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 661, SOUTH BELOIT, IL 61080-0661
PO BOX 662, SOUTH BELOIT, IL 61080-0662
PO BOX 663, SOUTH BELOIT, IL 61080-0663
PO BOX 664, SOUTH BELOIT, IL 61080-0664
PO BOX 665, SOUTH BELOIT, IL 61080-0665
PO BOX 666, SOUTH BELOIT, IL 61080-0666
PO BOX 667, SOUTH BELOIT, IL 61080-0667
PO BOX 668, SOUTH BELOIT, IL 61080-0668
PO BOX 669, SOUTH BELOIT, IL 61080-0669
PO BOX 670, SOUTH BELOIT, IL 61080-0670
PO BOX 671, SOUTH BELOIT, IL 61080-0671
PO BOX 672, SOUTH BELOIT, IL 61080-0672
PO BOX 673, SOUTH BELOIT, IL 61080-0673
PO BOX 674, SOUTH BELOIT, IL 61080-0674
PO BOX 675, SOUTH BELOIT, IL 61080-0675
PO BOX 676, SOUTH BELOIT, IL 61080-0676
PO BOX 677, SOUTH BELOIT, IL 61080-0677
PO BOX 678, SOUTH BELOIT, IL 61080-0678
PO BOX 679, SOUTH BELOIT, IL 61080-0679
PO BOX 680, SOUTH BELOIT, IL 61080-0680
PO BOX 681, SOUTH BELOIT, IL 61080-0681
PO BOX 682, SOUTH BELOIT, IL 61080-0682
PO BOX 683, SOUTH BELOIT, IL 61080-0683
PO BOX 684, SOUTH BELOIT, IL 61080-0684
PO BOX 685, SOUTH BELOIT, IL 61080-0685
PO BOX 686, SOUTH BELOIT, IL 61080-0686
PO BOX 687, SOUTH BELOIT, IL 61080-0687
PO BOX 688, SOUTH BELOIT, IL 61080-0688
PO BOX 689, SOUTH BELOIT, IL 61080-0689
PO BOX 690, SOUTH BELOIT, IL 61080-0690
PO BOX 691, SOUTH BELOIT, IL 61080-0691
PO BOX 692, SOUTH BELOIT, IL 61080-0692
PO BOX 693, SOUTH BELOIT, IL 61080-0693
PO BOX 694, SOUTH BELOIT, IL 61080-0694
PO BOX 695, SOUTH BELOIT, IL 61080-0695
PO BOX 696, SOUTH BELOIT, IL 61080-0696
PO BOX 697, SOUTH BELOIT, IL 61080-0697
PO BOX 698, SOUTH BELOIT, IL 61080-0698
PO BOX 699, SOUTH BELOIT, IL 61080-0699
PO BOX 700, SOUTH BELOIT, IL 61080-0700
PO BOX 701, SOUTH BELOIT, IL 61080-0701
PO BOX 702, SOUTH BELOIT, IL 61080-0702
PO BOX 703, SOUTH BELOIT, IL 61080-0703
PO BOX 704, SOUTH BELOIT, IL 61080-0704
PO BOX 705, SOUTH BELOIT, IL 61080-0705
PO BOX 706, SOUTH BELOIT, IL 61080-0706
PO BOX 707, SOUTH BELOIT, IL 61080-0707
PO BOX 708, SOUTH BELOIT, IL 61080-0708
PO BOX 709, SOUTH BELOIT, IL 61080-0709
PO BOX 710, SOUTH BELOIT, IL 61080-0710
PO BOX 711, SOUTH BELOIT, IL 61080-0711
PO BOX 712, SOUTH BELOIT, IL 61080-0712
PO BOX 713, SOUTH BELOIT, IL 61080-0713
PO BOX 714, SOUTH BELOIT, IL 61080-0714
PO BOX 715, SOUTH BELOIT, IL 61080-0715
PO BOX 716, SOUTH BELOIT, IL 61080-0716
PO BOX 717, SOUTH BELOIT, IL 61080-0717
PO BOX 718, SOUTH BELOIT, IL 61080-0718
PO BOX 719, SOUTH BELOIT, IL 61080-0719
PO BOX 720, SOUTH BELOIT, IL 61080-0720
PO BOX 721, SOUTH BELOIT, IL 61080-0721
PO BOX 722, SOUTH BELOIT, IL 61080-0722
PO BOX 723, SOUTH BELOIT, IL 61080-0723
PO BOX 724, SOUTH BELOIT, IL 61080-0724
PO BOX 725, SOUTH BELOIT, IL 61080-0725
PO BOX 726, SOUTH BELOIT, IL 61080-0726
PO BOX 727, SOUTH BELOIT, IL 61080-0727
PO BOX 728, SOUTH BELOIT, IL 61080-0728
PO BOX 729, SOUTH BELOIT, IL 61080-0729
PO BOX 730, SOUTH BELOIT, IL 61080-0730
PO BOX 731, SOUTH BELOIT, IL 61080-0731
PO BOX 732, SOUTH BELOIT, IL 61080-0732
PO BOX 733, SOUTH BELOIT, IL 61080-0733
PO BOX 734, SOUTH BELOIT, IL 61080-0734
PO BOX 735, SOUTH BELOIT, IL 61080-0735
PO BOX 736, SOUTH BELOIT, IL 61080-0736
PO BOX 737, SOUTH BELOIT, IL 61080-0737
PO BOX 738, SOUTH BELOIT, IL 61080-0738
PO BOX 739, SOUTH BELOIT, IL 61080-0739
PO BOX 740, SOUTH BELOIT, IL 61080-0740
PO BOX 741, SOUTH BELOIT, IL 61080-0741
PO BOX 742, SOUTH BELOIT, IL 61080-0742
PO BOX 743, SOUTH BELOIT, IL 61080-0743
PO BOX 744, SOUTH BELOIT, IL 61080-0744
PO BOX 745, SOUTH BELOIT, IL 61080-0745
PO BOX 746, SOUTH BELOIT, IL 61080-0746
PO BOX 747, SOUTH BELOIT, IL 61080-0747
PO BOX 748, SOUTH BELOIT, IL 61080-0748
PO BOX 749, SOUTH BELOIT, IL 61080-0749
PO BOX 750, SOUTH BELOIT, IL 61080-0750
PO BOX 751, SOUTH BELOIT, IL 61080-0751
PO BOX 752, SOUTH BELOIT, IL 61080-0752
PO BOX 753, SOUTH BELOIT, IL 61080-0753
PO BOX 754, SOUTH BELOIT, IL 61080-0754
PO BOX 755, SOUTH BELOIT, IL 61080-0755
PO BOX 756, SOUTH BELOIT, IL 61080-0756
PO BOX 757, SOUTH BELOIT, IL 61080-0757
PO BOX 758, SOUTH BELOIT, IL 61080-0758
PO BOX 759, SOUTH BELOIT, IL 61080-0759
PO BOX 760, SOUTH BELOIT, IL 61080-0760
PO BOX 761, SOUTH BELOIT, IL 61080-0761
PO BOX 762, SOUTH BELOIT, IL 61080-0762
PO BOX 763, SOUTH BELOIT, IL 61080-0763
PO BOX 764, SOUTH BELOIT, IL 61080-0764
PO BOX 765, SOUTH BELOIT, IL 61080-0765
PO BOX 766, SOUTH BELOIT, IL 61080-0766
PO BOX 767, SOUTH BELOIT, IL 61080-0767
PO BOX 768, SOUTH BELOIT, IL 61080-0768
PO BOX 769, SOUTH BELOIT, IL 61080-0769
PO BOX 770, SOUTH BELOIT, IL 61080-0770
PO BOX 771, SOUTH BELOIT, IL 61080-0771
PO BOX 772, SOUTH BELOIT, IL 61080-0772
PO BOX 773, SOUTH BELOIT, IL 61080-0773
PO BOX 774, SOUTH BELOIT, IL 61080-0774
PO BOX 775, SOUTH BELOIT, IL 61080-0775
PO BOX 776, SOUTH BELOIT, IL 61080-0776
PO BOX 777, SOUTH BELOIT, IL 61080-0777
PO BOX 778, SOUTH BELOIT, IL 61080-0778
PO BOX 779, SOUTH BELOIT, IL 61080-0779
PO BOX 780, SOUTH BELOIT, IL 61080-0780
PO BOX 781, SOUTH BELOIT, IL 61080-0781
PO BOX 782, SOUTH BELOIT, IL 61080-0782
PO BOX 783, SOUTH BELOIT, IL 61080-0783
PO BOX 784, SOUTH BELOIT, IL 61080-0784
PO BOX 785, SOUTH BELOIT, IL 61080-0785
PO BOX 786, SOUTH BELOIT, IL 61080-0786
PO BOX 787, SOUTH BELOIT, IL 61080-0787
PO BOX 788, SOUTH BELOIT, IL 61080-0788
PO BOX 789, SOUTH BELOIT, IL 61080-0789
PO BOX 790, SOUTH BELOIT, IL 61080-0790
PO BOX 791, SOUTH BELOIT, IL 61080-0791
PO BOX 792, SOUTH BELOIT, IL 61080-0792
PO BOX 793, SOUTH BELOIT, IL 61080-0793
PO BOX 794, SOUTH BELOIT, IL 61080-0794
PO BOX 795, SOUTH BELOIT, IL 61080-0795
PO BOX 796, SOUTH BELOIT, IL 61080-0796
PO BOX 797, SOUTH BELOIT, IL 61080-0797
PO BOX 798, SOUTH BELOIT, IL 61080-0798
PO BOX 799, SOUTH BELOIT, IL 61080-0799
PO BOX 800, SOUTH BELOIT, IL 61080-0800
PO BOX 801, SOUTH BELOIT, IL 61080-0801
PO BOX 802, SOUTH BELOIT, IL 61080-0802
PO BOX 803, SOUTH BELOIT, IL 61080-0803
PO BOX 804, SOUTH BELOIT, IL 61080-0804
PO BOX 805, SOUTH BELOIT, IL 61080-0805
PO BOX 806, SOUTH BELOIT, IL 61080-0806
PO BOX 807, SOUTH BELOIT, IL 61080-0807
PO BOX 808, SOUTH BELOIT, IL 61080-0808
PO BOX 809, SOUTH BELOIT, IL 61080-0809
PO BOX 810, SOUTH BELOIT, IL 61080-0810
PO BOX 811, SOUTH BELOIT, IL 61080-0811
PO BOX 812, SOUTH BELOIT, IL 61080-0812
PO BOX 813, SOUTH BELOIT, IL 61080-0813
PO BOX 814, SOUTH BELOIT, IL 61080-0814
PO BOX 815, SOUTH BELOIT, IL 61080-0815
PO BOX 816, SOUTH BELOIT, IL 61080-0816
PO BOX 817, SOUTH BELOIT, IL 61080-0817
PO BOX 818, SOUTH BELOIT, IL 61080-0818
PO BOX 819, SOUTH BELOIT, IL 61080-0819
PO BOX 820, SOUTH BELOIT, IL 61080-0820
PO BOX 821, SOUTH BELOIT, IL 61080-0821
PO BOX 822, SOUTH BELOIT, IL 61080-0822
PO BOX 823, SOUTH BELOIT, IL 61080-0823
PO BOX 824, SOUTH BELOIT, IL 61080-0824
PO BOX 825, SOUTH BELOIT, IL 61080-0825
PO BOX 826, SOUTH BELOIT, IL 61080-0826
PO BOX 827, SOUTH BELOIT, IL 61080-0827
PO BOX 828, SOUTH BELOIT, IL 61080-0828
PO BOX 829, SOUTH BELOIT, IL 61080-0829
PO BOX 830, SOUTH BELOIT, IL 61080-0830
PO BOX 831, SOUTH BELOIT, IL 61080-0831
PO BOX 832, SOUTH BELOIT, IL 61080-0832
PO BOX 833, SOUTH BELOIT, IL 61080-0833
PO BOX 834, SOUTH BELOIT, IL 61080-0834
PO BOX 835, SOUTH BELOIT, IL 61080-0835
PO BOX 836, SOUTH BELOIT, IL 61080-0836
PO BOX 837, SOUTH BELOIT, IL 61080-0837
PO BOX 838, SOUTH BELOIT, IL 61080-0838
PO BOX 839, SOUTH BELOIT, IL 61080-0839
PO BOX 840, SOUTH BELOIT, IL 61080-0840
PO BOX 841, SOUTH BELOIT, IL 61080-0841
PO BOX 842, SOUTH BELOIT, IL 61080-0842
PO BOX 843, SOUTH BELOIT, IL 61080-0843
PO BOX 844, SOUTH BELOIT, IL 61080-0844
PO BOX 845, SOUTH BELOIT, IL 61080-0845
PO BOX 846, SOUTH BELOIT, IL 61080-0846
PO BOX 847, SOUTH BELOIT, IL 61080-0847
PO BOX 848, SOUTH BELOIT, IL 61080-0848
PO BOX 849, SOUTH BELOIT, IL 61080-0849
PO BOX 850, SOUTH BELOIT, IL 61080-0850
PO BOX 851, SOUTH BELOIT, IL 61080-0851
PO BOX 852, SOUTH BELOIT, IL 61080-0852
PO BOX 853, SOUTH BELOIT, IL 61080-0853
PO BOX 854, SOUTH BELOIT, IL 61080-0854
PO BOX 855, SOUTH BELOIT, IL 61080-0855
PO BOX 856, SOUTH BELOIT, IL 61080-0856
PO BOX 857, SOUTH BELOIT, IL 61080-0857
PO BOX 858, SOUTH BELOIT, IL 61080-0858
PO BOX 859, SOUTH BELOIT, IL 61080-0859
PO BOX 860, SOUTH BELOIT, IL 61080-0860
PO BOX 861, SOUTH BELOIT, IL 61080-0861
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