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, CALMAR, IA 52132-0501
PO BOX 502, CALMAR, IA 52132-0502
PO BOX 503, CALMAR, IA 52132-0503
PO BOX 504, CALMAR, IA 52132-0504
PO BOX 505, CALMAR, IA 52132-0505
PO BOX 506, CALMAR, IA 52132-0506
PO BOX 507, CALMAR, IA 52132-0507
PO BOX 508, CALMAR, IA 52132-0508
PO BOX 509, CALMAR, IA 52132-0509
PO BOX 510, CALMAR, IA 52132-0510
PO BOX 511, CALMAR, IA 52132-0511
PO BOX 512, CALMAR, IA 52132-0512
PO BOX 513, CALMAR, IA 52132-0513
PO BOX 514, CALMAR, IA 52132-0514
PO BOX 515, CALMAR, IA 52132-0515
PO BOX 516, CALMAR, IA 52132-0516
PO BOX 517, CALMAR, IA 52132-0517
PO BOX 518, CALMAR, IA 52132-0518
PO BOX 519, CALMAR, IA 52132-0519
PO BOX 520, CALMAR, IA 52132-0520
PO BOX 521, CALMAR, IA 52132-0521
PO BOX 522, CALMAR, IA 52132-0522
PO BOX 523, CALMAR, IA 52132-0523
PO BOX 524, CALMAR, IA 52132-0524
PO BOX 525, CALMAR, IA 52132-0525
PO BOX 526, CALMAR, IA 52132-0526
PO BOX 527, CALMAR, IA 52132-0527
PO BOX 528, CALMAR, IA 52132-0528
PO BOX 529, CALMAR, IA 52132-0529
PO BOX 530, CALMAR, IA 52132-0530
PO BOX 531, CALMAR, IA 52132-0531
PO BOX 532, CALMAR, IA 52132-0532
PO BOX 533, CALMAR, IA 52132-0533
PO BOX 534, CALMAR, IA 52132-0534
PO BOX 535, CALMAR, IA 52132-0535
PO BOX 536, CALMAR, IA 52132-0536
PO BOX 537, CALMAR, IA 52132-0537
PO BOX 538, CALMAR, IA 52132-0538
PO BOX 539, CALMAR, IA 52132-0539
PO BOX 540, CALMAR, IA 52132-0540
PO BOX 541, CALMAR, IA 52132-0541
PO BOX 542, CALMAR, IA 52132-0542
PO BOX 543, CALMAR, IA 52132-0543
PO BOX 544, CALMAR, IA 52132-0544
PO BOX 545, CALMAR, IA 52132-0545
PO BOX 546, CALMAR, IA 52132-0546
PO BOX 547, CALMAR, IA 52132-0547
PO BOX 548, CALMAR, IA 52132-0548
PO BOX 549, CALMAR, IA 52132-0549
PO BOX 550, CALMAR, IA 52132-0550
PO BOX 551, CALMAR, IA 52132-0551
PO BOX 552, CALMAR, IA 52132-0552
PO BOX 553, CALMAR, IA 52132-0553
PO BOX 554, CALMAR, IA 52132-0554
PO BOX 555, CALMAR, IA 52132-0555
PO BOX 556, CALMAR, IA 52132-0556
PO BOX 557, CALMAR, IA 52132-0557
PO BOX 558, CALMAR, IA 52132-0558
PO BOX 559, CALMAR, IA 52132-0559
PO BOX 560, CALMAR, IA 52132-0560
PO BOX 561, CALMAR, IA 52132-0561
PO BOX 562, CALMAR, IA 52132-0562
PO BOX 563, CALMAR, IA 52132-0563
PO BOX 564, CALMAR, IA 52132-0564
PO BOX 565, CALMAR, IA 52132-0565
PO BOX 566, CALMAR, IA 52132-0566
PO BOX 567, CALMAR, IA 52132-0567
PO BOX 568, CALMAR, IA 52132-0568
PO BOX 569, CALMAR, IA 52132-0569
PO BOX 570, CALMAR, IA 52132-0570
PO BOX 571, CALMAR, IA 52132-0571
PO BOX 572, CALMAR, IA 52132-0572
PO BOX 573, CALMAR, IA 52132-0573
PO BOX 574, CALMAR, IA 52132-0574
PO BOX 575, CALMAR, IA 52132-0575
PO BOX 576, CALMAR, IA 52132-0576
PO BOX 577, CALMAR, IA 52132-0577
PO BOX 578, CALMAR, IA 52132-0578
PO BOX 579, CALMAR, IA 52132-0579
PO BOX 580, CALMAR, IA 52132-0580
PO BOX 581, CALMAR, IA 52132-0581
PO BOX 582, CALMAR, IA 52132-0582
PO BOX 583, CALMAR, IA 52132-0583
PO BOX 584, CALMAR, IA 52132-0584
PO BOX 585, CALMAR, IA 52132-0585
PO BOX 586, CALMAR, IA 52132-0586
PO BOX 587, CALMAR, IA 52132-0587
PO BOX 588, CALMAR, IA 52132-0588
PO BOX 589, CALMAR, IA 52132-0589
PO BOX 590, CALMAR, IA 52132-0590
PO BOX 591, CALMAR, IA 52132-0591
PO BOX 592, CALMAR, IA 52132-0592
PO BOX 593, CALMAR, IA 52132-0593
PO BOX 594, CALMAR, IA 52132-0594
PO BOX 595, CALMAR, IA 52132-0595
PO BOX 596, CALMAR, IA 52132-0596
PO BOX 597, CALMAR, IA 52132-0597
PO BOX 598, CALMAR, IA 52132-0598
PO BOX 599, CALMAR, IA 52132-0599
PO BOX 600, CALMAR, IA 52132-0600
PO BOX 601, CALMAR, IA 52132-0601
PO BOX 602, CALMAR, IA 52132-0602
PO BOX 603, CALMAR, IA 52132-0603
PO BOX 604, CALMAR, IA 52132-0604
PO BOX 605, CALMAR, IA 52132-0605
PO BOX 606, CALMAR, IA 52132-0606
PO BOX 607, CALMAR, IA 52132-0607
PO BOX 608, CALMAR, IA 52132-0608
PO BOX 609, CALMAR, IA 52132-0609
PO BOX 610, CALMAR, IA 52132-0610
PO BOX 611, CALMAR, IA 52132-0611
PO BOX 612, CALMAR, IA 52132-0612
PO BOX 613, CALMAR, IA 52132-0613
PO BOX 614, CALMAR, IA 52132-0614
PO BOX 615, CALMAR, IA 52132-0615
PO BOX 616, CALMAR, IA 52132-0616
PO BOX 617, CALMAR, IA 52132-0617
PO BOX 618, CALMAR, IA 52132-0618
PO BOX 619, CALMAR, IA 52132-0619
PO BOX 620, CALMAR, IA 52132-0620
PO BOX 621, CALMAR, IA 52132-0621
PO BOX 622, CALMAR, IA 52132-0622
PO BOX 623, CALMAR, IA 52132-0623
PO BOX 624, CALMAR, IA 52132-0624
PO BOX 625, CALMAR, IA 52132-0625
PO BOX 626, CALMAR, IA 52132-0626
PO BOX 627, CALMAR, IA 52132-0627
PO BOX 628, CALMAR, IA 52132-0628
PO BOX 629, CALMAR, IA 52132-0629
PO BOX 630, CALMAR, IA 52132-0630
PO BOX 631, CALMAR, IA 52132-0631
PO BOX 632, CALMAR, IA 52132-0632
PO BOX 633, CALMAR, IA 52132-0633
PO BOX 634, CALMAR, IA 52132-0634
PO BOX 635, CALMAR, IA 52132-0635
PO BOX 636, CALMAR, IA 52132-0636
PO BOX 637, CALMAR, IA 52132-0637
PO BOX 638, CALMAR, IA 52132-0638
PO BOX 639, CALMAR, IA 52132-0639
PO BOX 640, CALMAR, IA 52132-0640
PO BOX 641, CALMAR, IA 52132-0641
PO BOX 642, CALMAR, IA 52132-0642
PO BOX 643, CALMAR, IA 52132-0643
PO BOX 644, CALMAR, IA 52132-0644
PO BOX 645, CALMAR, IA 52132-0645
PO BOX 646, CALMAR, IA 52132-0646
PO BOX 647, CALMAR, IA 52132-0647
PO BOX 648, CALMAR, IA 52132-0648
PO BOX 649, CALMAR, IA 52132-0649
PO BOX 650, CALMAR, IA 52132-0650
PO BOX 651, CALMAR, IA 52132-0651
PO BOX 652, CALMAR, IA 52132-0652
PO BOX 653, CALMAR, IA 52132-0653
PO BOX 654, CALMAR, IA 52132-0654
PO BOX 655, CALMAR, IA 52132-0655
PO BOX 656, CALMAR, IA 52132-0656
PO BOX 657, CALMAR, IA 52132-0657
PO BOX 658, CALMAR, IA 52132-0658
PO BOX 659, CALMAR, IA 52132-0659
PO BOX 660, CALMAR, IA 52132-0660
PO BOX 661, CALMAR, IA 52132-0661
PO BOX 662, CALMAR, IA 52132-0662
PO BOX 663, CALMAR, IA 52132-0663
PO BOX 664, CALMAR, IA 52132-0664
PO BOX 665, CALMAR, IA 52132-0665
PO BOX 666, CALMAR, IA 52132-0666
PO BOX 667, CALMAR, IA 52132-0667
PO BOX 668, CALMAR, IA 52132-0668
PO BOX 669, CALMAR, IA 52132-0669
PO BOX 670, CALMAR, IA 52132-0670
PO BOX 671, CALMAR, IA 52132-0671
PO BOX 672, CALMAR, IA 52132-0672
PO BOX 673, CALMAR, IA 52132-0673
PO BOX 674, CALMAR, IA 52132-0674
PO BOX 675, CALMAR, IA 52132-0675
PO BOX 676, CALMAR, IA 52132-0676
PO BOX 677, CALMAR, IA 52132-0677
PO BOX 678, CALMAR, IA 52132-0678
PO BOX 679, CALMAR, IA 52132-0679
PO BOX 680, CALMAR, IA 52132-0680
PO BOX 681, CALMAR, IA 52132-0681
PO BOX 682, CALMAR, IA 52132-0682
PO BOX 683, CALMAR, IA 52132-0683
PO BOX 684, CALMAR, IA 52132-0684
PO BOX 685, CALMAR, IA 52132-0685
PO BOX 686, CALMAR, IA 52132-0686
PO BOX 687, CALMAR, IA 52132-0687
PO BOX 688, CALMAR, IA 52132-0688
PO BOX 689, CALMAR, IA 52132-0689
PO BOX 690, CALMAR, IA 52132-0690
PO BOX 691, CALMAR, IA 52132-0691
PO BOX 692, CALMAR, IA 52132-0692
PO BOX 693, CALMAR, IA 52132-0693
PO BOX 694, CALMAR, IA 52132-0694
PO BOX 695, CALMAR, IA 52132-0695
PO BOX 696, CALMAR, IA 52132-0696
PO BOX 697, CALMAR, IA 52132-0697
PO BOX 698, CALMAR, IA 52132-0698
PO BOX 699, CALMAR, IA 52132-0699
PO BOX 700, CALMAR, IA 52132-0700
PO BOX 701, CALMAR, IA 52132-0701
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