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 421, MOUNT PLEASANT, SC 29465-0421
PO BOX 422, MOUNT PLEASANT, SC 29465-0422
PO BOX 423, MOUNT PLEASANT, SC 29465-0423
PO BOX 424, MOUNT PLEASANT, SC 29465-0424
PO BOX 425, MOUNT PLEASANT, SC 29465-0425
PO BOX 426, MOUNT PLEASANT, SC 29465-0426
PO BOX 427, MOUNT PLEASANT, SC 29465-0427
PO BOX 428, MOUNT PLEASANT, SC 29465-0428
PO BOX 429, MOUNT PLEASANT, SC 29465-0429
PO BOX 430, MOUNT PLEASANT, SC 29465-0430
PO BOX 431, MOUNT PLEASANT, SC 29465-0431
PO BOX 432, MOUNT PLEASANT, SC 29465-0432
PO BOX 433, MOUNT PLEASANT, SC 29465-0433
PO BOX 434, MOUNT PLEASANT, SC 29465-0434
PO BOX 435, MOUNT PLEASANT, SC 29465-0435
PO BOX 436, MOUNT PLEASANT, SC 29465-0436
PO BOX 437, MOUNT PLEASANT, SC 29465-0437
PO BOX 438, MOUNT PLEASANT, SC 29465-0438
PO BOX 439, MOUNT PLEASANT, SC 29465-0439
PO BOX 440, MOUNT PLEASANT, SC 29465-0440
PO BOX 441, MOUNT PLEASANT, SC 29465-0441
PO BOX 442, MOUNT PLEASANT, SC 29465-0442
PO BOX 443, MOUNT PLEASANT, SC 29465-0443
PO BOX 444, MOUNT PLEASANT, SC 29465-0444
PO BOX 445, MOUNT PLEASANT, SC 29465-0445
PO BOX 446, MOUNT PLEASANT, SC 29465-0446
PO BOX 447, MOUNT PLEASANT, SC 29465-0447
PO BOX 448, MOUNT PLEASANT, SC 29465-0448
PO BOX 449, MOUNT PLEASANT, SC 29465-0449
PO BOX 450, MOUNT PLEASANT, SC 29465-0450
PO BOX 451, MOUNT PLEASANT, SC 29465-0451
PO BOX 452, MOUNT PLEASANT, SC 29465-0452
PO BOX 453, MOUNT PLEASANT, SC 29465-0453
PO BOX 454, MOUNT PLEASANT, SC 29465-0454
PO BOX 455, MOUNT PLEASANT, SC 29465-0455
PO BOX 456, MOUNT PLEASANT, SC 29465-0456
PO BOX 457, MOUNT PLEASANT, SC 29465-0457
PO BOX 458, MOUNT PLEASANT, SC 29465-0458
PO BOX 459, MOUNT PLEASANT, SC 29465-0459
PO BOX 460, MOUNT PLEASANT, SC 29465-0460
PO BOX 461, MOUNT PLEASANT, SC 29465-0461
PO BOX 462, MOUNT PLEASANT, SC 29465-0462
PO BOX 463, MOUNT PLEASANT, SC 29465-0463
PO BOX 464, MOUNT PLEASANT, SC 29465-0464
PO BOX 465, MOUNT PLEASANT, SC 29465-0465
PO BOX 466, MOUNT PLEASANT, SC 29465-0466
PO BOX 467, MOUNT PLEASANT, SC 29465-0467
PO BOX 468, MOUNT PLEASANT, SC 29465-0468
PO BOX 469, MOUNT PLEASANT, SC 29465-0469
PO BOX 470, MOUNT PLEASANT, SC 29465-0470
PO BOX 471, MOUNT PLEASANT, SC 29465-0471
PO BOX 472, MOUNT PLEASANT, SC 29465-0472
PO BOX 473, MOUNT PLEASANT, SC 29465-0473
PO BOX 474, MOUNT PLEASANT, SC 29465-0474
PO BOX 475, MOUNT PLEASANT, SC 29465-0475
PO BOX 476, MOUNT PLEASANT, SC 29465-0476
PO BOX 477, MOUNT PLEASANT, SC 29465-0477
PO BOX 478, MOUNT PLEASANT, SC 29465-0478
PO BOX 479, MOUNT PLEASANT, SC 29465-0479
PO BOX 480, MOUNT PLEASANT, SC 29465-0480
PO BOX 481, MOUNT PLEASANT, SC 29465-0481
PO BOX 482, MOUNT PLEASANT, SC 29465-0482
PO BOX 483, MOUNT PLEASANT, SC 29465-0483
PO BOX 484, MOUNT PLEASANT, SC 29465-0484
PO BOX 485, MOUNT PLEASANT, SC 29465-0485
PO BOX 486, MOUNT PLEASANT, SC 29465-0486
PO BOX 487, MOUNT PLEASANT, SC 29465-0487
PO BOX 488, MOUNT PLEASANT, SC 29465-0488
PO BOX 489, MOUNT PLEASANT, SC 29465-0489
PO BOX 490, MOUNT PLEASANT, SC 29465-0490
PO BOX 491, MOUNT PLEASANT, SC 29465-0491
PO BOX 492, MOUNT PLEASANT, SC 29465-0492
PO BOX 493, MOUNT PLEASANT, SC 29465-0493
PO BOX 494, MOUNT PLEASANT, SC 29465-0494
PO BOX 495, MOUNT PLEASANT, SC 29465-0495
PO BOX 496, MOUNT PLEASANT, SC 29465-0496
PO BOX 497, MOUNT PLEASANT, SC 29465-0497
PO BOX 498, MOUNT PLEASANT, SC 29465-0498
PO BOX 499, MOUNT PLEASANT, SC 29465-0499
PO BOX 500, MOUNT PLEASANT, SC 29465-0500
PO BOX 501, MOUNT PLEASANT, SC 29465-0501
PO BOX 502, MOUNT PLEASANT, SC 29465-0502
PO BOX 503, MOUNT PLEASANT, SC 29465-0503
PO BOX 504, MOUNT PLEASANT, SC 29465-0504
PO BOX 505, MOUNT PLEASANT, SC 29465-0505
PO BOX 506, MOUNT PLEASANT, SC 29465-0506
PO BOX 507, MOUNT PLEASANT, SC 29465-0507
PO BOX 508, MOUNT PLEASANT, SC 29465-0508
PO BOX 509, MOUNT PLEASANT, SC 29465-0509
PO BOX 510, MOUNT PLEASANT, SC 29465-0510
PO BOX 511, MOUNT PLEASANT, SC 29465-0511
PO BOX 512, MOUNT PLEASANT, SC 29465-0512
PO BOX 513, MOUNT PLEASANT, SC 29465-0513
PO BOX 514, MOUNT PLEASANT, SC 29465-0514
PO BOX 515, MOUNT PLEASANT, SC 29465-0515
PO BOX 516, MOUNT PLEASANT, SC 29465-0516
PO BOX 517, MOUNT PLEASANT, SC 29465-0517
PO BOX 518, MOUNT PLEASANT, SC 29465-0518
PO BOX 519, MOUNT PLEASANT, SC 29465-0519
PO BOX 520, MOUNT PLEASANT, SC 29465-0520
PO BOX 521, MOUNT PLEASANT, SC 29465-0521
PO BOX 522, MOUNT PLEASANT, SC 29465-0522
PO BOX 523, MOUNT PLEASANT, SC 29465-0523
PO BOX 524, MOUNT PLEASANT, SC 29465-0524
PO BOX 525, MOUNT PLEASANT, SC 29465-0525
PO BOX 526, MOUNT PLEASANT, SC 29465-0526
PO BOX 527, MOUNT PLEASANT, SC 29465-0527
PO BOX 528, MOUNT PLEASANT, SC 29465-0528
PO BOX 529, MOUNT PLEASANT, SC 29465-0529
PO BOX 530, MOUNT PLEASANT, SC 29465-0530
PO BOX 531, MOUNT PLEASANT, SC 29465-0531
PO BOX 532, MOUNT PLEASANT, SC 29465-0532
PO BOX 533, MOUNT PLEASANT, SC 29465-0533
PO BOX 534, MOUNT PLEASANT, SC 29465-0534
PO BOX 535, MOUNT PLEASANT, SC 29465-0535
PO BOX 536, MOUNT PLEASANT, SC 29465-0536
PO BOX 537, MOUNT PLEASANT, SC 29465-0537
PO BOX 538, MOUNT PLEASANT, SC 29465-0538
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