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 721, SPEARFISH, SD 57783-0721
PO BOX 722, SPEARFISH, SD 57783-0722
PO BOX 723, SPEARFISH, SD 57783-0723
PO BOX 724, SPEARFISH, SD 57783-0724
PO BOX 725, SPEARFISH, SD 57783-0725
PO BOX 726, SPEARFISH, SD 57783-0726
PO BOX 727, SPEARFISH, SD 57783-0727
PO BOX 728, SPEARFISH, SD 57783-0728
PO BOX 729, SPEARFISH, SD 57783-0729
PO BOX 730, SPEARFISH, SD 57783-0730
PO BOX 731, SPEARFISH, SD 57783-0731
PO BOX 732, SPEARFISH, SD 57783-0732
PO BOX 733, SPEARFISH, SD 57783-0733
PO BOX 734, SPEARFISH, SD 57783-0734
PO BOX 735, SPEARFISH, SD 57783-0735
PO BOX 736, SPEARFISH, SD 57783-0736
PO BOX 737, SPEARFISH, SD 57783-0737
PO BOX 738, SPEARFISH, SD 57783-0738
PO BOX 739, SPEARFISH, SD 57783-0739
PO BOX 740, SPEARFISH, SD 57783-0740
PO BOX 741, SPEARFISH, SD 57783-0741
PO BOX 742, SPEARFISH, SD 57783-0742
PO BOX 743, SPEARFISH, SD 57783-0743
PO BOX 744, SPEARFISH, SD 57783-0744
PO BOX 745, SPEARFISH, SD 57783-0745
PO BOX 746, SPEARFISH, SD 57783-0746
PO BOX 747, SPEARFISH, SD 57783-0747
PO BOX 748, SPEARFISH, SD 57783-0748
PO BOX 749, SPEARFISH, SD 57783-0749
PO BOX 750, SPEARFISH, SD 57783-0750
PO BOX 751, SPEARFISH, SD 57783-0751
PO BOX 752, SPEARFISH, SD 57783-0752
PO BOX 753, SPEARFISH, SD 57783-0753
PO BOX 754, SPEARFISH, SD 57783-0754
PO BOX 755, SPEARFISH, SD 57783-0755
PO BOX 756, SPEARFISH, SD 57783-0756
PO BOX 757, SPEARFISH, SD 57783-0757
PO BOX 758, SPEARFISH, SD 57783-0758
PO BOX 759, SPEARFISH, SD 57783-0759
PO BOX 760, SPEARFISH, SD 57783-0760
PO BOX 761, SPEARFISH, SD 57783-0761
PO BOX 762, SPEARFISH, SD 57783-0762
PO BOX 763, SPEARFISH, SD 57783-0763
PO BOX 764, SPEARFISH, SD 57783-0764
PO BOX 765, SPEARFISH, SD 57783-0765
PO BOX 766, SPEARFISH, SD 57783-0766
PO BOX 767, SPEARFISH, SD 57783-0767
PO BOX 768, SPEARFISH, SD 57783-0768
PO BOX 769, SPEARFISH, SD 57783-0769
PO BOX 770, SPEARFISH, SD 57783-0770
PO BOX 771, SPEARFISH, SD 57783-0771
PO BOX 772, SPEARFISH, SD 57783-0772
PO BOX 773, SPEARFISH, SD 57783-0773
PO BOX 774, SPEARFISH, SD 57783-0774
PO BOX 775, SPEARFISH, SD 57783-0775
PO BOX 776, SPEARFISH, SD 57783-0776
PO BOX 777, SPEARFISH, SD 57783-0777
PO BOX 778, SPEARFISH, SD 57783-0778
PO BOX 779, SPEARFISH, SD 57783-0779
PO BOX 780, SPEARFISH, SD 57783-0780
PO BOX 781, SPEARFISH, SD 57783-0781
PO BOX 782, SPEARFISH, SD 57783-0782
PO BOX 783, SPEARFISH, SD 57783-0783
PO BOX 784, SPEARFISH, SD 57783-0784
PO BOX 785, SPEARFISH, SD 57783-0785
PO BOX 786, SPEARFISH, SD 57783-0786
PO BOX 787, SPEARFISH, SD 57783-0787
PO BOX 788, SPEARFISH, SD 57783-0788
PO BOX 789, SPEARFISH, SD 57783-0789
PO BOX 790, SPEARFISH, SD 57783-0790
PO BOX 791, SPEARFISH, SD 57783-0791
PO BOX 792, SPEARFISH, SD 57783-0792
PO BOX 793, SPEARFISH, SD 57783-0793
PO BOX 794, SPEARFISH, SD 57783-0794
PO BOX 795, SPEARFISH, SD 57783-0795
PO BOX 796, SPEARFISH, SD 57783-0796
PO BOX 797, SPEARFISH, SD 57783-0797
PO BOX 798, SPEARFISH, SD 57783-0798
PO BOX 799, SPEARFISH, SD 57783-0799
PO BOX 800, SPEARFISH, SD 57783-0800
PO BOX 801, SPEARFISH, SD 57783-0801
PO BOX 802, SPEARFISH, SD 57783-0802
PO BOX 803, SPEARFISH, SD 57783-0803
PO BOX 804, SPEARFISH, SD 57783-0804
PO BOX 805, SPEARFISH, SD 57783-0805
PO BOX 806, SPEARFISH, SD 57783-0806
PO BOX 807, SPEARFISH, SD 57783-0807
PO BOX 808, SPEARFISH, SD 57783-0808
PO BOX 809, SPEARFISH, SD 57783-0809
PO BOX 810, SPEARFISH, SD 57783-0810
PO BOX 811, SPEARFISH, SD 57783-0811
PO BOX 812, SPEARFISH, SD 57783-0812
PO BOX 813, SPEARFISH, SD 57783-0813
PO BOX 814, SPEARFISH, SD 57783-0814
PO BOX 815, SPEARFISH, SD 57783-0815
PO BOX 816, SPEARFISH, SD 57783-0816
PO BOX 817, SPEARFISH, SD 57783-0817
PO BOX 818, SPEARFISH, SD 57783-0818
PO BOX 819, SPEARFISH, SD 57783-0819
PO BOX 820, SPEARFISH, SD 57783-0820
PO BOX 821, SPEARFISH, SD 57783-0821
PO BOX 822, SPEARFISH, SD 57783-0822
PO BOX 823, SPEARFISH, SD 57783-0823
PO BOX 824, SPEARFISH, SD 57783-0824
PO BOX 825, SPEARFISH, SD 57783-0825
PO BOX 826, SPEARFISH, SD 57783-0826
PO BOX 827, SPEARFISH, SD 57783-0827
PO BOX 828, SPEARFISH, SD 57783-0828
PO BOX 829, SPEARFISH, SD 57783-0829
PO BOX 830, SPEARFISH, SD 57783-0830
PO BOX 831, SPEARFISH, SD 57783-0831
PO BOX 832, SPEARFISH, SD 57783-0832
PO BOX 833, SPEARFISH, SD 57783-0833
PO BOX 834, SPEARFISH, SD 57783-0834
PO BOX 835, SPEARFISH, SD 57783-0835
PO BOX 836, SPEARFISH, SD 57783-0836
PO BOX 837, SPEARFISH, SD 57783-0837
PO BOX 838, SPEARFISH, SD 57783-0838
PO BOX 839, SPEARFISH, SD 57783-0839
PO BOX 840, SPEARFISH, SD 57783-0840
PO BOX 841, SPEARFISH, SD 57783-0841
PO BOX 842, SPEARFISH, SD 57783-0842
PO BOX 843, SPEARFISH, SD 57783-0843
PO BOX 844, SPEARFISH, SD 57783-0844
PO BOX 845, SPEARFISH, SD 57783-0845
PO BOX 846, SPEARFISH, SD 57783-0846
PO BOX 847, SPEARFISH, SD 57783-0847
PO BOX 848, SPEARFISH, SD 57783-0848
PO BOX 849, SPEARFISH, SD 57783-0849
PO BOX 850, SPEARFISH, SD 57783-0850
PO BOX 851, SPEARFISH, SD 57783-0851
PO BOX 852, SPEARFISH, SD 57783-0852
PO BOX 853, SPEARFISH, SD 57783-0853
PO BOX 854, SPEARFISH, SD 57783-0854
PO BOX 855, SPEARFISH, SD 57783-0855
PO BOX 856, SPEARFISH, SD 57783-0856
PO BOX 857, SPEARFISH, SD 57783-0857
PO BOX 858, SPEARFISH, SD 57783-0858
PO BOX 859, SPEARFISH, SD 57783-0859
PO BOX 860, SPEARFISH, SD 57783-0860
PO BOX 861, SPEARFISH, SD 57783-0861
PO BOX 862, SPEARFISH, SD 57783-0862
PO BOX 863, SPEARFISH, SD 57783-0863
PO BOX 864, SPEARFISH, SD 57783-0864
PO BOX 865, SPEARFISH, SD 57783-0865
PO BOX 866, SPEARFISH, SD 57783-0866
PO BOX 867, SPEARFISH, SD 57783-0867
PO BOX 868, SPEARFISH, SD 57783-0868
PO BOX 869, SPEARFISH, SD 57783-0869
PO BOX 870, SPEARFISH, SD 57783-0870
PO BOX 871, SPEARFISH, SD 57783-0871
PO BOX 872, SPEARFISH, SD 57783-0872
PO BOX 873, SPEARFISH, SD 57783-0873
PO BOX 874, SPEARFISH, SD 57783-0874
PO BOX 875, SPEARFISH, SD 57783-0875
PO BOX 876, SPEARFISH, SD 57783-0876
PO BOX 877, SPEARFISH, SD 57783-0877
PO BOX 878, SPEARFISH, SD 57783-0878
PO BOX 879, SPEARFISH, SD 57783-0879
PO BOX 880, SPEARFISH, SD 57783-0880
PO BOX 881, SPEARFISH, SD 57783-0881
PO BOX 882, SPEARFISH, SD 57783-0882
PO BOX 883, SPEARFISH, SD 57783-0883
PO BOX 884, SPEARFISH, SD 57783-0884
PO BOX 885, SPEARFISH, SD 57783-0885
PO BOX 886, SPEARFISH, SD 57783-0886
PO BOX 887, SPEARFISH, SD 57783-0887
PO BOX 888, SPEARFISH, SD 57783-0888
PO BOX 889, SPEARFISH, SD 57783-0889
PO BOX 890, SPEARFISH, SD 57783-0890
PO BOX 891, SPEARFISH, SD 57783-0891
PO BOX 892, SPEARFISH, SD 57783-0892
PO BOX 893, SPEARFISH, SD 57783-0893
PO BOX 894, SPEARFISH, SD 57783-0894
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