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, SWANSBORO, NC 28584-0481
PO BOX 482, SWANSBORO, NC 28584-0482
PO BOX 483, SWANSBORO, NC 28584-0483
PO BOX 484, SWANSBORO, NC 28584-0484
PO BOX 485, SWANSBORO, NC 28584-0485
PO BOX 486, SWANSBORO, NC 28584-0486
PO BOX 487, SWANSBORO, NC 28584-0487
PO BOX 488, SWANSBORO, NC 28584-0488
PO BOX 489, SWANSBORO, NC 28584-0489
PO BOX 490, SWANSBORO, NC 28584-0490
PO BOX 491, SWANSBORO, NC 28584-0491
PO BOX 492, SWANSBORO, NC 28584-0492
PO BOX 493, SWANSBORO, NC 28584-0493
PO BOX 494, SWANSBORO, NC 28584-0494
PO BOX 495, SWANSBORO, NC 28584-0495
PO BOX 496, SWANSBORO, NC 28584-0496
PO BOX 497, SWANSBORO, NC 28584-0497
PO BOX 498, SWANSBORO, NC 28584-0498
PO BOX 499, SWANSBORO, NC 28584-0499
PO BOX 500, SWANSBORO, NC 28584-0500
PO BOX 501, SWANSBORO, NC 28584-0501
PO BOX 502, SWANSBORO, NC 28584-0502
PO BOX 503, SWANSBORO, NC 28584-0503
PO BOX 504, SWANSBORO, NC 28584-0504
PO BOX 505, SWANSBORO, NC 28584-0505
PO BOX 506, SWANSBORO, NC 28584-0506
PO BOX 507, SWANSBORO, NC 28584-0507
PO BOX 508, SWANSBORO, NC 28584-0508
PO BOX 509, SWANSBORO, NC 28584-0509
PO BOX 510, SWANSBORO, NC 28584-0510
PO BOX 511, SWANSBORO, NC 28584-0511
PO BOX 512, SWANSBORO, NC 28584-0512
PO BOX 513, SWANSBORO, NC 28584-0513
PO BOX 514, SWANSBORO, NC 28584-0514
PO BOX 515, SWANSBORO, NC 28584-0515
PO BOX 516, SWANSBORO, NC 28584-0516
PO BOX 517, SWANSBORO, NC 28584-0517
PO BOX 518, SWANSBORO, NC 28584-0518
PO BOX 519, SWANSBORO, NC 28584-0519
PO BOX 520, SWANSBORO, NC 28584-0520
PO BOX 521, SWANSBORO, NC 28584-0521
PO BOX 522, SWANSBORO, NC 28584-0522
PO BOX 523, SWANSBORO, NC 28584-0523
PO BOX 524, SWANSBORO, NC 28584-0524
PO BOX 525, SWANSBORO, NC 28584-0525
PO BOX 526, SWANSBORO, NC 28584-0526
PO BOX 527, SWANSBORO, NC 28584-0527
PO BOX 528, SWANSBORO, NC 28584-0528
PO BOX 529, SWANSBORO, NC 28584-0529
PO BOX 530, SWANSBORO, NC 28584-0530
PO BOX 531, SWANSBORO, NC 28584-0531
PO BOX 532, SWANSBORO, NC 28584-0532
PO BOX 533, SWANSBORO, NC 28584-0533
PO BOX 534, SWANSBORO, NC 28584-0534
PO BOX 535, SWANSBORO, NC 28584-0535
PO BOX 536, SWANSBORO, NC 28584-0536
PO BOX 537, SWANSBORO, NC 28584-0537
PO BOX 538, SWANSBORO, NC 28584-0538
PO BOX 539, SWANSBORO, NC 28584-0539
PO BOX 540, SWANSBORO, NC 28584-0540
PO BOX 541, SWANSBORO, NC 28584-0541
PO BOX 542, SWANSBORO, NC 28584-0542
PO BOX 543, SWANSBORO, NC 28584-0543
PO BOX 544, SWANSBORO, NC 28584-0544
PO BOX 545, SWANSBORO, NC 28584-0545
PO BOX 546, SWANSBORO, NC 28584-0546
PO BOX 547, SWANSBORO, NC 28584-0547
PO BOX 548, SWANSBORO, NC 28584-0548
PO BOX 549, SWANSBORO, NC 28584-0549
PO BOX 550, SWANSBORO, NC 28584-0550
PO BOX 551, SWANSBORO, NC 28584-0551
PO BOX 552, SWANSBORO, NC 28584-0552
PO BOX 553, SWANSBORO, NC 28584-0553
PO BOX 554, SWANSBORO, NC 28584-0554
PO BOX 555, SWANSBORO, NC 28584-0555
PO BOX 556, SWANSBORO, NC 28584-0556
PO BOX 557, SWANSBORO, NC 28584-0557
PO BOX 558, SWANSBORO, NC 28584-0558
PO BOX 559, SWANSBORO, NC 28584-0559
PO BOX 560, SWANSBORO, NC 28584-0560
PO BOX 561, SWANSBORO, NC 28584-0561
PO BOX 562, SWANSBORO, NC 28584-0562
PO BOX 563, SWANSBORO, NC 28584-0563
PO BOX 564, SWANSBORO, NC 28584-0564
PO BOX 565, SWANSBORO, NC 28584-0565
PO BOX 566, SWANSBORO, NC 28584-0566
PO BOX 567, SWANSBORO, NC 28584-0567
PO BOX 568, SWANSBORO, NC 28584-0568
PO BOX 569, SWANSBORO, NC 28584-0569
PO BOX 570, SWANSBORO, NC 28584-0570
PO BOX 571, SWANSBORO, NC 28584-0571
PO BOX 572, SWANSBORO, NC 28584-0572
PO BOX 573, SWANSBORO, NC 28584-0573
PO BOX 574, SWANSBORO, NC 28584-0574
PO BOX 575, SWANSBORO, NC 28584-0575
PO BOX 576, SWANSBORO, NC 28584-0576
PO BOX 577, SWANSBORO, NC 28584-0577
PO BOX 578, SWANSBORO, NC 28584-0578
PO BOX 579, SWANSBORO, NC 28584-0579
PO BOX 580, SWANSBORO, NC 28584-0580
PO BOX 581, SWANSBORO, NC 28584-0581
PO BOX 582, SWANSBORO, NC 28584-0582
PO BOX 583, SWANSBORO, NC 28584-0583
PO BOX 584, SWANSBORO, NC 28584-0584
PO BOX 585, SWANSBORO, NC 28584-0585
PO BOX 586, SWANSBORO, NC 28584-0586
PO BOX 587, SWANSBORO, NC 28584-0587
PO BOX 588, SWANSBORO, NC 28584-0588
PO BOX 589, SWANSBORO, NC 28584-0589
PO BOX 590, SWANSBORO, NC 28584-0590
PO BOX 591, SWANSBORO, NC 28584-0591
PO BOX 592, SWANSBORO, NC 28584-0592
PO BOX 593, SWANSBORO, NC 28584-0593
PO BOX 594, SWANSBORO, NC 28584-0594
PO BOX 595, SWANSBORO, NC 28584-0595
PO BOX 596, SWANSBORO, NC 28584-0596
PO BOX 597, SWANSBORO, NC 28584-0597
PO BOX 598, SWANSBORO, NC 28584-0598
PO BOX 599, SWANSBORO, NC 28584-0599
PO BOX 600, SWANSBORO, NC 28584-0600
PO BOX 601, SWANSBORO, NC 28584-0601
PO BOX 602, SWANSBORO, NC 28584-0602
PO BOX 603, SWANSBORO, NC 28584-0603
PO BOX 604, SWANSBORO, NC 28584-0604
PO BOX 605, SWANSBORO, NC 28584-0605
PO BOX 606, SWANSBORO, NC 28584-0606
PO BOX 607, SWANSBORO, NC 28584-0607
PO BOX 608, SWANSBORO, NC 28584-0608
PO BOX 609, SWANSBORO, NC 28584-0609
PO BOX 610, SWANSBORO, NC 28584-0610
PO BOX 611, SWANSBORO, NC 28584-0611
PO BOX 612, SWANSBORO, NC 28584-0612
PO BOX 613, SWANSBORO, NC 28584-0613
PO BOX 614, SWANSBORO, NC 28584-0614
PO BOX 615, SWANSBORO, NC 28584-0615
PO BOX 616, SWANSBORO, NC 28584-0616
PO BOX 617, SWANSBORO, NC 28584-0617
PO BOX 618, SWANSBORO, NC 28584-0618
PO BOX 619, SWANSBORO, NC 28584-0619
PO BOX 620, SWANSBORO, NC 28584-0620
PO BOX 621, SWANSBORO, NC 28584-0621
PO BOX 622, SWANSBORO, NC 28584-0622
PO BOX 623, SWANSBORO, NC 28584-0623
PO BOX 624, SWANSBORO, NC 28584-0624
PO BOX 625, SWANSBORO, NC 28584-0625
PO BOX 626, SWANSBORO, NC 28584-0626
PO BOX 627, SWANSBORO, NC 28584-0627
PO BOX 628, SWANSBORO, NC 28584-0628
PO BOX 629, SWANSBORO, NC 28584-0629
PO BOX 630, SWANSBORO, NC 28584-0630
PO BOX 631, SWANSBORO, NC 28584-0631
PO BOX 632, SWANSBORO, NC 28584-0632
PO BOX 633, SWANSBORO, NC 28584-0633
PO BOX 634, SWANSBORO, NC 28584-0634
PO BOX 635, SWANSBORO, NC 28584-0635
PO BOX 636, SWANSBORO, NC 28584-0636
PO BOX 637, SWANSBORO, NC 28584-0637
PO BOX 638, SWANSBORO, NC 28584-0638
PO BOX 639, SWANSBORO, NC 28584-0639
PO BOX 640, SWANSBORO, NC 28584-0640
PO BOX 641, SWANSBORO, NC 28584-0641
PO BOX 642, SWANSBORO, NC 28584-0642
PO BOX 643, SWANSBORO, NC 28584-0643
PO BOX 644, SWANSBORO, NC 28584-0644
PO BOX 645, SWANSBORO, NC 28584-0645
PO BOX 646, SWANSBORO, NC 28584-0646
PO BOX 647, SWANSBORO, NC 28584-0647
PO BOX 648, SWANSBORO, NC 28584-0648
PO BOX 649, SWANSBORO, NC 28584-0649
PO BOX 650, SWANSBORO, NC 28584-0650
PO BOX 651, SWANSBORO, NC 28584-0651
PO BOX 652, SWANSBORO, NC 28584-0652
PO BOX 653, SWANSBORO, NC 28584-0653
PO BOX 654, SWANSBORO, NC 28584-0654
PO BOX 655, SWANSBORO, NC 28584-0655
PO BOX 656, SWANSBORO, NC 28584-0656
PO BOX 657, SWANSBORO, NC 28584-0657
PO BOX 658, SWANSBORO, NC 28584-0658
PO BOX 659, SWANSBORO, NC 28584-0659
PO BOX 660, SWANSBORO, NC 28584-0660
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