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 401, SOUTH PLAINFIELD, NJ 07080-0401
PO BOX 402, SOUTH PLAINFIELD, NJ 07080-0402
PO BOX 403, SOUTH PLAINFIELD, NJ 07080-0403
PO BOX 404, SOUTH PLAINFIELD, NJ 07080-0404
PO BOX 405, SOUTH PLAINFIELD, NJ 07080-0405
PO BOX 406, SOUTH PLAINFIELD, NJ 07080-0406
PO BOX 407, SOUTH PLAINFIELD, NJ 07080-0407
PO BOX 408, SOUTH PLAINFIELD, NJ 07080-0408
PO BOX 409, SOUTH PLAINFIELD, NJ 07080-0409
PO BOX 410, SOUTH PLAINFIELD, NJ 07080-0410
PO BOX 411, SOUTH PLAINFIELD, NJ 07080-0411
PO BOX 412, SOUTH PLAINFIELD, NJ 07080-0412
PO BOX 413, SOUTH PLAINFIELD, NJ 07080-0413
PO BOX 414, SOUTH PLAINFIELD, NJ 07080-0414
PO BOX 415, SOUTH PLAINFIELD, NJ 07080-0415
PO BOX 416, SOUTH PLAINFIELD, NJ 07080-0416
PO BOX 417, SOUTH PLAINFIELD, NJ 07080-0417
PO BOX 418, SOUTH PLAINFIELD, NJ 07080-0418
PO BOX 419, SOUTH PLAINFIELD, NJ 07080-0419
PO BOX 420, SOUTH PLAINFIELD, NJ 07080-0420
PO BOX 421, SOUTH PLAINFIELD, NJ 07080-0421
PO BOX 422, SOUTH PLAINFIELD, NJ 07080-0422
PO BOX 423, SOUTH PLAINFIELD, NJ 07080-0423
PO BOX 424, SOUTH PLAINFIELD, NJ 07080-0424
PO BOX 425, SOUTH PLAINFIELD, NJ 07080-0425
PO BOX 426, SOUTH PLAINFIELD, NJ 07080-0426
PO BOX 427, SOUTH PLAINFIELD, NJ 07080-0427
PO BOX 428, SOUTH PLAINFIELD, NJ 07080-0428
PO BOX 429, SOUTH PLAINFIELD, NJ 07080-0429
PO BOX 430, SOUTH PLAINFIELD, NJ 07080-0430
PO BOX 431, SOUTH PLAINFIELD, NJ 07080-0431
PO BOX 432, SOUTH PLAINFIELD, NJ 07080-0432
PO BOX 433, SOUTH PLAINFIELD, NJ 07080-0433
PO BOX 434, SOUTH PLAINFIELD, NJ 07080-0434
PO BOX 435, SOUTH PLAINFIELD, NJ 07080-0435
PO BOX 436, SOUTH PLAINFIELD, NJ 07080-0436
PO BOX 437, SOUTH PLAINFIELD, NJ 07080-0437
PO BOX 438, SOUTH PLAINFIELD, NJ 07080-0438
PO BOX 439, SOUTH PLAINFIELD, NJ 07080-0439
PO BOX 440, SOUTH PLAINFIELD, NJ 07080-0440
PO BOX 441, SOUTH PLAINFIELD, NJ 07080-0441
PO BOX 442, SOUTH PLAINFIELD, NJ 07080-0442
PO BOX 443, SOUTH PLAINFIELD, NJ 07080-0443
PO BOX 444, SOUTH PLAINFIELD, NJ 07080-0444
PO BOX 445, SOUTH PLAINFIELD, NJ 07080-0445
PO BOX 446, SOUTH PLAINFIELD, NJ 07080-0446
PO BOX 447, SOUTH PLAINFIELD, NJ 07080-0447
PO BOX 448, SOUTH PLAINFIELD, NJ 07080-0448
PO BOX 449, SOUTH PLAINFIELD, NJ 07080-0449
PO BOX 450, SOUTH PLAINFIELD, NJ 07080-0450
PO BOX 451, SOUTH PLAINFIELD, NJ 07080-0451
PO BOX 452, SOUTH PLAINFIELD, NJ 07080-0452
PO BOX 453, SOUTH PLAINFIELD, NJ 07080-0453
PO BOX 454, SOUTH PLAINFIELD, NJ 07080-0454
PO BOX 455, SOUTH PLAINFIELD, NJ 07080-0455
PO BOX 456, SOUTH PLAINFIELD, NJ 07080-0456
PO BOX 457, SOUTH PLAINFIELD, NJ 07080-0457
PO BOX 458, SOUTH PLAINFIELD, NJ 07080-0458
PO BOX 459, SOUTH PLAINFIELD, NJ 07080-0459
PO BOX 460, SOUTH PLAINFIELD, NJ 07080-0460
PO BOX 461, SOUTH PLAINFIELD, NJ 07080-0461
PO BOX 462, SOUTH PLAINFIELD, NJ 07080-0462
PO BOX 463, SOUTH PLAINFIELD, NJ 07080-0463
PO BOX 464, SOUTH PLAINFIELD, NJ 07080-0464
PO BOX 465, SOUTH PLAINFIELD, NJ 07080-0465
PO BOX 466, SOUTH PLAINFIELD, NJ 07080-0466
PO BOX 467, SOUTH PLAINFIELD, NJ 07080-0467
PO BOX 468, SOUTH PLAINFIELD, NJ 07080-0468
PO BOX 469, SOUTH PLAINFIELD, NJ 07080-0469
PO BOX 470, SOUTH PLAINFIELD, NJ 07080-0470
PO BOX 471, SOUTH PLAINFIELD, NJ 07080-0471
PO BOX 472, SOUTH PLAINFIELD, NJ 07080-0472
PO BOX 473, SOUTH PLAINFIELD, NJ 07080-0473
PO BOX 474, SOUTH PLAINFIELD, NJ 07080-0474
PO BOX 475, SOUTH PLAINFIELD, NJ 07080-0475
PO BOX 476, SOUTH PLAINFIELD, NJ 07080-0476
PO BOX 477, SOUTH PLAINFIELD, NJ 07080-0477
PO BOX 478, SOUTH PLAINFIELD, NJ 07080-0478
PO BOX 479, SOUTH PLAINFIELD, NJ 07080-0479
PO BOX 480, SOUTH PLAINFIELD, NJ 07080-0480
PO BOX 481, SOUTH PLAINFIELD, NJ 07080-0481
PO BOX 482, SOUTH PLAINFIELD, NJ 07080-0482
PO BOX 483, SOUTH PLAINFIELD, NJ 07080-0483
PO BOX 484, SOUTH PLAINFIELD, NJ 07080-0484
PO BOX 485, SOUTH PLAINFIELD, NJ 07080-0485
PO BOX 486, SOUTH PLAINFIELD, NJ 07080-0486
PO BOX 487, SOUTH PLAINFIELD, NJ 07080-0487
PO BOX 488, SOUTH PLAINFIELD, NJ 07080-0488
PO BOX 489, SOUTH PLAINFIELD, NJ 07080-0489
PO BOX 490, SOUTH PLAINFIELD, NJ 07080-0490
PO BOX 491, SOUTH PLAINFIELD, NJ 07080-0491
PO BOX 492, SOUTH PLAINFIELD, NJ 07080-0492
PO BOX 493, SOUTH PLAINFIELD, NJ 07080-0493
PO BOX 494, SOUTH PLAINFIELD, NJ 07080-0494
PO BOX 495, SOUTH PLAINFIELD, NJ 07080-0495
PO BOX 496, SOUTH PLAINFIELD, NJ 07080-0496
PO BOX 497, SOUTH PLAINFIELD, NJ 07080-0497
PO BOX 498, SOUTH PLAINFIELD, NJ 07080-0498
PO BOX 499, SOUTH PLAINFIELD, NJ 07080-0499
PO BOX 500, SOUTH PLAINFIELD, NJ 07080-0500
PO BOX 501, SOUTH PLAINFIELD, NJ 07080-0501
PO BOX 502, SOUTH PLAINFIELD, NJ 07080-0502
PO BOX 503, SOUTH PLAINFIELD, NJ 07080-0503
PO BOX 504, SOUTH PLAINFIELD, NJ 07080-0504
PO BOX 505, SOUTH PLAINFIELD, NJ 07080-0505
PO BOX 506, SOUTH PLAINFIELD, NJ 07080-0506
PO BOX 507, SOUTH PLAINFIELD, NJ 07080-0507
PO BOX 508, SOUTH PLAINFIELD, NJ 07080-0508
PO BOX 509, SOUTH PLAINFIELD, NJ 07080-0509
PO BOX 510, SOUTH PLAINFIELD, NJ 07080-0510
PO BOX 511, SOUTH PLAINFIELD, NJ 07080-0511
PO BOX 512, SOUTH PLAINFIELD, NJ 07080-0512
PO BOX 513, SOUTH PLAINFIELD, NJ 07080-0513
PO BOX 514, SOUTH PLAINFIELD, NJ 07080-0514
PO BOX 515, SOUTH PLAINFIELD, NJ 07080-0515
PO BOX 516, SOUTH PLAINFIELD, NJ 07080-0516
PO BOX 517, SOUTH PLAINFIELD, NJ 07080-0517
PO BOX 518, SOUTH PLAINFIELD, NJ 07080-0518
PO BOX 519, SOUTH PLAINFIELD, NJ 07080-0519
PO BOX 520, SOUTH PLAINFIELD, NJ 07080-0520
PO BOX 521, SOUTH PLAINFIELD, NJ 07080-0521
PO BOX 522, SOUTH PLAINFIELD, NJ 07080-0522
PO BOX 523, SOUTH PLAINFIELD, NJ 07080-0523
PO BOX 524, SOUTH PLAINFIELD, NJ 07080-0524
PO BOX 525, SOUTH PLAINFIELD, NJ 07080-0525
PO BOX 526, SOUTH PLAINFIELD, NJ 07080-0526
PO BOX 527, SOUTH PLAINFIELD, NJ 07080-0527
PO BOX 528, SOUTH PLAINFIELD, NJ 07080-0528
PO BOX 529, SOUTH PLAINFIELD, NJ 07080-0529
PO BOX 530, SOUTH PLAINFIELD, NJ 07080-0530
PO BOX 531, SOUTH PLAINFIELD, NJ 07080-0531
PO BOX 532, SOUTH PLAINFIELD, NJ 07080-0532
PO BOX 533, SOUTH PLAINFIELD, NJ 07080-0533
PO BOX 534, SOUTH PLAINFIELD, NJ 07080-0534
PO BOX 535, SOUTH PLAINFIELD, NJ 07080-0535
PO BOX 536, SOUTH PLAINFIELD, NJ 07080-0536
PO BOX 537, SOUTH PLAINFIELD, NJ 07080-0537
PO BOX 538, SOUTH PLAINFIELD, NJ 07080-0538
PO BOX 539, SOUTH PLAINFIELD, NJ 07080-0539
PO BOX 540, SOUTH PLAINFIELD, NJ 07080-0540
PO BOX 541, SOUTH PLAINFIELD, NJ 07080-0541
PO BOX 542, SOUTH PLAINFIELD, NJ 07080-0542
PO BOX 543, SOUTH PLAINFIELD, NJ 07080-0543
PO BOX 544, SOUTH PLAINFIELD, NJ 07080-0544
PO BOX 545, SOUTH PLAINFIELD, NJ 07080-0545
PO BOX 546, SOUTH PLAINFIELD, NJ 07080-0546
PO BOX 547, SOUTH PLAINFIELD, NJ 07080-0547
PO BOX 548, SOUTH PLAINFIELD, NJ 07080-0548
PO BOX 549, SOUTH PLAINFIELD, NJ 07080-0549
PO BOX 550, SOUTH PLAINFIELD, NJ 07080-0550
PO BOX 551, SOUTH PLAINFIELD, NJ 07080-0551
PO BOX 552, SOUTH PLAINFIELD, NJ 07080-0552
PO BOX 553, SOUTH PLAINFIELD, NJ 07080-0553
PO BOX 554, SOUTH PLAINFIELD, NJ 07080-0554
PO BOX 555, SOUTH PLAINFIELD, NJ 07080-0555
PO BOX 556, SOUTH PLAINFIELD, NJ 07080-0556
PO BOX 557, SOUTH PLAINFIELD, NJ 07080-0557
PO BOX 558, SOUTH PLAINFIELD, NJ 07080-0558
PO BOX 559, SOUTH PLAINFIELD, NJ 07080-0559
PO BOX 560, SOUTH PLAINFIELD, NJ 07080-0560
PO BOX 561, SOUTH PLAINFIELD, NJ 07080-0561
PO BOX 562, SOUTH PLAINFIELD, NJ 07080-0562
PO BOX 563, SOUTH PLAINFIELD, NJ 07080-0563
PO BOX 564, SOUTH PLAINFIELD, NJ 07080-0564
PO BOX 565, SOUTH PLAINFIELD, NJ 07080-0565
PO BOX 566, SOUTH PLAINFIELD, NJ 07080-0566
PO BOX 567, SOUTH PLAINFIELD, NJ 07080-0567
PO BOX 568, SOUTH PLAINFIELD, NJ 07080-0568
PO BOX 569, SOUTH PLAINFIELD, NJ 07080-0569
PO BOX 570, SOUTH PLAINFIELD, NJ 07080-0570
PO BOX 571, SOUTH PLAINFIELD, NJ 07080-0571
PO BOX 572, SOUTH PLAINFIELD, NJ 07080-0572
PO BOX 573, SOUTH PLAINFIELD, NJ 07080-0573
PO BOX 574, SOUTH PLAINFIELD, NJ 07080-0574
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