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 671, CLEAR LAKE, SD 57226-0671
PO BOX 672, CLEAR LAKE, SD 57226-0672
PO BOX 673, CLEAR LAKE, SD 57226-0673
PO BOX 674, CLEAR LAKE, SD 57226-0674
PO BOX 675, CLEAR LAKE, SD 57226-0675
PO BOX 676, CLEAR LAKE, SD 57226-0676
PO BOX 677, CLEAR LAKE, SD 57226-0677
PO BOX 678, CLEAR LAKE, SD 57226-0678
PO BOX 679, CLEAR LAKE, SD 57226-0679
PO BOX 680, CLEAR LAKE, SD 57226-0680
PO BOX 681, CLEAR LAKE, SD 57226-0681
PO BOX 682, CLEAR LAKE, SD 57226-0682
PO BOX 683, CLEAR LAKE, SD 57226-0683
PO BOX 684, CLEAR LAKE, SD 57226-0684
PO BOX 685, CLEAR LAKE, SD 57226-0685
PO BOX 686, CLEAR LAKE, SD 57226-0686
PO BOX 687, CLEAR LAKE, SD 57226-0687
PO BOX 688, CLEAR LAKE, SD 57226-0688
PO BOX 689, CLEAR LAKE, SD 57226-0689
PO BOX 690, CLEAR LAKE, SD 57226-0690
PO BOX 691, CLEAR LAKE, SD 57226-0691
PO BOX 692, CLEAR LAKE, SD 57226-0692
PO BOX 693, CLEAR LAKE, SD 57226-0693
PO BOX 694, CLEAR LAKE, SD 57226-0694
PO BOX 695, CLEAR LAKE, SD 57226-0695
PO BOX 696, CLEAR LAKE, SD 57226-0696
PO BOX 697, CLEAR LAKE, SD 57226-0697
PO BOX 698, CLEAR LAKE, SD 57226-0698
PO BOX 699, CLEAR LAKE, SD 57226-0699
PO BOX 700, CLEAR LAKE, SD 57226-0700
PO BOX 701, CLEAR LAKE, SD 57226-0701
PO BOX 702, CLEAR LAKE, SD 57226-0702
PO BOX 703, CLEAR LAKE, SD 57226-0703
PO BOX 704, CLEAR LAKE, SD 57226-0704
PO BOX 705, CLEAR LAKE, SD 57226-0705
PO BOX 706, CLEAR LAKE, SD 57226-0706
PO BOX 707, CLEAR LAKE, SD 57226-0707
PO BOX 708, CLEAR LAKE, SD 57226-0708
PO BOX 709, CLEAR LAKE, SD 57226-0709
PO BOX 710, CLEAR LAKE, SD 57226-0710
PO BOX 711, CLEAR LAKE, SD 57226-0711
PO BOX 712, CLEAR LAKE, SD 57226-0712
PO BOX 713, CLEAR LAKE, SD 57226-0713
PO BOX 714, CLEAR LAKE, SD 57226-0714
PO BOX 715, CLEAR LAKE, SD 57226-0715
PO BOX 716, CLEAR LAKE, SD 57226-0716
PO BOX 717, CLEAR LAKE, SD 57226-0717
PO BOX 718, CLEAR LAKE, SD 57226-0718
PO BOX 719, CLEAR LAKE, SD 57226-0719
PO BOX 720, CLEAR LAKE, SD 57226-0720
PO BOX 721, CLEAR LAKE, SD 57226-0721
PO BOX 722, CLEAR LAKE, SD 57226-0722
PO BOX 723, CLEAR LAKE, SD 57226-0723
PO BOX 724, CLEAR LAKE, SD 57226-0724
PO BOX 725, CLEAR LAKE, SD 57226-0725
PO BOX 726, CLEAR LAKE, SD 57226-0726
PO BOX 727, CLEAR LAKE, SD 57226-0727
PO BOX 728, CLEAR LAKE, SD 57226-0728
PO BOX 729, CLEAR LAKE, SD 57226-0729
PO BOX 730, CLEAR LAKE, SD 57226-0730
PO BOX 731, CLEAR LAKE, SD 57226-0731
PO BOX 732, CLEAR LAKE, SD 57226-0732
PO BOX 733, CLEAR LAKE, SD 57226-0733
PO BOX 734, CLEAR LAKE, SD 57226-0734
PO BOX 735, CLEAR LAKE, SD 57226-0735
PO BOX 736, CLEAR LAKE, SD 57226-0736
PO BOX 737, CLEAR LAKE, SD 57226-0737
PO BOX 738, CLEAR LAKE, SD 57226-0738
PO BOX 739, CLEAR LAKE, SD 57226-0739
PO BOX 740, CLEAR LAKE, SD 57226-0740
PO BOX 741, CLEAR LAKE, SD 57226-0741
PO BOX 742, CLEAR LAKE, SD 57226-0742
PO BOX 743, CLEAR LAKE, SD 57226-0743
PO BOX 744, CLEAR LAKE, SD 57226-0744
PO BOX 745, CLEAR LAKE, SD 57226-0745
PO BOX 746, CLEAR LAKE, SD 57226-0746
PO BOX 747, CLEAR LAKE, SD 57226-0747
PO BOX 748, CLEAR LAKE, SD 57226-0748
PO BOX 749, CLEAR LAKE, SD 57226-0749
PO BOX 750, CLEAR LAKE, SD 57226-0750
PO BOX 751, CLEAR LAKE, SD 57226-0751
PO BOX 752, CLEAR LAKE, SD 57226-0752
PO BOX 753, CLEAR LAKE, SD 57226-0753
PO BOX 754, CLEAR LAKE, SD 57226-0754
PO BOX 755, CLEAR LAKE, SD 57226-0755
PO BOX 756, CLEAR LAKE, SD 57226-0756
PO BOX 757, CLEAR LAKE, SD 57226-0757
PO BOX 758, CLEAR LAKE, SD 57226-0758
PO BOX 759, CLEAR LAKE, SD 57226-0759
PO BOX 760, CLEAR LAKE, SD 57226-0760
PO BOX 761, CLEAR LAKE, SD 57226-0761
PO BOX 762, CLEAR LAKE, SD 57226-0762
PO BOX 763, CLEAR LAKE, SD 57226-0763
PO BOX 764, CLEAR LAKE, SD 57226-0764
PO BOX 765, CLEAR LAKE, SD 57226-0765
PO BOX 766, CLEAR LAKE, SD 57226-0766
PO BOX 767, CLEAR LAKE, SD 57226-0767
PO BOX 768, CLEAR LAKE, SD 57226-0768
PO BOX 769, CLEAR LAKE, SD 57226-0769
PO BOX 770, CLEAR LAKE, SD 57226-0770
PO BOX 771, CLEAR LAKE, SD 57226-0771
PO BOX 772, CLEAR LAKE, SD 57226-0772
PO BOX 773, CLEAR LAKE, SD 57226-0773
PO BOX 774, CLEAR LAKE, SD 57226-0774
PO BOX 775, CLEAR LAKE, SD 57226-0775
PO BOX 776, CLEAR LAKE, SD 57226-0776
PO BOX 777, CLEAR LAKE, SD 57226-0777
PO BOX 778, CLEAR LAKE, SD 57226-0778
PO BOX 779, CLEAR LAKE, SD 57226-0779
PO BOX 780, CLEAR LAKE, SD 57226-0780
PO BOX 781, CLEAR LAKE, SD 57226-0781
PO BOX 782, CLEAR LAKE, SD 57226-0782
PO BOX 783, CLEAR LAKE, SD 57226-0783
PO BOX 784, CLEAR LAKE, SD 57226-0784
PO BOX 785, CLEAR LAKE, SD 57226-0785
PO BOX 786, CLEAR LAKE, SD 57226-0786
PO BOX 787, CLEAR LAKE, SD 57226-0787
PO BOX 788, CLEAR LAKE, SD 57226-0788
PO BOX 789, CLEAR LAKE, SD 57226-0789
PO BOX 790, CLEAR LAKE, SD 57226-0790
PO BOX 791, CLEAR LAKE, SD 57226-0791
PO BOX 792, CLEAR LAKE, SD 57226-0792
PO BOX 793, CLEAR LAKE, SD 57226-0793
PO BOX 794, CLEAR LAKE, SD 57226-0794
PO BOX 795, CLEAR LAKE, SD 57226-0795
PO BOX 796, CLEAR LAKE, SD 57226-0796
PO BOX 797, CLEAR LAKE, SD 57226-0797
PO BOX 798, CLEAR LAKE, SD 57226-0798
PO BOX 799, CLEAR LAKE, SD 57226-0799
PO BOX 800, CLEAR LAKE, SD 57226-0800
PO BOX 801, CLEAR LAKE, SD 57226-0801
PO BOX 802, CLEAR LAKE, SD 57226-0802
PO BOX 803, CLEAR LAKE, SD 57226-0803
PO BOX 804, CLEAR LAKE, SD 57226-0804
PO BOX 805, CLEAR LAKE, SD 57226-0805
PO BOX 806, CLEAR LAKE, SD 57226-0806
PO BOX 807, CLEAR LAKE, SD 57226-0807
PO BOX 808, CLEAR LAKE, SD 57226-0808
PO BOX 809, CLEAR LAKE, SD 57226-0809
PO BOX 810, CLEAR LAKE, SD 57226-0810
PO BOX 811, CLEAR LAKE, SD 57226-0811
PO BOX 812, CLEAR LAKE, SD 57226-0812
PO BOX 813, CLEAR LAKE, SD 57226-0813
PO BOX 814, CLEAR LAKE, SD 57226-0814
PO BOX 815, CLEAR LAKE, SD 57226-0815
PO BOX 816, CLEAR LAKE, SD 57226-0816
PO BOX 817, CLEAR LAKE, SD 57226-0817
PO BOX 818, CLEAR LAKE, SD 57226-0818
PO BOX 819, CLEAR LAKE, SD 57226-0819
PO BOX 820, CLEAR LAKE, SD 57226-0820
PO BOX 821, CLEAR LAKE, SD 57226-0821
PO BOX 822, CLEAR LAKE, SD 57226-0822
PO BOX 823, CLEAR LAKE, SD 57226-0823
PO BOX 824, CLEAR LAKE, SD 57226-0824
PO BOX 825, CLEAR LAKE, SD 57226-0825
PO BOX 826, CLEAR LAKE, SD 57226-0826
PO BOX 827, CLEAR LAKE, SD 57226-0827
PO BOX 828, CLEAR LAKE, SD 57226-0828
PO BOX 829, CLEAR LAKE, SD 57226-0829
PO BOX 830, CLEAR LAKE, SD 57226-0830
PO BOX 831, CLEAR LAKE, SD 57226-0831
PO BOX 832, CLEAR LAKE, SD 57226-0832
PO BOX 833, CLEAR LAKE, SD 57226-0833
PO BOX 834, CLEAR LAKE, SD 57226-0834
PO BOX 835, CLEAR LAKE, SD 57226-0835
PO BOX 836, CLEAR LAKE, SD 57226-0836
PO BOX 837, CLEAR LAKE, SD 57226-0837
PO BOX 838, CLEAR LAKE, SD 57226-0838
PO BOX 839, CLEAR LAKE, SD 57226-0839
PO BOX 840, CLEAR LAKE, SD 57226-0840
PO BOX 841, CLEAR LAKE, SD 57226-0841
PO BOX 842, CLEAR LAKE, SD 57226-0842
PO BOX 843, CLEAR LAKE, SD 57226-0843
PO BOX 844, CLEAR LAKE, SD 57226-0844
PO BOX 845, CLEAR LAKE, SD 57226-0845
PO BOX 846, CLEAR LAKE, SD 57226-0846
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