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, NEW ALEXANDRIA, PA 15670-0401
PO BOX 402, NEW ALEXANDRIA, PA 15670-0402
PO BOX 403, NEW ALEXANDRIA, PA 15670-0403
PO BOX 404, NEW ALEXANDRIA, PA 15670-0404
PO BOX 405, NEW ALEXANDRIA, PA 15670-0405
PO BOX 406, NEW ALEXANDRIA, PA 15670-0406
PO BOX 407, NEW ALEXANDRIA, PA 15670-0407
PO BOX 408, NEW ALEXANDRIA, PA 15670-0408
PO BOX 409, NEW ALEXANDRIA, PA 15670-0409
PO BOX 410, NEW ALEXANDRIA, PA 15670-0410
PO BOX 411, NEW ALEXANDRIA, PA 15670-0411
PO BOX 412, NEW ALEXANDRIA, PA 15670-0412
PO BOX 413, NEW ALEXANDRIA, PA 15670-0413
PO BOX 414, NEW ALEXANDRIA, PA 15670-0414
PO BOX 415, NEW ALEXANDRIA, PA 15670-0415
PO BOX 416, NEW ALEXANDRIA, PA 15670-0416
PO BOX 417, NEW ALEXANDRIA, PA 15670-0417
PO BOX 418, NEW ALEXANDRIA, PA 15670-0418
PO BOX 419, NEW ALEXANDRIA, PA 15670-0419
PO BOX 420, NEW ALEXANDRIA, PA 15670-0420
PO BOX 421, NEW ALEXANDRIA, PA 15670-0421
PO BOX 422, NEW ALEXANDRIA, PA 15670-0422
PO BOX 423, NEW ALEXANDRIA, PA 15670-0423
PO BOX 424, NEW ALEXANDRIA, PA 15670-0424
PO BOX 425, NEW ALEXANDRIA, PA 15670-0425
PO BOX 426, NEW ALEXANDRIA, PA 15670-0426
PO BOX 427, NEW ALEXANDRIA, PA 15670-0427
PO BOX 428, NEW ALEXANDRIA, PA 15670-0428
PO BOX 429, NEW ALEXANDRIA, PA 15670-0429
PO BOX 430, NEW ALEXANDRIA, PA 15670-0430
PO BOX 431, NEW ALEXANDRIA, PA 15670-0431
PO BOX 432, NEW ALEXANDRIA, PA 15670-0432
PO BOX 433, NEW ALEXANDRIA, PA 15670-0433
PO BOX 434, NEW ALEXANDRIA, PA 15670-0434
PO BOX 435, NEW ALEXANDRIA, PA 15670-0435
PO BOX 436, NEW ALEXANDRIA, PA 15670-0436
PO BOX 437, NEW ALEXANDRIA, PA 15670-0437
PO BOX 438, NEW ALEXANDRIA, PA 15670-0438
PO BOX 439, NEW ALEXANDRIA, PA 15670-0439
PO BOX 440, NEW ALEXANDRIA, PA 15670-0440
PO BOX 441, NEW ALEXANDRIA, PA 15670-0441
PO BOX 442, NEW ALEXANDRIA, PA 15670-0442
PO BOX 443, NEW ALEXANDRIA, PA 15670-0443
PO BOX 444, NEW ALEXANDRIA, PA 15670-0444
PO BOX 445, NEW ALEXANDRIA, PA 15670-0445
PO BOX 446, NEW ALEXANDRIA, PA 15670-0446
PO BOX 447, NEW ALEXANDRIA, PA 15670-0447
PO BOX 448, NEW ALEXANDRIA, PA 15670-0448
PO BOX 449, NEW ALEXANDRIA, PA 15670-0449
PO BOX 450, NEW ALEXANDRIA, PA 15670-0450
PO BOX 451, NEW ALEXANDRIA, PA 15670-0451
PO BOX 452, NEW ALEXANDRIA, PA 15670-0452
PO BOX 453, NEW ALEXANDRIA, PA 15670-0453
PO BOX 454, NEW ALEXANDRIA, PA 15670-0454
PO BOX 455, NEW ALEXANDRIA, PA 15670-0455
PO BOX 456, NEW ALEXANDRIA, PA 15670-0456
PO BOX 457, NEW ALEXANDRIA, PA 15670-0457
PO BOX 458, NEW ALEXANDRIA, PA 15670-0458
PO BOX 459, NEW ALEXANDRIA, PA 15670-0459
PO BOX 460, NEW ALEXANDRIA, PA 15670-0460
PO BOX 461, NEW ALEXANDRIA, PA 15670-0461
PO BOX 462, NEW ALEXANDRIA, PA 15670-0462
PO BOX 463, NEW ALEXANDRIA, PA 15670-0463
PO BOX 464, NEW ALEXANDRIA, PA 15670-0464
PO BOX 465, NEW ALEXANDRIA, PA 15670-0465
PO BOX 466, NEW ALEXANDRIA, PA 15670-0466
PO BOX 467, NEW ALEXANDRIA, PA 15670-0467
PO BOX 468, NEW ALEXANDRIA, PA 15670-0468
PO BOX 469, NEW ALEXANDRIA, PA 15670-0469
PO BOX 470, NEW ALEXANDRIA, PA 15670-0470
PO BOX 471, NEW ALEXANDRIA, PA 15670-0471
PO BOX 472, NEW ALEXANDRIA, PA 15670-0472
PO BOX 473, NEW ALEXANDRIA, PA 15670-0473
PO BOX 474, NEW ALEXANDRIA, PA 15670-0474
PO BOX 475, NEW ALEXANDRIA, PA 15670-0475
PO BOX 476, NEW ALEXANDRIA, PA 15670-0476
PO BOX 477, NEW ALEXANDRIA, PA 15670-0477
PO BOX 478, NEW ALEXANDRIA, PA 15670-0478
PO BOX 479, NEW ALEXANDRIA, PA 15670-0479
PO BOX 480, NEW ALEXANDRIA, PA 15670-0480
PO BOX 481, NEW ALEXANDRIA, PA 15670-0481
PO BOX 482, NEW ALEXANDRIA, PA 15670-0482
PO BOX 483, NEW ALEXANDRIA, PA 15670-0483
PO BOX 484, NEW ALEXANDRIA, PA 15670-0484
PO BOX 485, NEW ALEXANDRIA, PA 15670-0485
PO BOX 486, NEW ALEXANDRIA, PA 15670-0486
PO BOX 487, NEW ALEXANDRIA, PA 15670-0487
PO BOX 488, NEW ALEXANDRIA, PA 15670-0488
PO BOX 489, NEW ALEXANDRIA, PA 15670-0489
PO BOX 490, NEW ALEXANDRIA, PA 15670-0490
PO BOX 491, NEW ALEXANDRIA, PA 15670-0491
PO BOX 492, NEW ALEXANDRIA, PA 15670-0492
PO BOX 493, NEW ALEXANDRIA, PA 15670-0493
PO BOX 494, NEW ALEXANDRIA, PA 15670-0494
PO BOX 495, NEW ALEXANDRIA, PA 15670-0495
PO BOX 496, NEW ALEXANDRIA, PA 15670-0496
PO BOX 497, NEW ALEXANDRIA, PA 15670-0497
PO BOX 498, NEW ALEXANDRIA, PA 15670-0498
PO BOX 499, NEW ALEXANDRIA, PA 15670-0499
PO BOX 500, NEW ALEXANDRIA, PA 15670-0500
PO BOX 501, NEW ALEXANDRIA, PA 15670-0501
PO BOX 502, NEW ALEXANDRIA, PA 15670-0502
PO BOX 503, NEW ALEXANDRIA, PA 15670-0503
PO BOX 504, NEW ALEXANDRIA, PA 15670-0504
PO BOX 505, NEW ALEXANDRIA, PA 15670-0505
PO BOX 506, NEW ALEXANDRIA, PA 15670-0506
PO BOX 507, NEW ALEXANDRIA, PA 15670-0507
PO BOX 508, NEW ALEXANDRIA, PA 15670-0508
PO BOX 509, NEW ALEXANDRIA, PA 15670-0509
PO BOX 510, NEW ALEXANDRIA, PA 15670-0510
PO BOX 511, NEW ALEXANDRIA, PA 15670-0511
PO BOX 512, NEW ALEXANDRIA, PA 15670-0512
PO BOX 513, NEW ALEXANDRIA, PA 15670-0513
PO BOX 514, NEW ALEXANDRIA, PA 15670-0514
PO BOX 515, NEW ALEXANDRIA, PA 15670-0515
PO BOX 516, NEW ALEXANDRIA, PA 15670-0516
PO BOX 517, NEW ALEXANDRIA, PA 15670-0517
PO BOX 518, NEW ALEXANDRIA, PA 15670-0518
PO BOX 519, NEW ALEXANDRIA, PA 15670-0519
PO BOX 520, NEW ALEXANDRIA, PA 15670-0520
PO BOX 521, NEW ALEXANDRIA, PA 15670-0521
PO BOX 522, NEW ALEXANDRIA, PA 15670-0522
PO BOX 523, NEW ALEXANDRIA, PA 15670-0523
PO BOX 524, NEW ALEXANDRIA, PA 15670-0524
PO BOX 525, NEW ALEXANDRIA, PA 15670-0525
PO BOX 526, NEW ALEXANDRIA, PA 15670-0526
PO BOX 527, NEW ALEXANDRIA, PA 15670-0527
PO BOX 528, NEW ALEXANDRIA, PA 15670-0528
PO BOX 529, NEW ALEXANDRIA, PA 15670-0529
PO BOX 530, NEW ALEXANDRIA, PA 15670-0530
PO BOX 531, NEW ALEXANDRIA, PA 15670-0531
PO BOX 532, NEW ALEXANDRIA, PA 15670-0532
PO BOX 533, NEW ALEXANDRIA, PA 15670-0533
PO BOX 534, NEW ALEXANDRIA, PA 15670-0534
PO BOX 535, NEW ALEXANDRIA, PA 15670-0535
PO BOX 536, NEW ALEXANDRIA, PA 15670-0536
PO BOX 537, NEW ALEXANDRIA, PA 15670-0537
PO BOX 538, NEW ALEXANDRIA, PA 15670-0538
PO BOX 539, NEW ALEXANDRIA, PA 15670-0539
PO BOX 540, NEW ALEXANDRIA, PA 15670-0540
PO BOX 541, NEW ALEXANDRIA, PA 15670-0541
PO BOX 542, NEW ALEXANDRIA, PA 15670-0542
PO BOX 543, NEW ALEXANDRIA, PA 15670-0543
PO BOX 544, NEW ALEXANDRIA, PA 15670-0544
PO BOX 545, NEW ALEXANDRIA, PA 15670-0545
PO BOX 546, NEW ALEXANDRIA, PA 15670-0546
PO BOX 547, NEW ALEXANDRIA, PA 15670-0547
PO BOX 548, NEW ALEXANDRIA, PA 15670-0548
PO BOX 549, NEW ALEXANDRIA, PA 15670-0549
PO BOX 550, NEW ALEXANDRIA, PA 15670-0550
PO BOX 551, NEW ALEXANDRIA, PA 15670-0551
PO BOX 552, NEW ALEXANDRIA, PA 15670-0552
PO BOX 553, NEW ALEXANDRIA, PA 15670-0553
PO BOX 554, NEW ALEXANDRIA, PA 15670-0554
PO BOX 555, NEW ALEXANDRIA, PA 15670-0555
PO BOX 556, NEW ALEXANDRIA, PA 15670-0556
PO BOX 557, NEW ALEXANDRIA, PA 15670-0557
PO BOX 558, NEW ALEXANDRIA, PA 15670-0558
PO BOX 559, NEW ALEXANDRIA, PA 15670-0559
PO BOX 560, NEW ALEXANDRIA, PA 15670-0560
PO BOX 561, NEW ALEXANDRIA, PA 15670-0561
PO BOX 562, NEW ALEXANDRIA, PA 15670-0562
PO BOX 563, NEW ALEXANDRIA, PA 15670-0563
PO BOX 564, NEW ALEXANDRIA, PA 15670-0564
PO BOX 565, NEW ALEXANDRIA, PA 15670-0565
PO BOX 566, NEW ALEXANDRIA, PA 15670-0566
PO BOX 567, NEW ALEXANDRIA, PA 15670-0567
PO BOX 568, NEW ALEXANDRIA, PA 15670-0568
PO BOX 569, NEW ALEXANDRIA, PA 15670-0569
PO BOX 570, NEW ALEXANDRIA, PA 15670-0570
PO BOX 571, NEW ALEXANDRIA, PA 15670-0571
PO BOX 572, NEW ALEXANDRIA, PA 15670-0572
PO BOX 573, NEW ALEXANDRIA, PA 15670-0573
PO BOX 574, NEW ALEXANDRIA, PA 15670-0574
PO BOX 575, NEW ALEXANDRIA, PA 15670-0575
PO BOX 576, NEW ALEXANDRIA, PA 15670-0576
PO BOX 577, NEW ALEXANDRIA, PA 15670-0577
PO BOX 578, NEW ALEXANDRIA, PA 15670-0578
PO BOX 579, NEW ALEXANDRIA, PA 15670-0579
PO BOX 580, NEW ALEXANDRIA, PA 15670-0580
PO BOX 581, NEW ALEXANDRIA, PA 15670-0581
PO BOX 582, NEW ALEXANDRIA, PA 15670-0582
PO BOX 583, NEW ALEXANDRIA, PA 15670-0583
PO BOX 584, NEW ALEXANDRIA, PA 15670-0584
PO BOX 585, NEW ALEXANDRIA, PA 15670-0585
PO BOX 586, NEW ALEXANDRIA, PA 15670-0586
PO BOX 587, NEW ALEXANDRIA, PA 15670-0587
PO BOX 588, NEW ALEXANDRIA, PA 15670-0588
PO BOX 589, NEW ALEXANDRIA, PA 15670-0589
PO BOX 590, NEW ALEXANDRIA, PA 15670-0590
PO BOX 591, NEW ALEXANDRIA, PA 15670-0591
PO BOX 592, NEW ALEXANDRIA, PA 15670-0592
PO BOX 593, NEW ALEXANDRIA, PA 15670-0593
PO BOX 594, NEW ALEXANDRIA, PA 15670-0594
PO BOX 595, NEW ALEXANDRIA, PA 15670-0595
PO BOX 596, NEW ALEXANDRIA, PA 15670-0596
PO BOX 597, NEW ALEXANDRIA, PA 15670-0597
PO BOX 598, NEW ALEXANDRIA, PA 15670-0598
PO BOX 599, NEW ALEXANDRIA, PA 15670-0599
PO BOX 600, NEW ALEXANDRIA, PA 15670-0600
PO BOX 601, NEW ALEXANDRIA, PA 15670-0601
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