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 541, MOUNT PLEASANT, SC 29465-0541
PO BOX 542, MOUNT PLEASANT, SC 29465-0542
PO BOX 543, MOUNT PLEASANT, SC 29465-0543
PO BOX 544, MOUNT PLEASANT, SC 29465-0544
PO BOX 545, MOUNT PLEASANT, SC 29465-0545
PO BOX 546, MOUNT PLEASANT, SC 29465-0546
PO BOX 547, MOUNT PLEASANT, SC 29465-0547
PO BOX 548, MOUNT PLEASANT, SC 29465-0548
PO BOX 549, MOUNT PLEASANT, SC 29465-0549
PO BOX 550, MOUNT PLEASANT, SC 29465-0550
PO BOX 551, MOUNT PLEASANT, SC 29465-0551
PO BOX 552, MOUNT PLEASANT, SC 29465-0552
PO BOX 553, MOUNT PLEASANT, SC 29465-0553
PO BOX 554, MOUNT PLEASANT, SC 29465-0554
PO BOX 555, MOUNT PLEASANT, SC 29465-0555
PO BOX 556, MOUNT PLEASANT, SC 29465-0556
PO BOX 557, MOUNT PLEASANT, SC 29465-0557
PO BOX 558, MOUNT PLEASANT, SC 29465-0558
PO BOX 559, MOUNT PLEASANT, SC 29465-0559
PO BOX 560, MOUNT PLEASANT, SC 29465-0560
PO BOX 561, MOUNT PLEASANT, SC 29465-0561
PO BOX 562, MOUNT PLEASANT, SC 29465-0562
PO BOX 563, MOUNT PLEASANT, SC 29465-0563
PO BOX 564, MOUNT PLEASANT, SC 29465-0564
PO BOX 565, MOUNT PLEASANT, SC 29465-0565
PO BOX 566, MOUNT PLEASANT, SC 29465-0566
PO BOX 567, MOUNT PLEASANT, SC 29465-0567
PO BOX 568, MOUNT PLEASANT, SC 29465-0568
PO BOX 569, MOUNT PLEASANT, SC 29465-0569
PO BOX 570, MOUNT PLEASANT, SC 29465-0570
PO BOX 571, MOUNT PLEASANT, SC 29465-0571
PO BOX 572, MOUNT PLEASANT, SC 29465-0572
PO BOX 573, MOUNT PLEASANT, SC 29465-0573
PO BOX 574, MOUNT PLEASANT, SC 29465-0574
PO BOX 575, MOUNT PLEASANT, SC 29465-0575
PO BOX 576, MOUNT PLEASANT, SC 29465-0576
PO BOX 577, MOUNT PLEASANT, SC 29465-0577
PO BOX 578, MOUNT PLEASANT, SC 29465-0578
PO BOX 579, MOUNT PLEASANT, SC 29465-0579
PO BOX 580, MOUNT PLEASANT, SC 29465-0580
PO BOX 581, MOUNT PLEASANT, SC 29465-0581
PO BOX 582, MOUNT PLEASANT, SC 29465-0582
PO BOX 583, MOUNT PLEASANT, SC 29465-0583
PO BOX 584, MOUNT PLEASANT, SC 29465-0584
PO BOX 585, MOUNT PLEASANT, SC 29465-0585
PO BOX 586, MOUNT PLEASANT, SC 29465-0586
PO BOX 587, MOUNT PLEASANT, SC 29465-0587
PO BOX 588, MOUNT PLEASANT, SC 29465-0588
PO BOX 589, MOUNT PLEASANT, SC 29465-0589
PO BOX 590, MOUNT PLEASANT, SC 29465-0590
PO BOX 591, MOUNT PLEASANT, SC 29465-0591
PO BOX 592, MOUNT PLEASANT, SC 29465-0592
PO BOX 593, MOUNT PLEASANT, SC 29465-0593
PO BOX 594, MOUNT PLEASANT, SC 29465-0594
PO BOX 595, MOUNT PLEASANT, SC 29465-0595
PO BOX 596, MOUNT PLEASANT, SC 29465-0596
PO BOX 597, MOUNT PLEASANT, SC 29465-0597
PO BOX 598, MOUNT PLEASANT, SC 29465-0598
PO BOX 599, MOUNT PLEASANT, SC 29465-0599
PO BOX 600, MOUNT PLEASANT, SC 29465-0600
PO BOX 601, MOUNT PLEASANT, SC 29465-0601
PO BOX 602, MOUNT PLEASANT, SC 29465-0602
PO BOX 603, MOUNT PLEASANT, SC 29465-0603
PO BOX 604, MOUNT PLEASANT, SC 29465-0604
PO BOX 605, MOUNT PLEASANT, SC 29465-0605
PO BOX 606, MOUNT PLEASANT, SC 29465-0606
PO BOX 607, MOUNT PLEASANT, SC 29465-0607
PO BOX 608, MOUNT PLEASANT, SC 29465-0608
PO BOX 609, MOUNT PLEASANT, SC 29465-0609
PO BOX 610, MOUNT PLEASANT, SC 29465-0610
PO BOX 611, MOUNT PLEASANT, SC 29465-0611
PO BOX 612, MOUNT PLEASANT, SC 29465-0612
PO BOX 613, MOUNT PLEASANT, SC 29465-0613
PO BOX 614, MOUNT PLEASANT, SC 29465-0614
PO BOX 615, MOUNT PLEASANT, SC 29465-0615
PO BOX 616, MOUNT PLEASANT, SC 29465-0616
PO BOX 617, MOUNT PLEASANT, SC 29465-0617
PO BOX 618, MOUNT PLEASANT, SC 29465-0618
PO BOX 619, MOUNT PLEASANT, SC 29465-0619
PO BOX 620, MOUNT PLEASANT, SC 29465-0620
PO BOX 621, MOUNT PLEASANT, SC 29465-0621
PO BOX 622, MOUNT PLEASANT, SC 29465-0622
PO BOX 623, MOUNT PLEASANT, SC 29465-0623
PO BOX 624, MOUNT PLEASANT, SC 29465-0624
PO BOX 625, MOUNT PLEASANT, SC 29465-0625
PO BOX 626, MOUNT PLEASANT, SC 29465-0626
PO BOX 627, MOUNT PLEASANT, SC 29465-0627
PO BOX 628, MOUNT PLEASANT, SC 29465-0628
PO BOX 629, MOUNT PLEASANT, SC 29465-0629
PO BOX 630, MOUNT PLEASANT, SC 29465-0630
PO BOX 631, MOUNT PLEASANT, SC 29465-0631
PO BOX 632, MOUNT PLEASANT, SC 29465-0632
PO BOX 633, MOUNT PLEASANT, SC 29465-0633
PO BOX 634, MOUNT PLEASANT, SC 29465-0634
PO BOX 635, MOUNT PLEASANT, SC 29465-0635
PO BOX 636, MOUNT PLEASANT, SC 29465-0636
PO BOX 637, MOUNT PLEASANT, SC 29465-0637
PO BOX 638, MOUNT PLEASANT, SC 29465-0638
PO BOX 639, MOUNT PLEASANT, SC 29465-0639
PO BOX 640, MOUNT PLEASANT, SC 29465-0640
PO BOX 641, MOUNT PLEASANT, SC 29465-0641
PO BOX 642, MOUNT PLEASANT, SC 29465-0642
PO BOX 643, MOUNT PLEASANT, SC 29465-0643
PO BOX 644, MOUNT PLEASANT, SC 29465-0644
PO BOX 645, MOUNT PLEASANT, SC 29465-0645
PO BOX 646, MOUNT PLEASANT, SC 29465-0646
PO BOX 647, MOUNT PLEASANT, SC 29465-0647
PO BOX 648, MOUNT PLEASANT, SC 29465-0648
PO BOX 649, MOUNT PLEASANT, SC 29465-0649
PO BOX 650, MOUNT PLEASANT, SC 29465-0650
PO BOX 651, MOUNT PLEASANT, SC 29465-0651
PO BOX 652, MOUNT PLEASANT, SC 29465-0652
PO BOX 653, MOUNT PLEASANT, SC 29465-0653
PO BOX 654, MOUNT PLEASANT, SC 29465-0654
PO BOX 655, MOUNT PLEASANT, SC 29465-0655
PO BOX 656, MOUNT PLEASANT, SC 29465-0656
PO BOX 657, MOUNT PLEASANT, SC 29465-0657
PO BOX 658, MOUNT PLEASANT, SC 29465-0658
PO BOX 659, MOUNT PLEASANT, SC 29465-0659
PO BOX 660, MOUNT PLEASANT, SC 29465-0660
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