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, GEORGE, IA 51237-0491
PO BOX 492, GEORGE, IA 51237-0492
PO BOX 493, GEORGE, IA 51237-0493
PO BOX 494, GEORGE, IA 51237-0494
PO BOX 495, GEORGE, IA 51237-0495
PO BOX 496, GEORGE, IA 51237-0496
PO BOX 497, GEORGE, IA 51237-0497
PO BOX 498, GEORGE, IA 51237-0498
PO BOX 499, GEORGE, IA 51237-0499
PO BOX 500, GEORGE, IA 51237-0500
PO BOX 501, GEORGE, IA 51237-0501
PO BOX 502, GEORGE, IA 51237-0502
PO BOX 503, GEORGE, IA 51237-0503
PO BOX 504, GEORGE, IA 51237-0504
PO BOX 505, GEORGE, IA 51237-0505
PO BOX 506, GEORGE, IA 51237-0506
PO BOX 507, GEORGE, IA 51237-0507
PO BOX 508, GEORGE, IA 51237-0508
PO BOX 509, GEORGE, IA 51237-0509
PO BOX 510, GEORGE, IA 51237-0510
PO BOX 511, GEORGE, IA 51237-0511
PO BOX 512, GEORGE, IA 51237-0512
PO BOX 513, GEORGE, IA 51237-0513
PO BOX 514, GEORGE, IA 51237-0514
PO BOX 515, GEORGE, IA 51237-0515
PO BOX 516, GEORGE, IA 51237-0516
PO BOX 517, GEORGE, IA 51237-0517
PO BOX 518, GEORGE, IA 51237-0518
PO BOX 519, GEORGE, IA 51237-0519
PO BOX 520, GEORGE, IA 51237-0520
PO BOX 521, GEORGE, IA 51237-0521
PO BOX 522, GEORGE, IA 51237-0522
PO BOX 523, GEORGE, IA 51237-0523
PO BOX 524, GEORGE, IA 51237-0524
PO BOX 525, GEORGE, IA 51237-0525
PO BOX 526, GEORGE, IA 51237-0526
PO BOX 527, GEORGE, IA 51237-0527
PO BOX 528, GEORGE, IA 51237-0528
PO BOX 529, GEORGE, IA 51237-0529
PO BOX 530, GEORGE, IA 51237-0530
PO BOX 531, GEORGE, IA 51237-0531
PO BOX 532, GEORGE, IA 51237-0532
PO BOX 533, GEORGE, IA 51237-0533
PO BOX 534, GEORGE, IA 51237-0534
PO BOX 535, GEORGE, IA 51237-0535
PO BOX 536, GEORGE, IA 51237-0536
PO BOX 537, GEORGE, IA 51237-0537
PO BOX 538, GEORGE, IA 51237-0538
PO BOX 539, GEORGE, IA 51237-0539
PO BOX 540, GEORGE, IA 51237-0540
PO BOX 541, GEORGE, IA 51237-0541
PO BOX 542, GEORGE, IA 51237-0542
PO BOX 543, GEORGE, IA 51237-0543
PO BOX 544, GEORGE, IA 51237-0544
PO BOX 545, GEORGE, IA 51237-0545
PO BOX 546, GEORGE, IA 51237-0546
PO BOX 547, GEORGE, IA 51237-0547
PO BOX 548, GEORGE, IA 51237-0548
PO BOX 549, GEORGE, IA 51237-0549
PO BOX 550, GEORGE, IA 51237-0550
PO BOX 551, GEORGE, IA 51237-0551
PO BOX 552, GEORGE, IA 51237-0552
PO BOX 553, GEORGE, IA 51237-0553
PO BOX 554, GEORGE, IA 51237-0554
PO BOX 555, GEORGE, IA 51237-0555
PO BOX 556, GEORGE, IA 51237-0556
PO BOX 557, GEORGE, IA 51237-0557
PO BOX 558, GEORGE, IA 51237-0558
PO BOX 559, GEORGE, IA 51237-0559
PO BOX 560, GEORGE, IA 51237-0560
PO BOX 561, GEORGE, IA 51237-0561
PO BOX 562, GEORGE, IA 51237-0562
PO BOX 563, GEORGE, IA 51237-0563
PO BOX 564, GEORGE, IA 51237-0564
PO BOX 565, GEORGE, IA 51237-0565
PO BOX 566, GEORGE, IA 51237-0566
PO BOX 567, GEORGE, IA 51237-0567
PO BOX 568, GEORGE, IA 51237-0568
PO BOX 569, GEORGE, IA 51237-0569
PO BOX 570, GEORGE, IA 51237-0570
PO BOX 571, GEORGE, IA 51237-0571
PO BOX 572, GEORGE, IA 51237-0572
PO BOX 573, GEORGE, IA 51237-0573
PO BOX 574, GEORGE, IA 51237-0574
PO BOX 575, GEORGE, IA 51237-0575
PO BOX 576, GEORGE, IA 51237-0576
PO BOX 577, GEORGE, IA 51237-0577
PO BOX 578, GEORGE, IA 51237-0578
PO BOX 579, GEORGE, IA 51237-0579
PO BOX 580, GEORGE, IA 51237-0580
PO BOX 581, GEORGE, IA 51237-0581
PO BOX 582, GEORGE, IA 51237-0582
PO BOX 583, GEORGE, IA 51237-0583
PO BOX 584, GEORGE, IA 51237-0584
PO BOX 585, GEORGE, IA 51237-0585
PO BOX 586, GEORGE, IA 51237-0586
PO BOX 587, GEORGE, IA 51237-0587
PO BOX 588, GEORGE, IA 51237-0588
PO BOX 589, GEORGE, IA 51237-0589
PO BOX 590, GEORGE, IA 51237-0590
PO BOX 591, GEORGE, IA 51237-0591
PO BOX 592, GEORGE, IA 51237-0592
PO BOX 593, GEORGE, IA 51237-0593
PO BOX 594, GEORGE, IA 51237-0594
PO BOX 595, GEORGE, IA 51237-0595
PO BOX 596, GEORGE, IA 51237-0596
PO BOX 597, GEORGE, IA 51237-0597
PO BOX 598, GEORGE, IA 51237-0598
PO BOX 599, GEORGE, IA 51237-0599
PO BOX 600, GEORGE, IA 51237-0600
PO BOX 601, GEORGE, IA 51237-0601
PO BOX 602, GEORGE, IA 51237-0602
PO BOX 603, GEORGE, IA 51237-0603
PO BOX 604, GEORGE, IA 51237-0604
PO BOX 605, GEORGE, IA 51237-0605
PO BOX 606, GEORGE, IA 51237-0606
PO BOX 607, GEORGE, IA 51237-0607
PO BOX 608, GEORGE, IA 51237-0608
PO BOX 609, GEORGE, IA 51237-0609
PO BOX 610, GEORGE, IA 51237-0610
PO BOX 611, GEORGE, IA 51237-0611
PO BOX 612, GEORGE, IA 51237-0612
PO BOX 613, GEORGE, IA 51237-0613
PO BOX 614, GEORGE, IA 51237-0614
PO BOX 615, GEORGE, IA 51237-0615
PO BOX 616, GEORGE, IA 51237-0616
PO BOX 617, GEORGE, IA 51237-0617
PO BOX 618, GEORGE, IA 51237-0618
PO BOX 619, GEORGE, IA 51237-0619
PO BOX 620, GEORGE, IA 51237-0620
PO BOX 621, GEORGE, IA 51237-0621
PO BOX 622, GEORGE, IA 51237-0622
PO BOX 623, GEORGE, IA 51237-0623
PO BOX 624, GEORGE, IA 51237-0624
PO BOX 625, GEORGE, IA 51237-0625
PO BOX 626, GEORGE, IA 51237-0626
PO BOX 627, GEORGE, IA 51237-0627
PO BOX 628, GEORGE, IA 51237-0628
PO BOX 629, GEORGE, IA 51237-0629
PO BOX 630, GEORGE, IA 51237-0630
PO BOX 631, GEORGE, IA 51237-0631
PO BOX 632, GEORGE, IA 51237-0632
PO BOX 633, GEORGE, IA 51237-0633
PO BOX 634, GEORGE, IA 51237-0634
PO BOX 635, GEORGE, IA 51237-0635
PO BOX 636, GEORGE, IA 51237-0636
PO BOX 637, GEORGE, IA 51237-0637
PO BOX 638, GEORGE, IA 51237-0638
PO BOX 639, GEORGE, IA 51237-0639
PO BOX 640, GEORGE, IA 51237-0640
PO BOX 641, GEORGE, IA 51237-0641
PO BOX 642, GEORGE, IA 51237-0642
PO BOX 643, GEORGE, IA 51237-0643
PO BOX 644, GEORGE, IA 51237-0644
PO BOX 645, GEORGE, IA 51237-0645
PO BOX 646, GEORGE, IA 51237-0646
PO BOX 647, GEORGE, IA 51237-0647
PO BOX 648, GEORGE, IA 51237-0648
PO BOX 649, GEORGE, IA 51237-0649
PO BOX 650, GEORGE, IA 51237-0650
PO BOX 651, GEORGE, IA 51237-0651
PO BOX 652, GEORGE, IA 51237-0652
PO BOX 653, GEORGE, IA 51237-0653
PO BOX 654, GEORGE, IA 51237-0654
PO BOX 655, GEORGE, IA 51237-0655
PO BOX 656, GEORGE, IA 51237-0656
PO BOX 657, GEORGE, IA 51237-0657
PO BOX 658, GEORGE, IA 51237-0658
PO BOX 659, GEORGE, IA 51237-0659
PO BOX 660, GEORGE, IA 51237-0660
PO BOX 661, GEORGE, IA 51237-0661
PO BOX 662, GEORGE, IA 51237-0662
PO BOX 663, GEORGE, IA 51237-0663
PO BOX 664, GEORGE, IA 51237-0664
PO BOX 665, GEORGE, IA 51237-0665
PO BOX 666, GEORGE, IA 51237-0666
PO BOX 667, GEORGE, IA 51237-0667
PO BOX 668, GEORGE, IA 51237-0668
PO BOX 669, GEORGE, IA 51237-0669
PO BOX 670, GEORGE, IA 51237-0670
PO BOX 671, GEORGE, IA 51237-0671
PO BOX 672, GEORGE, IA 51237-0672
PO BOX 673, GEORGE, IA 51237-0673
PO BOX 674, GEORGE, IA 51237-0674
PO BOX 675, GEORGE, IA 51237-0675
PO BOX 676, GEORGE, IA 51237-0676
PO BOX 677, GEORGE, IA 51237-0677
PO BOX 678, GEORGE, IA 51237-0678
PO BOX 679, GEORGE, IA 51237-0679
PO BOX 680, GEORGE, IA 51237-0680
PO BOX 681, GEORGE, IA 51237-0681
PO BOX 682, GEORGE, IA 51237-0682
PO BOX 683, GEORGE, IA 51237-0683
PO BOX 684, GEORGE, IA 51237-0684
PO BOX 685, GEORGE, IA 51237-0685
PO BOX 686, GEORGE, IA 51237-0686
PO BOX 687, GEORGE, IA 51237-0687
PO BOX 688, GEORGE, IA 51237-0688
PO BOX 689, GEORGE, IA 51237-0689
PO BOX 690, GEORGE, IA 51237-0690
PO BOX 691, GEORGE, IA 51237-0691
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