A PO BOX szám lehet kevesebb, mint négyjegyű. A postafiókok esetében az általános szabály az, hogy minden doboznak megvan a maga ZIP + 4 kódja.
Az utolsó négy számjegy gyakran a következők egyike:
1. Nulla plusz a doboz számának utolsó három számjegye (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. A doboz utolsó négy számjegye (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. Ha a doboz száma kevesebb, mint négy számjegy, akkor a nulla elejéhez elegendő nullát kell készíteni egy négyjegyű szám előállításához(eg. PO BOX 1, Shreveport LA 71161-0001).
Nincs azonban egységes szabály, az irányítószám plusz négy csak referenciaként szolgál, a ZIP + 4 kódot egyedileg kell megkeresni az egyes mezőkhöz az USPS hivatalos webhelyén.
PO BOX 387, BISHOPVILLE, SC 29010-0387
PO BOX 388, BISHOPVILLE, SC 29010-0388
PO BOX 389, BISHOPVILLE, SC 29010-0389
PO BOX 390, BISHOPVILLE, SC 29010-0390
PO BOX 391, BISHOPVILLE, SC 29010-0391
PO BOX 392, BISHOPVILLE, SC 29010-0392
PO BOX 393, BISHOPVILLE, SC 29010-0393
PO BOX 394, BISHOPVILLE, SC 29010-0394
PO BOX 395, BISHOPVILLE, SC 29010-0395
PO BOX 396, BISHOPVILLE, SC 29010-0396
PO BOX 397, BISHOPVILLE, SC 29010-0397
PO BOX 398, BISHOPVILLE, SC 29010-0398
PO BOX 399, BISHOPVILLE, SC 29010-0399
PO BOX 400, BISHOPVILLE, SC 29010-0400
PO BOX 401, BISHOPVILLE, SC 29010-0401
PO BOX 402, BISHOPVILLE, SC 29010-0402
PO BOX 403, BISHOPVILLE, SC 29010-0403
PO BOX 404, BISHOPVILLE, SC 29010-0404
PO BOX 405, BISHOPVILLE, SC 29010-0405
PO BOX 406, BISHOPVILLE, SC 29010-0406
PO BOX 407, BISHOPVILLE, SC 29010-0407
PO BOX 408, BISHOPVILLE, SC 29010-0408
PO BOX 409, BISHOPVILLE, SC 29010-0409
PO BOX 410, BISHOPVILLE, SC 29010-0410
PO BOX 411, BISHOPVILLE, SC 29010-0411
PO BOX 412, BISHOPVILLE, SC 29010-0412
PO BOX 413, BISHOPVILLE, SC 29010-0413
PO BOX 414, BISHOPVILLE, SC 29010-0414
PO BOX 415, BISHOPVILLE, SC 29010-0415
PO BOX 416, BISHOPVILLE, SC 29010-0416
PO BOX 417, BISHOPVILLE, SC 29010-0417
PO BOX 418, BISHOPVILLE, SC 29010-0418
PO BOX 419, BISHOPVILLE, SC 29010-0419
PO BOX 420, BISHOPVILLE, SC 29010-0420
PO BOX 421, BISHOPVILLE, SC 29010-0421
PO BOX 422, BISHOPVILLE, SC 29010-0422
PO BOX 423, BISHOPVILLE, SC 29010-0423
PO BOX 424, BISHOPVILLE, SC 29010-0424
PO BOX 425, BISHOPVILLE, SC 29010-0425
PO BOX 426, BISHOPVILLE, SC 29010-0426
PO BOX 427, BISHOPVILLE, SC 29010-0427
PO BOX 428, BISHOPVILLE, SC 29010-0428
PO BOX 429, BISHOPVILLE, SC 29010-0429
PO BOX 430, BISHOPVILLE, SC 29010-0430
PO BOX 431, BISHOPVILLE, SC 29010-0431
PO BOX 432, BISHOPVILLE, SC 29010-0432
PO BOX 433, BISHOPVILLE, SC 29010-0433
PO BOX 434, BISHOPVILLE, SC 29010-0434
PO BOX 435, BISHOPVILLE, SC 29010-0435
PO BOX 436, BISHOPVILLE, SC 29010-0436
PO BOX 437, BISHOPVILLE, SC 29010-0437
PO BOX 438, BISHOPVILLE, SC 29010-0438
PO BOX 439, BISHOPVILLE, SC 29010-0439
PO BOX 440, BISHOPVILLE, SC 29010-0440
PO BOX 441, BISHOPVILLE, SC 29010-0441
PO BOX 442, BISHOPVILLE, SC 29010-0442
PO BOX 443, BISHOPVILLE, SC 29010-0443
PO BOX 444, BISHOPVILLE, SC 29010-0444
PO BOX 445, BISHOPVILLE, SC 29010-0445
PO BOX 446, BISHOPVILLE, SC 29010-0446
PO BOX 447, BISHOPVILLE, SC 29010-0447
PO BOX 448, BISHOPVILLE, SC 29010-0448
PO BOX 449, BISHOPVILLE, SC 29010-0449
PO BOX 450, BISHOPVILLE, SC 29010-0450
PO BOX 451, BISHOPVILLE, SC 29010-0451
PO BOX 452, BISHOPVILLE, SC 29010-0452
PO BOX 453, BISHOPVILLE, SC 29010-0453
PO BOX 454, BISHOPVILLE, SC 29010-0454
PO BOX 455, BISHOPVILLE, SC 29010-0455
PO BOX 456, BISHOPVILLE, SC 29010-0456
PO BOX 457, BISHOPVILLE, SC 29010-0457
PO BOX 458, BISHOPVILLE, SC 29010-0458
PO BOX 459, BISHOPVILLE, SC 29010-0459
PO BOX 460, BISHOPVILLE, SC 29010-0460
PO BOX 461, BISHOPVILLE, SC 29010-0461
PO BOX 462, BISHOPVILLE, SC 29010-0462
PO BOX 463, BISHOPVILLE, SC 29010-0463
PO BOX 464, BISHOPVILLE, SC 29010-0464
PO BOX 465, BISHOPVILLE, SC 29010-0465
PO BOX 466, BISHOPVILLE, SC 29010-0466
PO BOX 467, BISHOPVILLE, SC 29010-0467
PO BOX 468, BISHOPVILLE, SC 29010-0468
PO BOX 469, BISHOPVILLE, SC 29010-0469
PO BOX 470, BISHOPVILLE, SC 29010-0470
PO BOX 471, BISHOPVILLE, SC 29010-0471
PO BOX 472, BISHOPVILLE, SC 29010-0472
PO BOX 473, BISHOPVILLE, SC 29010-0473
PO BOX 474, BISHOPVILLE, SC 29010-0474
PO BOX 475, BISHOPVILLE, SC 29010-0475
PO BOX 476, BISHOPVILLE, SC 29010-0476
PO BOX 477, BISHOPVILLE, SC 29010-0477
PO BOX 478, BISHOPVILLE, SC 29010-0478
PO BOX 479, BISHOPVILLE, SC 29010-0479
PO BOX 480, BISHOPVILLE, SC 29010-0480
PO BOX 481, BISHOPVILLE, SC 29010-0481
PO BOX 482, BISHOPVILLE, SC 29010-0482
PO BOX 483, BISHOPVILLE, SC 29010-0483
PO BOX 484, BISHOPVILLE, SC 29010-0484
PO BOX 485, BISHOPVILLE, SC 29010-0485
PO BOX 486, BISHOPVILLE, SC 29010-0486
PO BOX 487, BISHOPVILLE, SC 29010-0487
PO BOX 488, BISHOPVILLE, SC 29010-0488
PO BOX 489, BISHOPVILLE, SC 29010-0489
PO BOX 490, BISHOPVILLE, SC 29010-0490
PO BOX 491, BISHOPVILLE, SC 29010-0491
PO BOX 492, BISHOPVILLE, SC 29010-0492
PO BOX 493, BISHOPVILLE, SC 29010-0493
PO BOX 494, BISHOPVILLE, SC 29010-0494
PO BOX 495, BISHOPVILLE, SC 29010-0495
PO BOX 496, BISHOPVILLE, SC 29010-0496
PO BOX 497, BISHOPVILLE, SC 29010-0497
PO BOX 498, BISHOPVILLE, SC 29010-0498
PO BOX 499, BISHOPVILLE, SC 29010-0499
PO BOX 500, BISHOPVILLE, SC 29010-0500
PO BOX 501, BISHOPVILLE, SC 29010-0501
PO BOX 502, BISHOPVILLE, SC 29010-0502
PO BOX 503, BISHOPVILLE, SC 29010-0503
PO BOX 504, BISHOPVILLE, SC 29010-0504
PO BOX 505, BISHOPVILLE, SC 29010-0505
PO BOX 506, BISHOPVILLE, SC 29010-0506
PO BOX 507, BISHOPVILLE, SC 29010-0507
PO BOX 508, BISHOPVILLE, SC 29010-0508
PO BOX 509, BISHOPVILLE, SC 29010-0509
PO BOX 510, BISHOPVILLE, SC 29010-0510
PO BOX 511, BISHOPVILLE, SC 29010-0511
PO BOX 512, BISHOPVILLE, SC 29010-0512
PO BOX 513, BISHOPVILLE, SC 29010-0513
PO BOX 514, BISHOPVILLE, SC 29010-0514
PO BOX 515, BISHOPVILLE, SC 29010-0515
PO BOX 516, BISHOPVILLE, SC 29010-0516
PO BOX 517, BISHOPVILLE, SC 29010-0517
PO BOX 518, BISHOPVILLE, SC 29010-0518
PO BOX 519, BISHOPVILLE, SC 29010-0519
PO BOX 520, BISHOPVILLE, SC 29010-0520
PO BOX 521, BISHOPVILLE, SC 29010-0521
PO BOX 522, BISHOPVILLE, SC 29010-0522
PO BOX 523, BISHOPVILLE, SC 29010-0523
PO BOX 524, BISHOPVILLE, SC 29010-0524
PO BOX 525, BISHOPVILLE, SC 29010-0525
PO BOX 526, BISHOPVILLE, SC 29010-0526
PO BOX 527, BISHOPVILLE, SC 29010-0527
PO BOX 528, BISHOPVILLE, SC 29010-0528
PO BOX 529, BISHOPVILLE, SC 29010-0529
PO BOX 530, BISHOPVILLE, SC 29010-0530
PO BOX 531, BISHOPVILLE, SC 29010-0531
PO BOX 532, BISHOPVILLE, SC 29010-0532
PO BOX 533, BISHOPVILLE, SC 29010-0533
PO BOX 534, BISHOPVILLE, SC 29010-0534
PO BOX 535, BISHOPVILLE, SC 29010-0535
PO BOX 536, BISHOPVILLE, SC 29010-0536
PO BOX 537, BISHOPVILLE, SC 29010-0537
PO BOX 538, BISHOPVILLE, SC 29010-0538
PO BOX 539, BISHOPVILLE, SC 29010-0539
PO BOX 540, BISHOPVILLE, SC 29010-0540
PO BOX 541, BISHOPVILLE, SC 29010-0541
PO BOX 542, BISHOPVILLE, SC 29010-0542
PO BOX 543, BISHOPVILLE, SC 29010-0543
PO BOX 544, BISHOPVILLE, SC 29010-0544
PO BOX 545, BISHOPVILLE, SC 29010-0545
PO BOX 546, BISHOPVILLE, SC 29010-0546
PO BOX 547, BISHOPVILLE, SC 29010-0547
PO BOX 548, BISHOPVILLE, SC 29010-0548
PO BOX 549, BISHOPVILLE, SC 29010-0549
PO BOX 550, BISHOPVILLE, SC 29010-0550
PO BOX 551, BISHOPVILLE, SC 29010-0551
PO BOX 552, BISHOPVILLE, SC 29010-0552
PO BOX 553, BISHOPVILLE, SC 29010-0553
PO BOX 554, BISHOPVILLE, SC 29010-0554
PO BOX 555, BISHOPVILLE, SC 29010-0555
PO BOX 556, BISHOPVILLE, SC 29010-0556
PO BOX 557, BISHOPVILLE, SC 29010-0557
PO BOX 558, BISHOPVILLE, SC 29010-0558
PO BOX 559, BISHOPVILLE, SC 29010-0559
PO BOX 560, BISHOPVILLE, SC 29010-0560
PO BOX 561, BISHOPVILLE, SC 29010-0561
PO BOX 562, BISHOPVILLE, SC 29010-0562
PO BOX 563, BISHOPVILLE, SC 29010-0563
PO BOX 564, BISHOPVILLE, SC 29010-0564
PO BOX 565, BISHOPVILLE, SC 29010-0565
PO BOX 566, BISHOPVILLE, SC 29010-0566
PO BOX 567, BISHOPVILLE, SC 29010-0567
PO BOX 568, BISHOPVILLE, SC 29010-0568
PO BOX 569, BISHOPVILLE, SC 29010-0569
PO BOX 570, BISHOPVILLE, SC 29010-0570
PO BOX 571, BISHOPVILLE, SC 29010-0571
PO BOX 572, BISHOPVILLE, SC 29010-0572
PO BOX 573, BISHOPVILLE, SC 29010-0573
PO BOX 574, BISHOPVILLE, SC 29010-0574
PO BOX 575, BISHOPVILLE, SC 29010-0575
PO BOX 576, BISHOPVILLE, SC 29010-0576
PO BOX 577, BISHOPVILLE, SC 29010-0577
PO BOX 578, BISHOPVILLE, SC 29010-0578
PO BOX 579, BISHOPVILLE, SC 29010-0579
PO BOX 580, BISHOPVILLE, SC 29010-0580
PO BOX 581, BISHOPVILLE, SC 29010-0581
PO BOX 582, BISHOPVILLE, SC 29010-0582
PO BOX 583, BISHOPVILLE, SC 29010-0583
PO BOX 584, BISHOPVILLE, SC 29010-0584