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 421, SHEFFIELD, IA 50475-0421
PO BOX 422, SHEFFIELD, IA 50475-0422
PO BOX 423, SHEFFIELD, IA 50475-0423
PO BOX 424, SHEFFIELD, IA 50475-0424
PO BOX 425, SHEFFIELD, IA 50475-0425
PO BOX 426, SHEFFIELD, IA 50475-0426
PO BOX 427, SHEFFIELD, IA 50475-0427
PO BOX 428, SHEFFIELD, IA 50475-0428
PO BOX 429, SHEFFIELD, IA 50475-0429
PO BOX 430, SHEFFIELD, IA 50475-0430
PO BOX 431, SHEFFIELD, IA 50475-0431
PO BOX 432, SHEFFIELD, IA 50475-0432
PO BOX 433, SHEFFIELD, IA 50475-0433
PO BOX 434, SHEFFIELD, IA 50475-0434
PO BOX 435, SHEFFIELD, IA 50475-0435
PO BOX 436, SHEFFIELD, IA 50475-0436
PO BOX 437, SHEFFIELD, IA 50475-0437
PO BOX 438, SHEFFIELD, IA 50475-0438
PO BOX 439, SHEFFIELD, IA 50475-0439
PO BOX 440, SHEFFIELD, IA 50475-0440
PO BOX 441, SHEFFIELD, IA 50475-0441
PO BOX 442, SHEFFIELD, IA 50475-0442
PO BOX 443, SHEFFIELD, IA 50475-0443
PO BOX 444, SHEFFIELD, IA 50475-0444
PO BOX 445, SHEFFIELD, IA 50475-0445
PO BOX 446, SHEFFIELD, IA 50475-0446
PO BOX 447, SHEFFIELD, IA 50475-0447
PO BOX 448, SHEFFIELD, IA 50475-0448
PO BOX 449, SHEFFIELD, IA 50475-0449
PO BOX 450, SHEFFIELD, IA 50475-0450
PO BOX 451, SHEFFIELD, IA 50475-0451
PO BOX 452, SHEFFIELD, IA 50475-0452
PO BOX 453, SHEFFIELD, IA 50475-0453
PO BOX 454, SHEFFIELD, IA 50475-0454
PO BOX 455, SHEFFIELD, IA 50475-0455
PO BOX 456, SHEFFIELD, IA 50475-0456
PO BOX 457, SHEFFIELD, IA 50475-0457
PO BOX 458, SHEFFIELD, IA 50475-0458
PO BOX 459, SHEFFIELD, IA 50475-0459
PO BOX 460, SHEFFIELD, IA 50475-0460
PO BOX 461, SHEFFIELD, IA 50475-0461
PO BOX 462, SHEFFIELD, IA 50475-0462
PO BOX 463, SHEFFIELD, IA 50475-0463
PO BOX 464, SHEFFIELD, IA 50475-0464
PO BOX 465, SHEFFIELD, IA 50475-0465
PO BOX 466, SHEFFIELD, IA 50475-0466
PO BOX 467, SHEFFIELD, IA 50475-0467
PO BOX 468, SHEFFIELD, IA 50475-0468
PO BOX 469, SHEFFIELD, IA 50475-0469
PO BOX 470, SHEFFIELD, IA 50475-0470
PO BOX 471, SHEFFIELD, IA 50475-0471
PO BOX 472, SHEFFIELD, IA 50475-0472
PO BOX 473, SHEFFIELD, IA 50475-0473
PO BOX 474, SHEFFIELD, IA 50475-0474
PO BOX 475, SHEFFIELD, IA 50475-0475
PO BOX 476, SHEFFIELD, IA 50475-0476
PO BOX 477, SHEFFIELD, IA 50475-0477
PO BOX 478, SHEFFIELD, IA 50475-0478
PO BOX 479, SHEFFIELD, IA 50475-0479
PO BOX 480, SHEFFIELD, IA 50475-0480
PO BOX 481, SHEFFIELD, IA 50475-0481
PO BOX 482, SHEFFIELD, IA 50475-0482
PO BOX 483, SHEFFIELD, IA 50475-0483
PO BOX 484, SHEFFIELD, IA 50475-0484
PO BOX 485, SHEFFIELD, IA 50475-0485
PO BOX 486, SHEFFIELD, IA 50475-0486
PO BOX 487, SHEFFIELD, IA 50475-0487
PO BOX 488, SHEFFIELD, IA 50475-0488
PO BOX 489, SHEFFIELD, IA 50475-0489
PO BOX 490, SHEFFIELD, IA 50475-0490
PO BOX 491, SHEFFIELD, IA 50475-0491
PO BOX 492, SHEFFIELD, IA 50475-0492
PO BOX 493, SHEFFIELD, IA 50475-0493
PO BOX 494, SHEFFIELD, IA 50475-0494
PO BOX 495, SHEFFIELD, IA 50475-0495
PO BOX 496, SHEFFIELD, IA 50475-0496
PO BOX 497, SHEFFIELD, IA 50475-0497
PO BOX 498, SHEFFIELD, IA 50475-0498
PO BOX 499, SHEFFIELD, IA 50475-0499
PO BOX 500, SHEFFIELD, IA 50475-0500
PO BOX 501, SHEFFIELD, IA 50475-0501
PO BOX 502, SHEFFIELD, IA 50475-0502
PO BOX 503, SHEFFIELD, IA 50475-0503
PO BOX 504, SHEFFIELD, IA 50475-0504
PO BOX 505, SHEFFIELD, IA 50475-0505
PO BOX 506, SHEFFIELD, IA 50475-0506
PO BOX 507, SHEFFIELD, IA 50475-0507
PO BOX 508, SHEFFIELD, IA 50475-0508
PO BOX 509, SHEFFIELD, IA 50475-0509
PO BOX 510, SHEFFIELD, IA 50475-0510
PO BOX 511, SHEFFIELD, IA 50475-0511
PO BOX 512, SHEFFIELD, IA 50475-0512
PO BOX 513, SHEFFIELD, IA 50475-0513
PO BOX 514, SHEFFIELD, IA 50475-0514
PO BOX 515, SHEFFIELD, IA 50475-0515
PO BOX 516, SHEFFIELD, IA 50475-0516
PO BOX 517, SHEFFIELD, IA 50475-0517
PO BOX 518, SHEFFIELD, IA 50475-0518
PO BOX 519, SHEFFIELD, IA 50475-0519
PO BOX 520, SHEFFIELD, IA 50475-0520
PO BOX 521, SHEFFIELD, IA 50475-0521
PO BOX 522, SHEFFIELD, IA 50475-0522
PO BOX 523, SHEFFIELD, IA 50475-0523
PO BOX 524, SHEFFIELD, IA 50475-0524
PO BOX 525, SHEFFIELD, IA 50475-0525
PO BOX 526, SHEFFIELD, IA 50475-0526
PO BOX 527, SHEFFIELD, IA 50475-0527
PO BOX 528, SHEFFIELD, IA 50475-0528
PO BOX 529, SHEFFIELD, IA 50475-0529
PO BOX 530, SHEFFIELD, IA 50475-0530
PO BOX 531, SHEFFIELD, IA 50475-0531
PO BOX 532, SHEFFIELD, IA 50475-0532
PO BOX 533, SHEFFIELD, IA 50475-0533
PO BOX 534, SHEFFIELD, IA 50475-0534
PO BOX 535, SHEFFIELD, IA 50475-0535
PO BOX 536, SHEFFIELD, IA 50475-0536
PO BOX 537, SHEFFIELD, IA 50475-0537
PO BOX 538, SHEFFIELD, IA 50475-0538
PO BOX 539, SHEFFIELD, IA 50475-0539
PO BOX 540, SHEFFIELD, IA 50475-0540
PO BOX 541, SHEFFIELD, IA 50475-0541
PO BOX 542, SHEFFIELD, IA 50475-0542
PO BOX 543, SHEFFIELD, IA 50475-0543
PO BOX 544, SHEFFIELD, IA 50475-0544
PO BOX 545, SHEFFIELD, IA 50475-0545
PO BOX 546, SHEFFIELD, IA 50475-0546
PO BOX 547, SHEFFIELD, IA 50475-0547
PO BOX 548, SHEFFIELD, IA 50475-0548
PO BOX 549, SHEFFIELD, IA 50475-0549
PO BOX 550, SHEFFIELD, IA 50475-0550
PO BOX 551, SHEFFIELD, IA 50475-0551
PO BOX 552, SHEFFIELD, IA 50475-0552
PO BOX 553, SHEFFIELD, IA 50475-0553
PO BOX 554, SHEFFIELD, IA 50475-0554
PO BOX 555, SHEFFIELD, IA 50475-0555
PO BOX 556, SHEFFIELD, IA 50475-0556
PO BOX 557, SHEFFIELD, IA 50475-0557
PO BOX 558, SHEFFIELD, IA 50475-0558
PO BOX 559, SHEFFIELD, IA 50475-0559
PO BOX 560, SHEFFIELD, IA 50475-0560
PO BOX 561, SHEFFIELD, IA 50475-0561
PO BOX 562, SHEFFIELD, IA 50475-0562
PO BOX 563, SHEFFIELD, IA 50475-0563
PO BOX 564, SHEFFIELD, IA 50475-0564
PO BOX 565, SHEFFIELD, IA 50475-0565
PO BOX 566, SHEFFIELD, IA 50475-0566
PO BOX 567, SHEFFIELD, IA 50475-0567
PO BOX 568, SHEFFIELD, IA 50475-0568
PO BOX 569, SHEFFIELD, IA 50475-0569
PO BOX 570, SHEFFIELD, IA 50475-0570
PO BOX 571, SHEFFIELD, IA 50475-0571
PO BOX 572, SHEFFIELD, IA 50475-0572
PO BOX 573, SHEFFIELD, IA 50475-0573
PO BOX 574, SHEFFIELD, IA 50475-0574
PO BOX 575, SHEFFIELD, IA 50475-0575
PO BOX 576, SHEFFIELD, IA 50475-0576
PO BOX 577, SHEFFIELD, IA 50475-0577
PO BOX 578, SHEFFIELD, IA 50475-0578
PO BOX 579, SHEFFIELD, IA 50475-0579
PO BOX 580, SHEFFIELD, IA 50475-0580
PO BOX 581, SHEFFIELD, IA 50475-0581
PO BOX 582, SHEFFIELD, IA 50475-0582
PO BOX 583, SHEFFIELD, IA 50475-0583
PO BOX 584, SHEFFIELD, IA 50475-0584
PO BOX 585, SHEFFIELD, IA 50475-0585
PO BOX 586, SHEFFIELD, IA 50475-0586
PO BOX 587, SHEFFIELD, IA 50475-0587
PO BOX 588, SHEFFIELD, IA 50475-0588
PO BOX 589, SHEFFIELD, IA 50475-0589
PO BOX 590, SHEFFIELD, IA 50475-0590
PO BOX 591, SHEFFIELD, IA 50475-0591
PO BOX 592, SHEFFIELD, IA 50475-0592
PO BOX 593, SHEFFIELD, IA 50475-0593
PO BOX 594, SHEFFIELD, IA 50475-0594
PO BOX 595, SHEFFIELD, IA 50475-0595
PO BOX 596, SHEFFIELD, IA 50475-0596
PO BOX 597, SHEFFIELD, IA 50475-0597
PO BOX 598, SHEFFIELD, IA 50475-0598
PO BOX 599, SHEFFIELD, IA 50475-0599
PO BOX 600, SHEFFIELD, IA 50475-0600
PO BOX 601, SHEFFIELD, IA 50475-0601
PO BOX 602, SHEFFIELD, IA 50475-0602
PO BOX 603, SHEFFIELD, IA 50475-0603
PO BOX 604, SHEFFIELD, IA 50475-0604
PO BOX 605, SHEFFIELD, IA 50475-0605
PO BOX 606, SHEFFIELD, IA 50475-0606
PO BOX 607, SHEFFIELD, IA 50475-0607
PO BOX 608, SHEFFIELD, IA 50475-0608
PO BOX 609, SHEFFIELD, IA 50475-0609
PO BOX 610, SHEFFIELD, IA 50475-0610
PO BOX 611, SHEFFIELD, IA 50475-0611
PO BOX 612, SHEFFIELD, IA 50475-0612
PO BOX 613, SHEFFIELD, IA 50475-0613
PO BOX 614, SHEFFIELD, IA 50475-0614
PO BOX 615, SHEFFIELD, IA 50475-0615
PO BOX 616, SHEFFIELD, IA 50475-0616
PO BOX 617, SHEFFIELD, IA 50475-0617
PO BOX 618, SHEFFIELD, IA 50475-0618
PO BOX 619, SHEFFIELD, IA 50475-0619
PO BOX 620, SHEFFIELD, IA 50475-0620
PO BOX 621, SHEFFIELD, IA 50475-0621
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