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, WHITE RIVER JUNCTION, VT 05001-0421
PO BOX 422, WHITE RIVER JUNCTION, VT 05001-0422
PO BOX 423, WHITE RIVER JUNCTION, VT 05001-0423
PO BOX 424, WHITE RIVER JUNCTION, VT 05001-0424
PO BOX 425, WHITE RIVER JUNCTION, VT 05001-0425
PO BOX 426, WHITE RIVER JUNCTION, VT 05001-0426
PO BOX 427, WHITE RIVER JUNCTION, VT 05001-0427
PO BOX 428, WHITE RIVER JUNCTION, VT 05001-0428
PO BOX 429, WHITE RIVER JUNCTION, VT 05001-0429
PO BOX 430, WHITE RIVER JUNCTION, VT 05001-0430
PO BOX 431, WHITE RIVER JUNCTION, VT 05001-0431
PO BOX 432, WHITE RIVER JUNCTION, VT 05001-0432
PO BOX 433, WHITE RIVER JUNCTION, VT 05001-0433
PO BOX 434, WHITE RIVER JUNCTION, VT 05001-0434
PO BOX 435, WHITE RIVER JUNCTION, VT 05001-0435
PO BOX 436, WHITE RIVER JUNCTION, VT 05001-0436
PO BOX 437, WHITE RIVER JUNCTION, VT 05001-0437
PO BOX 438, WHITE RIVER JUNCTION, VT 05001-0438
PO BOX 439, WHITE RIVER JUNCTION, VT 05001-0439
PO BOX 440, WHITE RIVER JUNCTION, VT 05001-0440
PO BOX 441, WHITE RIVER JUNCTION, VT 05001-0441
PO BOX 442, WHITE RIVER JUNCTION, VT 05001-0442
PO BOX 443, WHITE RIVER JUNCTION, VT 05001-0443
PO BOX 444, WHITE RIVER JUNCTION, VT 05001-0444
PO BOX 445, WHITE RIVER JUNCTION, VT 05001-0445
PO BOX 446, WHITE RIVER JUNCTION, VT 05001-0446
PO BOX 447, WHITE RIVER JUNCTION, VT 05001-0447
PO BOX 448, WHITE RIVER JUNCTION, VT 05001-0448
PO BOX 449, WHITE RIVER JUNCTION, VT 05001-0449
PO BOX 450, WHITE RIVER JUNCTION, VT 05001-0450
PO BOX 451, WHITE RIVER JUNCTION, VT 05001-0451
PO BOX 452, WHITE RIVER JUNCTION, VT 05001-0452
PO BOX 453, WHITE RIVER JUNCTION, VT 05001-0453
PO BOX 454, WHITE RIVER JUNCTION, VT 05001-0454
PO BOX 455, WHITE RIVER JUNCTION, VT 05001-0455
PO BOX 456, WHITE RIVER JUNCTION, VT 05001-0456
PO BOX 457, WHITE RIVER JUNCTION, VT 05001-0457
PO BOX 458, WHITE RIVER JUNCTION, VT 05001-0458
PO BOX 459, WHITE RIVER JUNCTION, VT 05001-0459
PO BOX 460, WHITE RIVER JUNCTION, VT 05001-0460
PO BOX 461, WHITE RIVER JUNCTION, VT 05001-0461
PO BOX 462, WHITE RIVER JUNCTION, VT 05001-0462
PO BOX 463, WHITE RIVER JUNCTION, VT 05001-0463
PO BOX 464, WHITE RIVER JUNCTION, VT 05001-0464
PO BOX 465, WHITE RIVER JUNCTION, VT 05001-0465
PO BOX 466, WHITE RIVER JUNCTION, VT 05001-0466
PO BOX 467, WHITE RIVER JUNCTION, VT 05001-0467
PO BOX 468, WHITE RIVER JUNCTION, VT 05001-0468
PO BOX 469, WHITE RIVER JUNCTION, VT 05001-0469
PO BOX 470, WHITE RIVER JUNCTION, VT 05001-0470
PO BOX 471, WHITE RIVER JUNCTION, VT 05001-0471
PO BOX 472, WHITE RIVER JUNCTION, VT 05001-0472
PO BOX 473, WHITE RIVER JUNCTION, VT 05001-0473
PO BOX 474, WHITE RIVER JUNCTION, VT 05001-0474
PO BOX 475, WHITE RIVER JUNCTION, VT 05001-0475
PO BOX 476, WHITE RIVER JUNCTION, VT 05001-0476
PO BOX 477, WHITE RIVER JUNCTION, VT 05001-0477
PO BOX 478, WHITE RIVER JUNCTION, VT 05001-0478
PO BOX 479, WHITE RIVER JUNCTION, VT 05001-0479
PO BOX 480, WHITE RIVER JUNCTION, VT 05001-0480
PO BOX 481, WHITE RIVER JUNCTION, VT 05001-0481
PO BOX 482, WHITE RIVER JUNCTION, VT 05001-0482
PO BOX 483, WHITE RIVER JUNCTION, VT 05001-0483
PO BOX 484, WHITE RIVER JUNCTION, VT 05001-0484
PO BOX 485, WHITE RIVER JUNCTION, VT 05001-0485
PO BOX 486, WHITE RIVER JUNCTION, VT 05001-0486
PO BOX 487, WHITE RIVER JUNCTION, VT 05001-0487
PO BOX 488, WHITE RIVER JUNCTION, VT 05001-0488
PO BOX 489, WHITE RIVER JUNCTION, VT 05001-0489
PO BOX 490, WHITE RIVER JUNCTION, VT 05001-0490
PO BOX 491, WHITE RIVER JUNCTION, VT 05001-0491
PO BOX 492, WHITE RIVER JUNCTION, VT 05001-0492
PO BOX 493, WHITE RIVER JUNCTION, VT 05001-0493
PO BOX 494, WHITE RIVER JUNCTION, VT 05001-0494
PO BOX 495, WHITE RIVER JUNCTION, VT 05001-0495
PO BOX 496, WHITE RIVER JUNCTION, VT 05001-0496
PO BOX 497, WHITE RIVER JUNCTION, VT 05001-0497
PO BOX 498, WHITE RIVER JUNCTION, VT 05001-0498
PO BOX 499, WHITE RIVER JUNCTION, VT 05001-0499
PO BOX 500, WHITE RIVER JUNCTION, VT 05001-0500
PO BOX 501, WHITE RIVER JUNCTION, VT 05001-0501
PO BOX 502, WHITE RIVER JUNCTION, VT 05001-0502
PO BOX 503, WHITE RIVER JUNCTION, VT 05001-0503
PO BOX 504, WHITE RIVER JUNCTION, VT 05001-0504
PO BOX 505, WHITE RIVER JUNCTION, VT 05001-0505
PO BOX 506, WHITE RIVER JUNCTION, VT 05001-0506
PO BOX 507, WHITE RIVER JUNCTION, VT 05001-0507
PO BOX 508, WHITE RIVER JUNCTION, VT 05001-0508
PO BOX 509, WHITE RIVER JUNCTION, VT 05001-0509
PO BOX 510, WHITE RIVER JUNCTION, VT 05001-0510
PO BOX 511, WHITE RIVER JUNCTION, VT 05001-0511
PO BOX 512, WHITE RIVER JUNCTION, VT 05001-0512
PO BOX 513, WHITE RIVER JUNCTION, VT 05001-0513
PO BOX 514, WHITE RIVER JUNCTION, VT 05001-0514
PO BOX 515, WHITE RIVER JUNCTION, VT 05001-0515
PO BOX 516, WHITE RIVER JUNCTION, VT 05001-0516
PO BOX 517, WHITE RIVER JUNCTION, VT 05001-0517
PO BOX 518, WHITE RIVER JUNCTION, VT 05001-0518
PO BOX 519, WHITE RIVER JUNCTION, VT 05001-0519
PO BOX 520, WHITE RIVER JUNCTION, VT 05001-0520
PO BOX 521, WHITE RIVER JUNCTION, VT 05001-0521
PO BOX 522, WHITE RIVER JUNCTION, VT 05001-0522
PO BOX 523, WHITE RIVER JUNCTION, VT 05001-0523
PO BOX 524, WHITE RIVER JUNCTION, VT 05001-0524
PO BOX 525, WHITE RIVER JUNCTION, VT 05001-0525
PO BOX 526, WHITE RIVER JUNCTION, VT 05001-0526
PO BOX 527, WHITE RIVER JUNCTION, VT 05001-0527
PO BOX 528, WHITE RIVER JUNCTION, VT 05001-0528
PO BOX 529, WHITE RIVER JUNCTION, VT 05001-0529
PO BOX 530, WHITE RIVER JUNCTION, VT 05001-0530
PO BOX 531, WHITE RIVER JUNCTION, VT 05001-0531
PO BOX 532, WHITE RIVER JUNCTION, VT 05001-0532
PO BOX 533, WHITE RIVER JUNCTION, VT 05001-0533
PO BOX 534, WHITE RIVER JUNCTION, VT 05001-0534
PO BOX 535, WHITE RIVER JUNCTION, VT 05001-0535
PO BOX 536, WHITE RIVER JUNCTION, VT 05001-0536
PO BOX 537, WHITE RIVER JUNCTION, VT 05001-0537
PO BOX 538, WHITE RIVER JUNCTION, VT 05001-0538
PO BOX 539, WHITE RIVER JUNCTION, VT 05001-0539
PO BOX 540, WHITE RIVER JUNCTION, VT 05001-0540
PO BOX 541, WHITE RIVER JUNCTION, VT 05001-0541
PO BOX 542, WHITE RIVER JUNCTION, VT 05001-0542
PO BOX 543, WHITE RIVER JUNCTION, VT 05001-0543
PO BOX 544, WHITE RIVER JUNCTION, VT 05001-0544
PO BOX 545, WHITE RIVER JUNCTION, VT 05001-0545
PO BOX 546, WHITE RIVER JUNCTION, VT 05001-0546
PO BOX 547, WHITE RIVER JUNCTION, VT 05001-0547
PO BOX 548, WHITE RIVER JUNCTION, VT 05001-0548
PO BOX 549, WHITE RIVER JUNCTION, VT 05001-0549
PO BOX 550, WHITE RIVER JUNCTION, VT 05001-0550
PO BOX 551, WHITE RIVER JUNCTION, VT 05001-0551
PO BOX 552, WHITE RIVER JUNCTION, VT 05001-0552
PO BOX 553, WHITE RIVER JUNCTION, VT 05001-0553
PO BOX 554, WHITE RIVER JUNCTION, VT 05001-0554
PO BOX 555, WHITE RIVER JUNCTION, VT 05001-0555
PO BOX 556, WHITE RIVER JUNCTION, VT 05001-0556
PO BOX 557, WHITE RIVER JUNCTION, VT 05001-0557
PO BOX 558, WHITE RIVER JUNCTION, VT 05001-0558
PO BOX 559, WHITE RIVER JUNCTION, VT 05001-0559
PO BOX 560, WHITE RIVER JUNCTION, VT 05001-0560
PO BOX 561, WHITE RIVER JUNCTION, VT 05001-0561
PO BOX 562, WHITE RIVER JUNCTION, VT 05001-0562
PO BOX 563, WHITE RIVER JUNCTION, VT 05001-0563
PO BOX 564, WHITE RIVER JUNCTION, VT 05001-0564
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