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 601, CARLSBAD, NM 88221-0601
PO BOX 602, CARLSBAD, NM 88221-0602
PO BOX 603, CARLSBAD, NM 88221-0603
PO BOX 604, CARLSBAD, NM 88221-0604
PO BOX 605, CARLSBAD, NM 88221-0605
PO BOX 606, CARLSBAD, NM 88221-0606
PO BOX 607, CARLSBAD, NM 88221-0607
PO BOX 608, CARLSBAD, NM 88221-0608
PO BOX 609, CARLSBAD, NM 88221-0609
PO BOX 610, CARLSBAD, NM 88221-0610
PO BOX 611, CARLSBAD, NM 88221-0611
PO BOX 612, CARLSBAD, NM 88221-0612
PO BOX 613, CARLSBAD, NM 88221-0613
PO BOX 614, CARLSBAD, NM 88221-0614
PO BOX 615, CARLSBAD, NM 88221-0615
PO BOX 616, CARLSBAD, NM 88221-0616
PO BOX 617, CARLSBAD, NM 88221-0617
PO BOX 618, CARLSBAD, NM 88221-0618
PO BOX 619, CARLSBAD, NM 88221-0619
PO BOX 620, CARLSBAD, NM 88221-0620
PO BOX 621, CARLSBAD, NM 88221-0621
PO BOX 622, CARLSBAD, NM 88221-0622
PO BOX 623, CARLSBAD, NM 88221-0623
PO BOX 624, CARLSBAD, NM 88221-0624
PO BOX 625, CARLSBAD, NM 88221-0625
PO BOX 626, CARLSBAD, NM 88221-0626
PO BOX 627, CARLSBAD, NM 88221-0627
PO BOX 628, CARLSBAD, NM 88221-0628
PO BOX 629, CARLSBAD, NM 88221-0629
PO BOX 630, CARLSBAD, NM 88221-0630
PO BOX 631, CARLSBAD, NM 88221-0631
PO BOX 632, CARLSBAD, NM 88221-0632
PO BOX 633, CARLSBAD, NM 88221-0633
PO BOX 634, CARLSBAD, NM 88221-0634
PO BOX 635, CARLSBAD, NM 88221-0635
PO BOX 636, CARLSBAD, NM 88221-0636
PO BOX 637, CARLSBAD, NM 88221-0637
PO BOX 638, CARLSBAD, NM 88221-0638
PO BOX 639, CARLSBAD, NM 88221-0639
PO BOX 640, CARLSBAD, NM 88221-0640
PO BOX 641, CARLSBAD, NM 88221-0641
PO BOX 642, CARLSBAD, NM 88221-0642
PO BOX 643, CARLSBAD, NM 88221-0643
PO BOX 644, CARLSBAD, NM 88221-0644
PO BOX 645, CARLSBAD, NM 88221-0645
PO BOX 646, CARLSBAD, NM 88221-0646
PO BOX 647, CARLSBAD, NM 88221-0647
PO BOX 648, CARLSBAD, NM 88221-0648
PO BOX 649, CARLSBAD, NM 88221-0649
PO BOX 650, CARLSBAD, NM 88221-0650
PO BOX 651, CARLSBAD, NM 88221-0651
PO BOX 652, CARLSBAD, NM 88221-0652
PO BOX 653, CARLSBAD, NM 88221-0653
PO BOX 654, CARLSBAD, NM 88221-0654
PO BOX 655, CARLSBAD, NM 88221-0655
PO BOX 656, CARLSBAD, NM 88221-0656
PO BOX 657, CARLSBAD, NM 88221-0657
PO BOX 658, CARLSBAD, NM 88221-0658
PO BOX 659, CARLSBAD, NM 88221-0659
PO BOX 660, CARLSBAD, NM 88221-0660
PO BOX 661, CARLSBAD, NM 88221-0661
PO BOX 662, CARLSBAD, NM 88221-0662
PO BOX 663, CARLSBAD, NM 88221-0663
PO BOX 664, CARLSBAD, NM 88221-0664
PO BOX 665, CARLSBAD, NM 88221-0665
PO BOX 666, CARLSBAD, NM 88221-0666
PO BOX 667, CARLSBAD, NM 88221-0667
PO BOX 668, CARLSBAD, NM 88221-0668
PO BOX 669, CARLSBAD, NM 88221-0669
PO BOX 670, CARLSBAD, NM 88221-0670
PO BOX 671, CARLSBAD, NM 88221-0671
PO BOX 672, CARLSBAD, NM 88221-0672
PO BOX 673, CARLSBAD, NM 88221-0673
PO BOX 674, CARLSBAD, NM 88221-0674
PO BOX 675, CARLSBAD, NM 88221-0675
PO BOX 676, CARLSBAD, NM 88221-0676
PO BOX 677, CARLSBAD, NM 88221-0677
PO BOX 678, CARLSBAD, NM 88221-0678
PO BOX 679, CARLSBAD, NM 88221-0679
PO BOX 680, CARLSBAD, NM 88221-0680
PO BOX 681, CARLSBAD, NM 88221-0681
PO BOX 682, CARLSBAD, NM 88221-0682
PO BOX 683, CARLSBAD, NM 88221-0683
PO BOX 684, CARLSBAD, NM 88221-0684
PO BOX 685, CARLSBAD, NM 88221-0685
PO BOX 686, CARLSBAD, NM 88221-0686
PO BOX 687, CARLSBAD, NM 88221-0687
PO BOX 688, CARLSBAD, NM 88221-0688
PO BOX 689, CARLSBAD, NM 88221-0689
PO BOX 690, CARLSBAD, NM 88221-0690
PO BOX 691, CARLSBAD, NM 88221-0691
PO BOX 692, CARLSBAD, NM 88221-0692
PO BOX 693, CARLSBAD, NM 88221-0693
PO BOX 694, CARLSBAD, NM 88221-0694
PO BOX 695, CARLSBAD, NM 88221-0695
PO BOX 696, CARLSBAD, NM 88221-0696
PO BOX 697, CARLSBAD, NM 88221-0697
PO BOX 698, CARLSBAD, NM 88221-0698
PO BOX 699, CARLSBAD, NM 88221-0699
PO BOX 700, CARLSBAD, NM 88221-0700
PO BOX 701, CARLSBAD, NM 88221-0701
PO BOX 702, CARLSBAD, NM 88221-0702
PO BOX 703, CARLSBAD, NM 88221-0703
PO BOX 704, CARLSBAD, NM 88221-0704
PO BOX 705, CARLSBAD, NM 88221-0705
PO BOX 706, CARLSBAD, NM 88221-0706
PO BOX 707, CARLSBAD, NM 88221-0707
PO BOX 708, CARLSBAD, NM 88221-0708
PO BOX 709, CARLSBAD, NM 88221-0709
PO BOX 710, CARLSBAD, NM 88221-0710
PO BOX 711, CARLSBAD, NM 88221-0711
PO BOX 712, CARLSBAD, NM 88221-0712
PO BOX 713, CARLSBAD, NM 88221-0713
PO BOX 714, CARLSBAD, NM 88221-0714
PO BOX 715, CARLSBAD, NM 88221-0715
PO BOX 716, CARLSBAD, NM 88221-0716
PO BOX 717, CARLSBAD, NM 88221-0717
PO BOX 718, CARLSBAD, NM 88221-0718
PO BOX 719, CARLSBAD, NM 88221-0719
PO BOX 720, CARLSBAD, NM 88221-0720
PO BOX 721, CARLSBAD, NM 88221-0721
PO BOX 722, CARLSBAD, NM 88221-0722
PO BOX 723, CARLSBAD, NM 88221-0723
PO BOX 724, CARLSBAD, NM 88221-0724
PO BOX 725, CARLSBAD, NM 88221-0725
PO BOX 726, CARLSBAD, NM 88221-0726
PO BOX 727, CARLSBAD, NM 88221-0727
PO BOX 728, CARLSBAD, NM 88221-0728
PO BOX 729, CARLSBAD, NM 88221-0729
PO BOX 730, CARLSBAD, NM 88221-0730
PO BOX 731, CARLSBAD, NM 88221-0731
PO BOX 732, CARLSBAD, NM 88221-0732
PO BOX 733, CARLSBAD, NM 88221-0733
PO BOX 734, CARLSBAD, NM 88221-0734
PO BOX 735, CARLSBAD, NM 88221-0735
PO BOX 736, CARLSBAD, NM 88221-0736
PO BOX 737, CARLSBAD, NM 88221-0737
PO BOX 738, CARLSBAD, NM 88221-0738
PO BOX 739, CARLSBAD, NM 88221-0739
PO BOX 740, CARLSBAD, NM 88221-0740
PO BOX 741, CARLSBAD, NM 88221-0741
PO BOX 742, CARLSBAD, NM 88221-0742
PO BOX 743, CARLSBAD, NM 88221-0743
PO BOX 744, CARLSBAD, NM 88221-0744
PO BOX 745, CARLSBAD, NM 88221-0745
PO BOX 746, CARLSBAD, NM 88221-0746
PO BOX 747, CARLSBAD, NM 88221-0747
PO BOX 748, CARLSBAD, NM 88221-0748
PO BOX 749, CARLSBAD, NM 88221-0749
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