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 451, BISMARCK, ND 58502-0451
PO BOX 452, BISMARCK, ND 58502-0452
PO BOX 453, BISMARCK, ND 58502-0453
PO BOX 454, BISMARCK, ND 58502-0454
PO BOX 455, BISMARCK, ND 58502-0455
PO BOX 456, BISMARCK, ND 58502-0456
PO BOX 457, BISMARCK, ND 58502-0457
PO BOX 458, BISMARCK, ND 58502-0458
PO BOX 459, BISMARCK, ND 58502-0459
PO BOX 460, BISMARCK, ND 58502-0460
PO BOX 461, BISMARCK, ND 58502-0461
PO BOX 462, BISMARCK, ND 58502-0462
PO BOX 463, BISMARCK, ND 58502-0463
PO BOX 464, BISMARCK, ND 58502-0464
PO BOX 465, BISMARCK, ND 58502-0465
PO BOX 466, BISMARCK, ND 58502-0466
PO BOX 467, BISMARCK, ND 58502-0467
PO BOX 468, BISMARCK, ND 58502-0468
PO BOX 469, BISMARCK, ND 58502-0469
PO BOX 470, BISMARCK, ND 58502-0470
PO BOX 471, BISMARCK, ND 58502-0471
PO BOX 472, BISMARCK, ND 58502-0472
PO BOX 473, BISMARCK, ND 58502-0473
PO BOX 474, BISMARCK, ND 58502-0474
PO BOX 475, BISMARCK, ND 58502-0475
PO BOX 476, BISMARCK, ND 58502-0476
PO BOX 477, BISMARCK, ND 58502-0477
PO BOX 478, BISMARCK, ND 58502-0478
PO BOX 479, BISMARCK, ND 58502-0479
PO BOX 480, BISMARCK, ND 58502-0480
PO BOX 481, BISMARCK, ND 58502-0481
PO BOX 482, BISMARCK, ND 58502-0482
PO BOX 483, BISMARCK, ND 58502-0483
PO BOX 484, BISMARCK, ND 58502-0484
PO BOX 485, BISMARCK, ND 58502-0485
PO BOX 486, BISMARCK, ND 58502-0486
PO BOX 487, BISMARCK, ND 58502-0487
PO BOX 488, BISMARCK, ND 58502-0488
PO BOX 489, BISMARCK, ND 58502-0489
PO BOX 490, BISMARCK, ND 58502-0490
PO BOX 491, BISMARCK, ND 58502-0491
PO BOX 492, BISMARCK, ND 58502-0492
PO BOX 493, BISMARCK, ND 58502-0493
PO BOX 494, BISMARCK, ND 58502-0494
PO BOX 495, BISMARCK, ND 58502-0495
PO BOX 496, BISMARCK, ND 58502-0496
PO BOX 497, BISMARCK, ND 58502-0497
PO BOX 498, BISMARCK, ND 58502-0498
PO BOX 499, BISMARCK, ND 58502-0499
PO BOX 500, BISMARCK, ND 58502-0500
PO BOX 501, BISMARCK, ND 58502-0501
PO BOX 502, BISMARCK, ND 58502-0502
PO BOX 503, BISMARCK, ND 58502-0503
PO BOX 504, BISMARCK, ND 58502-0504
PO BOX 505, BISMARCK, ND 58502-0505
PO BOX 506, BISMARCK, ND 58502-0506
PO BOX 507, BISMARCK, ND 58502-0507
PO BOX 508, BISMARCK, ND 58502-0508
PO BOX 509, BISMARCK, ND 58502-0509
PO BOX 510, BISMARCK, ND 58502-0510
PO BOX 511, BISMARCK, ND 58502-0511
PO BOX 512, BISMARCK, ND 58502-0512
PO BOX 513, BISMARCK, ND 58502-0513
PO BOX 514, BISMARCK, ND 58502-0514
PO BOX 515, BISMARCK, ND 58502-0515
PO BOX 516, BISMARCK, ND 58502-0516
PO BOX 517, BISMARCK, ND 58502-0517
PO BOX 518, BISMARCK, ND 58502-0518
PO BOX 519, BISMARCK, ND 58502-0519
PO BOX 520, BISMARCK, ND 58502-0520
PO BOX 521, BISMARCK, ND 58502-0521
PO BOX 522, BISMARCK, ND 58502-0522
PO BOX 523, BISMARCK, ND 58502-0523
PO BOX 524, BISMARCK, ND 58502-0524
PO BOX 525, BISMARCK, ND 58502-0525
PO BOX 526, BISMARCK, ND 58502-0526
PO BOX 527, BISMARCK, ND 58502-0527
PO BOX 528, BISMARCK, ND 58502-0528
PO BOX 529, BISMARCK, ND 58502-0529
PO BOX 530, BISMARCK, ND 58502-0530
PO BOX 531, BISMARCK, ND 58502-0531
PO BOX 532, BISMARCK, ND 58502-0532
PO BOX 533, BISMARCK, ND 58502-0533
PO BOX 534, BISMARCK, ND 58502-0534
PO BOX 535, BISMARCK, ND 58502-0535
PO BOX 536, BISMARCK, ND 58502-0536
PO BOX 537, BISMARCK, ND 58502-0537
PO BOX 538, BISMARCK, ND 58502-0538
PO BOX 539, BISMARCK, ND 58502-0539
PO BOX 540, BISMARCK, ND 58502-0540
PO BOX 541, BISMARCK, ND 58502-0541
PO BOX 542, BISMARCK, ND 58502-0542
PO BOX 543, BISMARCK, ND 58502-0543
PO BOX 544, BISMARCK, ND 58502-0544
PO BOX 545, BISMARCK, ND 58502-0545
PO BOX 546, BISMARCK, ND 58502-0546
PO BOX 547, BISMARCK, ND 58502-0547
PO BOX 548, BISMARCK, ND 58502-0548
PO BOX 549, BISMARCK, ND 58502-0549
PO BOX 550, BISMARCK, ND 58502-0550
PO BOX 551, BISMARCK, ND 58502-0551
PO BOX 552, BISMARCK, ND 58502-0552
PO BOX 553, BISMARCK, ND 58502-0553
PO BOX 554, BISMARCK, ND 58502-0554
PO BOX 555, BISMARCK, ND 58502-0555
PO BOX 556, BISMARCK, ND 58502-0556
PO BOX 557, BISMARCK, ND 58502-0557
PO BOX 558, BISMARCK, ND 58502-0558
PO BOX 559, BISMARCK, ND 58502-0559
PO BOX 560, BISMARCK, ND 58502-0560
PO BOX 561, BISMARCK, ND 58502-0561
PO BOX 562, BISMARCK, ND 58502-0562
PO BOX 563, BISMARCK, ND 58502-0563
PO BOX 564, BISMARCK, ND 58502-0564
PO BOX 565, BISMARCK, ND 58502-0565
PO BOX 566, BISMARCK, ND 58502-0566
PO BOX 567, BISMARCK, ND 58502-0567
PO BOX 568, BISMARCK, ND 58502-0568
PO BOX 569, BISMARCK, ND 58502-0569
PO BOX 570, BISMARCK, ND 58502-0570
PO BOX 571, BISMARCK, ND 58502-0571
PO BOX 572, BISMARCK, ND 58502-0572
PO BOX 573, BISMARCK, ND 58502-0573
PO BOX 574, BISMARCK, ND 58502-0574
PO BOX 575, BISMARCK, ND 58502-0575
PO BOX 576, BISMARCK, ND 58502-0576
PO BOX 577, BISMARCK, ND 58502-0577
PO BOX 578, BISMARCK, ND 58502-0578
PO BOX 579, BISMARCK, ND 58502-0579
PO BOX 580, BISMARCK, ND 58502-0580
PO BOX 581, BISMARCK, ND 58502-0581
PO BOX 582, BISMARCK, ND 58502-0582
PO BOX 583, BISMARCK, ND 58502-0583
PO BOX 584, BISMARCK, ND 58502-0584
PO BOX 585, BISMARCK, ND 58502-0585
PO BOX 586, BISMARCK, ND 58502-0586
PO BOX 587, BISMARCK, ND 58502-0587
PO BOX 588, BISMARCK, ND 58502-0588
PO BOX 589, BISMARCK, ND 58502-0589
PO BOX 590, BISMARCK, ND 58502-0590
PO BOX 591, BISMARCK, ND 58502-0591
PO BOX 592, BISMARCK, ND 58502-0592
PO BOX 593, BISMARCK, ND 58502-0593
PO BOX 594, BISMARCK, ND 58502-0594
PO BOX 595, BISMARCK, ND 58502-0595
PO BOX 596, BISMARCK, ND 58502-0596
PO BOX 597, BISMARCK, ND 58502-0597
PO BOX 598, BISMARCK, ND 58502-0598
PO BOX 599, BISMARCK, ND 58502-0599
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