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 451, JACKSONVILLE, NC 28541-0451
PO BOX 452, JACKSONVILLE, NC 28541-0452
PO BOX 453, JACKSONVILLE, NC 28541-0453
PO BOX 454, JACKSONVILLE, NC 28541-0454
PO BOX 455, JACKSONVILLE, NC 28541-0455
PO BOX 456, JACKSONVILLE, NC 28541-0456
PO BOX 457, JACKSONVILLE, NC 28541-0457
PO BOX 458, JACKSONVILLE, NC 28541-0458
PO BOX 459, JACKSONVILLE, NC 28541-0459
PO BOX 460, JACKSONVILLE, NC 28541-0460
PO BOX 461, JACKSONVILLE, NC 28541-0461
PO BOX 462, JACKSONVILLE, NC 28541-0462
PO BOX 463, JACKSONVILLE, NC 28541-0463
PO BOX 464, JACKSONVILLE, NC 28541-0464
PO BOX 465, JACKSONVILLE, NC 28541-0465
PO BOX 466, JACKSONVILLE, NC 28541-0466
PO BOX 467, JACKSONVILLE, NC 28541-0467
PO BOX 468, JACKSONVILLE, NC 28541-0468
PO BOX 469, JACKSONVILLE, NC 28541-0469
PO BOX 470, JACKSONVILLE, NC 28541-0470
PO BOX 471, JACKSONVILLE, NC 28541-0471
PO BOX 472, JACKSONVILLE, NC 28541-0472
PO BOX 473, JACKSONVILLE, NC 28541-0473
PO BOX 474, JACKSONVILLE, NC 28541-0474
PO BOX 475, JACKSONVILLE, NC 28541-0475
PO BOX 476, JACKSONVILLE, NC 28541-0476
PO BOX 477, JACKSONVILLE, NC 28541-0477
PO BOX 478, JACKSONVILLE, NC 28541-0478
PO BOX 479, JACKSONVILLE, NC 28541-0479
PO BOX 480, JACKSONVILLE, NC 28541-0480
PO BOX 481, JACKSONVILLE, NC 28541-0481
PO BOX 482, JACKSONVILLE, NC 28541-0482
PO BOX 483, JACKSONVILLE, NC 28541-0483
PO BOX 484, JACKSONVILLE, NC 28541-0484
PO BOX 485, JACKSONVILLE, NC 28541-0485
PO BOX 486, JACKSONVILLE, NC 28541-0486
PO BOX 487, JACKSONVILLE, NC 28541-0487
PO BOX 488, JACKSONVILLE, NC 28541-0488
PO BOX 489, JACKSONVILLE, NC 28541-0489
PO BOX 490, JACKSONVILLE, NC 28541-0490
PO BOX 491, JACKSONVILLE, NC 28541-0491
PO BOX 492, JACKSONVILLE, NC 28541-0492
PO BOX 493, JACKSONVILLE, NC 28541-0493
PO BOX 494, JACKSONVILLE, NC 28541-0494
PO BOX 495, JACKSONVILLE, NC 28541-0495
PO BOX 496, JACKSONVILLE, NC 28541-0496
PO BOX 497, JACKSONVILLE, NC 28541-0497
PO BOX 498, JACKSONVILLE, NC 28541-0498
PO BOX 499, JACKSONVILLE, NC 28541-0499
PO BOX 500, JACKSONVILLE, NC 28541-0500
PO BOX 501, JACKSONVILLE, NC 28541-0501
PO BOX 502, JACKSONVILLE, NC 28541-0502
PO BOX 503, JACKSONVILLE, NC 28541-0503
PO BOX 504, JACKSONVILLE, NC 28541-0504
PO BOX 505, JACKSONVILLE, NC 28541-0505
PO BOX 506, JACKSONVILLE, NC 28541-0506
PO BOX 507, JACKSONVILLE, NC 28541-0507
PO BOX 508, JACKSONVILLE, NC 28541-0508
PO BOX 509, JACKSONVILLE, NC 28541-0509
PO BOX 510, JACKSONVILLE, NC 28541-0510
PO BOX 511, JACKSONVILLE, NC 28541-0511
PO BOX 512, JACKSONVILLE, NC 28541-0512
PO BOX 513, JACKSONVILLE, NC 28541-0513
PO BOX 514, JACKSONVILLE, NC 28541-0514
PO BOX 515, JACKSONVILLE, NC 28541-0515
PO BOX 516, JACKSONVILLE, NC 28541-0516
PO BOX 517, JACKSONVILLE, NC 28541-0517
PO BOX 518, JACKSONVILLE, NC 28541-0518
PO BOX 519, JACKSONVILLE, NC 28541-0519
PO BOX 520, JACKSONVILLE, NC 28541-0520
PO BOX 521, JACKSONVILLE, NC 28541-0521
PO BOX 522, JACKSONVILLE, NC 28541-0522
PO BOX 523, JACKSONVILLE, NC 28541-0523
PO BOX 524, JACKSONVILLE, NC 28541-0524
PO BOX 525, JACKSONVILLE, NC 28541-0525
PO BOX 526, JACKSONVILLE, NC 28541-0526
PO BOX 527, JACKSONVILLE, NC 28541-0527
PO BOX 528, JACKSONVILLE, NC 28541-0528
PO BOX 529, JACKSONVILLE, NC 28541-0529
PO BOX 530, JACKSONVILLE, NC 28541-0530
PO BOX 531, JACKSONVILLE, NC 28541-0531
PO BOX 532, JACKSONVILLE, NC 28541-0532
PO BOX 533, JACKSONVILLE, NC 28541-0533
PO BOX 534, JACKSONVILLE, NC 28541-0534
PO BOX 535, JACKSONVILLE, NC 28541-0535
PO BOX 536, JACKSONVILLE, NC 28541-0536
PO BOX 537, JACKSONVILLE, NC 28541-0537
PO BOX 538, JACKSONVILLE, NC 28541-0538
PO BOX 539, JACKSONVILLE, NC 28541-0539
PO BOX 540, JACKSONVILLE, NC 28541-0540
PO BOX 541, JACKSONVILLE, NC 28541-0541
PO BOX 542, JACKSONVILLE, NC 28541-0542
PO BOX 543, JACKSONVILLE, NC 28541-0543
PO BOX 544, JACKSONVILLE, NC 28541-0544
PO BOX 545, JACKSONVILLE, NC 28541-0545
PO BOX 546, JACKSONVILLE, NC 28541-0546
PO BOX 547, JACKSONVILLE, NC 28541-0547
PO BOX 548, JACKSONVILLE, NC 28541-0548
PO BOX 549, JACKSONVILLE, NC 28541-0549
PO BOX 550, JACKSONVILLE, NC 28541-0550
PO BOX 551, JACKSONVILLE, NC 28541-0551
PO BOX 552, JACKSONVILLE, NC 28541-0552
PO BOX 553, JACKSONVILLE, NC 28541-0553
PO BOX 554, JACKSONVILLE, NC 28541-0554
PO BOX 555, JACKSONVILLE, NC 28541-0555
PO BOX 556, JACKSONVILLE, NC 28541-0556
PO BOX 557, JACKSONVILLE, NC 28541-0557
PO BOX 558, JACKSONVILLE, NC 28541-0558
PO BOX 559, JACKSONVILLE, NC 28541-0559
PO BOX 560, JACKSONVILLE, NC 28541-0560
PO BOX 561, JACKSONVILLE, NC 28541-0561
PO BOX 562, JACKSONVILLE, NC 28541-0562
PO BOX 563, JACKSONVILLE, NC 28541-0563
PO BOX 564, JACKSONVILLE, NC 28541-0564
PO BOX 565, JACKSONVILLE, NC 28541-0565
PO BOX 566, JACKSONVILLE, NC 28541-0566
PO BOX 567, JACKSONVILLE, NC 28541-0567
PO BOX 568, JACKSONVILLE, NC 28541-0568
PO BOX 569, JACKSONVILLE, NC 28541-0569
PO BOX 570, JACKSONVILLE, NC 28541-0570
PO BOX 571, JACKSONVILLE, NC 28541-0571
PO BOX 572, JACKSONVILLE, NC 28541-0572
PO BOX 573, JACKSONVILLE, NC 28541-0573
PO BOX 574, JACKSONVILLE, NC 28541-0574
PO BOX 575, JACKSONVILLE, NC 28541-0575
PO BOX 576, JACKSONVILLE, NC 28541-0576
PO BOX 577, JACKSONVILLE, NC 28541-0577
PO BOX 578, JACKSONVILLE, NC 28541-0578
PO BOX 579, JACKSONVILLE, NC 28541-0579
PO BOX 580, JACKSONVILLE, NC 28541-0580
PO BOX 581, JACKSONVILLE, NC 28541-0581
PO BOX 582, JACKSONVILLE, NC 28541-0582
PO BOX 583, JACKSONVILLE, NC 28541-0583
PO BOX 584, JACKSONVILLE, NC 28541-0584
PO BOX 585, JACKSONVILLE, NC 28541-0585
PO BOX 586, JACKSONVILLE, NC 28541-0586
PO BOX 587, JACKSONVILLE, NC 28541-0587
PO BOX 588, JACKSONVILLE, NC 28541-0588
PO BOX 589, JACKSONVILLE, NC 28541-0589
PO BOX 590, JACKSONVILLE, NC 28541-0590
PO BOX 591, JACKSONVILLE, NC 28541-0591
PO BOX 592, JACKSONVILLE, NC 28541-0592
PO BOX 593, JACKSONVILLE, NC 28541-0593
PO BOX 594, JACKSONVILLE, NC 28541-0594
PO BOX 595, JACKSONVILLE, NC 28541-0595
PO BOX 596, JACKSONVILLE, NC 28541-0596
PO BOX 597, JACKSONVILLE, NC 28541-0597
PO BOX 598, JACKSONVILLE, NC 28541-0598
PO BOX 599, JACKSONVILLE, NC 28541-0599
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