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, DECORAH, IA 52101-0401
PO BOX 402, DECORAH, IA 52101-0402
PO BOX 403, DECORAH, IA 52101-0403
PO BOX 404, DECORAH, IA 52101-0404
PO BOX 405, DECORAH, IA 52101-0405
PO BOX 406, DECORAH, IA 52101-0406
PO BOX 407, DECORAH, IA 52101-0407
PO BOX 408, DECORAH, IA 52101-0408
PO BOX 409, DECORAH, IA 52101-0409
PO BOX 410, DECORAH, IA 52101-0410
PO BOX 411, DECORAH, IA 52101-0411
PO BOX 412, DECORAH, IA 52101-0412
PO BOX 413, DECORAH, IA 52101-0413
PO BOX 414, DECORAH, IA 52101-0414
PO BOX 415, DECORAH, IA 52101-0415
PO BOX 416, DECORAH, IA 52101-0416
PO BOX 417, DECORAH, IA 52101-0417
PO BOX 418, DECORAH, IA 52101-0418
PO BOX 419, DECORAH, IA 52101-0419
PO BOX 420, DECORAH, IA 52101-0420
PO BOX 421, DECORAH, IA 52101-0421
PO BOX 422, DECORAH, IA 52101-0422
PO BOX 423, DECORAH, IA 52101-0423
PO BOX 424, DECORAH, IA 52101-0424
PO BOX 425, DECORAH, IA 52101-0425
PO BOX 426, DECORAH, IA 52101-0426
PO BOX 427, DECORAH, IA 52101-0427
PO BOX 428, DECORAH, IA 52101-0428
PO BOX 429, DECORAH, IA 52101-0429
PO BOX 430, DECORAH, IA 52101-0430
PO BOX 431, DECORAH, IA 52101-0431
PO BOX 432, DECORAH, IA 52101-0432
PO BOX 433, DECORAH, IA 52101-0433
PO BOX 434, DECORAH, IA 52101-0434
PO BOX 435, DECORAH, IA 52101-0435
PO BOX 436, DECORAH, IA 52101-0436
PO BOX 437, DECORAH, IA 52101-0437
PO BOX 438, DECORAH, IA 52101-0438
PO BOX 439, DECORAH, IA 52101-0439
PO BOX 440, DECORAH, IA 52101-0440
PO BOX 441, DECORAH, IA 52101-0441
PO BOX 442, DECORAH, IA 52101-0442
PO BOX 443, DECORAH, IA 52101-0443
PO BOX 444, DECORAH, IA 52101-0444
PO BOX 445, DECORAH, IA 52101-0445
PO BOX 446, DECORAH, IA 52101-0446
PO BOX 447, DECORAH, IA 52101-0447
PO BOX 448, DECORAH, IA 52101-0448
PO BOX 449, DECORAH, IA 52101-0449
PO BOX 450, DECORAH, IA 52101-0450
PO BOX 451, DECORAH, IA 52101-0451
PO BOX 452, DECORAH, IA 52101-0452
PO BOX 453, DECORAH, IA 52101-0453
PO BOX 454, DECORAH, IA 52101-0454
PO BOX 455, DECORAH, IA 52101-0455
PO BOX 456, DECORAH, IA 52101-0456
PO BOX 457, DECORAH, IA 52101-0457
PO BOX 458, DECORAH, IA 52101-0458
PO BOX 459, DECORAH, IA 52101-0459
PO BOX 460, DECORAH, IA 52101-0460
PO BOX 461, DECORAH, IA 52101-0461
PO BOX 462, DECORAH, IA 52101-0462
PO BOX 463, DECORAH, IA 52101-0463
PO BOX 464, DECORAH, IA 52101-0464
PO BOX 465, DECORAH, IA 52101-0465
PO BOX 466, DECORAH, IA 52101-0466
PO BOX 467, DECORAH, IA 52101-0467
PO BOX 468, DECORAH, IA 52101-0468
PO BOX 469, DECORAH, IA 52101-0469
PO BOX 470, DECORAH, IA 52101-0470
PO BOX 471, DECORAH, IA 52101-0471
PO BOX 472, DECORAH, IA 52101-0472
PO BOX 473, DECORAH, IA 52101-0473
PO BOX 474, DECORAH, IA 52101-0474
PO BOX 475, DECORAH, IA 52101-0475
PO BOX 476, DECORAH, IA 52101-0476
PO BOX 477, DECORAH, IA 52101-0477
PO BOX 478, DECORAH, IA 52101-0478
PO BOX 479, DECORAH, IA 52101-0479
PO BOX 480, DECORAH, IA 52101-0480
PO BOX 481, DECORAH, IA 52101-0481
PO BOX 482, DECORAH, IA 52101-0482
PO BOX 483, DECORAH, IA 52101-0483
PO BOX 484, DECORAH, IA 52101-0484
PO BOX 485, DECORAH, IA 52101-0485
PO BOX 486, DECORAH, IA 52101-0486
PO BOX 487, DECORAH, IA 52101-0487
PO BOX 488, DECORAH, IA 52101-0488
PO BOX 489, DECORAH, IA 52101-0489
PO BOX 490, DECORAH, IA 52101-0490
PO BOX 491, DECORAH, IA 52101-0491
PO BOX 492, DECORAH, IA 52101-0492
PO BOX 493, DECORAH, IA 52101-0493
PO BOX 494, DECORAH, IA 52101-0494
PO BOX 495, DECORAH, IA 52101-0495
PO BOX 496, DECORAH, IA 52101-0496
PO BOX 497, DECORAH, IA 52101-0497
PO BOX 498, DECORAH, IA 52101-0498
PO BOX 499, DECORAH, IA 52101-0499
PO BOX 500, DECORAH, IA 52101-0500
PO BOX 501, DECORAH, IA 52101-0501
PO BOX 502, DECORAH, IA 52101-0502
PO BOX 503, DECORAH, IA 52101-0503
PO BOX 504, DECORAH, IA 52101-0504
PO BOX 505, DECORAH, IA 52101-0505
PO BOX 506, DECORAH, IA 52101-0506
PO BOX 507, DECORAH, IA 52101-0507
PO BOX 508, DECORAH, IA 52101-0508
PO BOX 509, DECORAH, IA 52101-0509
PO BOX 510, DECORAH, IA 52101-0510
PO BOX 511, DECORAH, IA 52101-0511
PO BOX 512, DECORAH, IA 52101-0512
PO BOX 513, DECORAH, IA 52101-0513
PO BOX 514, DECORAH, IA 52101-0514
PO BOX 515, DECORAH, IA 52101-0515
PO BOX 516, DECORAH, IA 52101-0516
PO BOX 517, DECORAH, IA 52101-0517
PO BOX 518, DECORAH, IA 52101-0518
PO BOX 519, DECORAH, IA 52101-0519
PO BOX 520, DECORAH, IA 52101-0520
PO BOX 521, DECORAH, IA 52101-0521
PO BOX 522, DECORAH, IA 52101-0522
PO BOX 523, DECORAH, IA 52101-0523
PO BOX 524, DECORAH, IA 52101-0524
PO BOX 525, DECORAH, IA 52101-0525
PO BOX 526, DECORAH, IA 52101-0526
PO BOX 527, DECORAH, IA 52101-0527
PO BOX 528, DECORAH, IA 52101-0528
PO BOX 529, DECORAH, IA 52101-0529
PO BOX 530, DECORAH, IA 52101-0530
PO BOX 531, DECORAH, IA 52101-0531
PO BOX 532, DECORAH, IA 52101-0532
PO BOX 533, DECORAH, IA 52101-0533
PO BOX 534, DECORAH, IA 52101-0534
PO BOX 535, DECORAH, IA 52101-0535
PO BOX 536, DECORAH, IA 52101-0536
PO BOX 537, DECORAH, IA 52101-0537
PO BOX 538, DECORAH, IA 52101-0538
PO BOX 539, DECORAH, IA 52101-0539
PO BOX 540, DECORAH, IA 52101-0540
PO BOX 541, DECORAH, IA 52101-0541
PO BOX 542, DECORAH, IA 52101-0542
PO BOX 543, DECORAH, IA 52101-0543
PO BOX 544, DECORAH, IA 52101-0544
PO BOX 545, DECORAH, IA 52101-0545
PO BOX 546, DECORAH, IA 52101-0546
PO BOX 547, DECORAH, IA 52101-0547
PO BOX 548, DECORAH, IA 52101-0548
PO BOX 549, DECORAH, IA 52101-0549
PO BOX 550, DECORAH, IA 52101-0550
PO BOX 551, DECORAH, IA 52101-0551
PO BOX 552, DECORAH, IA 52101-0552
PO BOX 553, DECORAH, IA 52101-0553
PO BOX 554, DECORAH, IA 52101-0554
PO BOX 555, DECORAH, IA 52101-0555
PO BOX 556, DECORAH, IA 52101-0556
PO BOX 557, DECORAH, IA 52101-0557
PO BOX 558, DECORAH, IA 52101-0558
PO BOX 559, DECORAH, IA 52101-0559
PO BOX 560, DECORAH, IA 52101-0560
PO BOX 561, DECORAH, IA 52101-0561
PO BOX 562, DECORAH, IA 52101-0562
PO BOX 563, DECORAH, IA 52101-0563
PO BOX 564, DECORAH, IA 52101-0564
PO BOX 565, DECORAH, IA 52101-0565
PO BOX 566, DECORAH, IA 52101-0566
PO BOX 567, DECORAH, IA 52101-0567
PO BOX 568, DECORAH, IA 52101-0568
PO BOX 569, DECORAH, IA 52101-0569
PO BOX 570, DECORAH, IA 52101-0570
PO BOX 571, DECORAH, IA 52101-0571
PO BOX 572, DECORAH, IA 52101-0572
PO BOX 573, DECORAH, IA 52101-0573
PO BOX 574, DECORAH, IA 52101-0574
PO BOX 575, DECORAH, IA 52101-0575
PO BOX 576, DECORAH, IA 52101-0576
PO BOX 577, DECORAH, IA 52101-0577
PO BOX 578, DECORAH, IA 52101-0578
PO BOX 579, DECORAH, IA 52101-0579
PO BOX 580, DECORAH, IA 52101-0580
PO BOX 581, DECORAH, IA 52101-0581
PO BOX 582, DECORAH, IA 52101-0582
PO BOX 583, DECORAH, IA 52101-0583
PO BOX 584, DECORAH, IA 52101-0584
PO BOX 585, DECORAH, IA 52101-0585
PO BOX 586, DECORAH, IA 52101-0586
PO BOX 587, DECORAH, IA 52101-0587
PO BOX 588, DECORAH, IA 52101-0588
PO BOX 589, DECORAH, IA 52101-0589
PO BOX 590, DECORAH, IA 52101-0590
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