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, HOLLIDAYSBURG, PA 16648-0401
PO BOX 402, HOLLIDAYSBURG, PA 16648-0402
PO BOX 403, HOLLIDAYSBURG, PA 16648-0403
PO BOX 404, HOLLIDAYSBURG, PA 16648-0404
PO BOX 405, HOLLIDAYSBURG, PA 16648-0405
PO BOX 406, HOLLIDAYSBURG, PA 16648-0406
PO BOX 407, HOLLIDAYSBURG, PA 16648-0407
PO BOX 408, HOLLIDAYSBURG, PA 16648-0408
PO BOX 409, HOLLIDAYSBURG, PA 16648-0409
PO BOX 410, HOLLIDAYSBURG, PA 16648-0410
PO BOX 411, HOLLIDAYSBURG, PA 16648-0411
PO BOX 412, HOLLIDAYSBURG, PA 16648-0412
PO BOX 413, HOLLIDAYSBURG, PA 16648-0413
PO BOX 414, HOLLIDAYSBURG, PA 16648-0414
PO BOX 415, HOLLIDAYSBURG, PA 16648-0415
PO BOX 416, HOLLIDAYSBURG, PA 16648-0416
PO BOX 417, HOLLIDAYSBURG, PA 16648-0417
PO BOX 418, HOLLIDAYSBURG, PA 16648-0418
PO BOX 419, HOLLIDAYSBURG, PA 16648-0419
PO BOX 420, HOLLIDAYSBURG, PA 16648-0420
PO BOX 421, HOLLIDAYSBURG, PA 16648-0421
PO BOX 422, HOLLIDAYSBURG, PA 16648-0422
PO BOX 423, HOLLIDAYSBURG, PA 16648-0423
PO BOX 424, HOLLIDAYSBURG, PA 16648-0424
PO BOX 425, HOLLIDAYSBURG, PA 16648-0425
PO BOX 426, HOLLIDAYSBURG, PA 16648-0426
PO BOX 427, HOLLIDAYSBURG, PA 16648-0427
PO BOX 428, HOLLIDAYSBURG, PA 16648-0428
PO BOX 429, HOLLIDAYSBURG, PA 16648-0429
PO BOX 430, HOLLIDAYSBURG, PA 16648-0430
PO BOX 431, HOLLIDAYSBURG, PA 16648-0431
PO BOX 432, HOLLIDAYSBURG, PA 16648-0432
PO BOX 433, HOLLIDAYSBURG, PA 16648-0433
PO BOX 434, HOLLIDAYSBURG, PA 16648-0434
PO BOX 435, HOLLIDAYSBURG, PA 16648-0435
PO BOX 436, HOLLIDAYSBURG, PA 16648-0436
PO BOX 437, HOLLIDAYSBURG, PA 16648-0437
PO BOX 438, HOLLIDAYSBURG, PA 16648-0438
PO BOX 439, HOLLIDAYSBURG, PA 16648-0439
PO BOX 440, HOLLIDAYSBURG, PA 16648-0440
PO BOX 441, HOLLIDAYSBURG, PA 16648-0441
PO BOX 442, HOLLIDAYSBURG, PA 16648-0442
PO BOX 443, HOLLIDAYSBURG, PA 16648-0443
PO BOX 444, HOLLIDAYSBURG, PA 16648-0444
PO BOX 445, HOLLIDAYSBURG, PA 16648-0445
PO BOX 446, HOLLIDAYSBURG, PA 16648-0446
PO BOX 447, HOLLIDAYSBURG, PA 16648-0447
PO BOX 448, HOLLIDAYSBURG, PA 16648-0448
PO BOX 449, HOLLIDAYSBURG, PA 16648-0449
PO BOX 450, HOLLIDAYSBURG, PA 16648-0450
PO BOX 451, HOLLIDAYSBURG, PA 16648-0451
PO BOX 452, HOLLIDAYSBURG, PA 16648-0452
PO BOX 453, HOLLIDAYSBURG, PA 16648-0453
PO BOX 454, HOLLIDAYSBURG, PA 16648-0454
PO BOX 455, HOLLIDAYSBURG, PA 16648-0455
PO BOX 456, HOLLIDAYSBURG, PA 16648-0456
PO BOX 457, HOLLIDAYSBURG, PA 16648-0457
PO BOX 458, HOLLIDAYSBURG, PA 16648-0458
PO BOX 459, HOLLIDAYSBURG, PA 16648-0459
PO BOX 460, HOLLIDAYSBURG, PA 16648-0460
PO BOX 461, HOLLIDAYSBURG, PA 16648-0461
PO BOX 462, HOLLIDAYSBURG, PA 16648-0462
PO BOX 463, HOLLIDAYSBURG, PA 16648-0463
PO BOX 464, HOLLIDAYSBURG, PA 16648-0464
PO BOX 465, HOLLIDAYSBURG, PA 16648-0465
PO BOX 466, HOLLIDAYSBURG, PA 16648-0466
PO BOX 467, HOLLIDAYSBURG, PA 16648-0467
PO BOX 468, HOLLIDAYSBURG, PA 16648-0468
PO BOX 469, HOLLIDAYSBURG, PA 16648-0469
PO BOX 470, HOLLIDAYSBURG, PA 16648-0470
PO BOX 471, HOLLIDAYSBURG, PA 16648-0471
PO BOX 472, HOLLIDAYSBURG, PA 16648-0472
PO BOX 473, HOLLIDAYSBURG, PA 16648-0473
PO BOX 474, HOLLIDAYSBURG, PA 16648-0474
PO BOX 475, HOLLIDAYSBURG, PA 16648-0475
PO BOX 476, HOLLIDAYSBURG, PA 16648-0476
PO BOX 477, HOLLIDAYSBURG, PA 16648-0477
PO BOX 478, HOLLIDAYSBURG, PA 16648-0478
PO BOX 479, HOLLIDAYSBURG, PA 16648-0479
PO BOX 480, HOLLIDAYSBURG, PA 16648-0480
PO BOX 481, HOLLIDAYSBURG, PA 16648-0481
PO BOX 482, HOLLIDAYSBURG, PA 16648-0482
PO BOX 483, HOLLIDAYSBURG, PA 16648-0483
PO BOX 484, HOLLIDAYSBURG, PA 16648-0484
PO BOX 485, HOLLIDAYSBURG, PA 16648-0485
PO BOX 486, HOLLIDAYSBURG, PA 16648-0486
PO BOX 487, HOLLIDAYSBURG, PA 16648-0487
PO BOX 488, HOLLIDAYSBURG, PA 16648-0488
PO BOX 489, HOLLIDAYSBURG, PA 16648-0489
PO BOX 490, HOLLIDAYSBURG, PA 16648-0490
PO BOX 491, HOLLIDAYSBURG, PA 16648-0491
PO BOX 492, HOLLIDAYSBURG, PA 16648-0492
PO BOX 493, HOLLIDAYSBURG, PA 16648-0493
PO BOX 494, HOLLIDAYSBURG, PA 16648-0494
PO BOX 495, HOLLIDAYSBURG, PA 16648-0495
PO BOX 496, HOLLIDAYSBURG, PA 16648-0496
PO BOX 497, HOLLIDAYSBURG, PA 16648-0497
PO BOX 498, HOLLIDAYSBURG, PA 16648-0498
PO BOX 499, HOLLIDAYSBURG, PA 16648-0499
PO BOX 500, HOLLIDAYSBURG, PA 16648-0500
PO BOX 501, HOLLIDAYSBURG, PA 16648-0501
PO BOX 502, HOLLIDAYSBURG, PA 16648-0502
PO BOX 503, HOLLIDAYSBURG, PA 16648-0503
PO BOX 504, HOLLIDAYSBURG, PA 16648-0504
PO BOX 505, HOLLIDAYSBURG, PA 16648-0505
PO BOX 506, HOLLIDAYSBURG, PA 16648-0506
PO BOX 507, HOLLIDAYSBURG, PA 16648-0507
PO BOX 508, HOLLIDAYSBURG, PA 16648-0508
PO BOX 509, HOLLIDAYSBURG, PA 16648-0509
PO BOX 510, HOLLIDAYSBURG, PA 16648-0510
PO BOX 511, HOLLIDAYSBURG, PA 16648-0511
PO BOX 512, HOLLIDAYSBURG, PA 16648-0512
PO BOX 513, HOLLIDAYSBURG, PA 16648-0513
PO BOX 514, HOLLIDAYSBURG, PA 16648-0514
PO BOX 515, HOLLIDAYSBURG, PA 16648-0515
PO BOX 516, HOLLIDAYSBURG, PA 16648-0516
PO BOX 517, HOLLIDAYSBURG, PA 16648-0517
PO BOX 518, HOLLIDAYSBURG, PA 16648-0518
PO BOX 519, HOLLIDAYSBURG, PA 16648-0519
PO BOX 520, HOLLIDAYSBURG, PA 16648-0520
PO BOX 521, HOLLIDAYSBURG, PA 16648-0521
PO BOX 522, HOLLIDAYSBURG, PA 16648-0522
PO BOX 523, HOLLIDAYSBURG, PA 16648-0523
PO BOX 524, HOLLIDAYSBURG, PA 16648-0524
PO BOX 525, HOLLIDAYSBURG, PA 16648-0525
PO BOX 526, HOLLIDAYSBURG, PA 16648-0526
PO BOX 527, HOLLIDAYSBURG, PA 16648-0527
PO BOX 528, HOLLIDAYSBURG, PA 16648-0528
PO BOX 529, HOLLIDAYSBURG, PA 16648-0529
PO BOX 530, HOLLIDAYSBURG, PA 16648-0530
PO BOX 531, HOLLIDAYSBURG, PA 16648-0531
PO BOX 532, HOLLIDAYSBURG, PA 16648-0532
PO BOX 533, HOLLIDAYSBURG, PA 16648-0533
PO BOX 534, HOLLIDAYSBURG, PA 16648-0534
PO BOX 535, HOLLIDAYSBURG, PA 16648-0535
PO BOX 536, HOLLIDAYSBURG, PA 16648-0536
PO BOX 537, HOLLIDAYSBURG, PA 16648-0537
PO BOX 538, HOLLIDAYSBURG, PA 16648-0538
PO BOX 539, HOLLIDAYSBURG, PA 16648-0539
PO BOX 540, HOLLIDAYSBURG, PA 16648-0540
PO BOX 541, HOLLIDAYSBURG, PA 16648-0541
PO BOX 542, HOLLIDAYSBURG, PA 16648-0542
PO BOX 543, HOLLIDAYSBURG, PA 16648-0543
PO BOX 544, HOLLIDAYSBURG, PA 16648-0544
PO BOX 545, HOLLIDAYSBURG, PA 16648-0545
PO BOX 546, HOLLIDAYSBURG, PA 16648-0546
PO BOX 547, HOLLIDAYSBURG, PA 16648-0547
PO BOX 548, HOLLIDAYSBURG, PA 16648-0548
PO BOX 549, HOLLIDAYSBURG, PA 16648-0549
PO BOX 550, HOLLIDAYSBURG, PA 16648-0550
PO BOX 551, HOLLIDAYSBURG, PA 16648-0551
PO BOX 552, HOLLIDAYSBURG, PA 16648-0552
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