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 661, IMPERIAL BEACH, CA 91933-0661
PO BOX 662, IMPERIAL BEACH, CA 91933-0662
PO BOX 663, IMPERIAL BEACH, CA 91933-0663
PO BOX 664, IMPERIAL BEACH, CA 91933-0664
PO BOX 665, IMPERIAL BEACH, CA 91933-0665
PO BOX 666, IMPERIAL BEACH, CA 91933-0666
PO BOX 667, IMPERIAL BEACH, CA 91933-0667
PO BOX 668, IMPERIAL BEACH, CA 91933-0668
PO BOX 669, IMPERIAL BEACH, CA 91933-0669
PO BOX 670, IMPERIAL BEACH, CA 91933-0670
PO BOX 671, IMPERIAL BEACH, CA 91933-0671
PO BOX 672, IMPERIAL BEACH, CA 91933-0672
PO BOX 673, IMPERIAL BEACH, CA 91933-0673
PO BOX 674, IMPERIAL BEACH, CA 91933-0674
PO BOX 675, IMPERIAL BEACH, CA 91933-0675
PO BOX 676, IMPERIAL BEACH, CA 91933-0676
PO BOX 677, IMPERIAL BEACH, CA 91933-0677
PO BOX 678, IMPERIAL BEACH, CA 91933-0678
PO BOX 679, IMPERIAL BEACH, CA 91933-0679
PO BOX 680, IMPERIAL BEACH, CA 91933-0680
PO BOX 681, IMPERIAL BEACH, CA 91933-0681
PO BOX 682, IMPERIAL BEACH, CA 91933-0682
PO BOX 683, IMPERIAL BEACH, CA 91933-0683
PO BOX 684, IMPERIAL BEACH, CA 91933-0684
PO BOX 685, IMPERIAL BEACH, CA 91933-0685
PO BOX 686, IMPERIAL BEACH, CA 91933-0686
PO BOX 687, IMPERIAL BEACH, CA 91933-0687
PO BOX 688, IMPERIAL BEACH, CA 91933-0688
PO BOX 689, IMPERIAL BEACH, CA 91933-0689
PO BOX 690, IMPERIAL BEACH, CA 91933-0690
PO BOX 691, IMPERIAL BEACH, CA 91933-0691
PO BOX 692, IMPERIAL BEACH, CA 91933-0692
PO BOX 693, IMPERIAL BEACH, CA 91933-0693
PO BOX 694, IMPERIAL BEACH, CA 91933-0694
PO BOX 695, IMPERIAL BEACH, CA 91933-0695
PO BOX 696, IMPERIAL BEACH, CA 91933-0696
PO BOX 697, IMPERIAL BEACH, CA 91933-0697
PO BOX 698, IMPERIAL BEACH, CA 91933-0698
PO BOX 699, IMPERIAL BEACH, CA 91933-0699
PO BOX 700, IMPERIAL BEACH, CA 91933-0700
PO BOX 701, IMPERIAL BEACH, CA 91933-0701
PO BOX 702, IMPERIAL BEACH, CA 91933-0702
PO BOX 703, IMPERIAL BEACH, CA 91933-0703
PO BOX 704, IMPERIAL BEACH, CA 91933-0704
PO BOX 705, IMPERIAL BEACH, CA 91933-0705
PO BOX 706, IMPERIAL BEACH, CA 91933-0706
PO BOX 707, IMPERIAL BEACH, CA 91933-0707
PO BOX 708, IMPERIAL BEACH, CA 91933-0708
PO BOX 709, IMPERIAL BEACH, CA 91933-0709
PO BOX 710, IMPERIAL BEACH, CA 91933-0710
PO BOX 711, IMPERIAL BEACH, CA 91933-0711
PO BOX 712, IMPERIAL BEACH, CA 91933-0712
PO BOX 713, IMPERIAL BEACH, CA 91933-0713
PO BOX 714, IMPERIAL BEACH, CA 91933-0714
PO BOX 715, IMPERIAL BEACH, CA 91933-0715
PO BOX 716, IMPERIAL BEACH, CA 91933-0716
PO BOX 717, IMPERIAL BEACH, CA 91933-0717
PO BOX 718, IMPERIAL BEACH, CA 91933-0718
PO BOX 719, IMPERIAL BEACH, CA 91933-0719
PO BOX 720, IMPERIAL BEACH, CA 91933-0720
PO BOX 721, IMPERIAL BEACH, CA 91933-0721
PO BOX 722, IMPERIAL BEACH, CA 91933-0722
PO BOX 723, IMPERIAL BEACH, CA 91933-0723
PO BOX 724, IMPERIAL BEACH, CA 91933-0724
PO BOX 725, IMPERIAL BEACH, CA 91933-0725
PO BOX 726, IMPERIAL BEACH, CA 91933-0726
PO BOX 727, IMPERIAL BEACH, CA 91933-0727
PO BOX 728, IMPERIAL BEACH, CA 91933-0728
PO BOX 729, IMPERIAL BEACH, CA 91933-0729
PO BOX 730, IMPERIAL BEACH, CA 91933-0730
PO BOX 731, IMPERIAL BEACH, CA 91933-0731
PO BOX 732, IMPERIAL BEACH, CA 91933-0732
PO BOX 733, IMPERIAL BEACH, CA 91933-0733
PO BOX 734, IMPERIAL BEACH, CA 91933-0734
PO BOX 735, IMPERIAL BEACH, CA 91933-0735
PO BOX 736, IMPERIAL BEACH, CA 91933-0736
PO BOX 737, IMPERIAL BEACH, CA 91933-0737
PO BOX 738, IMPERIAL BEACH, CA 91933-0738
PO BOX 739, IMPERIAL BEACH, CA 91933-0739
PO BOX 740, IMPERIAL BEACH, CA 91933-0740
PO BOX 741, IMPERIAL BEACH, CA 91933-0741
PO BOX 742, IMPERIAL BEACH, CA 91933-0742
PO BOX 743, IMPERIAL BEACH, CA 91933-0743
PO BOX 744, IMPERIAL BEACH, CA 91933-0744
PO BOX 745, IMPERIAL BEACH, CA 91933-0745
PO BOX 746, IMPERIAL BEACH, CA 91933-0746
PO BOX 747, IMPERIAL BEACH, CA 91933-0747
PO BOX 748, IMPERIAL BEACH, CA 91933-0748
PO BOX 749, IMPERIAL BEACH, CA 91933-0749
PO BOX 750, IMPERIAL BEACH, CA 91933-0750
PO BOX 751, IMPERIAL BEACH, CA 91933-0751
PO BOX 752, IMPERIAL BEACH, CA 91933-0752
PO BOX 753, IMPERIAL BEACH, CA 91933-0753
PO BOX 754, IMPERIAL BEACH, CA 91933-0754
PO BOX 755, IMPERIAL BEACH, CA 91933-0755
PO BOX 756, IMPERIAL BEACH, CA 91933-0756
PO BOX 757, IMPERIAL BEACH, CA 91933-0757
PO BOX 758, IMPERIAL BEACH, CA 91933-0758
PO BOX 759, IMPERIAL BEACH, CA 91933-0759
PO BOX 760, IMPERIAL BEACH, CA 91933-0760
PO BOX 761, IMPERIAL BEACH, CA 91933-0761
PO BOX 762, IMPERIAL BEACH, CA 91933-0762
PO BOX 763, IMPERIAL BEACH, CA 91933-0763
PO BOX 764, IMPERIAL BEACH, CA 91933-0764
PO BOX 765, IMPERIAL BEACH, CA 91933-0765
PO BOX 766, IMPERIAL BEACH, CA 91933-0766
PO BOX 767, IMPERIAL BEACH, CA 91933-0767
PO BOX 768, IMPERIAL BEACH, CA 91933-0768
PO BOX 769, IMPERIAL BEACH, CA 91933-0769
PO BOX 770, IMPERIAL BEACH, CA 91933-0770
PO BOX 771, IMPERIAL BEACH, CA 91933-0771
PO BOX 772, IMPERIAL BEACH, CA 91933-0772
PO BOX 773, IMPERIAL BEACH, CA 91933-0773
PO BOX 774, IMPERIAL BEACH, CA 91933-0774
PO BOX 775, IMPERIAL BEACH, CA 91933-0775
PO BOX 776, IMPERIAL BEACH, CA 91933-0776
PO BOX 777, IMPERIAL BEACH, CA 91933-0777
PO BOX 778, IMPERIAL BEACH, CA 91933-0778
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