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 361, PHILIPSBURG, MT 59858-0361
PO BOX 362, PHILIPSBURG, MT 59858-0362
PO BOX 363, PHILIPSBURG, MT 59858-0363
PO BOX 364, PHILIPSBURG, MT 59858-0364
PO BOX 365, PHILIPSBURG, MT 59858-0365
PO BOX 366, PHILIPSBURG, MT 59858-0366
PO BOX 367, PHILIPSBURG, MT 59858-0367
PO BOX 368, PHILIPSBURG, MT 59858-0368
PO BOX 369, PHILIPSBURG, MT 59858-0369
PO BOX 370, PHILIPSBURG, MT 59858-0370
PO BOX 371, PHILIPSBURG, MT 59858-0371
PO BOX 372, PHILIPSBURG, MT 59858-0372
PO BOX 373, PHILIPSBURG, MT 59858-0373
PO BOX 374, PHILIPSBURG, MT 59858-0374
PO BOX 375, PHILIPSBURG, MT 59858-0375
PO BOX 376, PHILIPSBURG, MT 59858-0376
PO BOX 377, PHILIPSBURG, MT 59858-0377
PO BOX 378, PHILIPSBURG, MT 59858-0378
PO BOX 379, PHILIPSBURG, MT 59858-0379
PO BOX 380, PHILIPSBURG, MT 59858-0380
PO BOX 381, PHILIPSBURG, MT 59858-0381
PO BOX 382, PHILIPSBURG, MT 59858-0382
PO BOX 383, PHILIPSBURG, MT 59858-0383
PO BOX 384, PHILIPSBURG, MT 59858-0384
PO BOX 385, PHILIPSBURG, MT 59858-0385
PO BOX 386, PHILIPSBURG, MT 59858-0386
PO BOX 387, PHILIPSBURG, MT 59858-0387
PO BOX 388, PHILIPSBURG, MT 59858-0388
PO BOX 389, PHILIPSBURG, MT 59858-0389
PO BOX 390, PHILIPSBURG, MT 59858-0390
PO BOX 391, PHILIPSBURG, MT 59858-0391
PO BOX 392, PHILIPSBURG, MT 59858-0392
PO BOX 393, PHILIPSBURG, MT 59858-0393
PO BOX 394, PHILIPSBURG, MT 59858-0394
PO BOX 395, PHILIPSBURG, MT 59858-0395
PO BOX 396, PHILIPSBURG, MT 59858-0396
PO BOX 397, PHILIPSBURG, MT 59858-0397
PO BOX 398, PHILIPSBURG, MT 59858-0398
PO BOX 399, PHILIPSBURG, MT 59858-0399
PO BOX 400, PHILIPSBURG, MT 59858-0400
PO BOX 401, PHILIPSBURG, MT 59858-0401
PO BOX 402, PHILIPSBURG, MT 59858-0402
PO BOX 403, PHILIPSBURG, MT 59858-0403
PO BOX 404, PHILIPSBURG, MT 59858-0404
PO BOX 405, PHILIPSBURG, MT 59858-0405
PO BOX 406, PHILIPSBURG, MT 59858-0406
PO BOX 407, PHILIPSBURG, MT 59858-0407
PO BOX 408, PHILIPSBURG, MT 59858-0408
PO BOX 409, PHILIPSBURG, MT 59858-0409
PO BOX 410, PHILIPSBURG, MT 59858-0410
PO BOX 411, PHILIPSBURG, MT 59858-0411
PO BOX 412, PHILIPSBURG, MT 59858-0412
PO BOX 413, PHILIPSBURG, MT 59858-0413
PO BOX 414, PHILIPSBURG, MT 59858-0414
PO BOX 415, PHILIPSBURG, MT 59858-0415
PO BOX 416, PHILIPSBURG, MT 59858-0416
PO BOX 417, PHILIPSBURG, MT 59858-0417
PO BOX 418, PHILIPSBURG, MT 59858-0418
PO BOX 419, PHILIPSBURG, MT 59858-0419
PO BOX 420, PHILIPSBURG, MT 59858-0420
PO BOX 421, PHILIPSBURG, MT 59858-0421
PO BOX 422, PHILIPSBURG, MT 59858-0422
PO BOX 423, PHILIPSBURG, MT 59858-0423
PO BOX 424, PHILIPSBURG, MT 59858-0424
PO BOX 425, PHILIPSBURG, MT 59858-0425
PO BOX 426, PHILIPSBURG, MT 59858-0426
PO BOX 427, PHILIPSBURG, MT 59858-0427
PO BOX 428, PHILIPSBURG, MT 59858-0428
PO BOX 429, PHILIPSBURG, MT 59858-0429
PO BOX 430, PHILIPSBURG, MT 59858-0430
PO BOX 431, PHILIPSBURG, MT 59858-0431
PO BOX 432, PHILIPSBURG, MT 59858-0432
PO BOX 433, PHILIPSBURG, MT 59858-0433
PO BOX 434, PHILIPSBURG, MT 59858-0434
PO BOX 435, PHILIPSBURG, MT 59858-0435
PO BOX 436, PHILIPSBURG, MT 59858-0436
PO BOX 437, PHILIPSBURG, MT 59858-0437
PO BOX 438, PHILIPSBURG, MT 59858-0438
PO BOX 439, PHILIPSBURG, MT 59858-0439
PO BOX 440, PHILIPSBURG, MT 59858-0440
PO BOX 441, PHILIPSBURG, MT 59858-0441
PO BOX 442, PHILIPSBURG, MT 59858-0442
PO BOX 443, PHILIPSBURG, MT 59858-0443
PO BOX 444, PHILIPSBURG, MT 59858-0444
PO BOX 445, PHILIPSBURG, MT 59858-0445
PO BOX 446, PHILIPSBURG, MT 59858-0446
PO BOX 447, PHILIPSBURG, MT 59858-0447
PO BOX 448, PHILIPSBURG, MT 59858-0448
PO BOX 449, PHILIPSBURG, MT 59858-0449
PO BOX 450, PHILIPSBURG, MT 59858-0450
PO BOX 451, PHILIPSBURG, MT 59858-0451
PO BOX 452, PHILIPSBURG, MT 59858-0452
PO BOX 453, PHILIPSBURG, MT 59858-0453
PO BOX 454, PHILIPSBURG, MT 59858-0454
PO BOX 455, PHILIPSBURG, MT 59858-0455
PO BOX 456, PHILIPSBURG, MT 59858-0456
PO BOX 457, PHILIPSBURG, MT 59858-0457
PO BOX 458, PHILIPSBURG, MT 59858-0458
PO BOX 459, PHILIPSBURG, MT 59858-0459
PO BOX 460, PHILIPSBURG, MT 59858-0460
PO BOX 461, PHILIPSBURG, MT 59858-0461
PO BOX 462, PHILIPSBURG, MT 59858-0462
PO BOX 463, PHILIPSBURG, MT 59858-0463
PO BOX 464, PHILIPSBURG, MT 59858-0464
PO BOX 465, PHILIPSBURG, MT 59858-0465
PO BOX 466, PHILIPSBURG, MT 59858-0466
PO BOX 467, PHILIPSBURG, MT 59858-0467
PO BOX 468, PHILIPSBURG, MT 59858-0468
PO BOX 469, PHILIPSBURG, MT 59858-0469
PO BOX 470, PHILIPSBURG, MT 59858-0470
PO BOX 471, PHILIPSBURG, MT 59858-0471
PO BOX 472, PHILIPSBURG, MT 59858-0472
PO BOX 473, PHILIPSBURG, MT 59858-0473
PO BOX 474, PHILIPSBURG, MT 59858-0474
PO BOX 475, PHILIPSBURG, MT 59858-0475
PO BOX 476, PHILIPSBURG, MT 59858-0476
PO BOX 477, PHILIPSBURG, MT 59858-0477
PO BOX 478, PHILIPSBURG, MT 59858-0478
PO BOX 479, PHILIPSBURG, MT 59858-0479
PO BOX 480, PHILIPSBURG, MT 59858-0480
PO BOX 481, PHILIPSBURG, MT 59858-0481
PO BOX 482, PHILIPSBURG, MT 59858-0482
PO BOX 483, PHILIPSBURG, MT 59858-0483
PO BOX 484, PHILIPSBURG, MT 59858-0484
PO BOX 485, PHILIPSBURG, MT 59858-0485
PO BOX 486, PHILIPSBURG, MT 59858-0486
PO BOX 487, PHILIPSBURG, MT 59858-0487
PO BOX 488, PHILIPSBURG, MT 59858-0488
PO BOX 489, PHILIPSBURG, MT 59858-0489
PO BOX 490, PHILIPSBURG, MT 59858-0490
PO BOX 491, PHILIPSBURG, MT 59858-0491
PO BOX 492, PHILIPSBURG, MT 59858-0492
PO BOX 493, PHILIPSBURG, MT 59858-0493
PO BOX 494, PHILIPSBURG, MT 59858-0494
PO BOX 495, PHILIPSBURG, MT 59858-0495
PO BOX 496, PHILIPSBURG, MT 59858-0496
PO BOX 497, PHILIPSBURG, MT 59858-0497
PO BOX 498, PHILIPSBURG, MT 59858-0498
PO BOX 499, PHILIPSBURG, MT 59858-0499
PO BOX 500, PHILIPSBURG, MT 59858-0500
PO BOX 501, PHILIPSBURG, MT 59858-0501
PO BOX 502, PHILIPSBURG, MT 59858-0502
PO BOX 503, PHILIPSBURG, MT 59858-0503
PO BOX 504, PHILIPSBURG, MT 59858-0504
PO BOX 505, PHILIPSBURG, MT 59858-0505
PO BOX 506, PHILIPSBURG, MT 59858-0506
PO BOX 507, PHILIPSBURG, MT 59858-0507
PO BOX 508, PHILIPSBURG, MT 59858-0508
PO BOX 509, PHILIPSBURG, MT 59858-0509
PO BOX 510, PHILIPSBURG, MT 59858-0510
PO BOX 511, PHILIPSBURG, MT 59858-0511
PO BOX 512, PHILIPSBURG, MT 59858-0512
PO BOX 513, PHILIPSBURG, MT 59858-0513
PO BOX 514, PHILIPSBURG, MT 59858-0514
PO BOX 515, PHILIPSBURG, MT 59858-0515
PO BOX 516, PHILIPSBURG, MT 59858-0516
PO BOX 517, PHILIPSBURG, MT 59858-0517
PO BOX 518, PHILIPSBURG, MT 59858-0518
PO BOX 519, PHILIPSBURG, MT 59858-0519
PO BOX 520, PHILIPSBURG, MT 59858-0520
PO BOX 521, PHILIPSBURG, MT 59858-0521
PO BOX 522, PHILIPSBURG, MT 59858-0522
PO BOX 523, PHILIPSBURG, MT 59858-0523
PO BOX 524, PHILIPSBURG, MT 59858-0524
PO BOX 525, PHILIPSBURG, MT 59858-0525
PO BOX 526, PHILIPSBURG, MT 59858-0526
PO BOX 527, PHILIPSBURG, MT 59858-0527
PO BOX 528, PHILIPSBURG, MT 59858-0528
PO BOX 529, PHILIPSBURG, MT 59858-0529
PO BOX 530, PHILIPSBURG, MT 59858-0530
PO BOX 531, PHILIPSBURG, MT 59858-0531
PO BOX 532, PHILIPSBURG, MT 59858-0532
PO BOX 533, PHILIPSBURG, MT 59858-0533
PO BOX 534, PHILIPSBURG, MT 59858-0534
PO BOX 535, PHILIPSBURG, MT 59858-0535
PO BOX 536, PHILIPSBURG, MT 59858-0536
PO BOX 537, PHILIPSBURG, MT 59858-0537
PO BOX 538, PHILIPSBURG, MT 59858-0538
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