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 591, VALLEY CENTER, CA 92082-0591
PO BOX 592, VALLEY CENTER, CA 92082-0592
PO BOX 593, VALLEY CENTER, CA 92082-0593
PO BOX 594, VALLEY CENTER, CA 92082-0594
PO BOX 595, VALLEY CENTER, CA 92082-0595
PO BOX 596, VALLEY CENTER, CA 92082-0596
PO BOX 597, VALLEY CENTER, CA 92082-0597
PO BOX 598, VALLEY CENTER, CA 92082-0598
PO BOX 599, VALLEY CENTER, CA 92082-0599
PO BOX 600, VALLEY CENTER, CA 92082-0600
PO BOX 601, VALLEY CENTER, CA 92082-0601
PO BOX 602, VALLEY CENTER, CA 92082-0602
PO BOX 603, VALLEY CENTER, CA 92082-0603
PO BOX 604, VALLEY CENTER, CA 92082-0604
PO BOX 605, VALLEY CENTER, CA 92082-0605
PO BOX 606, VALLEY CENTER, CA 92082-0606
PO BOX 607, VALLEY CENTER, CA 92082-0607
PO BOX 608, VALLEY CENTER, CA 92082-0608
PO BOX 609, VALLEY CENTER, CA 92082-0609
PO BOX 610, VALLEY CENTER, CA 92082-0610
PO BOX 611, VALLEY CENTER, CA 92082-0611
PO BOX 612, VALLEY CENTER, CA 92082-0612
PO BOX 613, VALLEY CENTER, CA 92082-0613
PO BOX 614, VALLEY CENTER, CA 92082-0614
PO BOX 615, VALLEY CENTER, CA 92082-0615
PO BOX 616, VALLEY CENTER, CA 92082-0616
PO BOX 617, VALLEY CENTER, CA 92082-0617
PO BOX 618, VALLEY CENTER, CA 92082-0618
PO BOX 619, VALLEY CENTER, CA 92082-0619
PO BOX 620, VALLEY CENTER, CA 92082-0620
PO BOX 621, VALLEY CENTER, CA 92082-0621
PO BOX 622, VALLEY CENTER, CA 92082-0622
PO BOX 623, VALLEY CENTER, CA 92082-0623
PO BOX 624, VALLEY CENTER, CA 92082-0624
PO BOX 625, VALLEY CENTER, CA 92082-0625
PO BOX 626, VALLEY CENTER, CA 92082-0626
PO BOX 627, VALLEY CENTER, CA 92082-0627
PO BOX 628, VALLEY CENTER, CA 92082-0628
PO BOX 629, VALLEY CENTER, CA 92082-0629
PO BOX 630, VALLEY CENTER, CA 92082-0630
PO BOX 631, VALLEY CENTER, CA 92082-0631
PO BOX 632, VALLEY CENTER, CA 92082-0632
PO BOX 633, VALLEY CENTER, CA 92082-0633
PO BOX 634, VALLEY CENTER, CA 92082-0634
PO BOX 635, VALLEY CENTER, CA 92082-0635
PO BOX 636, VALLEY CENTER, CA 92082-0636
PO BOX 637, VALLEY CENTER, CA 92082-0637
PO BOX 638, VALLEY CENTER, CA 92082-0638
PO BOX 639, VALLEY CENTER, CA 92082-0639
PO BOX 640, VALLEY CENTER, CA 92082-0640
PO BOX 641, VALLEY CENTER, CA 92082-0641
PO BOX 642, VALLEY CENTER, CA 92082-0642
PO BOX 643, VALLEY CENTER, CA 92082-0643
PO BOX 644, VALLEY CENTER, CA 92082-0644
PO BOX 645, VALLEY CENTER, CA 92082-0645
PO BOX 646, VALLEY CENTER, CA 92082-0646
PO BOX 647, VALLEY CENTER, CA 92082-0647
PO BOX 648, VALLEY CENTER, CA 92082-0648
PO BOX 649, VALLEY CENTER, CA 92082-0649
PO BOX 650, VALLEY CENTER, CA 92082-0650
PO BOX 651, VALLEY CENTER, CA 92082-0651
PO BOX 652, VALLEY CENTER, CA 92082-0652
PO BOX 653, VALLEY CENTER, CA 92082-0653
PO BOX 654, VALLEY CENTER, CA 92082-0654
PO BOX 655, VALLEY CENTER, CA 92082-0655
PO BOX 656, VALLEY CENTER, CA 92082-0656
PO BOX 657, VALLEY CENTER, CA 92082-0657
PO BOX 658, VALLEY CENTER, CA 92082-0658
PO BOX 659, VALLEY CENTER, CA 92082-0659
PO BOX 660, VALLEY CENTER, CA 92082-0660
PO BOX 661, VALLEY CENTER, CA 92082-0661
PO BOX 662, VALLEY CENTER, CA 92082-0662
PO BOX 663, VALLEY CENTER, CA 92082-0663
PO BOX 664, VALLEY CENTER, CA 92082-0664
PO BOX 665, VALLEY CENTER, CA 92082-0665
PO BOX 666, VALLEY CENTER, CA 92082-0666
PO BOX 667, VALLEY CENTER, CA 92082-0667
PO BOX 668, VALLEY CENTER, CA 92082-0668
PO BOX 669, VALLEY CENTER, CA 92082-0669
PO BOX 670, VALLEY CENTER, CA 92082-0670
PO BOX 671, VALLEY CENTER, CA 92082-0671
PO BOX 672, VALLEY CENTER, CA 92082-0672
PO BOX 673, VALLEY CENTER, CA 92082-0673
PO BOX 674, VALLEY CENTER, CA 92082-0674
PO BOX 675, VALLEY CENTER, CA 92082-0675
PO BOX 676, VALLEY CENTER, CA 92082-0676
PO BOX 677, VALLEY CENTER, CA 92082-0677
PO BOX 678, VALLEY CENTER, CA 92082-0678
PO BOX 679, VALLEY CENTER, CA 92082-0679
PO BOX 680, VALLEY CENTER, CA 92082-0680
PO BOX 681, VALLEY CENTER, CA 92082-0681
PO BOX 682, VALLEY CENTER, CA 92082-0682
PO BOX 683, VALLEY CENTER, CA 92082-0683
PO BOX 684, VALLEY CENTER, CA 92082-0684
PO BOX 685, VALLEY CENTER, CA 92082-0685
PO BOX 686, VALLEY CENTER, CA 92082-0686
PO BOX 687, VALLEY CENTER, CA 92082-0687
PO BOX 688, VALLEY CENTER, CA 92082-0688
PO BOX 689, VALLEY CENTER, CA 92082-0689
PO BOX 690, VALLEY CENTER, CA 92082-0690
PO BOX 691, VALLEY CENTER, CA 92082-0691
PO BOX 692, VALLEY CENTER, CA 92082-0692
PO BOX 693, VALLEY CENTER, CA 92082-0693
PO BOX 694, VALLEY CENTER, CA 92082-0694
PO BOX 695, VALLEY CENTER, CA 92082-0695
PO BOX 696, VALLEY CENTER, CA 92082-0696
PO BOX 697, VALLEY CENTER, CA 92082-0697
PO BOX 698, VALLEY CENTER, CA 92082-0698
PO BOX 699, VALLEY CENTER, CA 92082-0699
PO BOX 700, VALLEY CENTER, CA 92082-0700
PO BOX 701, VALLEY CENTER, CA 92082-0701
PO BOX 702, VALLEY CENTER, CA 92082-0702
PO BOX 703, VALLEY CENTER, CA 92082-0703
PO BOX 704, VALLEY CENTER, CA 92082-0704
PO BOX 705, VALLEY CENTER, CA 92082-0705
PO BOX 706, VALLEY CENTER, CA 92082-0706
PO BOX 707, VALLEY CENTER, CA 92082-0707
PO BOX 708, VALLEY CENTER, CA 92082-0708
PO BOX 709, VALLEY CENTER, CA 92082-0709
PO BOX 710, VALLEY CENTER, CA 92082-0710
PO BOX 711, VALLEY CENTER, CA 92082-0711
PO BOX 712, VALLEY CENTER, CA 92082-0712
PO BOX 713, VALLEY CENTER, CA 92082-0713
PO BOX 714, VALLEY CENTER, CA 92082-0714
PO BOX 715, VALLEY CENTER, CA 92082-0715
PO BOX 716, VALLEY CENTER, CA 92082-0716
PO BOX 717, VALLEY CENTER, CA 92082-0717
PO BOX 718, VALLEY CENTER, CA 92082-0718
PO BOX 719, VALLEY CENTER, CA 92082-0719
PO BOX 720, VALLEY CENTER, CA 92082-0720
PO BOX 721, VALLEY CENTER, CA 92082-0721
PO BOX 722, VALLEY CENTER, CA 92082-0722
PO BOX 723, VALLEY CENTER, CA 92082-0723
PO BOX 724, VALLEY CENTER, CA 92082-0724
PO BOX 725, VALLEY CENTER, CA 92082-0725
PO BOX 726, VALLEY CENTER, CA 92082-0726
PO BOX 727, VALLEY CENTER, CA 92082-0727
PO BOX 728, VALLEY CENTER, CA 92082-0728
PO BOX 729, VALLEY CENTER, CA 92082-0729
PO BOX 730, VALLEY CENTER, CA 92082-0730
PO BOX 731, VALLEY CENTER, CA 92082-0731
PO BOX 732, VALLEY CENTER, CA 92082-0732
PO BOX 733, VALLEY CENTER, CA 92082-0733
PO BOX 734, VALLEY CENTER, CA 92082-0734
PO BOX 735, VALLEY CENTER, CA 92082-0735
PO BOX 736, VALLEY CENTER, CA 92082-0736
PO BOX 737, VALLEY CENTER, CA 92082-0737
PO BOX 738, VALLEY CENTER, CA 92082-0738
PO BOX 739, VALLEY CENTER, CA 92082-0739
PO BOX 740, VALLEY CENTER, CA 92082-0740
PO BOX 741, VALLEY CENTER, CA 92082-0741
PO BOX 742, VALLEY CENTER, CA 92082-0742
PO BOX 743, VALLEY CENTER, CA 92082-0743
PO BOX 744, VALLEY CENTER, CA 92082-0744
PO BOX 745, VALLEY CENTER, CA 92082-0745
PO BOX 746, VALLEY CENTER, CA 92082-0746
PO BOX 747, VALLEY CENTER, CA 92082-0747
PO BOX 748, VALLEY CENTER, CA 92082-0748
PO BOX 749, VALLEY CENTER, CA 92082-0749
PO BOX 750, VALLEY CENTER, CA 92082-0750
PO BOX 751, VALLEY CENTER, CA 92082-0751
PO BOX 752, VALLEY CENTER, CA 92082-0752
PO BOX 753, VALLEY CENTER, CA 92082-0753
PO BOX 754, VALLEY CENTER, CA 92082-0754
PO BOX 755, VALLEY CENTER, CA 92082-0755
PO BOX 756, VALLEY CENTER, CA 92082-0756
PO BOX 757, VALLEY CENTER, CA 92082-0757
PO BOX 758, VALLEY CENTER, CA 92082-0758
PO BOX 759, VALLEY CENTER, CA 92082-0759
PO BOX 760, VALLEY CENTER, CA 92082-0760
PO BOX 761, VALLEY CENTER, CA 92082-0761
PO BOX 762, VALLEY CENTER, CA 92082-0762
PO BOX 763, VALLEY CENTER, CA 92082-0763
PO BOX 764, VALLEY CENTER, CA 92082-0764
PO BOX 765, VALLEY CENTER, CA 92082-0765
PO BOX 766, VALLEY CENTER, CA 92082-0766
PO BOX 767, VALLEY CENTER, CA 92082-0767
PO BOX 768, VALLEY CENTER, CA 92082-0768
PO BOX 769, VALLEY CENTER, CA 92082-0769
PO BOX 770, VALLEY CENTER, CA 92082-0770
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