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 732, SPENCER, IA 51301-0732
PO BOX 733, SPENCER, IA 51301-0733
PO BOX 734, SPENCER, IA 51301-0734
PO BOX 735, SPENCER, IA 51301-0735
PO BOX 736, SPENCER, IA 51301-0736
PO BOX 737, SPENCER, IA 51301-0737
PO BOX 738, SPENCER, IA 51301-0738
PO BOX 739, SPENCER, IA 51301-0739
PO BOX 740, SPENCER, IA 51301-0740
PO BOX 741, SPENCER, IA 51301-0741
PO BOX 742, SPENCER, IA 51301-0742
PO BOX 743, SPENCER, IA 51301-0743
PO BOX 744, SPENCER, IA 51301-0744
PO BOX 745, SPENCER, IA 51301-0745
PO BOX 746, SPENCER, IA 51301-0746
PO BOX 747, SPENCER, IA 51301-0747
PO BOX 748, SPENCER, IA 51301-0748
PO BOX 749, SPENCER, IA 51301-0749
PO BOX 750, SPENCER, IA 51301-0750
PO BOX 751, SPENCER, IA 51301-0751
PO BOX 752, SPENCER, IA 51301-0752
PO BOX 753, SPENCER, IA 51301-0753
PO BOX 754, SPENCER, IA 51301-0754
PO BOX 755, SPENCER, IA 51301-0755
PO BOX 756, SPENCER, IA 51301-0756
PO BOX 757, SPENCER, IA 51301-0757
PO BOX 758, SPENCER, IA 51301-0758
PO BOX 759, SPENCER, IA 51301-0759
PO BOX 760, SPENCER, IA 51301-0760
PO BOX 761, SPENCER, IA 51301-0761
PO BOX 762, SPENCER, IA 51301-0762
PO BOX 763, SPENCER, IA 51301-0763
PO BOX 764, SPENCER, IA 51301-0764
PO BOX 765, SPENCER, IA 51301-0765
PO BOX 766, SPENCER, IA 51301-0766
PO BOX 767, SPENCER, IA 51301-0767
PO BOX 768, SPENCER, IA 51301-0768
PO BOX 769, SPENCER, IA 51301-0769
PO BOX 770, SPENCER, IA 51301-0770
PO BOX 771, SPENCER, IA 51301-0771
PO BOX 772, SPENCER, IA 51301-0772
PO BOX 773, SPENCER, IA 51301-0773
PO BOX 774, SPENCER, IA 51301-0774
PO BOX 775, SPENCER, IA 51301-0775
PO BOX 776, SPENCER, IA 51301-0776
PO BOX 777, SPENCER, IA 51301-0777
PO BOX 778, SPENCER, IA 51301-0778
PO BOX 779, SPENCER, IA 51301-0779
PO BOX 780, SPENCER, IA 51301-0780
PO BOX 781, SPENCER, IA 51301-0781
PO BOX 782, SPENCER, IA 51301-0782
PO BOX 783, SPENCER, IA 51301-0783
PO BOX 784, SPENCER, IA 51301-0784
PO BOX 785, SPENCER, IA 51301-0785
PO BOX 786, SPENCER, IA 51301-0786
PO BOX 787, SPENCER, IA 51301-0787
PO BOX 788, SPENCER, IA 51301-0788
PO BOX 789, SPENCER, IA 51301-0789
PO BOX 790, SPENCER, IA 51301-0790
PO BOX 791, SPENCER, IA 51301-0791
PO BOX 792, SPENCER, IA 51301-0792
PO BOX 793, SPENCER, IA 51301-0793
PO BOX 794, SPENCER, IA 51301-0794
PO BOX 795, SPENCER, IA 51301-0795
PO BOX 796, SPENCER, IA 51301-0796
PO BOX 797, SPENCER, IA 51301-0797
PO BOX 798, SPENCER, IA 51301-0798
PO BOX 799, SPENCER, IA 51301-0799
PO BOX 800, SPENCER, IA 51301-0800
PO BOX 801, SPENCER, IA 51301-0801
PO BOX 802, SPENCER, IA 51301-0802
PO BOX 803, SPENCER, IA 51301-0803
PO BOX 804, SPENCER, IA 51301-0804
PO BOX 805, SPENCER, IA 51301-0805
PO BOX 806, SPENCER, IA 51301-0806
PO BOX 807, SPENCER, IA 51301-0807
PO BOX 808, SPENCER, IA 51301-0808
PO BOX 809, SPENCER, IA 51301-0809
PO BOX 810, SPENCER, IA 51301-0810
PO BOX 811, SPENCER, IA 51301-0811
PO BOX 812, SPENCER, IA 51301-0812
PO BOX 813, SPENCER, IA 51301-0813
PO BOX 814, SPENCER, IA 51301-0814
PO BOX 815, SPENCER, IA 51301-0815
PO BOX 816, SPENCER, IA 51301-0816
PO BOX 817, SPENCER, IA 51301-0817
PO BOX 818, SPENCER, IA 51301-0818
PO BOX 819, SPENCER, IA 51301-0819
PO BOX 820, SPENCER, IA 51301-0820
PO BOX 821, SPENCER, IA 51301-0821
PO BOX 822, SPENCER, IA 51301-0822
PO BOX 823, SPENCER, IA 51301-0823
PO BOX 824, SPENCER, IA 51301-0824
PO BOX 825, SPENCER, IA 51301-0825
PO BOX 826, SPENCER, IA 51301-0826
PO BOX 827, SPENCER, IA 51301-0827
PO BOX 828, SPENCER, IA 51301-0828
PO BOX 829, SPENCER, IA 51301-0829
PO BOX 830, SPENCER, IA 51301-0830
PO BOX 831, SPENCER, IA 51301-0831
PO BOX 832, SPENCER, IA 51301-0832
PO BOX 833, SPENCER, IA 51301-0833
PO BOX 834, SPENCER, IA 51301-0834
PO BOX 835, SPENCER, IA 51301-0835
PO BOX 836, SPENCER, IA 51301-0836
PO BOX 837, SPENCER, IA 51301-0837
PO BOX 838, SPENCER, IA 51301-0838
PO BOX 839, SPENCER, IA 51301-0839
PO BOX 840, SPENCER, IA 51301-0840
PO BOX 841, SPENCER, IA 51301-0841
PO BOX 842, SPENCER, IA 51301-0842
PO BOX 843, SPENCER, IA 51301-0843
PO BOX 844, SPENCER, IA 51301-0844
PO BOX 845, SPENCER, IA 51301-0845
PO BOX 846, SPENCER, IA 51301-0846
PO BOX 847, SPENCER, IA 51301-0847
PO BOX 848, SPENCER, IA 51301-0848
PO BOX 849, SPENCER, IA 51301-0849
PO BOX 850, SPENCER, IA 51301-0850
PO BOX 851, SPENCER, IA 51301-0851
PO BOX 852, SPENCER, IA 51301-0852
PO BOX 853, SPENCER, IA 51301-0853
PO BOX 854, SPENCER, IA 51301-0854
PO BOX 855, SPENCER, IA 51301-0855
PO BOX 856, SPENCER, IA 51301-0856
PO BOX 857, SPENCER, IA 51301-0857
PO BOX 858, SPENCER, IA 51301-0858
PO BOX 859, SPENCER, IA 51301-0859
PO BOX 860, SPENCER, IA 51301-0860
PO BOX 861, SPENCER, IA 51301-0861
PO BOX 862, SPENCER, IA 51301-0862
PO BOX 863, SPENCER, IA 51301-0863
PO BOX 864, SPENCER, IA 51301-0864
PO BOX 865, SPENCER, IA 51301-0865
PO BOX 866, SPENCER, IA 51301-0866
PO BOX 867, SPENCER, IA 51301-0867
PO BOX 868, SPENCER, IA 51301-0868
PO BOX 869, SPENCER, IA 51301-0869
PO BOX 870, SPENCER, IA 51301-0870
PO BOX 871, SPENCER, IA 51301-0871
PO BOX 872, SPENCER, IA 51301-0872
PO BOX 873, SPENCER, IA 51301-0873
PO BOX 874, SPENCER, IA 51301-0874
PO BOX 875, SPENCER, IA 51301-0875
PO BOX 876, SPENCER, IA 51301-0876
PO BOX 877, SPENCER, IA 51301-0877
PO BOX 878, SPENCER, IA 51301-0878
PO BOX 879, SPENCER, IA 51301-0879
PO BOX 880, SPENCER, IA 51301-0880
PO BOX 881, SPENCER, IA 51301-0881
PO BOX 882, SPENCER, IA 51301-0882
PO BOX 883, SPENCER, IA 51301-0883
PO BOX 884, SPENCER, IA 51301-0884
PO BOX 885, SPENCER, IA 51301-0885
PO BOX 886, SPENCER, IA 51301-0886
PO BOX 887, SPENCER, IA 51301-0887
PO BOX 888, SPENCER, IA 51301-0888
PO BOX 889, SPENCER, IA 51301-0889
PO BOX 890, SPENCER, IA 51301-0890
PO BOX 891, SPENCER, IA 51301-0891
PO BOX 892, SPENCER, IA 51301-0892
PO BOX 893, SPENCER, IA 51301-0893
PO BOX 894, SPENCER, IA 51301-0894
PO BOX 895, SPENCER, IA 51301-0895
PO BOX 896, SPENCER, IA 51301-0896
PO BOX 897, SPENCER, IA 51301-0897
PO BOX 898, SPENCER, IA 51301-0898
PO BOX 899, SPENCER, IA 51301-0899
PO BOX 900, SPENCER, IA 51301-0900
PO BOX 901, SPENCER, IA 51301-0901
PO BOX 902, SPENCER, IA 51301-0902
PO BOX 903, SPENCER, IA 51301-0903
PO BOX 904, SPENCER, IA 51301-0904
PO BOX 905, SPENCER, IA 51301-0905
PO BOX 906, SPENCER, IA 51301-0906
PO BOX 907, SPENCER, IA 51301-0907
PO BOX 908, SPENCER, IA 51301-0908
PO BOX 909, SPENCER, IA 51301-0909
PO BOX 910, SPENCER, IA 51301-0910
PO BOX 911, SPENCER, IA 51301-0911
PO BOX 912, SPENCER, IA 51301-0912
PO BOX 913, SPENCER, IA 51301-0913
PO BOX 914, SPENCER, IA 51301-0914
PO BOX 915, SPENCER, IA 51301-0915
PO BOX 916, SPENCER, IA 51301-0916
PO BOX 917, SPENCER, IA 51301-0917
PO BOX 918, SPENCER, IA 51301-0918
PO BOX 919, SPENCER, IA 51301-0919
PO BOX 920, SPENCER, IA 51301-0920
PO BOX 921, SPENCER, IA 51301-0921
PO BOX 922, SPENCER, IA 51301-0922
PO BOX 923, SPENCER, IA 51301-0923
PO BOX 924, SPENCER, IA 51301-0924
PO BOX 925, SPENCER, IA 51301-0925
PO BOX 926, SPENCER, IA 51301-0926
PO BOX 927, SPENCER, IA 51301-0927
PO BOX 928, SPENCER, IA 51301-0928
PO BOX 929, SPENCER, IA 51301-0929
PO BOX 930, SPENCER, IA 51301-0930
PO BOX 931, SPENCER, IA 51301-0931
PO BOX 932, SPENCER, IA 51301-0932
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