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, CHARLOTTE, TX 78011-0421
PO BOX 422, CHARLOTTE, TX 78011-0422
PO BOX 423, CHARLOTTE, TX 78011-0423
PO BOX 424, CHARLOTTE, TX 78011-0424
PO BOX 425, CHARLOTTE, TX 78011-0425
PO BOX 426, CHARLOTTE, TX 78011-0426
PO BOX 427, CHARLOTTE, TX 78011-0427
PO BOX 428, CHARLOTTE, TX 78011-0428
PO BOX 429, CHARLOTTE, TX 78011-0429
PO BOX 430, CHARLOTTE, TX 78011-0430
PO BOX 431, CHARLOTTE, TX 78011-0431
PO BOX 432, CHARLOTTE, TX 78011-0432
PO BOX 433, CHARLOTTE, TX 78011-0433
PO BOX 434, CHARLOTTE, TX 78011-0434
PO BOX 435, CHARLOTTE, TX 78011-0435
PO BOX 436, CHARLOTTE, TX 78011-0436
PO BOX 437, CHARLOTTE, TX 78011-0437
PO BOX 438, CHARLOTTE, TX 78011-0438
PO BOX 439, CHARLOTTE, TX 78011-0439
PO BOX 440, CHARLOTTE, TX 78011-0440
PO BOX 441, CHARLOTTE, TX 78011-0441
PO BOX 442, CHARLOTTE, TX 78011-0442
PO BOX 443, CHARLOTTE, TX 78011-0443
PO BOX 444, CHARLOTTE, TX 78011-0444
PO BOX 445, CHARLOTTE, TX 78011-0445
PO BOX 446, CHARLOTTE, TX 78011-0446
PO BOX 447, CHARLOTTE, TX 78011-0447
PO BOX 448, CHARLOTTE, TX 78011-0448
PO BOX 449, CHARLOTTE, TX 78011-0449
PO BOX 450, CHARLOTTE, TX 78011-0450
PO BOX 451, CHARLOTTE, TX 78011-0451
PO BOX 452, CHARLOTTE, TX 78011-0452
PO BOX 453, CHARLOTTE, TX 78011-0453
PO BOX 454, CHARLOTTE, TX 78011-0454
PO BOX 455, CHARLOTTE, TX 78011-0455
PO BOX 456, CHARLOTTE, TX 78011-0456
PO BOX 457, CHARLOTTE, TX 78011-0457
PO BOX 458, CHARLOTTE, TX 78011-0458
PO BOX 459, CHARLOTTE, TX 78011-0459
PO BOX 460, CHARLOTTE, TX 78011-0460
PO BOX 461, CHARLOTTE, TX 78011-0461
PO BOX 462, CHARLOTTE, TX 78011-0462
PO BOX 463, CHARLOTTE, TX 78011-0463
PO BOX 464, CHARLOTTE, TX 78011-0464
PO BOX 465, CHARLOTTE, TX 78011-0465
PO BOX 466, CHARLOTTE, TX 78011-0466
PO BOX 467, CHARLOTTE, TX 78011-0467
PO BOX 468, CHARLOTTE, TX 78011-0468
PO BOX 469, CHARLOTTE, TX 78011-0469
PO BOX 470, CHARLOTTE, TX 78011-0470
PO BOX 471, CHARLOTTE, TX 78011-0471
PO BOX 472, CHARLOTTE, TX 78011-0472
PO BOX 473, CHARLOTTE, TX 78011-0473
PO BOX 474, CHARLOTTE, TX 78011-0474
PO BOX 475, CHARLOTTE, TX 78011-0475
PO BOX 476, CHARLOTTE, TX 78011-0476
PO BOX 477, CHARLOTTE, TX 78011-0477
PO BOX 478, CHARLOTTE, TX 78011-0478
PO BOX 479, CHARLOTTE, TX 78011-0479
PO BOX 480, CHARLOTTE, TX 78011-0480
PO BOX 481, CHARLOTTE, TX 78011-0481
PO BOX 482, CHARLOTTE, TX 78011-0482
PO BOX 483, CHARLOTTE, TX 78011-0483
PO BOX 484, CHARLOTTE, TX 78011-0484
PO BOX 485, CHARLOTTE, TX 78011-0485
PO BOX 486, CHARLOTTE, TX 78011-0486
PO BOX 487, CHARLOTTE, TX 78011-0487
PO BOX 488, CHARLOTTE, TX 78011-0488
PO BOX 489, CHARLOTTE, TX 78011-0489
PO BOX 490, CHARLOTTE, TX 78011-0490
PO BOX 491, CHARLOTTE, TX 78011-0491
PO BOX 492, CHARLOTTE, TX 78011-0492
PO BOX 493, CHARLOTTE, TX 78011-0493
PO BOX 494, CHARLOTTE, TX 78011-0494
PO BOX 495, CHARLOTTE, TX 78011-0495
PO BOX 496, CHARLOTTE, TX 78011-0496
PO BOX 497, CHARLOTTE, TX 78011-0497
PO BOX 498, CHARLOTTE, TX 78011-0498
PO BOX 499, CHARLOTTE, TX 78011-0499
PO BOX 500, CHARLOTTE, TX 78011-0500
PO BOX 501, CHARLOTTE, TX 78011-0501
PO BOX 502, CHARLOTTE, TX 78011-0502
PO BOX 503, CHARLOTTE, TX 78011-0503
PO BOX 504, CHARLOTTE, TX 78011-0504
PO BOX 505, CHARLOTTE, TX 78011-0505
PO BOX 506, CHARLOTTE, TX 78011-0506
PO BOX 507, CHARLOTTE, TX 78011-0507
PO BOX 508, CHARLOTTE, TX 78011-0508
PO BOX 509, CHARLOTTE, TX 78011-0509
PO BOX 510, CHARLOTTE, TX 78011-0510
PO BOX 511, CHARLOTTE, TX 78011-0511
PO BOX 512, CHARLOTTE, TX 78011-0512
PO BOX 513, CHARLOTTE, TX 78011-0513
PO BOX 514, CHARLOTTE, TX 78011-0514
PO BOX 515, CHARLOTTE, TX 78011-0515
PO BOX 516, CHARLOTTE, TX 78011-0516
PO BOX 517, CHARLOTTE, TX 78011-0517
PO BOX 518, CHARLOTTE, TX 78011-0518
PO BOX 519, CHARLOTTE, TX 78011-0519
PO BOX 520, CHARLOTTE, TX 78011-0520
PO BOX 521, CHARLOTTE, TX 78011-0521
PO BOX 522, CHARLOTTE, TX 78011-0522
PO BOX 523, CHARLOTTE, TX 78011-0523
PO BOX 524, CHARLOTTE, TX 78011-0524
PO BOX 525, CHARLOTTE, TX 78011-0525
PO BOX 526, CHARLOTTE, TX 78011-0526
PO BOX 527, CHARLOTTE, TX 78011-0527
PO BOX 528, CHARLOTTE, TX 78011-0528
PO BOX 529, CHARLOTTE, TX 78011-0529
PO BOX 530, CHARLOTTE, TX 78011-0530
PO BOX 531, CHARLOTTE, TX 78011-0531
PO BOX 532, CHARLOTTE, TX 78011-0532
PO BOX 533, CHARLOTTE, TX 78011-0533
PO BOX 534, CHARLOTTE, TX 78011-0534
PO BOX 535, CHARLOTTE, TX 78011-0535
PO BOX 536, CHARLOTTE, TX 78011-0536
PO BOX 537, CHARLOTTE, TX 78011-0537
PO BOX 538, CHARLOTTE, TX 78011-0538
PO BOX 539, CHARLOTTE, TX 78011-0539
PO BOX 540, CHARLOTTE, TX 78011-0540
PO BOX 541, CHARLOTTE, TX 78011-0541
PO BOX 542, CHARLOTTE, TX 78011-0542
PO BOX 543, CHARLOTTE, TX 78011-0543
PO BOX 544, CHARLOTTE, TX 78011-0544
PO BOX 545, CHARLOTTE, TX 78011-0545
PO BOX 546, CHARLOTTE, TX 78011-0546
PO BOX 547, CHARLOTTE, TX 78011-0547
PO BOX 548, CHARLOTTE, TX 78011-0548
PO BOX 549, CHARLOTTE, TX 78011-0549
PO BOX 550, CHARLOTTE, TX 78011-0550
PO BOX 551, CHARLOTTE, TX 78011-0551
PO BOX 552, CHARLOTTE, TX 78011-0552
PO BOX 553, CHARLOTTE, TX 78011-0553
PO BOX 554, CHARLOTTE, TX 78011-0554
PO BOX 555, CHARLOTTE, TX 78011-0555
PO BOX 556, CHARLOTTE, TX 78011-0556
PO BOX 557, CHARLOTTE, TX 78011-0557
PO BOX 558, CHARLOTTE, TX 78011-0558
PO BOX 559, CHARLOTTE, TX 78011-0559
PO BOX 560, CHARLOTTE, TX 78011-0560
PO BOX 561, CHARLOTTE, TX 78011-0561
PO BOX 562, CHARLOTTE, TX 78011-0562
PO BOX 563, CHARLOTTE, TX 78011-0563
PO BOX 564, CHARLOTTE, TX 78011-0564
PO BOX 565, CHARLOTTE, TX 78011-0565
PO BOX 566, CHARLOTTE, TX 78011-0566
PO BOX 567, CHARLOTTE, TX 78011-0567
PO BOX 568, CHARLOTTE, TX 78011-0568
PO BOX 569, CHARLOTTE, TX 78011-0569
PO BOX 570, CHARLOTTE, TX 78011-0570
PO BOX 571, CHARLOTTE, TX 78011-0571
PO BOX 572, CHARLOTTE, TX 78011-0572
PO BOX 573, CHARLOTTE, TX 78011-0573
PO BOX 574, CHARLOTTE, TX 78011-0574
PO BOX 575, CHARLOTTE, TX 78011-0575
PO BOX 576, CHARLOTTE, TX 78011-0576
PO BOX 577, CHARLOTTE, TX 78011-0577
PO BOX 578, CHARLOTTE, TX 78011-0578
PO BOX 579, CHARLOTTE, TX 78011-0579
PO BOX 580, CHARLOTTE, TX 78011-0580
PO BOX 581, CHARLOTTE, TX 78011-0581
PO BOX 582, CHARLOTTE, TX 78011-0582
PO BOX 583, CHARLOTTE, TX 78011-0583
PO BOX 584, CHARLOTTE, TX 78011-0584
PO BOX 585, CHARLOTTE, TX 78011-0585
PO BOX 586, CHARLOTTE, TX 78011-0586
PO BOX 587, CHARLOTTE, TX 78011-0587
PO BOX 588, CHARLOTTE, TX 78011-0588
PO BOX 589, CHARLOTTE, TX 78011-0589
PO BOX 590, CHARLOTTE, TX 78011-0590
PO BOX 591, CHARLOTTE, TX 78011-0591
PO BOX 592, CHARLOTTE, TX 78011-0592
PO BOX 593, CHARLOTTE, TX 78011-0593
PO BOX 594, CHARLOTTE, TX 78011-0594
PO BOX 595, CHARLOTTE, TX 78011-0595
PO BOX 596, CHARLOTTE, TX 78011-0596
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