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 501, CLINTON, NC 28329-0501
PO BOX 502, CLINTON, NC 28329-0502
PO BOX 503, CLINTON, NC 28329-0503
PO BOX 504, CLINTON, NC 28329-0504
PO BOX 505, CLINTON, NC 28329-0505
PO BOX 506, CLINTON, NC 28329-0506
PO BOX 507, CLINTON, NC 28329-0507
PO BOX 508, CLINTON, NC 28329-0508
PO BOX 509, CLINTON, NC 28329-0509
PO BOX 510, CLINTON, NC 28329-0510
PO BOX 511, CLINTON, NC 28329-0511
PO BOX 512, CLINTON, NC 28329-0512
PO BOX 513, CLINTON, NC 28329-0513
PO BOX 514, CLINTON, NC 28329-0514
PO BOX 515, CLINTON, NC 28329-0515
PO BOX 516, CLINTON, NC 28329-0516
PO BOX 517, CLINTON, NC 28329-0517
PO BOX 518, CLINTON, NC 28329-0518
PO BOX 519, CLINTON, NC 28329-0519
PO BOX 520, CLINTON, NC 28329-0520
PO BOX 521, CLINTON, NC 28329-0521
PO BOX 522, CLINTON, NC 28329-0522
PO BOX 523, CLINTON, NC 28329-0523
PO BOX 524, CLINTON, NC 28329-0524
PO BOX 525, CLINTON, NC 28329-0525
PO BOX 526, CLINTON, NC 28329-0526
PO BOX 527, CLINTON, NC 28329-0527
PO BOX 528, CLINTON, NC 28329-0528
PO BOX 529, CLINTON, NC 28329-0529
PO BOX 530, CLINTON, NC 28329-0530
PO BOX 531, CLINTON, NC 28329-0531
PO BOX 532, CLINTON, NC 28329-0532
PO BOX 533, CLINTON, NC 28329-0533
PO BOX 534, CLINTON, NC 28329-0534
PO BOX 535, CLINTON, NC 28329-0535
PO BOX 536, CLINTON, NC 28329-0536
PO BOX 537, CLINTON, NC 28329-0537
PO BOX 538, CLINTON, NC 28329-0538
PO BOX 539, CLINTON, NC 28329-0539
PO BOX 540, CLINTON, NC 28329-0540
PO BOX 541, CLINTON, NC 28329-0541
PO BOX 542, CLINTON, NC 28329-0542
PO BOX 543, CLINTON, NC 28329-0543
PO BOX 544, CLINTON, NC 28329-0544
PO BOX 545, CLINTON, NC 28329-0545
PO BOX 546, CLINTON, NC 28329-0546
PO BOX 547, CLINTON, NC 28329-0547
PO BOX 548, CLINTON, NC 28329-0548
PO BOX 549, CLINTON, NC 28329-0549
PO BOX 550, CLINTON, NC 28329-0550
PO BOX 551, CLINTON, NC 28329-0551
PO BOX 552, CLINTON, NC 28329-0552
PO BOX 553, CLINTON, NC 28329-0553
PO BOX 554, CLINTON, NC 28329-0554
PO BOX 555, CLINTON, NC 28329-0555
PO BOX 556, CLINTON, NC 28329-0556
PO BOX 557, CLINTON, NC 28329-0557
PO BOX 558, CLINTON, NC 28329-0558
PO BOX 559, CLINTON, NC 28329-0559
PO BOX 560, CLINTON, NC 28329-0560
PO BOX 561, CLINTON, NC 28329-0561
PO BOX 562, CLINTON, NC 28329-0562
PO BOX 563, CLINTON, NC 28329-0563
PO BOX 564, CLINTON, NC 28329-0564
PO BOX 565, CLINTON, NC 28329-0565
PO BOX 566, CLINTON, NC 28329-0566
PO BOX 567, CLINTON, NC 28329-0567
PO BOX 568, CLINTON, NC 28329-0568
PO BOX 569, CLINTON, NC 28329-0569
PO BOX 570, CLINTON, NC 28329-0570
PO BOX 571, CLINTON, NC 28329-0571
PO BOX 572, CLINTON, NC 28329-0572
PO BOX 573, CLINTON, NC 28329-0573
PO BOX 574, CLINTON, NC 28329-0574
PO BOX 575, CLINTON, NC 28329-0575
PO BOX 576, CLINTON, NC 28329-0576
PO BOX 577, CLINTON, NC 28329-0577
PO BOX 578, CLINTON, NC 28329-0578
PO BOX 579, CLINTON, NC 28329-0579
PO BOX 580, CLINTON, NC 28329-0580
PO BOX 581, CLINTON, NC 28329-0581
PO BOX 582, CLINTON, NC 28329-0582
PO BOX 583, CLINTON, NC 28329-0583
PO BOX 584, CLINTON, NC 28329-0584
PO BOX 585, CLINTON, NC 28329-0585
PO BOX 586, CLINTON, NC 28329-0586
PO BOX 587, CLINTON, NC 28329-0587
PO BOX 588, CLINTON, NC 28329-0588
PO BOX 589, CLINTON, NC 28329-0589
PO BOX 590, CLINTON, NC 28329-0590
PO BOX 591, CLINTON, NC 28329-0591
PO BOX 592, CLINTON, NC 28329-0592
PO BOX 593, CLINTON, NC 28329-0593
PO BOX 594, CLINTON, NC 28329-0594
PO BOX 595, CLINTON, NC 28329-0595
PO BOX 596, CLINTON, NC 28329-0596
PO BOX 597, CLINTON, NC 28329-0597
PO BOX 598, CLINTON, NC 28329-0598
PO BOX 599, CLINTON, NC 28329-0599
PO BOX 600, CLINTON, NC 28329-0600
PO BOX 601, CLINTON, NC 28329-0601
PO BOX 602, CLINTON, NC 28329-0602
PO BOX 603, CLINTON, NC 28329-0603
PO BOX 604, CLINTON, NC 28329-0604
PO BOX 605, CLINTON, NC 28329-0605
PO BOX 606, CLINTON, NC 28329-0606
PO BOX 607, CLINTON, NC 28329-0607
PO BOX 608, CLINTON, NC 28329-0608
PO BOX 609, CLINTON, NC 28329-0609
PO BOX 610, CLINTON, NC 28329-0610
PO BOX 611, CLINTON, NC 28329-0611
PO BOX 612, CLINTON, NC 28329-0612
PO BOX 613, CLINTON, NC 28329-0613
PO BOX 614, CLINTON, NC 28329-0614
PO BOX 615, CLINTON, NC 28329-0615
PO BOX 616, CLINTON, NC 28329-0616
PO BOX 617, CLINTON, NC 28329-0617
PO BOX 618, CLINTON, NC 28329-0618
PO BOX 619, CLINTON, NC 28329-0619
PO BOX 620, CLINTON, NC 28329-0620
PO BOX 621, CLINTON, NC 28329-0621
PO BOX 622, CLINTON, NC 28329-0622
PO BOX 623, CLINTON, NC 28329-0623
PO BOX 624, CLINTON, NC 28329-0624
PO BOX 625, CLINTON, NC 28329-0625
PO BOX 626, CLINTON, NC 28329-0626
PO BOX 627, CLINTON, NC 28329-0627
PO BOX 628, CLINTON, NC 28329-0628
PO BOX 629, CLINTON, NC 28329-0629
PO BOX 630, CLINTON, NC 28329-0630
PO BOX 631, CLINTON, NC 28329-0631
PO BOX 632, CLINTON, NC 28329-0632
PO BOX 633, CLINTON, NC 28329-0633
PO BOX 634, CLINTON, NC 28329-0634
PO BOX 635, CLINTON, NC 28329-0635
PO BOX 636, CLINTON, NC 28329-0636
PO BOX 637, CLINTON, NC 28329-0637
PO BOX 638, CLINTON, NC 28329-0638
PO BOX 639, CLINTON, NC 28329-0639
PO BOX 640, CLINTON, NC 28329-0640
PO BOX 641, CLINTON, NC 28329-0641
PO BOX 642, CLINTON, NC 28329-0642
PO BOX 643, CLINTON, NC 28329-0643
PO BOX 644, CLINTON, NC 28329-0644
PO BOX 645, CLINTON, NC 28329-0645
PO BOX 646, CLINTON, NC 28329-0646
PO BOX 647, CLINTON, NC 28329-0647
PO BOX 648, CLINTON, NC 28329-0648
PO BOX 649, CLINTON, NC 28329-0649
PO BOX 650, CLINTON, NC 28329-0650
PO BOX 651, CLINTON, NC 28329-0651
PO BOX 652, CLINTON, NC 28329-0652
PO BOX 653, CLINTON, NC 28329-0653
PO BOX 654, CLINTON, NC 28329-0654
PO BOX 655, CLINTON, NC 28329-0655
PO BOX 656, CLINTON, NC 28329-0656
PO BOX 657, CLINTON, NC 28329-0657
PO BOX 658, CLINTON, NC 28329-0658
PO BOX 659, CLINTON, NC 28329-0659
PO BOX 660, CLINTON, NC 28329-0660
PO BOX 661, CLINTON, NC 28329-0661
PO BOX 662, CLINTON, NC 28329-0662
PO BOX 663, CLINTON, NC 28329-0663
PO BOX 664, CLINTON, NC 28329-0664
PO BOX 665, CLINTON, NC 28329-0665
PO BOX 666, CLINTON, NC 28329-0666
PO BOX 667, CLINTON, NC 28329-0667
PO BOX 668, CLINTON, NC 28329-0668
PO BOX 669, CLINTON, NC 28329-0669
PO BOX 670, CLINTON, NC 28329-0670
PO BOX 671, CLINTON, NC 28329-0671
PO BOX 672, CLINTON, NC 28329-0672
PO BOX 673, CLINTON, NC 28329-0673
PO BOX 674, CLINTON, NC 28329-0674
PO BOX 675, CLINTON, NC 28329-0675
PO BOX 676, CLINTON, NC 28329-0676
PO BOX 677, CLINTON, NC 28329-0677
PO BOX 678, CLINTON, NC 28329-0678
PO BOX 679, CLINTON, NC 28329-0679
PO BOX 680, CLINTON, NC 28329-0680
PO BOX 681, CLINTON, NC 28329-0681
PO BOX 682, CLINTON, NC 28329-0682
PO BOX 683, CLINTON, NC 28329-0683
PO BOX 684, CLINTON, NC 28329-0684
PO BOX 685, CLINTON, NC 28329-0685
PO BOX 686, CLINTON, NC 28329-0686
PO BOX 687, CLINTON, NC 28329-0687
PO BOX 688, CLINTON, NC 28329-0688
PO BOX 689, CLINTON, NC 28329-0689
PO BOX 690, CLINTON, NC 28329-0690
PO BOX 691, CLINTON, NC 28329-0691
PO BOX 692, CLINTON, NC 28329-0692
PO BOX 693, CLINTON, NC 28329-0693
PO BOX 694, CLINTON, NC 28329-0694
PO BOX 695, CLINTON, NC 28329-0695
PO BOX 696, CLINTON, NC 28329-0696
PO BOX 697, CLINTON, NC 28329-0697
PO BOX 698, CLINTON, NC 28329-0698
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