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 501, HUMBOLDT, IA 50548-0501
PO BOX 502, HUMBOLDT, IA 50548-0502
PO BOX 503, HUMBOLDT, IA 50548-0503
PO BOX 504, HUMBOLDT, IA 50548-0504
PO BOX 505, HUMBOLDT, IA 50548-0505
PO BOX 506, HUMBOLDT, IA 50548-0506
PO BOX 507, HUMBOLDT, IA 50548-0507
PO BOX 508, HUMBOLDT, IA 50548-0508
PO BOX 509, HUMBOLDT, IA 50548-0509
PO BOX 510, HUMBOLDT, IA 50548-0510
PO BOX 511, HUMBOLDT, IA 50548-0511
PO BOX 512, HUMBOLDT, IA 50548-0512
PO BOX 513, HUMBOLDT, IA 50548-0513
PO BOX 514, HUMBOLDT, IA 50548-0514
PO BOX 515, HUMBOLDT, IA 50548-0515
PO BOX 516, HUMBOLDT, IA 50548-0516
PO BOX 517, HUMBOLDT, IA 50548-0517
PO BOX 518, HUMBOLDT, IA 50548-0518
PO BOX 519, HUMBOLDT, IA 50548-0519
PO BOX 520, HUMBOLDT, IA 50548-0520
PO BOX 521, HUMBOLDT, IA 50548-0521
PO BOX 522, HUMBOLDT, IA 50548-0522
PO BOX 523, HUMBOLDT, IA 50548-0523
PO BOX 524, HUMBOLDT, IA 50548-0524
PO BOX 525, HUMBOLDT, IA 50548-0525
PO BOX 526, HUMBOLDT, IA 50548-0526
PO BOX 527, HUMBOLDT, IA 50548-0527
PO BOX 528, HUMBOLDT, IA 50548-0528
PO BOX 529, HUMBOLDT, IA 50548-0529
PO BOX 530, HUMBOLDT, IA 50548-0530
PO BOX 531, HUMBOLDT, IA 50548-0531
PO BOX 532, HUMBOLDT, IA 50548-0532
PO BOX 533, HUMBOLDT, IA 50548-0533
PO BOX 534, HUMBOLDT, IA 50548-0534
PO BOX 535, HUMBOLDT, IA 50548-0535
PO BOX 536, HUMBOLDT, IA 50548-0536
PO BOX 537, HUMBOLDT, IA 50548-0537
PO BOX 538, HUMBOLDT, IA 50548-0538
PO BOX 539, HUMBOLDT, IA 50548-0539
PO BOX 540, HUMBOLDT, IA 50548-0540
PO BOX 541, HUMBOLDT, IA 50548-0541
PO BOX 542, HUMBOLDT, IA 50548-0542
PO BOX 543, HUMBOLDT, IA 50548-0543
PO BOX 544, HUMBOLDT, IA 50548-0544
PO BOX 545, HUMBOLDT, IA 50548-0545
PO BOX 546, HUMBOLDT, IA 50548-0546
PO BOX 547, HUMBOLDT, IA 50548-0547
PO BOX 548, HUMBOLDT, IA 50548-0548
PO BOX 549, HUMBOLDT, IA 50548-0549
PO BOX 550, HUMBOLDT, IA 50548-0550
PO BOX 551, HUMBOLDT, IA 50548-0551
PO BOX 552, HUMBOLDT, IA 50548-0552
PO BOX 553, HUMBOLDT, IA 50548-0553
PO BOX 554, HUMBOLDT, IA 50548-0554
PO BOX 555, HUMBOLDT, IA 50548-0555
PO BOX 556, HUMBOLDT, IA 50548-0556
PO BOX 557, HUMBOLDT, IA 50548-0557
PO BOX 558, HUMBOLDT, IA 50548-0558
PO BOX 559, HUMBOLDT, IA 50548-0559
PO BOX 560, HUMBOLDT, IA 50548-0560
PO BOX 561, HUMBOLDT, IA 50548-0561
PO BOX 562, HUMBOLDT, IA 50548-0562
PO BOX 563, HUMBOLDT, IA 50548-0563
PO BOX 564, HUMBOLDT, IA 50548-0564
PO BOX 565, HUMBOLDT, IA 50548-0565
PO BOX 566, HUMBOLDT, IA 50548-0566
PO BOX 567, HUMBOLDT, IA 50548-0567
PO BOX 568, HUMBOLDT, IA 50548-0568
PO BOX 569, HUMBOLDT, IA 50548-0569
PO BOX 570, HUMBOLDT, IA 50548-0570
PO BOX 571, HUMBOLDT, IA 50548-0571
PO BOX 572, HUMBOLDT, IA 50548-0572
PO BOX 573, HUMBOLDT, IA 50548-0573
PO BOX 574, HUMBOLDT, IA 50548-0574
PO BOX 575, HUMBOLDT, IA 50548-0575
PO BOX 576, HUMBOLDT, IA 50548-0576
PO BOX 577, HUMBOLDT, IA 50548-0577
PO BOX 578, HUMBOLDT, IA 50548-0578
PO BOX 579, HUMBOLDT, IA 50548-0579
PO BOX 580, HUMBOLDT, IA 50548-0580
PO BOX 581, HUMBOLDT, IA 50548-0581
PO BOX 582, HUMBOLDT, IA 50548-0582
PO BOX 583, HUMBOLDT, IA 50548-0583
PO BOX 584, HUMBOLDT, IA 50548-0584
PO BOX 585, HUMBOLDT, IA 50548-0585
PO BOX 586, HUMBOLDT, IA 50548-0586
PO BOX 587, HUMBOLDT, IA 50548-0587
PO BOX 588, HUMBOLDT, IA 50548-0588
PO BOX 589, HUMBOLDT, IA 50548-0589
PO BOX 590, HUMBOLDT, IA 50548-0590
PO BOX 591, HUMBOLDT, IA 50548-0591
PO BOX 592, HUMBOLDT, IA 50548-0592
PO BOX 593, HUMBOLDT, IA 50548-0593
PO BOX 594, HUMBOLDT, IA 50548-0594
PO BOX 595, HUMBOLDT, IA 50548-0595
PO BOX 596, HUMBOLDT, IA 50548-0596
PO BOX 597, HUMBOLDT, IA 50548-0597
PO BOX 598, HUMBOLDT, IA 50548-0598
PO BOX 599, HUMBOLDT, IA 50548-0599
PO BOX 600, HUMBOLDT, IA 50548-0600
PO BOX 601, HUMBOLDT, IA 50548-0601
PO BOX 602, HUMBOLDT, IA 50548-0602
PO BOX 603, HUMBOLDT, IA 50548-0603
PO BOX 604, HUMBOLDT, IA 50548-0604
PO BOX 605, HUMBOLDT, IA 50548-0605
PO BOX 606, HUMBOLDT, IA 50548-0606
PO BOX 607, HUMBOLDT, IA 50548-0607
PO BOX 608, HUMBOLDT, IA 50548-0608
PO BOX 609, HUMBOLDT, IA 50548-0609
PO BOX 610, HUMBOLDT, IA 50548-0610
PO BOX 611, HUMBOLDT, IA 50548-0611
PO BOX 612, HUMBOLDT, IA 50548-0612
PO BOX 613, HUMBOLDT, IA 50548-0613
PO BOX 614, HUMBOLDT, IA 50548-0614
PO BOX 615, HUMBOLDT, IA 50548-0615
PO BOX 616, HUMBOLDT, IA 50548-0616
PO BOX 617, HUMBOLDT, IA 50548-0617
PO BOX 618, HUMBOLDT, IA 50548-0618
PO BOX 619, HUMBOLDT, IA 50548-0619
PO BOX 620, HUMBOLDT, IA 50548-0620
PO BOX 621, HUMBOLDT, IA 50548-0621
PO BOX 622, HUMBOLDT, IA 50548-0622
PO BOX 623, HUMBOLDT, IA 50548-0623
PO BOX 624, HUMBOLDT, IA 50548-0624
PO BOX 625, HUMBOLDT, IA 50548-0625
PO BOX 626, HUMBOLDT, IA 50548-0626
PO BOX 627, HUMBOLDT, IA 50548-0627
PO BOX 628, HUMBOLDT, IA 50548-0628
PO BOX 629, HUMBOLDT, IA 50548-0629
PO BOX 630, HUMBOLDT, IA 50548-0630
PO BOX 631, HUMBOLDT, IA 50548-0631
PO BOX 632, HUMBOLDT, IA 50548-0632
PO BOX 633, HUMBOLDT, IA 50548-0633
PO BOX 634, HUMBOLDT, IA 50548-0634
PO BOX 635, HUMBOLDT, IA 50548-0635
PO BOX 636, HUMBOLDT, IA 50548-0636
PO BOX 637, HUMBOLDT, IA 50548-0637
PO BOX 638, HUMBOLDT, IA 50548-0638
PO BOX 639, HUMBOLDT, IA 50548-0639
PO BOX 640, HUMBOLDT, IA 50548-0640
PO BOX 641, HUMBOLDT, IA 50548-0641
PO BOX 642, HUMBOLDT, IA 50548-0642
PO BOX 643, HUMBOLDT, IA 50548-0643
PO BOX 644, HUMBOLDT, IA 50548-0644
PO BOX 645, HUMBOLDT, IA 50548-0645
PO BOX 646, HUMBOLDT, IA 50548-0646
PO BOX 647, HUMBOLDT, IA 50548-0647
PO BOX 648, HUMBOLDT, IA 50548-0648
PO BOX 649, HUMBOLDT, IA 50548-0649
PO BOX 650, HUMBOLDT, IA 50548-0650
PO BOX 651, HUMBOLDT, IA 50548-0651
PO BOX 652, HUMBOLDT, IA 50548-0652
PO BOX 653, HUMBOLDT, IA 50548-0653
PO BOX 654, HUMBOLDT, IA 50548-0654
PO BOX 655, HUMBOLDT, IA 50548-0655
PO BOX 656, HUMBOLDT, IA 50548-0656
PO BOX 657, HUMBOLDT, IA 50548-0657
PO BOX 658, HUMBOLDT, IA 50548-0658
PO BOX 659, HUMBOLDT, IA 50548-0659
PO BOX 660, HUMBOLDT, IA 50548-0660
PO BOX 661, HUMBOLDT, IA 50548-0661
PO BOX 662, HUMBOLDT, IA 50548-0662
PO BOX 663, HUMBOLDT, IA 50548-0663
PO BOX 664, HUMBOLDT, IA 50548-0664
PO BOX 665, HUMBOLDT, IA 50548-0665
PO BOX 666, HUMBOLDT, IA 50548-0666
PO BOX 667, HUMBOLDT, IA 50548-0667
PO BOX 668, HUMBOLDT, IA 50548-0668
PO BOX 669, HUMBOLDT, IA 50548-0669
PO BOX 670, HUMBOLDT, IA 50548-0670
PO BOX 671, HUMBOLDT, IA 50548-0671
PO BOX 672, HUMBOLDT, IA 50548-0672
PO BOX 673, HUMBOLDT, IA 50548-0673
PO BOX 674, HUMBOLDT, IA 50548-0674
PO BOX 675, HUMBOLDT, IA 50548-0675
PO BOX 676, HUMBOLDT, IA 50548-0676
PO BOX 677, HUMBOLDT, IA 50548-0677
PO BOX 678, HUMBOLDT, IA 50548-0678
PO BOX 679, HUMBOLDT, IA 50548-0679
PO BOX 680, HUMBOLDT, IA 50548-0680
PO BOX 681, HUMBOLDT, IA 50548-0681
PO BOX 682, HUMBOLDT, IA 50548-0682
PO BOX 683, HUMBOLDT, IA 50548-0683
PO BOX 684, HUMBOLDT, IA 50548-0684
PO BOX 685, HUMBOLDT, IA 50548-0685
PO BOX 686, HUMBOLDT, IA 50548-0686
PO BOX 687, HUMBOLDT, IA 50548-0687
PO BOX 688, HUMBOLDT, IA 50548-0688
PO BOX 689, HUMBOLDT, IA 50548-0689
PO BOX 690, HUMBOLDT, IA 50548-0690
PO BOX 691, HUMBOLDT, IA 50548-0691
PO BOX 692, HUMBOLDT, IA 50548-0692
PO BOX 693, HUMBOLDT, IA 50548-0693
PO BOX 694, HUMBOLDT, IA 50548-0694
PO BOX 695, HUMBOLDT, IA 50548-0695
PO BOX 696, HUMBOLDT, IA 50548-0696
PO BOX 697, HUMBOLDT, IA 50548-0697
PO BOX 698, HUMBOLDT, IA 50548-0698
PO BOX 699, HUMBOLDT, IA 50548-0699
PO BOX 700, HUMBOLDT, IA 50548-0700
PO BOX 701, HUMBOLDT, IA 50548-0701
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