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, SPARTANBURG, SC 29304-0501
PO BOX 502, SPARTANBURG, SC 29304-0502
PO BOX 503, SPARTANBURG, SC 29304-0503
PO BOX 504, SPARTANBURG, SC 29304-0504
PO BOX 505, SPARTANBURG, SC 29304-0505
PO BOX 506, SPARTANBURG, SC 29304-0506
PO BOX 507, SPARTANBURG, SC 29304-0507
PO BOX 508, SPARTANBURG, SC 29304-0508
PO BOX 509, SPARTANBURG, SC 29304-0509
PO BOX 510, SPARTANBURG, SC 29304-0510
PO BOX 511, SPARTANBURG, SC 29304-0511
PO BOX 512, SPARTANBURG, SC 29304-0512
PO BOX 513, SPARTANBURG, SC 29304-0513
PO BOX 514, SPARTANBURG, SC 29304-0514
PO BOX 515, SPARTANBURG, SC 29304-0515
PO BOX 516, SPARTANBURG, SC 29304-0516
PO BOX 517, SPARTANBURG, SC 29304-0517
PO BOX 518, SPARTANBURG, SC 29304-0518
PO BOX 519, SPARTANBURG, SC 29304-0519
PO BOX 520, SPARTANBURG, SC 29304-0520
PO BOX 521, SPARTANBURG, SC 29304-0521
PO BOX 522, SPARTANBURG, SC 29304-0522
PO BOX 523, SPARTANBURG, SC 29304-0523
PO BOX 524, SPARTANBURG, SC 29304-0524
PO BOX 525, SPARTANBURG, SC 29304-0525
PO BOX 526, SPARTANBURG, SC 29304-0526
PO BOX 527, SPARTANBURG, SC 29304-0527
PO BOX 528, SPARTANBURG, SC 29304-0528
PO BOX 529, SPARTANBURG, SC 29304-0529
PO BOX 530, SPARTANBURG, SC 29304-0530
PO BOX 531, SPARTANBURG, SC 29304-0531
PO BOX 532, SPARTANBURG, SC 29304-0532
PO BOX 533, SPARTANBURG, SC 29304-0533
PO BOX 534, SPARTANBURG, SC 29304-0534
PO BOX 535, SPARTANBURG, SC 29304-0535
PO BOX 536, SPARTANBURG, SC 29304-0536
PO BOX 537, SPARTANBURG, SC 29304-0537
PO BOX 538, SPARTANBURG, SC 29304-0538
PO BOX 539, SPARTANBURG, SC 29304-0539
PO BOX 540, SPARTANBURG, SC 29304-0540
PO BOX 541, SPARTANBURG, SC 29304-0541
PO BOX 542, SPARTANBURG, SC 29304-0542
PO BOX 543, SPARTANBURG, SC 29304-0543
PO BOX 544, SPARTANBURG, SC 29304-0544
PO BOX 545, SPARTANBURG, SC 29304-0545
PO BOX 546, SPARTANBURG, SC 29304-0546
PO BOX 547, SPARTANBURG, SC 29304-0547
PO BOX 548, SPARTANBURG, SC 29304-0548
PO BOX 549, SPARTANBURG, SC 29304-0549
PO BOX 550, SPARTANBURG, SC 29304-0550
PO BOX 551, SPARTANBURG, SC 29304-0551
PO BOX 552, SPARTANBURG, SC 29304-0552
PO BOX 553, SPARTANBURG, SC 29304-0553
PO BOX 554, SPARTANBURG, SC 29304-0554
PO BOX 555, SPARTANBURG, SC 29304-0555
PO BOX 556, SPARTANBURG, SC 29304-0556
PO BOX 557, SPARTANBURG, SC 29304-0557
PO BOX 558, SPARTANBURG, SC 29304-0558
PO BOX 559, SPARTANBURG, SC 29304-0559
PO BOX 560, SPARTANBURG, SC 29304-0560
PO BOX 561, SPARTANBURG, SC 29304-0561
PO BOX 562, SPARTANBURG, SC 29304-0562
PO BOX 563, SPARTANBURG, SC 29304-0563
PO BOX 564, SPARTANBURG, SC 29304-0564
PO BOX 565, SPARTANBURG, SC 29304-0565
PO BOX 566, SPARTANBURG, SC 29304-0566
PO BOX 567, SPARTANBURG, SC 29304-0567
PO BOX 568, SPARTANBURG, SC 29304-0568
PO BOX 569, SPARTANBURG, SC 29304-0569
PO BOX 570, SPARTANBURG, SC 29304-0570
PO BOX 571, SPARTANBURG, SC 29304-0571
PO BOX 572, SPARTANBURG, SC 29304-0572
PO BOX 573, SPARTANBURG, SC 29304-0573
PO BOX 574, SPARTANBURG, SC 29304-0574
PO BOX 575, SPARTANBURG, SC 29304-0575
PO BOX 576, SPARTANBURG, SC 29304-0576
PO BOX 577, SPARTANBURG, SC 29304-0577
PO BOX 578, SPARTANBURG, SC 29304-0578
PO BOX 579, SPARTANBURG, SC 29304-0579
PO BOX 580, SPARTANBURG, SC 29304-0580
PO BOX 581, SPARTANBURG, SC 29304-0581
PO BOX 582, SPARTANBURG, SC 29304-0582
PO BOX 583, SPARTANBURG, SC 29304-0583
PO BOX 584, SPARTANBURG, SC 29304-0584
PO BOX 585, SPARTANBURG, SC 29304-0585
PO BOX 586, SPARTANBURG, SC 29304-0586
PO BOX 587, SPARTANBURG, SC 29304-0587
PO BOX 588, SPARTANBURG, SC 29304-0588
PO BOX 589, SPARTANBURG, SC 29304-0589
PO BOX 590, SPARTANBURG, SC 29304-0590
PO BOX 591, SPARTANBURG, SC 29304-0591
PO BOX 592, SPARTANBURG, SC 29304-0592
PO BOX 593, SPARTANBURG, SC 29304-0593
PO BOX 594, SPARTANBURG, SC 29304-0594
PO BOX 595, SPARTANBURG, SC 29304-0595
PO BOX 596, SPARTANBURG, SC 29304-0596
PO BOX 597, SPARTANBURG, SC 29304-0597
PO BOX 598, SPARTANBURG, SC 29304-0598
PO BOX 599, SPARTANBURG, SC 29304-0599
PO BOX 600, SPARTANBURG, SC 29304-0600
PO BOX 601, SPARTANBURG, SC 29304-0601
PO BOX 602, SPARTANBURG, SC 29304-0602
PO BOX 603, SPARTANBURG, SC 29304-0603
PO BOX 604, SPARTANBURG, SC 29304-0604
PO BOX 605, SPARTANBURG, SC 29304-0605
PO BOX 606, SPARTANBURG, SC 29304-0606
PO BOX 607, SPARTANBURG, SC 29304-0607
PO BOX 608, SPARTANBURG, SC 29304-0608
PO BOX 609, SPARTANBURG, SC 29304-0609
PO BOX 610, SPARTANBURG, SC 29304-0610
PO BOX 611, SPARTANBURG, SC 29304-0611
PO BOX 612, SPARTANBURG, SC 29304-0612
PO BOX 613, SPARTANBURG, SC 29304-0613
PO BOX 614, SPARTANBURG, SC 29304-0614
PO BOX 615, SPARTANBURG, SC 29304-0615
PO BOX 616, SPARTANBURG, SC 29304-0616
PO BOX 617, SPARTANBURG, SC 29304-0617
PO BOX 618, SPARTANBURG, SC 29304-0618
PO BOX 619, SPARTANBURG, SC 29304-0619
PO BOX 620, SPARTANBURG, SC 29304-0620
PO BOX 621, SPARTANBURG, SC 29304-0621
PO BOX 622, SPARTANBURG, SC 29304-0622
PO BOX 623, SPARTANBURG, SC 29304-0623
PO BOX 624, SPARTANBURG, SC 29304-0624
PO BOX 625, SPARTANBURG, SC 29304-0625
PO BOX 626, SPARTANBURG, SC 29304-0626
PO BOX 627, SPARTANBURG, SC 29304-0627
PO BOX 628, SPARTANBURG, SC 29304-0628
PO BOX 629, SPARTANBURG, SC 29304-0629
PO BOX 630, SPARTANBURG, SC 29304-0630
PO BOX 631, SPARTANBURG, SC 29304-0631
PO BOX 632, SPARTANBURG, SC 29304-0632
PO BOX 633, SPARTANBURG, SC 29304-0633
PO BOX 634, SPARTANBURG, SC 29304-0634
PO BOX 635, SPARTANBURG, SC 29304-0635
PO BOX 636, SPARTANBURG, SC 29304-0636
PO BOX 637, SPARTANBURG, SC 29304-0637
PO BOX 638, SPARTANBURG, SC 29304-0638
PO BOX 639, SPARTANBURG, SC 29304-0639
PO BOX 640, SPARTANBURG, SC 29304-0640
PO BOX 641, SPARTANBURG, SC 29304-0641
PO BOX 642, SPARTANBURG, SC 29304-0642
PO BOX 643, SPARTANBURG, SC 29304-0643
PO BOX 644, SPARTANBURG, SC 29304-0644
PO BOX 645, SPARTANBURG, SC 29304-0645
PO BOX 646, SPARTANBURG, SC 29304-0646
PO BOX 647, SPARTANBURG, SC 29304-0647
PO BOX 648, SPARTANBURG, SC 29304-0648
PO BOX 649, SPARTANBURG, SC 29304-0649
PO BOX 650, SPARTANBURG, SC 29304-0650
PO BOX 651, SPARTANBURG, SC 29304-0651
PO BOX 652, SPARTANBURG, SC 29304-0652
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