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, SAN FERNANDO, CA 91341-0641
PO BOX 642, SAN FERNANDO, CA 91341-0642
PO BOX 643, SAN FERNANDO, CA 91341-0643
PO BOX 644, SAN FERNANDO, CA 91341-0644
PO BOX 645, SAN FERNANDO, CA 91341-0645
PO BOX 646, SAN FERNANDO, CA 91341-0646
PO BOX 647, SAN FERNANDO, CA 91341-0647
PO BOX 648, SAN FERNANDO, CA 91341-0648
PO BOX 649, SAN FERNANDO, CA 91341-0649
PO BOX 650, SAN FERNANDO, CA 91341-0650
PO BOX 651, SAN FERNANDO, CA 91341-0651
PO BOX 652, SAN FERNANDO, CA 91341-0652
PO BOX 653, SAN FERNANDO, CA 91341-0653
PO BOX 654, SAN FERNANDO, CA 91341-0654
PO BOX 655, SAN FERNANDO, CA 91341-0655
PO BOX 656, SAN FERNANDO, CA 91341-0656
PO BOX 657, SAN FERNANDO, CA 91341-0657
PO BOX 658, SAN FERNANDO, CA 91341-0658
PO BOX 659, SAN FERNANDO, CA 91341-0659
PO BOX 660, SAN FERNANDO, CA 91341-0660
PO BOX 661, SAN FERNANDO, CA 91341-0661
PO BOX 662, SAN FERNANDO, CA 91341-0662
PO BOX 663, SAN FERNANDO, CA 91341-0663
PO BOX 664, SAN FERNANDO, CA 91341-0664
PO BOX 665, SAN FERNANDO, CA 91341-0665
PO BOX 666, SAN FERNANDO, CA 91341-0666
PO BOX 667, SAN FERNANDO, CA 91341-0667
PO BOX 668, SAN FERNANDO, CA 91341-0668
PO BOX 669, SAN FERNANDO, CA 91341-0669
PO BOX 670, SAN FERNANDO, CA 91341-0670
PO BOX 671, SAN FERNANDO, CA 91341-0671
PO BOX 672, SAN FERNANDO, CA 91341-0672
PO BOX 673, SAN FERNANDO, CA 91341-0673
PO BOX 674, SAN FERNANDO, CA 91341-0674
PO BOX 675, SAN FERNANDO, CA 91341-0675
PO BOX 676, SAN FERNANDO, CA 91341-0676
PO BOX 677, SAN FERNANDO, CA 91341-0677
PO BOX 678, SAN FERNANDO, CA 91341-0678
PO BOX 679, SAN FERNANDO, CA 91341-0679
PO BOX 680, SAN FERNANDO, CA 91341-0680
PO BOX 681, SAN FERNANDO, CA 91341-0681
PO BOX 682, SAN FERNANDO, CA 91341-0682
PO BOX 683, SAN FERNANDO, CA 91341-0683
PO BOX 684, SAN FERNANDO, CA 91341-0684
PO BOX 685, SAN FERNANDO, CA 91341-0685
PO BOX 686, SAN FERNANDO, CA 91341-0686
PO BOX 687, SAN FERNANDO, CA 91341-0687
PO BOX 688, SAN FERNANDO, CA 91341-0688
PO BOX 689, SAN FERNANDO, CA 91341-0689
PO BOX 690, SAN FERNANDO, CA 91341-0690
PO BOX 691, SAN FERNANDO, CA 91341-0691
PO BOX 692, SAN FERNANDO, CA 91341-0692
PO BOX 693, SAN FERNANDO, CA 91341-0693
PO BOX 694, SAN FERNANDO, CA 91341-0694
PO BOX 695, SAN FERNANDO, CA 91341-0695
PO BOX 696, SAN FERNANDO, CA 91341-0696
PO BOX 697, SAN FERNANDO, CA 91341-0697
PO BOX 698, SAN FERNANDO, CA 91341-0698
PO BOX 699, SAN FERNANDO, CA 91341-0699
PO BOX 700, SAN FERNANDO, CA 91341-0700
PO BOX 701, SAN FERNANDO, CA 91341-0701
PO BOX 702, SAN FERNANDO, CA 91341-0702
PO BOX 703, SAN FERNANDO, CA 91341-0703
PO BOX 704, SAN FERNANDO, CA 91341-0704
PO BOX 705, SAN FERNANDO, CA 91341-0705
PO BOX 706, SAN FERNANDO, CA 91341-0706
PO BOX 707, SAN FERNANDO, CA 91341-0707
PO BOX 708, SAN FERNANDO, CA 91341-0708
PO BOX 709, SAN FERNANDO, CA 91341-0709
PO BOX 710, SAN FERNANDO, CA 91341-0710
PO BOX 711, SAN FERNANDO, CA 91341-0711
PO BOX 712, SAN FERNANDO, CA 91341-0712
PO BOX 713, SAN FERNANDO, CA 91341-0713
PO BOX 714, SAN FERNANDO, CA 91341-0714
PO BOX 715, SAN FERNANDO, CA 91341-0715
PO BOX 716, SAN FERNANDO, CA 91341-0716
PO BOX 717, SAN FERNANDO, CA 91341-0717
PO BOX 718, SAN FERNANDO, CA 91341-0718
PO BOX 719, SAN FERNANDO, CA 91341-0719
PO BOX 720, SAN FERNANDO, CA 91341-0720
PO BOX 721, SAN FERNANDO, CA 91341-0721
PO BOX 722, SAN FERNANDO, CA 91341-0722
PO BOX 723, SAN FERNANDO, CA 91341-0723
PO BOX 724, SAN FERNANDO, CA 91341-0724
PO BOX 725, SAN FERNANDO, CA 91341-0725
PO BOX 726, SAN FERNANDO, CA 91341-0726
PO BOX 727, SAN FERNANDO, CA 91341-0727
PO BOX 728, SAN FERNANDO, CA 91341-0728
PO BOX 729, SAN FERNANDO, CA 91341-0729
PO BOX 730, SAN FERNANDO, CA 91341-0730
PO BOX 731, SAN FERNANDO, CA 91341-0731
PO BOX 732, SAN FERNANDO, CA 91341-0732
PO BOX 733, SAN FERNANDO, CA 91341-0733
PO BOX 734, SAN FERNANDO, CA 91341-0734
PO BOX 735, SAN FERNANDO, CA 91341-0735
PO BOX 736, SAN FERNANDO, CA 91341-0736
PO BOX 737, SAN FERNANDO, CA 91341-0737
PO BOX 738, SAN FERNANDO, CA 91341-0738
PO BOX 739, SAN FERNANDO, CA 91341-0739
PO BOX 740, SAN FERNANDO, CA 91341-0740
PO BOX 741, SAN FERNANDO, CA 91341-0741
PO BOX 742, SAN FERNANDO, CA 91341-0742
PO BOX 743, SAN FERNANDO, CA 91341-0743
PO BOX 744, SAN FERNANDO, CA 91341-0744
PO BOX 745, SAN FERNANDO, CA 91341-0745
PO BOX 746, SAN FERNANDO, CA 91341-0746
PO BOX 747, SAN FERNANDO, CA 91341-0747
PO BOX 748, SAN FERNANDO, CA 91341-0748
PO BOX 749, SAN FERNANDO, CA 91341-0749
PO BOX 750, SAN FERNANDO, CA 91341-0750
PO BOX 751, SAN FERNANDO, CA 91341-0751
PO BOX 752, SAN FERNANDO, CA 91341-0752
PO BOX 753, SAN FERNANDO, CA 91341-0753
PO BOX 754, SAN FERNANDO, CA 91341-0754
PO BOX 755, SAN FERNANDO, CA 91341-0755
PO BOX 756, SAN FERNANDO, CA 91341-0756
PO BOX 757, SAN FERNANDO, CA 91341-0757
PO BOX 758, SAN FERNANDO, CA 91341-0758
PO BOX 759, SAN FERNANDO, CA 91341-0759
PO BOX 760, SAN FERNANDO, CA 91341-0760
PO BOX 761, SAN FERNANDO, CA 91341-0761
PO BOX 762, SAN FERNANDO, CA 91341-0762
PO BOX 763, SAN FERNANDO, CA 91341-0763
PO BOX 764, SAN FERNANDO, CA 91341-0764
PO BOX 765, SAN FERNANDO, CA 91341-0765
PO BOX 766, SAN FERNANDO, CA 91341-0766
PO BOX 767, SAN FERNANDO, CA 91341-0767
PO BOX 768, SAN FERNANDO, CA 91341-0768
PO BOX 769, SAN FERNANDO, CA 91341-0769
PO BOX 770, SAN FERNANDO, CA 91341-0770
PO BOX 771, SAN FERNANDO, CA 91341-0771
PO BOX 772, SAN FERNANDO, CA 91341-0772
PO BOX 773, SAN FERNANDO, CA 91341-0773
PO BOX 774, SAN FERNANDO, CA 91341-0774
PO BOX 775, SAN FERNANDO, CA 91341-0775
PO BOX 776, SAN FERNANDO, CA 91341-0776
PO BOX 777, SAN FERNANDO, CA 91341-0777
PO BOX 778, SAN FERNANDO, CA 91341-0778
PO BOX 779, SAN FERNANDO, CA 91341-0779
PO BOX 780, SAN FERNANDO, CA 91341-0780
PO BOX 781, SAN FERNANDO, CA 91341-0781
PO BOX 782, SAN FERNANDO, CA 91341-0782
PO BOX 783, SAN FERNANDO, CA 91341-0783
PO BOX 784, SAN FERNANDO, CA 91341-0784
PO BOX 785, SAN FERNANDO, CA 91341-0785
PO BOX 786, SAN FERNANDO, CA 91341-0786
PO BOX 787, SAN FERNANDO, CA 91341-0787
PO BOX 788, SAN FERNANDO, CA 91341-0788
PO BOX 789, SAN FERNANDO, CA 91341-0789
PO BOX 790, SAN FERNANDO, CA 91341-0790
PO BOX 791, SAN FERNANDO, CA 91341-0791
PO BOX 792, SAN FERNANDO, CA 91341-0792
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