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 801, CLEAR LAKE, IA 50428-0801
PO BOX 802, CLEAR LAKE, IA 50428-0802
PO BOX 803, CLEAR LAKE, IA 50428-0803
PO BOX 804, CLEAR LAKE, IA 50428-0804
PO BOX 805, CLEAR LAKE, IA 50428-0805
PO BOX 806, CLEAR LAKE, IA 50428-0806
PO BOX 807, CLEAR LAKE, IA 50428-0807
PO BOX 808, CLEAR LAKE, IA 50428-0808
PO BOX 809, CLEAR LAKE, IA 50428-0809
PO BOX 810, CLEAR LAKE, IA 50428-0810
PO BOX 811, CLEAR LAKE, IA 50428-0811
PO BOX 812, CLEAR LAKE, IA 50428-0812
PO BOX 813, CLEAR LAKE, IA 50428-0813
PO BOX 814, CLEAR LAKE, IA 50428-0814
PO BOX 815, CLEAR LAKE, IA 50428-0815
PO BOX 816, CLEAR LAKE, IA 50428-0816
PO BOX 817, CLEAR LAKE, IA 50428-0817
PO BOX 818, CLEAR LAKE, IA 50428-0818
PO BOX 819, CLEAR LAKE, IA 50428-0819
PO BOX 820, CLEAR LAKE, IA 50428-0820
PO BOX 821, CLEAR LAKE, IA 50428-0821
PO BOX 822, CLEAR LAKE, IA 50428-0822
PO BOX 823, CLEAR LAKE, IA 50428-0823
PO BOX 824, CLEAR LAKE, IA 50428-0824
PO BOX 825, CLEAR LAKE, IA 50428-0825
PO BOX 826, CLEAR LAKE, IA 50428-0826
PO BOX 827, CLEAR LAKE, IA 50428-0827
PO BOX 828, CLEAR LAKE, IA 50428-0828
PO BOX 829, CLEAR LAKE, IA 50428-0829
PO BOX 830, CLEAR LAKE, IA 50428-0830
PO BOX 831, CLEAR LAKE, IA 50428-0831
PO BOX 832, CLEAR LAKE, IA 50428-0832
PO BOX 833, CLEAR LAKE, IA 50428-0833
PO BOX 834, CLEAR LAKE, IA 50428-0834
PO BOX 835, CLEAR LAKE, IA 50428-0835
PO BOX 836, CLEAR LAKE, IA 50428-0836
PO BOX 837, CLEAR LAKE, IA 50428-0837
PO BOX 838, CLEAR LAKE, IA 50428-0838
PO BOX 839, CLEAR LAKE, IA 50428-0839
PO BOX 840, CLEAR LAKE, IA 50428-0840
PO BOX 841, CLEAR LAKE, IA 50428-0841
PO BOX 842, CLEAR LAKE, IA 50428-0842
PO BOX 843, CLEAR LAKE, IA 50428-0843
PO BOX 844, CLEAR LAKE, IA 50428-0844
PO BOX 845, CLEAR LAKE, IA 50428-0845
PO BOX 846, CLEAR LAKE, IA 50428-0846
PO BOX 847, CLEAR LAKE, IA 50428-0847
PO BOX 848, CLEAR LAKE, IA 50428-0848
PO BOX 849, CLEAR LAKE, IA 50428-0849
PO BOX 850, CLEAR LAKE, IA 50428-0850
PO BOX 851, CLEAR LAKE, IA 50428-0851
PO BOX 852, CLEAR LAKE, IA 50428-0852
PO BOX 853, CLEAR LAKE, IA 50428-0853
PO BOX 854, CLEAR LAKE, IA 50428-0854
PO BOX 855, CLEAR LAKE, IA 50428-0855
PO BOX 856, CLEAR LAKE, IA 50428-0856
PO BOX 857, CLEAR LAKE, IA 50428-0857
PO BOX 858, CLEAR LAKE, IA 50428-0858
PO BOX 859, CLEAR LAKE, IA 50428-0859
PO BOX 860, CLEAR LAKE, IA 50428-0860
PO BOX 861, CLEAR LAKE, IA 50428-0861
PO BOX 862, CLEAR LAKE, IA 50428-0862
PO BOX 863, CLEAR LAKE, IA 50428-0863
PO BOX 864, CLEAR LAKE, IA 50428-0864
PO BOX 865, CLEAR LAKE, IA 50428-0865
PO BOX 866, CLEAR LAKE, IA 50428-0866
PO BOX 867, CLEAR LAKE, IA 50428-0867
PO BOX 868, CLEAR LAKE, IA 50428-0868
PO BOX 869, CLEAR LAKE, IA 50428-0869
PO BOX 870, CLEAR LAKE, IA 50428-0870
PO BOX 871, CLEAR LAKE, IA 50428-0871
PO BOX 872, CLEAR LAKE, IA 50428-0872
PO BOX 873, CLEAR LAKE, IA 50428-0873
PO BOX 874, CLEAR LAKE, IA 50428-0874
PO BOX 875, CLEAR LAKE, IA 50428-0875
PO BOX 876, CLEAR LAKE, IA 50428-0876
PO BOX 877, CLEAR LAKE, IA 50428-0877
PO BOX 878, CLEAR LAKE, IA 50428-0878
PO BOX 879, CLEAR LAKE, IA 50428-0879
PO BOX 880, CLEAR LAKE, IA 50428-0880
PO BOX 881, CLEAR LAKE, IA 50428-0881
PO BOX 882, CLEAR LAKE, IA 50428-0882
PO BOX 883, CLEAR LAKE, IA 50428-0883
PO BOX 884, CLEAR LAKE, IA 50428-0884
PO BOX 885, CLEAR LAKE, IA 50428-0885
PO BOX 886, CLEAR LAKE, IA 50428-0886
PO BOX 887, CLEAR LAKE, IA 50428-0887
PO BOX 888, CLEAR LAKE, IA 50428-0888
PO BOX 889, CLEAR LAKE, IA 50428-0889
PO BOX 890, CLEAR LAKE, IA 50428-0890
PO BOX 891, CLEAR LAKE, IA 50428-0891
PO BOX 892, CLEAR LAKE, IA 50428-0892
PO BOX 893, CLEAR LAKE, IA 50428-0893
PO BOX 894, CLEAR LAKE, IA 50428-0894
PO BOX 895, CLEAR LAKE, IA 50428-0895
PO BOX 896, CLEAR LAKE, IA 50428-0896
PO BOX 897, CLEAR LAKE, IA 50428-0897
PO BOX 898, CLEAR LAKE, IA 50428-0898
PO BOX 899, CLEAR LAKE, IA 50428-0899
PO BOX 900, CLEAR LAKE, IA 50428-0900
PO BOX 901, CLEAR LAKE, IA 50428-0901
PO BOX 902, CLEAR LAKE, IA 50428-0902
PO BOX 903, CLEAR LAKE, IA 50428-0903
PO BOX 904, CLEAR LAKE, IA 50428-0904
PO BOX 905, CLEAR LAKE, IA 50428-0905
PO BOX 906, CLEAR LAKE, IA 50428-0906
PO BOX 907, CLEAR LAKE, IA 50428-0907
PO BOX 908, CLEAR LAKE, IA 50428-0908
PO BOX 909, CLEAR LAKE, IA 50428-0909
PO BOX 910, CLEAR LAKE, IA 50428-0910
PO BOX 911, CLEAR LAKE, IA 50428-0911
PO BOX 912, CLEAR LAKE, IA 50428-0912
PO BOX 913, CLEAR LAKE, IA 50428-0913
PO BOX 914, CLEAR LAKE, IA 50428-0914
PO BOX 915, CLEAR LAKE, IA 50428-0915
PO BOX 916, CLEAR LAKE, IA 50428-0916
PO BOX 917, CLEAR LAKE, IA 50428-0917
PO BOX 918, CLEAR LAKE, IA 50428-0918
PO BOX 919, CLEAR LAKE, IA 50428-0919
PO BOX 920, CLEAR LAKE, IA 50428-0920
PO BOX 921, CLEAR LAKE, IA 50428-0921
PO BOX 922, CLEAR LAKE, IA 50428-0922
PO BOX 923, CLEAR LAKE, IA 50428-0923
PO BOX 924, CLEAR LAKE, IA 50428-0924
PO BOX 925, CLEAR LAKE, IA 50428-0925
PO BOX 926, CLEAR LAKE, IA 50428-0926
PO BOX 927, CLEAR LAKE, IA 50428-0927
PO BOX 928, CLEAR LAKE, IA 50428-0928
PO BOX 929, CLEAR LAKE, IA 50428-0929
PO BOX 930, CLEAR LAKE, IA 50428-0930
PO BOX 931, CLEAR LAKE, IA 50428-0931
PO BOX 932, CLEAR LAKE, IA 50428-0932
PO BOX 933, CLEAR LAKE, IA 50428-0933
PO BOX 934, CLEAR LAKE, IA 50428-0934
PO BOX 935, CLEAR LAKE, IA 50428-0935
PO BOX 936, CLEAR LAKE, IA 50428-0936
PO BOX 937, CLEAR LAKE, IA 50428-0937
PO BOX 938, CLEAR LAKE, IA 50428-0938
PO BOX 939, CLEAR LAKE, IA 50428-0939
PO BOX 940, CLEAR LAKE, IA 50428-0940
PO BOX 941, CLEAR LAKE, IA 50428-0941
PO BOX 942, CLEAR LAKE, IA 50428-0942
PO BOX 943, CLEAR LAKE, IA 50428-0943
PO BOX 944, CLEAR LAKE, IA 50428-0944
PO BOX 945, CLEAR LAKE, IA 50428-0945
PO BOX 946, CLEAR LAKE, IA 50428-0946
PO BOX 947, CLEAR LAKE, IA 50428-0947
PO BOX 948, CLEAR LAKE, IA 50428-0948
PO BOX 949, CLEAR LAKE, IA 50428-0949
PO BOX 950, CLEAR LAKE, IA 50428-0950
PO BOX 951, CLEAR LAKE, IA 50428-0951
PO BOX 952, CLEAR LAKE, IA 50428-0952
PO BOX 953, CLEAR LAKE, IA 50428-0953
PO BOX 954, CLEAR LAKE, IA 50428-0954
PO BOX 955, CLEAR LAKE, IA 50428-0955
PO BOX 956, CLEAR LAKE, IA 50428-0956
PO BOX 957, CLEAR LAKE, IA 50428-0957
PO BOX 958, CLEAR LAKE, IA 50428-0958
PO BOX 959, CLEAR LAKE, IA 50428-0959
PO BOX 960, CLEAR LAKE, IA 50428-0960
PO BOX 961, CLEAR LAKE, IA 50428-0961
PO BOX 962, CLEAR LAKE, IA 50428-0962
PO BOX 963, CLEAR LAKE, IA 50428-0963
PO BOX 964, CLEAR LAKE, IA 50428-0964
PO BOX 965, CLEAR LAKE, IA 50428-0965
PO BOX 966, CLEAR LAKE, IA 50428-0966
PO BOX 967, CLEAR LAKE, IA 50428-0967
PO BOX 968, CLEAR LAKE, IA 50428-0968
PO BOX 969, CLEAR LAKE, IA 50428-0969
PO BOX 970, CLEAR LAKE, IA 50428-0970
PO BOX 971, CLEAR LAKE, IA 50428-0971
PO BOX 972, CLEAR LAKE, IA 50428-0972
PO BOX 973, CLEAR LAKE, IA 50428-0973
PO BOX 974, CLEAR LAKE, IA 50428-0974
PO BOX 975, CLEAR LAKE, IA 50428-0975
PO BOX 976, CLEAR LAKE, IA 50428-0976
PO BOX 977, CLEAR LAKE, IA 50428-0977
PO BOX 978, CLEAR LAKE, IA 50428-0978
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