO BOX 927, SOUTH PLAINFIELD, NJ 07080-0927
PO BOX 928, SOUTH PLAINFIELD, NJ 07080-0928
PO BOX 929, SOUTH PLAINFIELD, NJ 07080-0929
PO BOX 930, SOUTH PLAINFIELD, NJ 07080-0930
PO BOX 931, SOUTH PLAINFIELD, NJ 07080-0931
PO BOX 932, SOUTH PLAINFIELD, NJ 07080-0932
PO BOX 933, SOUTH PLAINFIELD, NJ 07080-0933
PO BOX 934, SOUTH PLAINFIELD, NJ 07080-0934
PO BOX 935, SOUTH PLAINFIELD, NJ 07080-0935
PO BOX 936, SOUTH PLAINFIELD, NJ 07080-0936
PO BOX 937, SOUTH PLAINFIELD, NJ 07080-0937
PO BOX 938, SOUTH PLAINFIELD, NJ 07080-0938
PO BOX 939, SOUTH PLAINFIELD, NJ 07080-0939
PO BOX 940, SOUTH PLAINFIELD, NJ 07080-0940
PO BOX 941, SOUTH PLAINFIELD, NJ 07080-0941
PO BOX 942, SOUTH PLAINFIELD, NJ 07080-0942
PO BOX 943, SOUTH PLAINFIELD, NJ 07080-0943
PO BOX 944, SOUTH PLAINFIELD, NJ 07080-0944
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