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 541, CLARKTON, NC 28433-0541
PO BOX 542, CLARKTON, NC 28433-0542
PO BOX 543, CLARKTON, NC 28433-0543
PO BOX 544, CLARKTON, NC 28433-0544
PO BOX 545, CLARKTON, NC 28433-0545
PO BOX 546, CLARKTON, NC 28433-0546
PO BOX 547, CLARKTON, NC 28433-0547
PO BOX 548, CLARKTON, NC 28433-0548
PO BOX 549, CLARKTON, NC 28433-0549
PO BOX 550, CLARKTON, NC 28433-0550
PO BOX 551, CLARKTON, NC 28433-0551
PO BOX 552, CLARKTON, NC 28433-0552
PO BOX 553, CLARKTON, NC 28433-0553
PO BOX 554, CLARKTON, NC 28433-0554
PO BOX 555, CLARKTON, NC 28433-0555
PO BOX 556, CLARKTON, NC 28433-0556
PO BOX 557, CLARKTON, NC 28433-0557
PO BOX 558, CLARKTON, NC 28433-0558
PO BOX 559, CLARKTON, NC 28433-0559
PO BOX 560, CLARKTON, NC 28433-0560
PO BOX 561, CLARKTON, NC 28433-0561
PO BOX 562, CLARKTON, NC 28433-0562
PO BOX 563, CLARKTON, NC 28433-0563
PO BOX 564, CLARKTON, NC 28433-0564
PO BOX 565, CLARKTON, NC 28433-0565
PO BOX 566, CLARKTON, NC 28433-0566
PO BOX 567, CLARKTON, NC 28433-0567
PO BOX 568, CLARKTON, NC 28433-0568
PO BOX 569, CLARKTON, NC 28433-0569
PO BOX 570, CLARKTON, NC 28433-0570
PO BOX 571, CLARKTON, NC 28433-0571
PO BOX 572, CLARKTON, NC 28433-0572
PO BOX 573, CLARKTON, NC 28433-0573
PO BOX 574, CLARKTON, NC 28433-0574
PO BOX 575, CLARKTON, NC 28433-0575
PO BOX 576, CLARKTON, NC 28433-0576
PO BOX 577, CLARKTON, NC 28433-0577
PO BOX 578, CLARKTON, NC 28433-0578
PO BOX 579, CLARKTON, NC 28433-0579
PO BOX 580, CLARKTON, NC 28433-0580
PO BOX 581, CLARKTON, NC 28433-0581
PO BOX 582, CLARKTON, NC 28433-0582
PO BOX 583, CLARKTON, NC 28433-0583
PO BOX 584, CLARKTON, NC 28433-0584
PO BOX 585, CLARKTON, NC 28433-0585
PO BOX 586, CLARKTON, NC 28433-0586
PO BOX 587, CLARKTON, NC 28433-0587
PO BOX 588, CLARKTON, NC 28433-0588
PO BOX 589, CLARKTON, NC 28433-0589
PO BOX 590, CLARKTON, NC 28433-0590
PO BOX 591, CLARKTON, NC 28433-0591
PO BOX 592, CLARKTON, NC 28433-0592
PO BOX 593, CLARKTON, NC 28433-0593
PO BOX 594, CLARKTON, NC 28433-0594
PO BOX 595, CLARKTON, NC 28433-0595
PO BOX 596, CLARKTON, NC 28433-0596
PO BOX 597, CLARKTON, NC 28433-0597
PO BOX 598, CLARKTON, NC 28433-0598
PO BOX 599, CLARKTON, NC 28433-0599
PO BOX 600, CLARKTON, NC 28433-0600
PO BOX 601, CLARKTON, NC 28433-0601
PO BOX 602, CLARKTON, NC 28433-0602
PO BOX 603, CLARKTON, NC 28433-0603
PO BOX 604, CLARKTON, NC 28433-0604
PO BOX 605, CLARKTON, NC 28433-0605
PO BOX 606, CLARKTON, NC 28433-0606
PO BOX 607, CLARKTON, NC 28433-0607
PO BOX 608, CLARKTON, NC 28433-0608
PO BOX 609, CLARKTON, NC 28433-0609
PO BOX 610, CLARKTON, NC 28433-0610
PO BOX 611, CLARKTON, NC 28433-0611
PO BOX 612, CLARKTON, NC 28433-0612
PO BOX 613, CLARKTON, NC 28433-0613
PO BOX 614, CLARKTON, NC 28433-0614
PO BOX 615, CLARKTON, NC 28433-0615
PO BOX 616, CLARKTON, NC 28433-0616
PO BOX 617, CLARKTON, NC 28433-0617
PO BOX 618, CLARKTON, NC 28433-0618
PO BOX 619, CLARKTON, NC 28433-0619
PO BOX 620, CLARKTON, NC 28433-0620
PO BOX 621, CLARKTON, NC 28433-0621
PO BOX 622, CLARKTON, NC 28433-0622
PO BOX 623, CLARKTON, NC 28433-0623
PO BOX 624, CLARKTON, NC 28433-0624
PO BOX 625, CLARKTON, NC 28433-0625
PO BOX 626, CLARKTON, NC 28433-0626
PO BOX 627, CLARKTON, NC 28433-0627
PO BOX 628, CLARKTON, NC 28433-0628
PO BOX 629, CLARKTON, NC 28433-0629
PO BOX 630, CLARKTON, NC 28433-0630
PO BOX 631, CLARKTON, NC 28433-0631
PO BOX 632, CLARKTON, NC 28433-0632
PO BOX 633, CLARKTON, NC 28433-0633
PO BOX 634, CLARKTON, NC 28433-0634
PO BOX 635, CLARKTON, NC 28433-0635
PO BOX 636, CLARKTON, NC 28433-0636
PO BOX 637, CLARKTON, NC 28433-0637
PO BOX 638, CLARKTON, NC 28433-0638
PO BOX 639, CLARKTON, NC 28433-0639
PO BOX 640, CLARKTON, NC 28433-0640
PO BOX 641, CLARKTON, NC 28433-0641
PO BOX 642, CLARKTON, NC 28433-0642
PO BOX 643, CLARKTON, NC 28433-0643
PO BOX 644, CLARKTON, NC 28433-0644
PO BOX 645, CLARKTON, NC 28433-0645
PO BOX 646, CLARKTON, NC 28433-0646
PO BOX 647, CLARKTON, NC 28433-0647
PO BOX 648, CLARKTON, NC 28433-0648
PO BOX 649, CLARKTON, NC 28433-0649
PO BOX 650, CLARKTON, NC 28433-0650
PO BOX 651, CLARKTON, NC 28433-0651
PO BOX 652, CLARKTON, NC 28433-0652
PO BOX 653, CLARKTON, NC 28433-0653
PO BOX 654, CLARKTON, NC 28433-0654
PO BOX 655, CLARKTON, NC 28433-0655
PO BOX 656, CLARKTON, NC 28433-0656
PO BOX 657, CLARKTON, NC 28433-0657
PO BOX 658, CLARKTON, NC 28433-0658
PO BOX 659, CLARKTON, NC 28433-0659
PO BOX 660, CLARKTON, NC 28433-0660
PO BOX 661, CLARKTON, NC 28433-0661
PO BOX 662, CLARKTON, NC 28433-0662
PO BOX 663, CLARKTON, NC 28433-0663
PO BOX 664, CLARKTON, NC 28433-0664
PO BOX 665, CLARKTON, NC 28433-0665
PO BOX 666, CLARKTON, NC 28433-0666
PO BOX 667, CLARKTON, NC 28433-0667
PO BOX 668, CLARKTON, NC 28433-0668
PO BOX 669, CLARKTON, NC 28433-0669
PO BOX 670, CLARKTON, NC 28433-0670
PO BOX 671, CLARKTON, NC 28433-0671
PO BOX 672, CLARKTON, NC 28433-0672
PO BOX 673, CLARKTON, NC 28433-0673
PO BOX 674, CLARKTON, NC 28433-0674
PO BOX 675, CLARKTON, NC 28433-0675
PO BOX 676, CLARKTON, NC 28433-0676
PO BOX 677, CLARKTON, NC 28433-0677
PO BOX 678, CLARKTON, NC 28433-0678
PO BOX 679, CLARKTON, NC 28433-0679
PO BOX 680, CLARKTON, NC 28433-0680
PO BOX 681, CLARKTON, NC 28433-0681
PO BOX 682, CLARKTON, NC 28433-0682
PO BOX 683, CLARKTON, NC 28433-0683
PO BOX 684, CLARKTON, NC 28433-0684
PO BOX 685, CLARKTON, NC 28433-0685
PO BOX 686, CLARKTON, NC 28433-0686
PO BOX 687, CLARKTON, NC 28433-0687
PO BOX 688, CLARKTON, NC 28433-0688
PO BOX 689, CLARKTON, NC 28433-0689
PO BOX 690, CLARKTON, NC 28433-0690
PO BOX 691, CLARKTON, NC 28433-0691
PO BOX 692, CLARKTON, NC 28433-0692
PO BOX 693, CLARKTON, NC 28433-0693
PO BOX 694, CLARKTON, NC 28433-0694
PO BOX 695, CLARKTON, NC 28433-0695
PO BOX 696, CLARKTON, NC 28433-0696
PO BOX 697, CLARKTON, NC 28433-0697
PO BOX 698, CLARKTON, NC 28433-0698
PO BOX 699, CLARKTON, NC 28433-0699
PO BOX 700, CLARKTON, NC 28433-0700
PO BOX 701, CLARKTON, NC 28433-0701
PO BOX 702, CLARKTON, NC 28433-0702
PO BOX 703, CLARKTON, NC 28433-0703
PO BOX 704, CLARKTON, NC 28433-0704
PO BOX 705, CLARKTON, NC 28433-0705
PO BOX 706, CLARKTON, NC 28433-0706
PO BOX 707, CLARKTON, NC 28433-0707
PO BOX 708, CLARKTON, NC 28433-0708
PO BOX 709, CLARKTON, NC 28433-0709
PO BOX 710, CLARKTON, NC 28433-0710
PO BOX 711, CLARKTON, NC 28433-0711
PO BOX 712, CLARKTON, NC 28433-0712
PO BOX 713, CLARKTON, NC 28433-0713
PO BOX 714, CLARKTON, NC 28433-0714
PO BOX 715, CLARKTON, NC 28433-0715
PO BOX 716, CLARKTON, NC 28433-0716
PO BOX 717, CLARKTON, NC 28433-0717
PO BOX 718, CLARKTON, NC 28433-0718
PO BOX 719, CLARKTON, NC 28433-0719
PO BOX 720, CLARKTON, NC 28433-0720
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