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 641, IOWA CITY, IA 52244-0641
PO BOX 642, IOWA CITY, IA 52244-0642
PO BOX 643, IOWA CITY, IA 52244-0643
PO BOX 644, IOWA CITY, IA 52244-0644
PO BOX 645, IOWA CITY, IA 52244-0645
PO BOX 646, IOWA CITY, IA 52244-0646
PO BOX 647, IOWA CITY, IA 52244-0647
PO BOX 648, IOWA CITY, IA 52244-0648
PO BOX 649, IOWA CITY, IA 52244-0649
PO BOX 650, IOWA CITY, IA 52244-0650
PO BOX 651, IOWA CITY, IA 52244-0651
PO BOX 652, IOWA CITY, IA 52244-0652
PO BOX 653, IOWA CITY, IA 52244-0653
PO BOX 654, IOWA CITY, IA 52244-0654
PO BOX 655, IOWA CITY, IA 52244-0655
PO BOX 656, IOWA CITY, IA 52244-0656
PO BOX 657, IOWA CITY, IA 52244-0657
PO BOX 658, IOWA CITY, IA 52244-0658
PO BOX 659, IOWA CITY, IA 52244-0659
PO BOX 660, IOWA CITY, IA 52244-0660
PO BOX 661, IOWA CITY, IA 52244-0661
PO BOX 662, IOWA CITY, IA 52244-0662
PO BOX 663, IOWA CITY, IA 52244-0663
PO BOX 664, IOWA CITY, IA 52244-0664
PO BOX 665, IOWA CITY, IA 52244-0665
PO BOX 666, IOWA CITY, IA 52244-0666
PO BOX 667, IOWA CITY, IA 52244-0667
PO BOX 668, IOWA CITY, IA 52244-0668
PO BOX 669, IOWA CITY, IA 52244-0669
PO BOX 670, IOWA CITY, IA 52244-0670
PO BOX 671, IOWA CITY, IA 52244-0671
PO BOX 672, IOWA CITY, IA 52244-0672
PO BOX 673, IOWA CITY, IA 52244-0673
PO BOX 674, IOWA CITY, IA 52244-0674
PO BOX 675, IOWA CITY, IA 52244-0675
PO BOX 676, IOWA CITY, IA 52244-0676
PO BOX 677, IOWA CITY, IA 52244-0677
PO BOX 678, IOWA CITY, IA 52244-0678
PO BOX 679, IOWA CITY, IA 52244-0679
PO BOX 680, IOWA CITY, IA 52244-0680
PO BOX 681, IOWA CITY, IA 52244-0681
PO BOX 682, IOWA CITY, IA 52244-0682
PO BOX 683, IOWA CITY, IA 52244-0683
PO BOX 684, IOWA CITY, IA 52244-0684
PO BOX 685, IOWA CITY, IA 52244-0685
PO BOX 686, IOWA CITY, IA 52244-0686
PO BOX 687, IOWA CITY, IA 52244-0687
PO BOX 688, IOWA CITY, IA 52244-0688
PO BOX 689, IOWA CITY, IA 52244-0689
PO BOX 690, IOWA CITY, IA 52244-0690
PO BOX 691, IOWA CITY, IA 52244-0691
PO BOX 692, IOWA CITY, IA 52244-0692
PO BOX 693, IOWA CITY, IA 52244-0693
PO BOX 694, IOWA CITY, IA 52244-0694
PO BOX 695, IOWA CITY, IA 52244-0695
PO BOX 696, IOWA CITY, IA 52244-0696
PO BOX 697, IOWA CITY, IA 52244-0697
PO BOX 698, IOWA CITY, IA 52244-0698
PO BOX 699, IOWA CITY, IA 52244-0699
PO BOX 700, IOWA CITY, IA 52244-0700
PO BOX 701, IOWA CITY, IA 52244-0701
PO BOX 702, IOWA CITY, IA 52244-0702
PO BOX 703, IOWA CITY, IA 52244-0703
PO BOX 704, IOWA CITY, IA 52244-0704
PO BOX 705, IOWA CITY, IA 52244-0705
PO BOX 706, IOWA CITY, IA 52244-0706
PO BOX 707, IOWA CITY, IA 52244-0707
PO BOX 708, IOWA CITY, IA 52244-0708
PO BOX 709, IOWA CITY, IA 52244-0709
PO BOX 710, IOWA CITY, IA 52244-0710
PO BOX 711, IOWA CITY, IA 52244-0711
PO BOX 712, IOWA CITY, IA 52244-0712
PO BOX 713, IOWA CITY, IA 52244-0713
PO BOX 714, IOWA CITY, IA 52244-0714
PO BOX 715, IOWA CITY, IA 52244-0715
PO BOX 716, IOWA CITY, IA 52244-0716
PO BOX 717, IOWA CITY, IA 52244-0717
PO BOX 718, IOWA CITY, IA 52244-0718
PO BOX 719, IOWA CITY, IA 52244-0719
PO BOX 720, IOWA CITY, IA 52244-0720
PO BOX 721, IOWA CITY, IA 52244-0721
PO BOX 722, IOWA CITY, IA 52244-0722
PO BOX 723, IOWA CITY, IA 52244-0723
PO BOX 724, IOWA CITY, IA 52244-0724
PO BOX 725, IOWA CITY, IA 52244-0725
PO BOX 726, IOWA CITY, IA 52244-0726
PO BOX 727, IOWA CITY, IA 52244-0727
PO BOX 728, IOWA CITY, IA 52244-0728
PO BOX 729, IOWA CITY, IA 52244-0729
PO BOX 730, IOWA CITY, IA 52244-0730
PO BOX 731, IOWA CITY, IA 52244-0731
PO BOX 732, IOWA CITY, IA 52244-0732
PO BOX 733, IOWA CITY, IA 52244-0733
PO BOX 734, IOWA CITY, IA 52244-0734
PO BOX 735, IOWA CITY, IA 52244-0735
PO BOX 736, IOWA CITY, IA 52244-0736
PO BOX 737, IOWA CITY, IA 52244-0737
PO BOX 738, IOWA CITY, IA 52244-0738
PO BOX 739, IOWA CITY, IA 52244-0739
PO BOX 740, IOWA CITY, IA 52244-0740
PO BOX 741, IOWA CITY, IA 52244-0741
PO BOX 742, IOWA CITY, IA 52244-0742
PO BOX 743, IOWA CITY, IA 52244-0743
PO BOX 744, IOWA CITY, IA 52244-0744
PO BOX 745, IOWA CITY, IA 52244-0745
PO BOX 746, IOWA CITY, IA 52244-0746
PO BOX 747, IOWA CITY, IA 52244-0747
PO BOX 748, IOWA CITY, IA 52244-0748
PO BOX 749, IOWA CITY, IA 52244-0749
PO BOX 750, IOWA CITY, IA 52244-0750
PO BOX 751, IOWA CITY, IA 52244-0751
PO BOX 752, IOWA CITY, IA 52244-0752
PO BOX 753, IOWA CITY, IA 52244-0753
PO BOX 754, IOWA CITY, IA 52244-0754
PO BOX 755, IOWA CITY, IA 52244-0755
PO BOX 756, IOWA CITY, IA 52244-0756
PO BOX 757, IOWA CITY, IA 52244-0757
PO BOX 758, IOWA CITY, IA 52244-0758
PO BOX 759, IOWA CITY, IA 52244-0759
PO BOX 760, IOWA CITY, IA 52244-0760
PO BOX 761, IOWA CITY, IA 52244-0761
PO BOX 762, IOWA CITY, IA 52244-0762
PO BOX 763, IOWA CITY, IA 52244-0763
PO BOX 764, IOWA CITY, IA 52244-0764
PO BOX 765, IOWA CITY, IA 52244-0765
PO BOX 766, IOWA CITY, IA 52244-0766
PO BOX 767, IOWA CITY, IA 52244-0767
PO BOX 768, IOWA CITY, IA 52244-0768
PO BOX 769, IOWA CITY, IA 52244-0769
PO BOX 770, IOWA CITY, IA 52244-0770
PO BOX 771, IOWA CITY, IA 52244-0771
PO BOX 772, IOWA CITY, IA 52244-0772
PO BOX 773, IOWA CITY, IA 52244-0773
PO BOX 774, IOWA CITY, IA 52244-0774
PO BOX 775, IOWA CITY, IA 52244-0775
PO BOX 776, IOWA CITY, IA 52244-0776
PO BOX 777, IOWA CITY, IA 52244-0777
PO BOX 778, IOWA CITY, IA 52244-0778
PO BOX 779, IOWA CITY, IA 52244-0779
PO BOX 780, IOWA CITY, IA 52244-0780
PO BOX 781, IOWA CITY, IA 52244-0781
PO BOX 782, IOWA CITY, IA 52244-0782
PO BOX 783, IOWA CITY, IA 52244-0783
PO BOX 784, IOWA CITY, IA 52244-0784
PO BOX 785, IOWA CITY, IA 52244-0785
PO BOX 786, IOWA CITY, IA 52244-0786
PO BOX 787, IOWA CITY, IA 52244-0787
PO BOX 788, IOWA CITY, IA 52244-0788
PO BOX 789, IOWA CITY, IA 52244-0789
PO BOX 790, IOWA CITY, IA 52244-0790
PO BOX 791, IOWA CITY, IA 52244-0791
PO BOX 792, IOWA CITY, IA 52244-0792
PO BOX 793, IOWA CITY, IA 52244-0793
PO BOX 794, IOWA CITY, IA 52244-0794
PO BOX 795, IOWA CITY, IA 52244-0795
PO BOX 796, IOWA CITY, IA 52244-0796
PO BOX 797, IOWA CITY, IA 52244-0797
PO BOX 798, IOWA CITY, IA 52244-0798
PO BOX 799, IOWA CITY, IA 52244-0799
PO BOX 800, IOWA CITY, IA 52244-0800
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