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, ROCKINGHAM, NC 28380-0541
PO BOX 542, ROCKINGHAM, NC 28380-0542
PO BOX 543, ROCKINGHAM, NC 28380-0543
PO BOX 544, ROCKINGHAM, NC 28380-0544
PO BOX 545, ROCKINGHAM, NC 28380-0545
PO BOX 546, ROCKINGHAM, NC 28380-0546
PO BOX 547, ROCKINGHAM, NC 28380-0547
PO BOX 548, ROCKINGHAM, NC 28380-0548
PO BOX 549, ROCKINGHAM, NC 28380-0549
PO BOX 550, ROCKINGHAM, NC 28380-0550
PO BOX 551, ROCKINGHAM, NC 28380-0551
PO BOX 552, ROCKINGHAM, NC 28380-0552
PO BOX 553, ROCKINGHAM, NC 28380-0553
PO BOX 554, ROCKINGHAM, NC 28380-0554
PO BOX 555, ROCKINGHAM, NC 28380-0555
PO BOX 556, ROCKINGHAM, NC 28380-0556
PO BOX 557, ROCKINGHAM, NC 28380-0557
PO BOX 558, ROCKINGHAM, NC 28380-0558
PO BOX 559, ROCKINGHAM, NC 28380-0559
PO BOX 560, ROCKINGHAM, NC 28380-0560
PO BOX 561, ROCKINGHAM, NC 28380-0561
PO BOX 562, ROCKINGHAM, NC 28380-0562
PO BOX 563, ROCKINGHAM, NC 28380-0563
PO BOX 564, ROCKINGHAM, NC 28380-0564
PO BOX 565, ROCKINGHAM, NC 28380-0565
PO BOX 566, ROCKINGHAM, NC 28380-0566
PO BOX 567, ROCKINGHAM, NC 28380-0567
PO BOX 568, ROCKINGHAM, NC 28380-0568
PO BOX 569, ROCKINGHAM, NC 28380-0569
PO BOX 570, ROCKINGHAM, NC 28380-0570
PO BOX 571, ROCKINGHAM, NC 28380-0571
PO BOX 572, ROCKINGHAM, NC 28380-0572
PO BOX 573, ROCKINGHAM, NC 28380-0573
PO BOX 574, ROCKINGHAM, NC 28380-0574
PO BOX 575, ROCKINGHAM, NC 28380-0575
PO BOX 576, ROCKINGHAM, NC 28380-0576
PO BOX 577, ROCKINGHAM, NC 28380-0577
PO BOX 578, ROCKINGHAM, NC 28380-0578
PO BOX 579, ROCKINGHAM, NC 28380-0579
PO BOX 580, ROCKINGHAM, NC 28380-0580
PO BOX 581, ROCKINGHAM, NC 28380-0581
PO BOX 582, ROCKINGHAM, NC 28380-0582
PO BOX 583, ROCKINGHAM, NC 28380-0583
PO BOX 584, ROCKINGHAM, NC 28380-0584
PO BOX 585, ROCKINGHAM, NC 28380-0585
PO BOX 586, ROCKINGHAM, NC 28380-0586
PO BOX 587, ROCKINGHAM, NC 28380-0587
PO BOX 588, ROCKINGHAM, NC 28380-0588
PO BOX 589, ROCKINGHAM, NC 28380-0589
PO BOX 590, ROCKINGHAM, NC 28380-0590
PO BOX 591, ROCKINGHAM, NC 28380-0591
PO BOX 592, ROCKINGHAM, NC 28380-0592
PO BOX 593, ROCKINGHAM, NC 28380-0593
PO BOX 594, ROCKINGHAM, NC 28380-0594
PO BOX 595, ROCKINGHAM, NC 28380-0595
PO BOX 596, ROCKINGHAM, NC 28380-0596
PO BOX 597, ROCKINGHAM, NC 28380-0597
PO BOX 598, ROCKINGHAM, NC 28380-0598
PO BOX 599, ROCKINGHAM, NC 28380-0599
PO BOX 600, ROCKINGHAM, NC 28380-0600
PO BOX 601, ROCKINGHAM, NC 28380-0601
PO BOX 602, ROCKINGHAM, NC 28380-0602
PO BOX 603, ROCKINGHAM, NC 28380-0603
PO BOX 604, ROCKINGHAM, NC 28380-0604
PO BOX 605, ROCKINGHAM, NC 28380-0605
PO BOX 606, ROCKINGHAM, NC 28380-0606
PO BOX 607, ROCKINGHAM, NC 28380-0607
PO BOX 608, ROCKINGHAM, NC 28380-0608
PO BOX 609, ROCKINGHAM, NC 28380-0609
PO BOX 610, ROCKINGHAM, NC 28380-0610
PO BOX 611, ROCKINGHAM, NC 28380-0611
PO BOX 612, ROCKINGHAM, NC 28380-0612
PO BOX 613, ROCKINGHAM, NC 28380-0613
PO BOX 614, ROCKINGHAM, NC 28380-0614
PO BOX 615, ROCKINGHAM, NC 28380-0615
PO BOX 616, ROCKINGHAM, NC 28380-0616
PO BOX 617, ROCKINGHAM, NC 28380-0617
PO BOX 618, ROCKINGHAM, NC 28380-0618
PO BOX 619, ROCKINGHAM, NC 28380-0619
PO BOX 620, ROCKINGHAM, NC 28380-0620
PO BOX 621, ROCKINGHAM, NC 28380-0621
PO BOX 622, ROCKINGHAM, NC 28380-0622
PO BOX 623, ROCKINGHAM, NC 28380-0623
PO BOX 624, ROCKINGHAM, NC 28380-0624
PO BOX 625, ROCKINGHAM, NC 28380-0625
PO BOX 626, ROCKINGHAM, NC 28380-0626
PO BOX 627, ROCKINGHAM, NC 28380-0627
PO BOX 628, ROCKINGHAM, NC 28380-0628
PO BOX 629, ROCKINGHAM, NC 28380-0629
PO BOX 630, ROCKINGHAM, NC 28380-0630
PO BOX 631, ROCKINGHAM, NC 28380-0631
PO BOX 632, ROCKINGHAM, NC 28380-0632
PO BOX 633, ROCKINGHAM, NC 28380-0633
PO BOX 634, ROCKINGHAM, NC 28380-0634
PO BOX 635, ROCKINGHAM, NC 28380-0635
PO BOX 636, ROCKINGHAM, NC 28380-0636
PO BOX 637, ROCKINGHAM, NC 28380-0637
PO BOX 638, ROCKINGHAM, NC 28380-0638
PO BOX 639, ROCKINGHAM, NC 28380-0639
PO BOX 640, ROCKINGHAM, NC 28380-0640
PO BOX 641, ROCKINGHAM, NC 28380-0641
PO BOX 642, ROCKINGHAM, NC 28380-0642
PO BOX 643, ROCKINGHAM, NC 28380-0643
PO BOX 644, ROCKINGHAM, NC 28380-0644
PO BOX 645, ROCKINGHAM, NC 28380-0645
PO BOX 646, ROCKINGHAM, NC 28380-0646
PO BOX 647, ROCKINGHAM, NC 28380-0647
PO BOX 648, ROCKINGHAM, NC 28380-0648
PO BOX 649, ROCKINGHAM, NC 28380-0649
PO BOX 650, ROCKINGHAM, NC 28380-0650
PO BOX 651, ROCKINGHAM, NC 28380-0651
PO BOX 652, ROCKINGHAM, NC 28380-0652
PO BOX 653, ROCKINGHAM, NC 28380-0653
PO BOX 654, ROCKINGHAM, NC 28380-0654
PO BOX 655, ROCKINGHAM, NC 28380-0655
PO BOX 656, ROCKINGHAM, NC 28380-0656
PO BOX 657, ROCKINGHAM, NC 28380-0657
PO BOX 658, ROCKINGHAM, NC 28380-0658
PO BOX 659, ROCKINGHAM, NC 28380-0659
PO BOX 660, ROCKINGHAM, NC 28380-0660
PO BOX 661, ROCKINGHAM, NC 28380-0661
PO BOX 662, ROCKINGHAM, NC 28380-0662
PO BOX 663, ROCKINGHAM, NC 28380-0663
PO BOX 664, ROCKINGHAM, NC 28380-0664
PO BOX 665, ROCKINGHAM, NC 28380-0665
PO BOX 666, ROCKINGHAM, NC 28380-0666
PO BOX 667, ROCKINGHAM, NC 28380-0667
PO BOX 668, ROCKINGHAM, NC 28380-0668
PO BOX 669, ROCKINGHAM, NC 28380-0669
PO BOX 670, ROCKINGHAM, NC 28380-0670
PO BOX 671, ROCKINGHAM, NC 28380-0671
PO BOX 672, ROCKINGHAM, NC 28380-0672
PO BOX 673, ROCKINGHAM, NC 28380-0673
PO BOX 674, ROCKINGHAM, NC 28380-0674
PO BOX 675, ROCKINGHAM, NC 28380-0675
PO BOX 676, ROCKINGHAM, NC 28380-0676
PO BOX 677, ROCKINGHAM, NC 28380-0677
PO BOX 678, ROCKINGHAM, NC 28380-0678
PO BOX 679, ROCKINGHAM, NC 28380-0679
PO BOX 680, ROCKINGHAM, NC 28380-0680
PO BOX 681, ROCKINGHAM, NC 28380-0681
PO BOX 682, ROCKINGHAM, NC 28380-0682
PO BOX 683, ROCKINGHAM, NC 28380-0683
PO BOX 684, ROCKINGHAM, NC 28380-0684
PO BOX 685, ROCKINGHAM, NC 28380-0685
PO BOX 686, ROCKINGHAM, NC 28380-0686
PO BOX 687, ROCKINGHAM, NC 28380-0687
PO BOX 688, ROCKINGHAM, NC 28380-0688
PO BOX 689, ROCKINGHAM, NC 28380-0689
PO BOX 690, ROCKINGHAM, NC 28380-0690
PO BOX 691, ROCKINGHAM, NC 28380-0691
PO BOX 692, ROCKINGHAM, NC 28380-0692
PO BOX 693, ROCKINGHAM, NC 28380-0693
PO BOX 694, ROCKINGHAM, NC 28380-0694
PO BOX 695, ROCKINGHAM, NC 28380-0695
PO BOX 696, ROCKINGHAM, NC 28380-0696
PO BOX 697, ROCKINGHAM, NC 28380-0697
PO BOX 698, ROCKINGHAM, NC 28380-0698
PO BOX 699, ROCKINGHAM, NC 28380-0699
PO BOX 700, ROCKINGHAM, NC 28380-0700
PO BOX 701, ROCKINGHAM, NC 28380-0701
PO BOX 702, ROCKINGHAM, NC 28380-0702
PO BOX 703, ROCKINGHAM, NC 28380-0703
PO BOX 704, ROCKINGHAM, NC 28380-0704
PO BOX 705, ROCKINGHAM, NC 28380-0705
PO BOX 706, ROCKINGHAM, NC 28380-0706
PO BOX 707, ROCKINGHAM, NC 28380-0707
PO BOX 708, ROCKINGHAM, NC 28380-0708
PO BOX 709, ROCKINGHAM, NC 28380-0709
PO BOX 710, ROCKINGHAM, NC 28380-0710
PO BOX 711, ROCKINGHAM, NC 28380-0711
PO BOX 712, ROCKINGHAM, NC 28380-0712
PO BOX 713, ROCKINGHAM, NC 28380-0713
PO BOX 714, ROCKINGHAM, NC 28380-0714
PO BOX 715, ROCKINGHAM, NC 28380-0715
PO BOX 716, ROCKINGHAM, NC 28380-0716
PO BOX 717, ROCKINGHAM, NC 28380-0717
PO BOX 718, ROCKINGHAM, NC 28380-0718
PO BOX 719, ROCKINGHAM, NC 28380-0719
PO BOX 720, ROCKINGHAM, NC 28380-0720
PO BOX 721, ROCKINGHAM, NC 28380-0721
PO BOX 722, ROCKINGHAM, NC 28380-0722
PO BOX 723, ROCKINGHAM, NC 28380-0723
PO BOX 724, ROCKINGHAM, NC 28380-0724
PO BOX 725, ROCKINGHAM, NC 28380-0725
PO BOX 726, ROCKINGHAM, NC 28380-0726
PO BOX 727, ROCKINGHAM, NC 28380-0727
PO BOX 728, ROCKINGHAM, NC 28380-0728
PO BOX 729, ROCKINGHAM, NC 28380-0729
PO BOX 730, ROCKINGHAM, NC 28380-0730
PO BOX 731, ROCKINGHAM, NC 28380-0731
PO BOX 732, ROCKINGHAM, NC 28380-0732
PO BOX 733, ROCKINGHAM, NC 28380-0733
PO BOX 734, ROCKINGHAM, NC 28380-0734
PO BOX 735, ROCKINGHAM, NC 28380-0735
PO BOX 736, ROCKINGHAM, NC 28380-0736
PO BOX 737, ROCKINGHAM, NC 28380-0737
PO BOX 738, ROCKINGHAM, NC 28380-0738
PO BOX 739, ROCKINGHAM, NC 28380-0739
PO BOX 740, ROCKINGHAM, NC 28380-0740
PO BOX 741, ROCKINGHAM, NC 28380-0741
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