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, FORT MILL, SC 29716-0661
PO BOX 662, FORT MILL, SC 29716-0662
PO BOX 663, FORT MILL, SC 29716-0663
PO BOX 664, FORT MILL, SC 29716-0664
PO BOX 665, FORT MILL, SC 29716-0665
PO BOX 666, FORT MILL, SC 29716-0666
PO BOX 667, FORT MILL, SC 29716-0667
PO BOX 668, FORT MILL, SC 29716-0668
PO BOX 669, FORT MILL, SC 29716-0669
PO BOX 670, FORT MILL, SC 29716-0670
PO BOX 671, FORT MILL, SC 29716-0671
PO BOX 672, FORT MILL, SC 29716-0672
PO BOX 673, FORT MILL, SC 29716-0673
PO BOX 674, FORT MILL, SC 29716-0674
PO BOX 675, FORT MILL, SC 29716-0675
PO BOX 676, FORT MILL, SC 29716-0676
PO BOX 677, FORT MILL, SC 29716-0677
PO BOX 678, FORT MILL, SC 29716-0678
PO BOX 679, FORT MILL, SC 29716-0679
PO BOX 680, FORT MILL, SC 29716-0680
PO BOX 681, FORT MILL, SC 29716-0681
PO BOX 682, FORT MILL, SC 29716-0682
PO BOX 683, FORT MILL, SC 29716-0683
PO BOX 684, FORT MILL, SC 29716-0684
PO BOX 685, FORT MILL, SC 29716-0685
PO BOX 686, FORT MILL, SC 29716-0686
PO BOX 687, FORT MILL, SC 29716-0687
PO BOX 688, FORT MILL, SC 29716-0688
PO BOX 689, FORT MILL, SC 29716-0689
PO BOX 690, FORT MILL, SC 29716-0690
PO BOX 691, FORT MILL, SC 29716-0691
PO BOX 692, FORT MILL, SC 29716-0692
PO BOX 693, FORT MILL, SC 29716-0693
PO BOX 694, FORT MILL, SC 29716-0694
PO BOX 695, FORT MILL, SC 29716-0695
PO BOX 696, FORT MILL, SC 29716-0696
PO BOX 697, FORT MILL, SC 29716-0697
PO BOX 698, FORT MILL, SC 29716-0698
PO BOX 699, FORT MILL, SC 29716-0699
PO BOX 700, FORT MILL, SC 29716-0700
PO BOX 701, FORT MILL, SC 29716-0701
PO BOX 702, FORT MILL, SC 29716-0702
PO BOX 703, FORT MILL, SC 29716-0703
PO BOX 704, FORT MILL, SC 29716-0704
PO BOX 705, FORT MILL, SC 29716-0705
PO BOX 706, FORT MILL, SC 29716-0706
PO BOX 707, FORT MILL, SC 29716-0707
PO BOX 708, FORT MILL, SC 29716-0708
PO BOX 709, FORT MILL, SC 29716-0709
PO BOX 710, FORT MILL, SC 29716-0710
PO BOX 711, FORT MILL, SC 29716-0711
PO BOX 712, FORT MILL, SC 29716-0712
PO BOX 713, FORT MILL, SC 29716-0713
PO BOX 714, FORT MILL, SC 29716-0714
PO BOX 715, FORT MILL, SC 29716-0715
PO BOX 716, FORT MILL, SC 29716-0716
PO BOX 717, FORT MILL, SC 29716-0717
PO BOX 718, FORT MILL, SC 29716-0718
PO BOX 719, FORT MILL, SC 29716-0719
PO BOX 720, FORT MILL, SC 29716-0720
PO BOX 721, FORT MILL, SC 29716-0721
PO BOX 722, FORT MILL, SC 29716-0722
PO BOX 723, FORT MILL, SC 29716-0723
PO BOX 724, FORT MILL, SC 29716-0724
PO BOX 725, FORT MILL, SC 29716-0725
PO BOX 726, FORT MILL, SC 29716-0726
PO BOX 727, FORT MILL, SC 29716-0727
PO BOX 728, FORT MILL, SC 29716-0728
PO BOX 729, FORT MILL, SC 29716-0729
PO BOX 730, FORT MILL, SC 29716-0730
PO BOX 731, FORT MILL, SC 29716-0731
PO BOX 732, FORT MILL, SC 29716-0732
PO BOX 733, FORT MILL, SC 29716-0733
PO BOX 734, FORT MILL, SC 29716-0734
PO BOX 735, FORT MILL, SC 29716-0735
PO BOX 736, FORT MILL, SC 29716-0736
PO BOX 737, FORT MILL, SC 29716-0737
PO BOX 738, FORT MILL, SC 29716-0738
PO BOX 739, FORT MILL, SC 29716-0739
PO BOX 740, FORT MILL, SC 29716-0740
PO BOX 741, FORT MILL, SC 29716-0741
PO BOX 742, FORT MILL, SC 29716-0742
PO BOX 743, FORT MILL, SC 29716-0743
PO BOX 744, FORT MILL, SC 29716-0744
PO BOX 745, FORT MILL, SC 29716-0745
PO BOX 746, FORT MILL, SC 29716-0746
PO BOX 747, FORT MILL, SC 29716-0747
PO BOX 748, FORT MILL, SC 29716-0748
PO BOX 749, FORT MILL, SC 29716-0749
PO BOX 750, FORT MILL, SC 29716-0750
PO BOX 751, FORT MILL, SC 29716-0751
PO BOX 752, FORT MILL, SC 29716-0752
PO BOX 753, FORT MILL, SC 29716-0753
PO BOX 754, FORT MILL, SC 29716-0754
PO BOX 755, FORT MILL, SC 29716-0755
PO BOX 756, FORT MILL, SC 29716-0756
PO BOX 757, FORT MILL, SC 29716-0757
PO BOX 758, FORT MILL, SC 29716-0758
PO BOX 759, FORT MILL, SC 29716-0759
PO BOX 760, FORT MILL, SC 29716-0760
PO BOX 761, FORT MILL, SC 29716-0761
PO BOX 762, FORT MILL, SC 29716-0762
PO BOX 763, FORT MILL, SC 29716-0763
PO BOX 764, FORT MILL, SC 29716-0764
PO BOX 765, FORT MILL, SC 29716-0765
PO BOX 766, FORT MILL, SC 29716-0766
PO BOX 767, FORT MILL, SC 29716-0767
PO BOX 768, FORT MILL, SC 29716-0768
PO BOX 769, FORT MILL, SC 29716-0769
PO BOX 770, FORT MILL, SC 29716-0770
PO BOX 771, FORT MILL, SC 29716-0771
PO BOX 772, FORT MILL, SC 29716-0772
PO BOX 773, FORT MILL, SC 29716-0773
PO BOX 774, FORT MILL, SC 29716-0774
PO BOX 775, FORT MILL, SC 29716-0775
PO BOX 776, FORT MILL, SC 29716-0776
PO BOX 777, FORT MILL, SC 29716-0777
PO BOX 778, FORT MILL, SC 29716-0778
PO BOX 779, FORT MILL, SC 29716-0779
PO BOX 780, FORT MILL, SC 29716-0780
PO BOX 781, FORT MILL, SC 29716-0781
PO BOX 782, FORT MILL, SC 29716-0782
PO BOX 783, FORT MILL, SC 29716-0783
PO BOX 784, FORT MILL, SC 29716-0784
PO BOX 785, FORT MILL, SC 29716-0785
PO BOX 786, FORT MILL, SC 29716-0786
PO BOX 787, FORT MILL, SC 29716-0787
PO BOX 788, FORT MILL, SC 29716-0788
PO BOX 789, FORT MILL, SC 29716-0789
PO BOX 790, FORT MILL, SC 29716-0790
PO BOX 791, FORT MILL, SC 29716-0791
PO BOX 792, FORT MILL, SC 29716-0792
PO BOX 793, FORT MILL, SC 29716-0793
PO BOX 794, FORT MILL, SC 29716-0794
PO BOX 795, FORT MILL, SC 29716-0795
PO BOX 796, FORT MILL, SC 29716-0796
PO BOX 797, FORT MILL, SC 29716-0797
PO BOX 798, FORT MILL, SC 29716-0798
PO BOX 799, FORT MILL, SC 29716-0799
PO BOX 800, FORT MILL, SC 29716-0800
PO BOX 801, FORT MILL, SC 29716-0801
PO BOX 802, FORT MILL, SC 29716-0802
PO BOX 803, FORT MILL, SC 29716-0803
PO BOX 804, FORT MILL, SC 29716-0804
PO BOX 805, FORT MILL, SC 29716-0805
PO BOX 806, FORT MILL, SC 29716-0806
PO BOX 807, FORT MILL, SC 29716-0807
PO BOX 808, FORT MILL, SC 29716-0808
PO BOX 809, FORT MILL, SC 29716-0809
PO BOX 810, FORT MILL, SC 29716-0810
PO BOX 811, FORT MILL, SC 29716-0811
PO BOX 812, FORT MILL, SC 29716-0812
PO BOX 813, FORT MILL, SC 29716-0813
PO BOX 814, FORT MILL, SC 29716-0814
PO BOX 815, FORT MILL, SC 29716-0815
PO BOX 816, FORT MILL, SC 29716-0816
PO BOX 817, FORT MILL, SC 29716-0817
PO BOX 818, FORT MILL, SC 29716-0818
PO BOX 819, FORT MILL, SC 29716-0819
PO BOX 820, FORT MILL, SC 29716-0820
PO BOX 821, FORT MILL, SC 29716-0821
PO BOX 822, FORT MILL, SC 29716-0822
PO BOX 823, FORT MILL, SC 29716-0823
PO BOX 824, FORT MILL, SC 29716-0824
PO BOX 825, FORT MILL, SC 29716-0825
PO BOX 826, FORT MILL, SC 29716-0826
PO BOX 827, FORT MILL, SC 29716-0827
PO BOX 828, FORT MILL, SC 29716-0828
PO BOX 829, FORT MILL, SC 29716-0829
PO BOX 830, FORT MILL, SC 29716-0830
PO BOX 831, FORT MILL, SC 29716-0831
PO BOX 832, FORT MILL, SC 29716-0832
PO BOX 833, FORT MILL, SC 29716-0833
PO BOX 834, FORT MILL, SC 29716-0834
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