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, IOWA CITY, IA 52244-0801
PO BOX 802, IOWA CITY, IA 52244-0802
PO BOX 803, IOWA CITY, IA 52244-0803
PO BOX 804, IOWA CITY, IA 52244-0804
PO BOX 805, IOWA CITY, IA 52244-0805
PO BOX 806, IOWA CITY, IA 52244-0806
PO BOX 807, IOWA CITY, IA 52244-0807
PO BOX 808, IOWA CITY, IA 52244-0808
PO BOX 809, IOWA CITY, IA 52244-0809
PO BOX 810, IOWA CITY, IA 52244-0810
PO BOX 811, IOWA CITY, IA 52244-0811
PO BOX 812, IOWA CITY, IA 52244-0812
PO BOX 813, IOWA CITY, IA 52244-0813
PO BOX 814, IOWA CITY, IA 52244-0814
PO BOX 815, IOWA CITY, IA 52244-0815
PO BOX 816, IOWA CITY, IA 52244-0816
PO BOX 817, IOWA CITY, IA 52244-0817
PO BOX 818, IOWA CITY, IA 52244-0818
PO BOX 819, IOWA CITY, IA 52244-0819
PO BOX 820, IOWA CITY, IA 52244-0820
PO BOX 821, IOWA CITY, IA 52244-0821
PO BOX 822, IOWA CITY, IA 52244-0822
PO BOX 823, IOWA CITY, IA 52244-0823
PO BOX 824, IOWA CITY, IA 52244-0824
PO BOX 825, IOWA CITY, IA 52244-0825
PO BOX 826, IOWA CITY, IA 52244-0826
PO BOX 827, IOWA CITY, IA 52244-0827
PO BOX 828, IOWA CITY, IA 52244-0828
PO BOX 829, IOWA CITY, IA 52244-0829
PO BOX 830, IOWA CITY, IA 52244-0830
PO BOX 831, IOWA CITY, IA 52244-0831
PO BOX 832, IOWA CITY, IA 52244-0832
PO BOX 833, IOWA CITY, IA 52244-0833
PO BOX 834, IOWA CITY, IA 52244-0834
PO BOX 835, IOWA CITY, IA 52244-0835
PO BOX 836, IOWA CITY, IA 52244-0836
PO BOX 837, IOWA CITY, IA 52244-0837
PO BOX 838, IOWA CITY, IA 52244-0838
PO BOX 839, IOWA CITY, IA 52244-0839
PO BOX 840, IOWA CITY, IA 52244-0840
PO BOX 841, IOWA CITY, IA 52244-0841
PO BOX 842, IOWA CITY, IA 52244-0842
PO BOX 843, IOWA CITY, IA 52244-0843
PO BOX 844, IOWA CITY, IA 52244-0844
PO BOX 845, IOWA CITY, IA 52244-0845
PO BOX 846, IOWA CITY, IA 52244-0846
PO BOX 847, IOWA CITY, IA 52244-0847
PO BOX 848, IOWA CITY, IA 52244-0848
PO BOX 849, IOWA CITY, IA 52244-0849
PO BOX 850, IOWA CITY, IA 52244-0850
PO BOX 851, IOWA CITY, IA 52244-0851
PO BOX 852, IOWA CITY, IA 52244-0852
PO BOX 853, IOWA CITY, IA 52244-0853
PO BOX 854, IOWA CITY, IA 52244-0854
PO BOX 855, IOWA CITY, IA 52244-0855
PO BOX 856, IOWA CITY, IA 52244-0856
PO BOX 857, IOWA CITY, IA 52244-0857
PO BOX 858, IOWA CITY, IA 52244-0858
PO BOX 859, IOWA CITY, IA 52244-0859
PO BOX 860, IOWA CITY, IA 52244-0860
PO BOX 861, IOWA CITY, IA 52244-0861
PO BOX 862, IOWA CITY, IA 52244-0862
PO BOX 863, IOWA CITY, IA 52244-0863
PO BOX 864, IOWA CITY, IA 52244-0864
PO BOX 865, IOWA CITY, IA 52244-0865
PO BOX 866, IOWA CITY, IA 52244-0866
PO BOX 867, IOWA CITY, IA 52244-0867
PO BOX 868, IOWA CITY, IA 52244-0868
PO BOX 869, IOWA CITY, IA 52244-0869
PO BOX 870, IOWA CITY, IA 52244-0870
PO BOX 871, IOWA CITY, IA 52244-0871
PO BOX 872, IOWA CITY, IA 52244-0872
PO BOX 873, IOWA CITY, IA 52244-0873
PO BOX 874, IOWA CITY, IA 52244-0874
PO BOX 875, IOWA CITY, IA 52244-0875
PO BOX 876, IOWA CITY, IA 52244-0876
PO BOX 877, IOWA CITY, IA 52244-0877
PO BOX 878, IOWA CITY, IA 52244-0878
PO BOX 879, IOWA CITY, IA 52244-0879
PO BOX 880, IOWA CITY, IA 52244-0880
PO BOX 881, IOWA CITY, IA 52244-0881
PO BOX 882, IOWA CITY, IA 52244-0882
PO BOX 883, IOWA CITY, IA 52244-0883
PO BOX 884, IOWA CITY, IA 52244-0884
PO BOX 885, IOWA CITY, IA 52244-0885
PO BOX 886, IOWA CITY, IA 52244-0886
PO BOX 887, IOWA CITY, IA 52244-0887
PO BOX 888, IOWA CITY, IA 52244-0888
PO BOX 889, IOWA CITY, IA 52244-0889
PO BOX 890, IOWA CITY, IA 52244-0890
PO BOX 891, IOWA CITY, IA 52244-0891
PO BOX 892, IOWA CITY, IA 52244-0892
PO BOX 893, IOWA CITY, IA 52244-0893
PO BOX 894, IOWA CITY, IA 52244-0894
PO BOX 895, IOWA CITY, IA 52244-0895
PO BOX 896, IOWA CITY, IA 52244-0896
PO BOX 897, IOWA CITY, IA 52244-0897
PO BOX 898, IOWA CITY, IA 52244-0898
PO BOX 899, IOWA CITY, IA 52244-0899
PO BOX 900, IOWA CITY, IA 52244-0900
PO BOX 901, IOWA CITY, IA 52244-0901
PO BOX 902, IOWA CITY, IA 52244-0902
PO BOX 903, IOWA CITY, IA 52244-0903
PO BOX 904, IOWA CITY, IA 52244-0904
PO BOX 905, IOWA CITY, IA 52244-0905
PO BOX 906, IOWA CITY, IA 52244-0906
PO BOX 907, IOWA CITY, IA 52244-0907
PO BOX 908, IOWA CITY, IA 52244-0908
PO BOX 909, IOWA CITY, IA 52244-0909
PO BOX 910, IOWA CITY, IA 52244-0910
PO BOX 911, IOWA CITY, IA 52244-0911
PO BOX 912, IOWA CITY, IA 52244-0912
PO BOX 913, IOWA CITY, IA 52244-0913
PO BOX 914, IOWA CITY, IA 52244-0914
PO BOX 915, IOWA CITY, IA 52244-0915
PO BOX 916, IOWA CITY, IA 52244-0916
PO BOX 917, IOWA CITY, IA 52244-0917
PO BOX 918, IOWA CITY, IA 52244-0918
PO BOX 919, IOWA CITY, IA 52244-0919
PO BOX 920, IOWA CITY, IA 52244-0920
PO BOX 921, IOWA CITY, IA 52244-0921
PO BOX 922, IOWA CITY, IA 52244-0922
PO BOX 923, IOWA CITY, IA 52244-0923
PO BOX 924, IOWA CITY, IA 52244-0924
PO BOX 925, IOWA CITY, IA 52244-0925
PO BOX 926, IOWA CITY, IA 52244-0926
PO BOX 927, IOWA CITY, IA 52244-0927
PO BOX 928, IOWA CITY, IA 52244-0928
PO BOX 929, IOWA CITY, IA 52244-0929
PO BOX 930, IOWA CITY, IA 52244-0930
PO BOX 931, IOWA CITY, IA 52244-0931
PO BOX 932, IOWA CITY, IA 52244-0932
PO BOX 933, IOWA CITY, IA 52244-0933
PO BOX 934, IOWA CITY, IA 52244-0934
PO BOX 935, IOWA CITY, IA 52244-0935
PO BOX 936, IOWA CITY, IA 52244-0936
PO BOX 937, IOWA CITY, IA 52244-0937
PO BOX 938, IOWA CITY, IA 52244-0938
PO BOX 939, IOWA CITY, IA 52244-0939
PO BOX 940, IOWA CITY, IA 52244-0940
PO BOX 941, IOWA CITY, IA 52244-0941
PO BOX 942, IOWA CITY, IA 52244-0942
PO BOX 943, IOWA CITY, IA 52244-0943
PO BOX 944, IOWA CITY, IA 52244-0944
PO BOX 945, IOWA CITY, IA 52244-0945
PO BOX 946, IOWA CITY, IA 52244-0946
PO BOX 947, IOWA CITY, IA 52244-0947
PO BOX 948, IOWA CITY, IA 52244-0948
PO BOX 949, IOWA CITY, IA 52244-0949
PO BOX 950, IOWA CITY, IA 52244-0950
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