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 632, BISHOPVILLE, SC 29010-0632
PO BOX 633, BISHOPVILLE, SC 29010-0633
PO BOX 634, BISHOPVILLE, SC 29010-0634
PO BOX 635, BISHOPVILLE, SC 29010-0635
PO BOX 636, BISHOPVILLE, SC 29010-0636
PO BOX 637, BISHOPVILLE, SC 29010-0637
PO BOX 638, BISHOPVILLE, SC 29010-0638
PO BOX 639, BISHOPVILLE, SC 29010-0639
PO BOX 640, BISHOPVILLE, SC 29010-0640
PO BOX 641, BISHOPVILLE, SC 29010-0641
PO BOX 642, BISHOPVILLE, SC 29010-0642
PO BOX 643, BISHOPVILLE, SC 29010-0643
PO BOX 644, BISHOPVILLE, SC 29010-0644
PO BOX 645, BISHOPVILLE, SC 29010-0645
PO BOX 646, BISHOPVILLE, SC 29010-0646
PO BOX 647, BISHOPVILLE, SC 29010-0647
PO BOX 648, BISHOPVILLE, SC 29010-0648
PO BOX 649, BISHOPVILLE, SC 29010-0649
PO BOX 650, BISHOPVILLE, SC 29010-0650
PO BOX 651, BISHOPVILLE, SC 29010-0651
PO BOX 652, BISHOPVILLE, SC 29010-0652
PO BOX 653, BISHOPVILLE, SC 29010-0653
PO BOX 654, BISHOPVILLE, SC 29010-0654
PO BOX 655, BISHOPVILLE, SC 29010-0655
PO BOX 656, BISHOPVILLE, SC 29010-0656
PO BOX 657, BISHOPVILLE, SC 29010-0657
PO BOX 658, BISHOPVILLE, SC 29010-0658
PO BOX 659, BISHOPVILLE, SC 29010-0659
PO BOX 660, BISHOPVILLE, SC 29010-0660
PO BOX 661, BISHOPVILLE, SC 29010-0661
PO BOX 662, BISHOPVILLE, SC 29010-0662
PO BOX 663, BISHOPVILLE, SC 29010-0663
PO BOX 664, BISHOPVILLE, SC 29010-0664
PO BOX 665, BISHOPVILLE, SC 29010-0665
PO BOX 666, BISHOPVILLE, SC 29010-0666
PO BOX 667, BISHOPVILLE, SC 29010-0667
PO BOX 668, BISHOPVILLE, SC 29010-0668
PO BOX 669, BISHOPVILLE, SC 29010-0669
PO BOX 670, BISHOPVILLE, SC 29010-0670
PO BOX 671, BISHOPVILLE, SC 29010-0671
PO BOX 672, BISHOPVILLE, SC 29010-0672
PO BOX 673, BISHOPVILLE, SC 29010-0673
PO BOX 674, BISHOPVILLE, SC 29010-0674
PO BOX 675, BISHOPVILLE, SC 29010-0675
PO BOX 676, BISHOPVILLE, SC 29010-0676
PO BOX 677, BISHOPVILLE, SC 29010-0677
PO BOX 678, BISHOPVILLE, SC 29010-0678
PO BOX 679, BISHOPVILLE, SC 29010-0679
PO BOX 680, BISHOPVILLE, SC 29010-0680
PO BOX 681, BISHOPVILLE, SC 29010-0681
PO BOX 682, BISHOPVILLE, SC 29010-0682
PO BOX 683, BISHOPVILLE, SC 29010-0683
PO BOX 684, BISHOPVILLE, SC 29010-0684
PO BOX 685, BISHOPVILLE, SC 29010-0685
PO BOX 686, BISHOPVILLE, SC 29010-0686
PO BOX 687, BISHOPVILLE, SC 29010-0687
PO BOX 688, BISHOPVILLE, SC 29010-0688
PO BOX 689, BISHOPVILLE, SC 29010-0689
PO BOX 690, BISHOPVILLE, SC 29010-0690
PO BOX 691, BISHOPVILLE, SC 29010-0691
PO BOX 692, BISHOPVILLE, SC 29010-0692
PO BOX 693, BISHOPVILLE, SC 29010-0693
PO BOX 694, BISHOPVILLE, SC 29010-0694
PO BOX 695, BISHOPVILLE, SC 29010-0695
PO BOX 696, BISHOPVILLE, SC 29010-0696
PO BOX 697, BISHOPVILLE, SC 29010-0697
PO BOX 698, BISHOPVILLE, SC 29010-0698
PO BOX 699, BISHOPVILLE, SC 29010-0699
PO BOX 700, BISHOPVILLE, SC 29010-0700
PO BOX 701, BISHOPVILLE, SC 29010-0701
PO BOX 702, BISHOPVILLE, SC 29010-0702
PO BOX 703, BISHOPVILLE, SC 29010-0703
PO BOX 704, BISHOPVILLE, SC 29010-0704
PO BOX 705, BISHOPVILLE, SC 29010-0705
PO BOX 706, BISHOPVILLE, SC 29010-0706
PO BOX 707, BISHOPVILLE, SC 29010-0707
PO BOX 708, BISHOPVILLE, SC 29010-0708
PO BOX 709, BISHOPVILLE, SC 29010-0709
PO BOX 710, BISHOPVILLE, SC 29010-0710
PO BOX 711, BISHOPVILLE, SC 29010-0711
PO BOX 712, BISHOPVILLE, SC 29010-0712
PO BOX 713, BISHOPVILLE, SC 29010-0713
PO BOX 714, BISHOPVILLE, SC 29010-0714
PO BOX 715, BISHOPVILLE, SC 29010-0715
PO BOX 716, BISHOPVILLE, SC 29010-0716
PO BOX 717, BISHOPVILLE, SC 29010-0717
PO BOX 718, BISHOPVILLE, SC 29010-0718
PO BOX 719, BISHOPVILLE, SC 29010-0719
PO BOX 720, BISHOPVILLE, SC 29010-0720
PO BOX 721, BISHOPVILLE, SC 29010-0721
PO BOX 722, BISHOPVILLE, SC 29010-0722
PO BOX 723, BISHOPVILLE, SC 29010-0723
PO BOX 724, BISHOPVILLE, SC 29010-0724
PO BOX 725, BISHOPVILLE, SC 29010-0725
PO BOX 726, BISHOPVILLE, SC 29010-0726
PO BOX 727, BISHOPVILLE, SC 29010-0727
PO BOX 728, BISHOPVILLE, SC 29010-0728
PO BOX 729, BISHOPVILLE, SC 29010-0729
PO BOX 730, BISHOPVILLE, SC 29010-0730
PO BOX 731, BISHOPVILLE, SC 29010-0731
PO BOX 732, BISHOPVILLE, SC 29010-0732
PO BOX 733, BISHOPVILLE, SC 29010-0733
PO BOX 734, BISHOPVILLE, SC 29010-0734
PO BOX 735, BISHOPVILLE, SC 29010-0735
PO BOX 736, BISHOPVILLE, SC 29010-0736
PO BOX 737, BISHOPVILLE, SC 29010-0737
PO BOX 738, BISHOPVILLE, SC 29010-0738
PO BOX 739, BISHOPVILLE, SC 29010-0739
PO BOX 740, BISHOPVILLE, SC 29010-0740
PO BOX 741, BISHOPVILLE, SC 29010-0741
PO BOX 742, BISHOPVILLE, SC 29010-0742
PO BOX 743, BISHOPVILLE, SC 29010-0743
PO BOX 744, BISHOPVILLE, SC 29010-0744
PO BOX 745, BISHOPVILLE, SC 29010-0745
PO BOX 746, BISHOPVILLE, SC 29010-0746
PO BOX 747, BISHOPVILLE, SC 29010-0747
PO BOX 748, BISHOPVILLE, SC 29010-0748
PO BOX 749, BISHOPVILLE, SC 29010-0749
PO BOX 750, BISHOPVILLE, SC 29010-0750
PO BOX 751, BISHOPVILLE, SC 29010-0751
PO BOX 752, BISHOPVILLE, SC 29010-0752
PO BOX 753, BISHOPVILLE, SC 29010-0753
PO BOX 754, BISHOPVILLE, SC 29010-0754
PO BOX 755, BISHOPVILLE, SC 29010-0755
PO BOX 756, BISHOPVILLE, SC 29010-0756
PO BOX 757, BISHOPVILLE, SC 29010-0757
PO BOX 758, BISHOPVILLE, SC 29010-0758
PO BOX 759, BISHOPVILLE, SC 29010-0759
PO BOX 760, BISHOPVILLE, SC 29010-0760
PO BOX 761, BISHOPVILLE, SC 29010-0761
PO BOX 762, BISHOPVILLE, SC 29010-0762
PO BOX 763, BISHOPVILLE, SC 29010-0763
PO BOX 764, BISHOPVILLE, SC 29010-0764
PO BOX 765, BISHOPVILLE, SC 29010-0765
PO BOX 766, BISHOPVILLE, SC 29010-0766
PO BOX 767, BISHOPVILLE, SC 29010-0767
PO BOX 768, BISHOPVILLE, SC 29010-0768
PO BOX 769, BISHOPVILLE, SC 29010-0769
PO BOX 770, BISHOPVILLE, SC 29010-0770
PO BOX 771, BISHOPVILLE, SC 29010-0771
PO BOX 772, BISHOPVILLE, SC 29010-0772
PO BOX 773, BISHOPVILLE, SC 29010-0773
PO BOX 774, BISHOPVILLE, SC 29010-0774
PO BOX 775, BISHOPVILLE, SC 29010-0775
PO BOX 776, BISHOPVILLE, SC 29010-0776
PO BOX 777, BISHOPVILLE, SC 29010-0777
PO BOX 778, BISHOPVILLE, SC 29010-0778
PO BOX 779, BISHOPVILLE, SC 29010-0779
PO BOX 780, BISHOPVILLE, SC 29010-0780
PO BOX 781, BISHOPVILLE, SC 29010-0781
PO BOX 782, BISHOPVILLE, SC 29010-0782
PO BOX 783, BISHOPVILLE, SC 29010-0783
PO BOX 784, BISHOPVILLE, SC 29010-0784
PO BOX 785, BISHOPVILLE, SC 29010-0785
PO BOX 786, BISHOPVILLE, SC 29010-0786
PO BOX 787, BISHOPVILLE, SC 29010-0787
PO BOX 788, BISHOPVILLE, SC 29010-0788
PO BOX 789, BISHOPVILLE, SC 29010-0789
PO BOX 790, BISHOPVILLE, SC 29010-0790
PO BOX 791, BISHOPVILLE, SC 29010-0791
PO BOX 792, BISHOPVILLE, SC 29010-0792
PO BOX 793, BISHOPVILLE, SC 29010-0793
PO BOX 794, BISHOPVILLE, SC 29010-0794
PO BOX 795, BISHOPVILLE, SC 29010-0795
PO BOX 796, BISHOPVILLE, SC 29010-0796
PO BOX 797, BISHOPVILLE, SC 29010-0797
PO BOX 798, BISHOPVILLE, SC 29010-0798
PO BOX 799, BISHOPVILLE, SC 29010-0799
PO BOX 800, BISHOPVILLE, SC 29010-0800
PO BOX 801, BISHOPVILLE, SC 29010-0801
PO BOX 802, BISHOPVILLE, SC 29010-0802
PO BOX 803, BISHOPVILLE, SC 29010-0803
PO BOX 804, BISHOPVILLE, SC 29010-0804
PO BOX 805, BISHOPVILLE, SC 29010-0805
PO BOX 806, BISHOPVILLE, SC 29010-0806
PO BOX 807, BISHOPVILLE, SC 29010-0807
PO BOX 808, BISHOPVILLE, SC 29010-0808
PO BOX 809, BISHOPVILLE, SC 29010-0809
PO BOX 810, BISHOPVILLE, SC 29010-0810
PO BOX 811, BISHOPVILLE, SC 29010-0811
PO BOX 812, BISHOPVILLE, SC 29010-0812
PO BOX 813, BISHOPVILLE, SC 29010-0813
PO BOX 814, BISHOPVILLE, SC 29010-0814
PO BOX 815, BISHOPVILLE, SC 29010-0815
PO BOX 816, BISHOPVILLE, SC 29010-0816
PO BOX 817, BISHOPVILLE, SC 29010-0817
PO BOX 818, BISHOPVILLE, SC 29010-0818
PO BOX 819, BISHOPVILLE, SC 29010-0819
PO BOX 820, BISHOPVILLE, SC 29010-0820
PO BOX 821, BISHOPVILLE, SC 29010-0821
PO BOX 822, BISHOPVILLE, SC 29010-0822
PO BOX 823, BISHOPVILLE, SC 29010-0823
PO BOX 824, BISHOPVILLE, SC 29010-0824
PO BOX 825, BISHOPVILLE, SC 29010-0825
PO BOX 826, BISHOPVILLE, SC 29010-0826
PO BOX 827, BISHOPVILLE, SC 29010-0827
PO BOX 828, BISHOPVILLE, SC 29010-0828
PO BOX 829, BISHOPVILLE, SC 29010-0829
PO BOX 830, BISHOPVILLE, SC 29010-0830
PO BOX 831, BISHOPVILLE, SC 29010-0831
PO BOX 832, BISHOPVILLE, SC 29010-0832