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 481, DUNN, NC 28335-0481
PO BOX 482, DUNN, NC 28335-0482
PO BOX 483, DUNN, NC 28335-0483
PO BOX 484, DUNN, NC 28335-0484
PO BOX 485, DUNN, NC 28335-0485
PO BOX 486, DUNN, NC 28335-0486
PO BOX 487, DUNN, NC 28335-0487
PO BOX 488, DUNN, NC 28335-0488
PO BOX 489, DUNN, NC 28335-0489
PO BOX 490, DUNN, NC 28335-0490
PO BOX 491, DUNN, NC 28335-0491
PO BOX 492, DUNN, NC 28335-0492
PO BOX 493, DUNN, NC 28335-0493
PO BOX 494, DUNN, NC 28335-0494
PO BOX 495, DUNN, NC 28335-0495
PO BOX 496, DUNN, NC 28335-0496
PO BOX 497, DUNN, NC 28335-0497
PO BOX 498, DUNN, NC 28335-0498
PO BOX 499, DUNN, NC 28335-0499
PO BOX 500, DUNN, NC 28335-0500
PO BOX 501, DUNN, NC 28335-0501
PO BOX 502, DUNN, NC 28335-0502
PO BOX 503, DUNN, NC 28335-0503
PO BOX 504, DUNN, NC 28335-0504
PO BOX 505, DUNN, NC 28335-0505
PO BOX 506, DUNN, NC 28335-0506
PO BOX 507, DUNN, NC 28335-0507
PO BOX 508, DUNN, NC 28335-0508
PO BOX 509, DUNN, NC 28335-0509
PO BOX 510, DUNN, NC 28335-0510
PO BOX 511, DUNN, NC 28335-0511
PO BOX 512, DUNN, NC 28335-0512
PO BOX 513, DUNN, NC 28335-0513
PO BOX 514, DUNN, NC 28335-0514
PO BOX 515, DUNN, NC 28335-0515
PO BOX 516, DUNN, NC 28335-0516
PO BOX 517, DUNN, NC 28335-0517
PO BOX 518, DUNN, NC 28335-0518
PO BOX 519, DUNN, NC 28335-0519
PO BOX 520, DUNN, NC 28335-0520
PO BOX 521, DUNN, NC 28335-0521
PO BOX 522, DUNN, NC 28335-0522
PO BOX 523, DUNN, NC 28335-0523
PO BOX 524, DUNN, NC 28335-0524
PO BOX 525, DUNN, NC 28335-0525
PO BOX 526, DUNN, NC 28335-0526
PO BOX 527, DUNN, NC 28335-0527
PO BOX 528, DUNN, NC 28335-0528
PO BOX 529, DUNN, NC 28335-0529
PO BOX 530, DUNN, NC 28335-0530
PO BOX 531, DUNN, NC 28335-0531
PO BOX 532, DUNN, NC 28335-0532
PO BOX 533, DUNN, NC 28335-0533
PO BOX 534, DUNN, NC 28335-0534
PO BOX 535, DUNN, NC 28335-0535
PO BOX 536, DUNN, NC 28335-0536
PO BOX 537, DUNN, NC 28335-0537
PO BOX 538, DUNN, NC 28335-0538
PO BOX 539, DUNN, NC 28335-0539
PO BOX 540, DUNN, NC 28335-0540
PO BOX 541, DUNN, NC 28335-0541
PO BOX 542, DUNN, NC 28335-0542
PO BOX 543, DUNN, NC 28335-0543
PO BOX 544, DUNN, NC 28335-0544
PO BOX 545, DUNN, NC 28335-0545
PO BOX 546, DUNN, NC 28335-0546
PO BOX 547, DUNN, NC 28335-0547
PO BOX 548, DUNN, NC 28335-0548
PO BOX 549, DUNN, NC 28335-0549
PO BOX 550, DUNN, NC 28335-0550
PO BOX 551, DUNN, NC 28335-0551
PO BOX 552, DUNN, NC 28335-0552
PO BOX 553, DUNN, NC 28335-0553
PO BOX 554, DUNN, NC 28335-0554
PO BOX 555, DUNN, NC 28335-0555
PO BOX 556, DUNN, NC 28335-0556
PO BOX 557, DUNN, NC 28335-0557
PO BOX 558, DUNN, NC 28335-0558
PO BOX 559, DUNN, NC 28335-0559
PO BOX 560, DUNN, NC 28335-0560
PO BOX 561, DUNN, NC 28335-0561
PO BOX 562, DUNN, NC 28335-0562
PO BOX 563, DUNN, NC 28335-0563
PO BOX 564, DUNN, NC 28335-0564
PO BOX 565, DUNN, NC 28335-0565
PO BOX 566, DUNN, NC 28335-0566
PO BOX 567, DUNN, NC 28335-0567
PO BOX 568, DUNN, NC 28335-0568
PO BOX 569, DUNN, NC 28335-0569
PO BOX 570, DUNN, NC 28335-0570
PO BOX 571, DUNN, NC 28335-0571
PO BOX 572, DUNN, NC 28335-0572
PO BOX 573, DUNN, NC 28335-0573
PO BOX 574, DUNN, NC 28335-0574
PO BOX 575, DUNN, NC 28335-0575
PO BOX 576, DUNN, NC 28335-0576
PO BOX 577, DUNN, NC 28335-0577
PO BOX 578, DUNN, NC 28335-0578
PO BOX 579, DUNN, NC 28335-0579
PO BOX 580, DUNN, NC 28335-0580
PO BOX 581, DUNN, NC 28335-0581
PO BOX 582, DUNN, NC 28335-0582
PO BOX 583, DUNN, NC 28335-0583
PO BOX 584, DUNN, NC 28335-0584
PO BOX 585, DUNN, NC 28335-0585
PO BOX 586, DUNN, NC 28335-0586
PO BOX 587, DUNN, NC 28335-0587
PO BOX 588, DUNN, NC 28335-0588
PO BOX 589, DUNN, NC 28335-0589
PO BOX 590, DUNN, NC 28335-0590
PO BOX 591, DUNN, NC 28335-0591
PO BOX 592, DUNN, NC 28335-0592
PO BOX 593, DUNN, NC 28335-0593
PO BOX 594, DUNN, NC 28335-0594
PO BOX 595, DUNN, NC 28335-0595
PO BOX 596, DUNN, NC 28335-0596
PO BOX 597, DUNN, NC 28335-0597
PO BOX 598, DUNN, NC 28335-0598
PO BOX 599, DUNN, NC 28335-0599
PO BOX 600, DUNN, NC 28335-0600
PO BOX 601, DUNN, NC 28335-0601
PO BOX 602, DUNN, NC 28335-0602
PO BOX 603, DUNN, NC 28335-0603
PO BOX 604, DUNN, NC 28335-0604
PO BOX 605, DUNN, NC 28335-0605
PO BOX 606, DUNN, NC 28335-0606
PO BOX 607, DUNN, NC 28335-0607
PO BOX 608, DUNN, NC 28335-0608
PO BOX 609, DUNN, NC 28335-0609
PO BOX 610, DUNN, NC 28335-0610
PO BOX 611, DUNN, NC 28335-0611
PO BOX 612, DUNN, NC 28335-0612
PO BOX 613, DUNN, NC 28335-0613
PO BOX 614, DUNN, NC 28335-0614
PO BOX 615, DUNN, NC 28335-0615
PO BOX 616, DUNN, NC 28335-0616
PO BOX 617, DUNN, NC 28335-0617
PO BOX 618, DUNN, NC 28335-0618
PO BOX 619, DUNN, NC 28335-0619
PO BOX 620, DUNN, NC 28335-0620
PO BOX 621, DUNN, NC 28335-0621
PO BOX 622, DUNN, NC 28335-0622
PO BOX 623, DUNN, NC 28335-0623
PO BOX 624, DUNN, NC 28335-0624
PO BOX 625, DUNN, NC 28335-0625
PO BOX 626, DUNN, NC 28335-0626
PO BOX 627, DUNN, NC 28335-0627
PO BOX 628, DUNN, NC 28335-0628
PO BOX 629, DUNN, NC 28335-0629
PO BOX 630, DUNN, NC 28335-0630
PO BOX 631, DUNN, NC 28335-0631
PO BOX 632, DUNN, NC 28335-0632
PO BOX 633, DUNN, NC 28335-0633
PO BOX 634, DUNN, NC 28335-0634
PO BOX 635, DUNN, NC 28335-0635
PO BOX 636, DUNN, NC 28335-0636
PO BOX 637, DUNN, NC 28335-0637
PO BOX 638, DUNN, NC 28335-0638
PO BOX 639, DUNN, NC 28335-0639
PO BOX 640, DUNN, NC 28335-0640
PO BOX 641, DUNN, NC 28335-0641
PO BOX 642, DUNN, NC 28335-0642
PO BOX 643, DUNN, NC 28335-0643
PO BOX 644, DUNN, NC 28335-0644
PO BOX 645, DUNN, NC 28335-0645
PO BOX 646, DUNN, NC 28335-0646
PO BOX 647, DUNN, NC 28335-0647
PO BOX 648, DUNN, NC 28335-0648
PO BOX 649, DUNN, NC 28335-0649
PO BOX 650, DUNN, NC 28335-0650
PO BOX 651, DUNN, NC 28335-0651
PO BOX 652, DUNN, NC 28335-0652
PO BOX 653, DUNN, NC 28335-0653
PO BOX 654, DUNN, NC 28335-0654
PO BOX 655, DUNN, NC 28335-0655
PO BOX 656, DUNN, NC 28335-0656
PO BOX 657, DUNN, NC 28335-0657
PO BOX 658, DUNN, NC 28335-0658
PO BOX 659, DUNN, NC 28335-0659
PO BOX 660, DUNN, NC 28335-0660
PO BOX 661, DUNN, NC 28335-0661
PO BOX 662, DUNN, NC 28335-0662
PO BOX 663, DUNN, NC 28335-0663
PO BOX 664, DUNN, NC 28335-0664
PO BOX 665, DUNN, NC 28335-0665
PO BOX 666, DUNN, NC 28335-0666
PO BOX 667, DUNN, NC 28335-0667
PO BOX 668, DUNN, NC 28335-0668
PO BOX 669, DUNN, NC 28335-0669
PO BOX 670, DUNN, NC 28335-0670
PO BOX 671, DUNN, NC 28335-0671
PO BOX 672, DUNN, NC 28335-0672
PO BOX 673, DUNN, NC 28335-0673
PO BOX 674, DUNN, NC 28335-0674
PO BOX 675, DUNN, NC 28335-0675
PO BOX 676, DUNN, NC 28335-0676
PO BOX 677, DUNN, NC 28335-0677
PO BOX 678, DUNN, NC 28335-0678
PO BOX 679, DUNN, NC 28335-0679
PO BOX 680, DUNN, NC 28335-0680
PO BOX 681, DUNN, NC 28335-0681
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