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 381, LOCK HAVEN, PA 17745-0381
PO BOX 382, LOCK HAVEN, PA 17745-0382
PO BOX 383, LOCK HAVEN, PA 17745-0383
PO BOX 384, LOCK HAVEN, PA 17745-0384
PO BOX 385, LOCK HAVEN, PA 17745-0385
PO BOX 386, LOCK HAVEN, PA 17745-0386
PO BOX 387, LOCK HAVEN, PA 17745-0387
PO BOX 388, LOCK HAVEN, PA 17745-0388
PO BOX 389, LOCK HAVEN, PA 17745-0389
PO BOX 390, LOCK HAVEN, PA 17745-0390
PO BOX 391, LOCK HAVEN, PA 17745-0391
PO BOX 392, LOCK HAVEN, PA 17745-0392
PO BOX 393, LOCK HAVEN, PA 17745-0393
PO BOX 394, LOCK HAVEN, PA 17745-0394
PO BOX 395, LOCK HAVEN, PA 17745-0395
PO BOX 396, LOCK HAVEN, PA 17745-0396
PO BOX 397, LOCK HAVEN, PA 17745-0397
PO BOX 398, LOCK HAVEN, PA 17745-0398
PO BOX 399, LOCK HAVEN, PA 17745-0399
PO BOX 400, LOCK HAVEN, PA 17745-0400
PO BOX 401, LOCK HAVEN, PA 17745-0401
PO BOX 402, LOCK HAVEN, PA 17745-0402
PO BOX 403, LOCK HAVEN, PA 17745-0403
PO BOX 404, LOCK HAVEN, PA 17745-0404
PO BOX 405, LOCK HAVEN, PA 17745-0405
PO BOX 406, LOCK HAVEN, PA 17745-0406
PO BOX 407, LOCK HAVEN, PA 17745-0407
PO BOX 408, LOCK HAVEN, PA 17745-0408
PO BOX 409, LOCK HAVEN, PA 17745-0409
PO BOX 410, LOCK HAVEN, PA 17745-0410
PO BOX 411, LOCK HAVEN, PA 17745-0411
PO BOX 412, LOCK HAVEN, PA 17745-0412
PO BOX 413, LOCK HAVEN, PA 17745-0413
PO BOX 414, LOCK HAVEN, PA 17745-0414
PO BOX 415, LOCK HAVEN, PA 17745-0415
PO BOX 416, LOCK HAVEN, PA 17745-0416
PO BOX 417, LOCK HAVEN, PA 17745-0417
PO BOX 418, LOCK HAVEN, PA 17745-0418
PO BOX 419, LOCK HAVEN, PA 17745-0419
PO BOX 420, LOCK HAVEN, PA 17745-0420
PO BOX 421, LOCK HAVEN, PA 17745-0421
PO BOX 422, LOCK HAVEN, PA 17745-0422
PO BOX 423, LOCK HAVEN, PA 17745-0423
PO BOX 424, LOCK HAVEN, PA 17745-0424
PO BOX 425, LOCK HAVEN, PA 17745-0425
PO BOX 426, LOCK HAVEN, PA 17745-0426
PO BOX 427, LOCK HAVEN, PA 17745-0427
PO BOX 428, LOCK HAVEN, PA 17745-0428
PO BOX 429, LOCK HAVEN, PA 17745-0429
PO BOX 430, LOCK HAVEN, PA 17745-0430
PO BOX 431, LOCK HAVEN, PA 17745-0431
PO BOX 432, LOCK HAVEN, PA 17745-0432
PO BOX 433, LOCK HAVEN, PA 17745-0433
PO BOX 434, LOCK HAVEN, PA 17745-0434
PO BOX 435, LOCK HAVEN, PA 17745-0435
PO BOX 436, LOCK HAVEN, PA 17745-0436
PO BOX 437, LOCK HAVEN, PA 17745-0437
PO BOX 438, LOCK HAVEN, PA 17745-0438
PO BOX 439, LOCK HAVEN, PA 17745-0439
PO BOX 440, LOCK HAVEN, PA 17745-0440
PO BOX 441, LOCK HAVEN, PA 17745-0441
PO BOX 442, LOCK HAVEN, PA 17745-0442
PO BOX 443, LOCK HAVEN, PA 17745-0443
PO BOX 444, LOCK HAVEN, PA 17745-0444
PO BOX 445, LOCK HAVEN, PA 17745-0445
PO BOX 446, LOCK HAVEN, PA 17745-0446
PO BOX 447, LOCK HAVEN, PA 17745-0447
PO BOX 448, LOCK HAVEN, PA 17745-0448
PO BOX 449, LOCK HAVEN, PA 17745-0449
PO BOX 450, LOCK HAVEN, PA 17745-0450
PO BOX 451, LOCK HAVEN, PA 17745-0451
PO BOX 452, LOCK HAVEN, PA 17745-0452
PO BOX 453, LOCK HAVEN, PA 17745-0453
PO BOX 454, LOCK HAVEN, PA 17745-0454
PO BOX 455, LOCK HAVEN, PA 17745-0455
PO BOX 456, LOCK HAVEN, PA 17745-0456
PO BOX 457, LOCK HAVEN, PA 17745-0457
PO BOX 458, LOCK HAVEN, PA 17745-0458
PO BOX 459, LOCK HAVEN, PA 17745-0459
PO BOX 460, LOCK HAVEN, PA 17745-0460
PO BOX 461, LOCK HAVEN, PA 17745-0461
PO BOX 462, LOCK HAVEN, PA 17745-0462
PO BOX 463, LOCK HAVEN, PA 17745-0463
PO BOX 464, LOCK HAVEN, PA 17745-0464
PO BOX 465, LOCK HAVEN, PA 17745-0465
PO BOX 466, LOCK HAVEN, PA 17745-0466
PO BOX 467, LOCK HAVEN, PA 17745-0467
PO BOX 468, LOCK HAVEN, PA 17745-0468
PO BOX 469, LOCK HAVEN, PA 17745-0469
PO BOX 470, LOCK HAVEN, PA 17745-0470
PO BOX 471, LOCK HAVEN, PA 17745-0471
PO BOX 472, LOCK HAVEN, PA 17745-0472
PO BOX 473, LOCK HAVEN, PA 17745-0473
PO BOX 474, LOCK HAVEN, PA 17745-0474
PO BOX 475, LOCK HAVEN, PA 17745-0475
PO BOX 476, LOCK HAVEN, PA 17745-0476
PO BOX 477, LOCK HAVEN, PA 17745-0477
PO BOX 478, LOCK HAVEN, PA 17745-0478
PO BOX 479, LOCK HAVEN, PA 17745-0479
PO BOX 480, LOCK HAVEN, PA 17745-0480
PO BOX 481, LOCK HAVEN, PA 17745-0481
PO BOX 482, LOCK HAVEN, PA 17745-0482
PO BOX 483, LOCK HAVEN, PA 17745-0483
PO BOX 484, LOCK HAVEN, PA 17745-0484
PO BOX 485, LOCK HAVEN, PA 17745-0485
PO BOX 486, LOCK HAVEN, PA 17745-0486
PO BOX 487, LOCK HAVEN, PA 17745-0487
PO BOX 488, LOCK HAVEN, PA 17745-0488
PO BOX 489, LOCK HAVEN, PA 17745-0489
PO BOX 490, LOCK HAVEN, PA 17745-0490
PO BOX 491, LOCK HAVEN, PA 17745-0491
PO BOX 492, LOCK HAVEN, PA 17745-0492
PO BOX 493, LOCK HAVEN, PA 17745-0493
PO BOX 494, LOCK HAVEN, PA 17745-0494
PO BOX 495, LOCK HAVEN, PA 17745-0495
PO BOX 496, LOCK HAVEN, PA 17745-0496
PO BOX 497, LOCK HAVEN, PA 17745-0497
PO BOX 498, LOCK HAVEN, PA 17745-0498
PO BOX 499, LOCK HAVEN, PA 17745-0499
PO BOX 500, LOCK HAVEN, PA 17745-0500
PO BOX 501, LOCK HAVEN, PA 17745-0501
PO BOX 502, LOCK HAVEN, PA 17745-0502
PO BOX 503, LOCK HAVEN, PA 17745-0503
PO BOX 504, LOCK HAVEN, PA 17745-0504
PO BOX 505, LOCK HAVEN, PA 17745-0505
PO BOX 506, LOCK HAVEN, PA 17745-0506
PO BOX 507, LOCK HAVEN, PA 17745-0507
PO BOX 508, LOCK HAVEN, PA 17745-0508
PO BOX 509, LOCK HAVEN, PA 17745-0509
PO BOX 510, LOCK HAVEN, PA 17745-0510
PO BOX 511, LOCK HAVEN, PA 17745-0511
PO BOX 512, LOCK HAVEN, PA 17745-0512
PO BOX 513, LOCK HAVEN, PA 17745-0513
PO BOX 514, LOCK HAVEN, PA 17745-0514
PO BOX 515, LOCK HAVEN, PA 17745-0515
PO BOX 516, LOCK HAVEN, PA 17745-0516
PO BOX 517, LOCK HAVEN, PA 17745-0517
PO BOX 518, LOCK HAVEN, PA 17745-0518
PO BOX 519, LOCK HAVEN, PA 17745-0519
PO BOX 520, LOCK HAVEN, PA 17745-0520
PO BOX 521, LOCK HAVEN, PA 17745-0521
PO BOX 522, LOCK HAVEN, PA 17745-0522
PO BOX 523, LOCK HAVEN, PA 17745-0523
PO BOX 524, LOCK HAVEN, PA 17745-0524
PO BOX 525, LOCK HAVEN, PA 17745-0525
PO BOX 526, LOCK HAVEN, PA 17745-0526
PO BOX 527, LOCK HAVEN, PA 17745-0527
PO BOX 528, LOCK HAVEN, PA 17745-0528
PO BOX 529, LOCK HAVEN, PA 17745-0529
PO BOX 530, LOCK HAVEN, PA 17745-0530
PO BOX 531, LOCK HAVEN, PA 17745-0531
PO BOX 532, LOCK HAVEN, PA 17745-0532
PO BOX 533, LOCK HAVEN, PA 17745-0533
PO BOX 534, LOCK HAVEN, PA 17745-0534
PO BOX 535, LOCK HAVEN, PA 17745-0535
PO BOX 536, LOCK HAVEN, PA 17745-0536
PO BOX 537, LOCK HAVEN, PA 17745-0537
PO BOX 538, LOCK HAVEN, PA 17745-0538
PO BOX 539, LOCK HAVEN, PA 17745-0539
PO BOX 540, LOCK HAVEN, PA 17745-0540
PO BOX 541, LOCK HAVEN, PA 17745-0541
PO BOX 542, LOCK HAVEN, PA 17745-0542
PO BOX 543, LOCK HAVEN, PA 17745-0543
PO BOX 544, LOCK HAVEN, PA 17745-0544
PO BOX 545, LOCK HAVEN, PA 17745-0545
PO BOX 546, LOCK HAVEN, PA 17745-0546
PO BOX 547, LOCK HAVEN, PA 17745-0547
PO BOX 548, LOCK HAVEN, PA 17745-0548
PO BOX 549, LOCK HAVEN, PA 17745-0549
PO BOX 550, LOCK HAVEN, PA 17745-0550
PO BOX 551, LOCK HAVEN, PA 17745-0551
PO BOX 552, LOCK HAVEN, PA 17745-0552
PO BOX 553, LOCK HAVEN, PA 17745-0553
PO BOX 554, LOCK HAVEN, PA 17745-0554
PO BOX 555, LOCK HAVEN, PA 17745-0555
PO BOX 556, LOCK HAVEN, PA 17745-0556
PO BOX 557, LOCK HAVEN, PA 17745-0557
PO BOX 558, LOCK HAVEN, PA 17745-0558
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