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 491, SPENCER, IA 51301-0491
PO BOX 492, SPENCER, IA 51301-0492
PO BOX 493, SPENCER, IA 51301-0493
PO BOX 494, SPENCER, IA 51301-0494
PO BOX 495, SPENCER, IA 51301-0495
PO BOX 496, SPENCER, IA 51301-0496
PO BOX 497, SPENCER, IA 51301-0497
PO BOX 498, SPENCER, IA 51301-0498
PO BOX 499, SPENCER, IA 51301-0499
PO BOX 500, SPENCER, IA 51301-0500
PO BOX 501, SPENCER, IA 51301-0501
PO BOX 502, SPENCER, IA 51301-0502
PO BOX 503, SPENCER, IA 51301-0503
PO BOX 504, SPENCER, IA 51301-0504
PO BOX 505, SPENCER, IA 51301-0505
PO BOX 506, SPENCER, IA 51301-0506
PO BOX 507, SPENCER, IA 51301-0507
PO BOX 508, SPENCER, IA 51301-0508
PO BOX 509, SPENCER, IA 51301-0509
PO BOX 510, SPENCER, IA 51301-0510
PO BOX 511, SPENCER, IA 51301-0511
PO BOX 512, SPENCER, IA 51301-0512
PO BOX 513, SPENCER, IA 51301-0513
PO BOX 514, SPENCER, IA 51301-0514
PO BOX 515, SPENCER, IA 51301-0515
PO BOX 516, SPENCER, IA 51301-0516
PO BOX 517, SPENCER, IA 51301-0517
PO BOX 518, SPENCER, IA 51301-0518
PO BOX 519, SPENCER, IA 51301-0519
PO BOX 520, SPENCER, IA 51301-0520
PO BOX 521, SPENCER, IA 51301-0521
PO BOX 522, SPENCER, IA 51301-0522
PO BOX 523, SPENCER, IA 51301-0523
PO BOX 524, SPENCER, IA 51301-0524
PO BOX 525, SPENCER, IA 51301-0525
PO BOX 526, SPENCER, IA 51301-0526
PO BOX 527, SPENCER, IA 51301-0527
PO BOX 528, SPENCER, IA 51301-0528
PO BOX 529, SPENCER, IA 51301-0529
PO BOX 530, SPENCER, IA 51301-0530
PO BOX 531, SPENCER, IA 51301-0531
PO BOX 532, SPENCER, IA 51301-0532
PO BOX 533, SPENCER, IA 51301-0533
PO BOX 534, SPENCER, IA 51301-0534
PO BOX 535, SPENCER, IA 51301-0535
PO BOX 536, SPENCER, IA 51301-0536
PO BOX 537, SPENCER, IA 51301-0537
PO BOX 538, SPENCER, IA 51301-0538
PO BOX 539, SPENCER, IA 51301-0539
PO BOX 540, SPENCER, IA 51301-0540
PO BOX 541, SPENCER, IA 51301-0541
PO BOX 542, SPENCER, IA 51301-0542
PO BOX 543, SPENCER, IA 51301-0543
PO BOX 544, SPENCER, IA 51301-0544
PO BOX 545, SPENCER, IA 51301-0545
PO BOX 546, SPENCER, IA 51301-0546
PO BOX 547, SPENCER, IA 51301-0547
PO BOX 548, SPENCER, IA 51301-0548
PO BOX 549, SPENCER, IA 51301-0549
PO BOX 550, SPENCER, IA 51301-0550
PO BOX 551, SPENCER, IA 51301-0551
PO BOX 552, SPENCER, IA 51301-0552
PO BOX 553, SPENCER, IA 51301-0553
PO BOX 554, SPENCER, IA 51301-0554
PO BOX 555, SPENCER, IA 51301-0555
PO BOX 556, SPENCER, IA 51301-0556
PO BOX 557, SPENCER, IA 51301-0557
PO BOX 558, SPENCER, IA 51301-0558
PO BOX 559, SPENCER, IA 51301-0559
PO BOX 560, SPENCER, IA 51301-0560
PO BOX 561, SPENCER, IA 51301-0561
PO BOX 562, SPENCER, IA 51301-0562
PO BOX 563, SPENCER, IA 51301-0563
PO BOX 564, SPENCER, IA 51301-0564
PO BOX 565, SPENCER, IA 51301-0565
PO BOX 566, SPENCER, IA 51301-0566
PO BOX 567, SPENCER, IA 51301-0567
PO BOX 568, SPENCER, IA 51301-0568
PO BOX 569, SPENCER, IA 51301-0569
PO BOX 570, SPENCER, IA 51301-0570
PO BOX 571, SPENCER, IA 51301-0571
PO BOX 572, SPENCER, IA 51301-0572
PO BOX 573, SPENCER, IA 51301-0573
PO BOX 574, SPENCER, IA 51301-0574
PO BOX 575, SPENCER, IA 51301-0575
PO BOX 576, SPENCER, IA 51301-0576
PO BOX 577, SPENCER, IA 51301-0577
PO BOX 578, SPENCER, IA 51301-0578
PO BOX 579, SPENCER, IA 51301-0579
PO BOX 580, SPENCER, IA 51301-0580
PO BOX 581, SPENCER, IA 51301-0581
PO BOX 582, SPENCER, IA 51301-0582
PO BOX 583, SPENCER, IA 51301-0583
PO BOX 584, SPENCER, IA 51301-0584
PO BOX 585, SPENCER, IA 51301-0585
PO BOX 586, SPENCER, IA 51301-0586
PO BOX 587, SPENCER, IA 51301-0587
PO BOX 588, SPENCER, IA 51301-0588
PO BOX 589, SPENCER, IA 51301-0589
PO BOX 590, SPENCER, IA 51301-0590
PO BOX 591, SPENCER, IA 51301-0591
PO BOX 592, SPENCER, IA 51301-0592
PO BOX 593, SPENCER, IA 51301-0593
PO BOX 594, SPENCER, IA 51301-0594
PO BOX 595, SPENCER, IA 51301-0595
PO BOX 596, SPENCER, IA 51301-0596
PO BOX 597, SPENCER, IA 51301-0597
PO BOX 598, SPENCER, IA 51301-0598
PO BOX 599, SPENCER, IA 51301-0599
PO BOX 600, SPENCER, IA 51301-0600
PO BOX 601, SPENCER, IA 51301-0601
PO BOX 602, SPENCER, IA 51301-0602
PO BOX 603, SPENCER, IA 51301-0603
PO BOX 604, SPENCER, IA 51301-0604
PO BOX 605, SPENCER, IA 51301-0605
PO BOX 606, SPENCER, IA 51301-0606
PO BOX 607, SPENCER, IA 51301-0607
PO BOX 608, SPENCER, IA 51301-0608
PO BOX 609, SPENCER, IA 51301-0609
PO BOX 610, SPENCER, IA 51301-0610
PO BOX 611, SPENCER, IA 51301-0611
PO BOX 612, SPENCER, IA 51301-0612
PO BOX 613, SPENCER, IA 51301-0613
PO BOX 614, SPENCER, IA 51301-0614
PO BOX 615, SPENCER, IA 51301-0615
PO BOX 616, SPENCER, IA 51301-0616
PO BOX 617, SPENCER, IA 51301-0617
PO BOX 618, SPENCER, IA 51301-0618
PO BOX 619, SPENCER, IA 51301-0619
PO BOX 620, SPENCER, IA 51301-0620
PO BOX 621, SPENCER, IA 51301-0621
PO BOX 622, SPENCER, IA 51301-0622
PO BOX 623, SPENCER, IA 51301-0623
PO BOX 624, SPENCER, IA 51301-0624
PO BOX 625, SPENCER, IA 51301-0625
PO BOX 626, SPENCER, IA 51301-0626
PO BOX 627, SPENCER, IA 51301-0627
PO BOX 628, SPENCER, IA 51301-0628
PO BOX 629, SPENCER, IA 51301-0629
PO BOX 630, SPENCER, IA 51301-0630
PO BOX 631, SPENCER, IA 51301-0631
PO BOX 632, SPENCER, IA 51301-0632
PO BOX 633, SPENCER, IA 51301-0633
PO BOX 634, SPENCER, IA 51301-0634
PO BOX 635, SPENCER, IA 51301-0635
PO BOX 636, SPENCER, IA 51301-0636
PO BOX 637, SPENCER, IA 51301-0637
PO BOX 638, SPENCER, IA 51301-0638
PO BOX 639, SPENCER, IA 51301-0639
PO BOX 640, SPENCER, IA 51301-0640
PO BOX 641, SPENCER, IA 51301-0641
PO BOX 642, SPENCER, IA 51301-0642
PO BOX 643, SPENCER, IA 51301-0643
PO BOX 644, SPENCER, IA 51301-0644
PO BOX 645, SPENCER, IA 51301-0645
PO BOX 646, SPENCER, IA 51301-0646
PO BOX 647, SPENCER, IA 51301-0647
PO BOX 648, SPENCER, IA 51301-0648
PO BOX 649, SPENCER, IA 51301-0649
PO BOX 650, SPENCER, IA 51301-0650
PO BOX 651, SPENCER, IA 51301-0651
PO BOX 652, SPENCER, IA 51301-0652
PO BOX 653, SPENCER, IA 51301-0653
PO BOX 654, SPENCER, IA 51301-0654
PO BOX 655, SPENCER, IA 51301-0655
PO BOX 656, SPENCER, IA 51301-0656
PO BOX 657, SPENCER, IA 51301-0657
PO BOX 658, SPENCER, IA 51301-0658
PO BOX 659, SPENCER, IA 51301-0659
PO BOX 660, SPENCER, IA 51301-0660
PO BOX 661, SPENCER, IA 51301-0661
PO BOX 662, SPENCER, IA 51301-0662
PO BOX 663, SPENCER, IA 51301-0663
PO BOX 664, SPENCER, IA 51301-0664
PO BOX 665, SPENCER, IA 51301-0665
PO BOX 666, SPENCER, IA 51301-0666
PO BOX 667, SPENCER, IA 51301-0667
PO BOX 668, SPENCER, IA 51301-0668
PO BOX 669, SPENCER, IA 51301-0669
PO BOX 670, SPENCER, IA 51301-0670
PO BOX 671, SPENCER, IA 51301-0671
PO BOX 672, SPENCER, IA 51301-0672
PO BOX 673, SPENCER, IA 51301-0673
PO BOX 674, SPENCER, IA 51301-0674
PO BOX 675, SPENCER, IA 51301-0675
PO BOX 676, SPENCER, IA 51301-0676
PO BOX 677, SPENCER, IA 51301-0677
PO BOX 678, SPENCER, IA 51301-0678
PO BOX 679, SPENCER, IA 51301-0679
PO BOX 680, SPENCER, IA 51301-0680
PO BOX 681, SPENCER, IA 51301-0681
PO BOX 682, SPENCER, IA 51301-0682
PO BOX 683, SPENCER, IA 51301-0683
PO BOX 684, SPENCER, IA 51301-0684
PO BOX 685, SPENCER, IA 51301-0685
PO BOX 686, SPENCER, IA 51301-0686
PO BOX 687, SPENCER, IA 51301-0687
PO BOX 688, SPENCER, IA 51301-0688
PO BOX 689, SPENCER, IA 51301-0689
PO BOX 690, SPENCER, IA 51301-0690
PO BOX 691, SPENCER, IA 51301-0691
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