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, ALTOONA, PA 16603-0641
PO BOX 642, ALTOONA, PA 16603-0642
PO BOX 643, ALTOONA, PA 16603-0643
PO BOX 644, ALTOONA, PA 16603-0644
PO BOX 645, ALTOONA, PA 16603-0645
PO BOX 646, ALTOONA, PA 16603-0646
PO BOX 647, ALTOONA, PA 16603-0647
PO BOX 648, ALTOONA, PA 16603-0648
PO BOX 649, ALTOONA, PA 16603-0649
PO BOX 650, ALTOONA, PA 16603-0650
PO BOX 651, ALTOONA, PA 16603-0651
PO BOX 652, ALTOONA, PA 16603-0652
PO BOX 653, ALTOONA, PA 16603-0653
PO BOX 654, ALTOONA, PA 16603-0654
PO BOX 655, ALTOONA, PA 16603-0655
PO BOX 656, ALTOONA, PA 16603-0656
PO BOX 657, ALTOONA, PA 16603-0657
PO BOX 658, ALTOONA, PA 16603-0658
PO BOX 659, ALTOONA, PA 16603-0659
PO BOX 660, ALTOONA, PA 16603-0660
PO BOX 661, ALTOONA, PA 16603-0661
PO BOX 662, ALTOONA, PA 16603-0662
PO BOX 663, ALTOONA, PA 16603-0663
PO BOX 664, ALTOONA, PA 16603-0664
PO BOX 665, ALTOONA, PA 16603-0665
PO BOX 666, ALTOONA, PA 16603-0666
PO BOX 667, ALTOONA, PA 16603-0667
PO BOX 668, ALTOONA, PA 16603-0668
PO BOX 669, ALTOONA, PA 16603-0669
PO BOX 670, ALTOONA, PA 16603-0670
PO BOX 671, ALTOONA, PA 16603-0671
PO BOX 672, ALTOONA, PA 16603-0672
PO BOX 673, ALTOONA, PA 16603-0673
PO BOX 674, ALTOONA, PA 16603-0674
PO BOX 675, ALTOONA, PA 16603-0675
PO BOX 676, ALTOONA, PA 16603-0676
PO BOX 677, ALTOONA, PA 16603-0677
PO BOX 678, ALTOONA, PA 16603-0678
PO BOX 679, ALTOONA, PA 16603-0679
PO BOX 680, ALTOONA, PA 16603-0680
PO BOX 681, ALTOONA, PA 16603-0681
PO BOX 682, ALTOONA, PA 16603-0682
PO BOX 683, ALTOONA, PA 16603-0683
PO BOX 684, ALTOONA, PA 16603-0684
PO BOX 685, ALTOONA, PA 16603-0685
PO BOX 686, ALTOONA, PA 16603-0686
PO BOX 687, ALTOONA, PA 16603-0687
PO BOX 688, ALTOONA, PA 16603-0688
PO BOX 689, ALTOONA, PA 16603-0689
PO BOX 690, ALTOONA, PA 16603-0690
PO BOX 691, ALTOONA, PA 16603-0691
PO BOX 692, ALTOONA, PA 16603-0692
PO BOX 693, ALTOONA, PA 16603-0693
PO BOX 694, ALTOONA, PA 16603-0694
PO BOX 695, ALTOONA, PA 16603-0695
PO BOX 696, ALTOONA, PA 16603-0696
PO BOX 697, ALTOONA, PA 16603-0697
PO BOX 698, ALTOONA, PA 16603-0698
PO BOX 699, ALTOONA, PA 16603-0699
PO BOX 700, ALTOONA, PA 16603-0700
PO BOX 701, ALTOONA, PA 16603-0701
PO BOX 702, ALTOONA, PA 16603-0702
PO BOX 703, ALTOONA, PA 16603-0703
PO BOX 704, ALTOONA, PA 16603-0704
PO BOX 705, ALTOONA, PA 16603-0705
PO BOX 706, ALTOONA, PA 16603-0706
PO BOX 707, ALTOONA, PA 16603-0707
PO BOX 708, ALTOONA, PA 16603-0708
PO BOX 709, ALTOONA, PA 16603-0709
PO BOX 710, ALTOONA, PA 16603-0710
PO BOX 711, ALTOONA, PA 16603-0711
PO BOX 712, ALTOONA, PA 16603-0712
PO BOX 713, ALTOONA, PA 16603-0713
PO BOX 714, ALTOONA, PA 16603-0714
PO BOX 715, ALTOONA, PA 16603-0715
PO BOX 716, ALTOONA, PA 16603-0716
PO BOX 717, ALTOONA, PA 16603-0717
PO BOX 718, ALTOONA, PA 16603-0718
PO BOX 719, ALTOONA, PA 16603-0719
PO BOX 720, ALTOONA, PA 16603-0720
PO BOX 721, ALTOONA, PA 16603-0721
PO BOX 722, ALTOONA, PA 16603-0722
PO BOX 723, ALTOONA, PA 16603-0723
PO BOX 724, ALTOONA, PA 16603-0724
PO BOX 725, ALTOONA, PA 16603-0725
PO BOX 726, ALTOONA, PA 16603-0726
PO BOX 727, ALTOONA, PA 16603-0727
PO BOX 728, ALTOONA, PA 16603-0728
PO BOX 729, ALTOONA, PA 16603-0729
PO BOX 730, ALTOONA, PA 16603-0730
PO BOX 731, ALTOONA, PA 16603-0731
PO BOX 732, ALTOONA, PA 16603-0732
PO BOX 733, ALTOONA, PA 16603-0733
PO BOX 734, ALTOONA, PA 16603-0734
PO BOX 735, ALTOONA, PA 16603-0735
PO BOX 736, ALTOONA, PA 16603-0736
PO BOX 737, ALTOONA, PA 16603-0737
PO BOX 738, ALTOONA, PA 16603-0738
PO BOX 739, ALTOONA, PA 16603-0739
PO BOX 740, ALTOONA, PA 16603-0740
PO BOX 741, ALTOONA, PA 16603-0741
PO BOX 742, ALTOONA, PA 16603-0742
PO BOX 743, ALTOONA, PA 16603-0743
PO BOX 744, ALTOONA, PA 16603-0744
PO BOX 745, ALTOONA, PA 16603-0745
PO BOX 746, ALTOONA, PA 16603-0746
PO BOX 747, ALTOONA, PA 16603-0747
PO BOX 748, ALTOONA, PA 16603-0748
PO BOX 749, ALTOONA, PA 16603-0749
PO BOX 750, ALTOONA, PA 16603-0750
PO BOX 751, ALTOONA, PA 16603-0751
PO BOX 752, ALTOONA, PA 16603-0752
PO BOX 753, ALTOONA, PA 16603-0753
PO BOX 754, ALTOONA, PA 16603-0754
PO BOX 755, ALTOONA, PA 16603-0755
PO BOX 756, ALTOONA, PA 16603-0756
PO BOX 757, ALTOONA, PA 16603-0757
PO BOX 758, ALTOONA, PA 16603-0758
PO BOX 759, ALTOONA, PA 16603-0759
PO BOX 760, ALTOONA, PA 16603-0760
PO BOX 761, ALTOONA, PA 16603-0761
PO BOX 762, ALTOONA, PA 16603-0762
PO BOX 763, ALTOONA, PA 16603-0763
PO BOX 764, ALTOONA, PA 16603-0764
PO BOX 765, ALTOONA, PA 16603-0765
PO BOX 766, ALTOONA, PA 16603-0766
PO BOX 767, ALTOONA, PA 16603-0767
PO BOX 768, ALTOONA, PA 16603-0768
PO BOX 769, ALTOONA, PA 16603-0769
PO BOX 770, ALTOONA, PA 16603-0770
PO BOX 771, ALTOONA, PA 16603-0771
PO BOX 772, ALTOONA, PA 16603-0772
PO BOX 773, ALTOONA, PA 16603-0773
PO BOX 774, ALTOONA, PA 16603-0774
PO BOX 775, ALTOONA, PA 16603-0775
PO BOX 776, ALTOONA, PA 16603-0776
PO BOX 777, ALTOONA, PA 16603-0777
PO BOX 778, ALTOONA, PA 16603-0778
PO BOX 779, ALTOONA, PA 16603-0779
PO BOX 780, ALTOONA, PA 16603-0780
PO BOX 781, ALTOONA, PA 16603-0781
PO BOX 782, ALTOONA, PA 16603-0782
PO BOX 783, ALTOONA, PA 16603-0783
PO BOX 784, ALTOONA, PA 16603-0784
PO BOX 785, ALTOONA, PA 16603-0785
PO BOX 786, ALTOONA, PA 16603-0786
PO BOX 787, ALTOONA, PA 16603-0787
PO BOX 788, ALTOONA, PA 16603-0788
PO BOX 789, ALTOONA, PA 16603-0789
PO BOX 790, ALTOONA, PA 16603-0790
PO BOX 791, ALTOONA, PA 16603-0791
PO BOX 792, ALTOONA, PA 16603-0792
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