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 471, WEST BURLINGTON, IA 52655-0471
PO BOX 472, WEST BURLINGTON, IA 52655-0472
PO BOX 473, WEST BURLINGTON, IA 52655-0473
PO BOX 474, WEST BURLINGTON, IA 52655-0474
PO BOX 475, WEST BURLINGTON, IA 52655-0475
PO BOX 476, WEST BURLINGTON, IA 52655-0476
PO BOX 477, WEST BURLINGTON, IA 52655-0477
PO BOX 478, WEST BURLINGTON, IA 52655-0478
PO BOX 479, WEST BURLINGTON, IA 52655-0479
PO BOX 480, WEST BURLINGTON, IA 52655-0480
PO BOX 481, WEST BURLINGTON, IA 52655-0481
PO BOX 482, WEST BURLINGTON, IA 52655-0482
PO BOX 483, WEST BURLINGTON, IA 52655-0483
PO BOX 484, WEST BURLINGTON, IA 52655-0484
PO BOX 485, WEST BURLINGTON, IA 52655-0485
PO BOX 486, WEST BURLINGTON, IA 52655-0486
PO BOX 487, WEST BURLINGTON, IA 52655-0487
PO BOX 488, WEST BURLINGTON, IA 52655-0488
PO BOX 489, WEST BURLINGTON, IA 52655-0489
PO BOX 490, WEST BURLINGTON, IA 52655-0490
PO BOX 491, WEST BURLINGTON, IA 52655-0491
PO BOX 492, WEST BURLINGTON, IA 52655-0492
PO BOX 493, WEST BURLINGTON, IA 52655-0493
PO BOX 494, WEST BURLINGTON, IA 52655-0494
PO BOX 495, WEST BURLINGTON, IA 52655-0495
PO BOX 496, WEST BURLINGTON, IA 52655-0496
PO BOX 497, WEST BURLINGTON, IA 52655-0497
PO BOX 498, WEST BURLINGTON, IA 52655-0498
PO BOX 499, WEST BURLINGTON, IA 52655-0499
PO BOX 500, WEST BURLINGTON, IA 52655-0500
PO BOX 501, WEST BURLINGTON, IA 52655-0501
PO BOX 502, WEST BURLINGTON, IA 52655-0502
PO BOX 503, WEST BURLINGTON, IA 52655-0503
PO BOX 504, WEST BURLINGTON, IA 52655-0504
PO BOX 505, WEST BURLINGTON, IA 52655-0505
PO BOX 506, WEST BURLINGTON, IA 52655-0506
PO BOX 507, WEST BURLINGTON, IA 52655-0507
PO BOX 508, WEST BURLINGTON, IA 52655-0508
PO BOX 509, WEST BURLINGTON, IA 52655-0509
PO BOX 510, WEST BURLINGTON, IA 52655-0510
PO BOX 511, WEST BURLINGTON, IA 52655-0511
PO BOX 512, WEST BURLINGTON, IA 52655-0512
PO BOX 513, WEST BURLINGTON, IA 52655-0513
PO BOX 514, WEST BURLINGTON, IA 52655-0514
PO BOX 515, WEST BURLINGTON, IA 52655-0515
PO BOX 516, WEST BURLINGTON, IA 52655-0516
PO BOX 517, WEST BURLINGTON, IA 52655-0517
PO BOX 518, WEST BURLINGTON, IA 52655-0518
PO BOX 519, WEST BURLINGTON, IA 52655-0519
PO BOX 520, WEST BURLINGTON, IA 52655-0520
PO BOX 521, WEST BURLINGTON, IA 52655-0521
PO BOX 522, WEST BURLINGTON, IA 52655-0522
PO BOX 523, WEST BURLINGTON, IA 52655-0523
PO BOX 524, WEST BURLINGTON, IA 52655-0524
PO BOX 525, WEST BURLINGTON, IA 52655-0525
PO BOX 526, WEST BURLINGTON, IA 52655-0526
PO BOX 527, WEST BURLINGTON, IA 52655-0527
PO BOX 528, WEST BURLINGTON, IA 52655-0528
PO BOX 529, WEST BURLINGTON, IA 52655-0529
PO BOX 530, WEST BURLINGTON, IA 52655-0530
PO BOX 531, WEST BURLINGTON, IA 52655-0531
PO BOX 532, WEST BURLINGTON, IA 52655-0532
PO BOX 533, WEST BURLINGTON, IA 52655-0533
PO BOX 534, WEST BURLINGTON, IA 52655-0534
PO BOX 535, WEST BURLINGTON, IA 52655-0535
PO BOX 536, WEST BURLINGTON, IA 52655-0536
PO BOX 537, WEST BURLINGTON, IA 52655-0537
PO BOX 538, WEST BURLINGTON, IA 52655-0538
PO BOX 539, WEST BURLINGTON, IA 52655-0539
PO BOX 540, WEST BURLINGTON, IA 52655-0540
PO BOX 541, WEST BURLINGTON, IA 52655-0541
PO BOX 542, WEST BURLINGTON, IA 52655-0542
PO BOX 543, WEST BURLINGTON, IA 52655-0543
PO BOX 544, WEST BURLINGTON, IA 52655-0544
PO BOX 545, WEST BURLINGTON, IA 52655-0545
PO BOX 546, WEST BURLINGTON, IA 52655-0546
PO BOX 547, WEST BURLINGTON, IA 52655-0547
PO BOX 548, WEST BURLINGTON, IA 52655-0548
PO BOX 549, WEST BURLINGTON, IA 52655-0549
PO BOX 550, WEST BURLINGTON, IA 52655-0550
PO BOX 551, WEST BURLINGTON, IA 52655-0551
PO BOX 552, WEST BURLINGTON, IA 52655-0552
PO BOX 553, WEST BURLINGTON, IA 52655-0553
PO BOX 554, WEST BURLINGTON, IA 52655-0554
PO BOX 555, WEST BURLINGTON, IA 52655-0555
PO BOX 556, WEST BURLINGTON, IA 52655-0556
PO BOX 557, WEST BURLINGTON, IA 52655-0557
PO BOX 558, WEST BURLINGTON, IA 52655-0558
PO BOX 559, WEST BURLINGTON, IA 52655-0559
PO BOX 560, WEST BURLINGTON, IA 52655-0560
PO BOX 561, WEST BURLINGTON, IA 52655-0561
PO BOX 562, WEST BURLINGTON, IA 52655-0562
PO BOX 563, WEST BURLINGTON, IA 52655-0563
PO BOX 564, WEST BURLINGTON, IA 52655-0564
PO BOX 565, WEST BURLINGTON, IA 52655-0565
PO BOX 566, WEST BURLINGTON, IA 52655-0566
PO BOX 567, WEST BURLINGTON, IA 52655-0567
PO BOX 568, WEST BURLINGTON, IA 52655-0568
PO BOX 569, WEST BURLINGTON, IA 52655-0569
PO BOX 570, WEST BURLINGTON, IA 52655-0570
PO BOX 571, WEST BURLINGTON, IA 52655-0571
PO BOX 572, WEST BURLINGTON, IA 52655-0572
PO BOX 573, WEST BURLINGTON, IA 52655-0573
PO BOX 574, WEST BURLINGTON, IA 52655-0574
PO BOX 575, WEST BURLINGTON, IA 52655-0575
PO BOX 576, WEST BURLINGTON, IA 52655-0576
PO BOX 577, WEST BURLINGTON, IA 52655-0577
PO BOX 578, WEST BURLINGTON, IA 52655-0578
PO BOX 579, WEST BURLINGTON, IA 52655-0579
PO BOX 580, WEST BURLINGTON, IA 52655-0580
PO BOX 581, WEST BURLINGTON, IA 52655-0581
PO BOX 582, WEST BURLINGTON, IA 52655-0582
PO BOX 583, WEST BURLINGTON, IA 52655-0583
PO BOX 584, WEST BURLINGTON, IA 52655-0584
PO BOX 585, WEST BURLINGTON, IA 52655-0585
PO BOX 586, WEST BURLINGTON, IA 52655-0586
PO BOX 587, WEST BURLINGTON, IA 52655-0587
PO BOX 588, WEST BURLINGTON, IA 52655-0588
PO BOX 589, WEST BURLINGTON, IA 52655-0589
PO BOX 590, WEST BURLINGTON, IA 52655-0590
PO BOX 591, WEST BURLINGTON, IA 52655-0591
PO BOX 592, WEST BURLINGTON, IA 52655-0592
PO BOX 593, WEST BURLINGTON, IA 52655-0593
PO BOX 594, WEST BURLINGTON, IA 52655-0594
PO BOX 595, WEST BURLINGTON, IA 52655-0595
PO BOX 596, WEST BURLINGTON, IA 52655-0596
PO BOX 597, WEST BURLINGTON, IA 52655-0597
PO BOX 598, WEST BURLINGTON, IA 52655-0598
PO BOX 599, WEST BURLINGTON, IA 52655-0599
PO BOX 600, WEST BURLINGTON, IA 52655-0600
PO BOX 601, WEST BURLINGTON, IA 52655-0601
PO BOX 602, WEST BURLINGTON, IA 52655-0602
PO BOX 603, WEST BURLINGTON, IA 52655-0603
PO BOX 604, WEST BURLINGTON, IA 52655-0604
PO BOX 605, WEST BURLINGTON, IA 52655-0605
PO BOX 606, WEST BURLINGTON, IA 52655-0606
PO BOX 607, WEST BURLINGTON, IA 52655-0607
PO BOX 608, WEST BURLINGTON, IA 52655-0608
PO BOX 609, WEST BURLINGTON, IA 52655-0609
PO BOX 610, WEST BURLINGTON, IA 52655-0610
PO BOX 611, WEST BURLINGTON, IA 52655-0611
PO BOX 612, WEST BURLINGTON, IA 52655-0612
PO BOX 613, WEST BURLINGTON, IA 52655-0613
PO BOX 614, WEST BURLINGTON, IA 52655-0614
PO BOX 615, WEST BURLINGTON, IA 52655-0615
PO BOX 616, WEST BURLINGTON, IA 52655-0616
PO BOX 617, WEST BURLINGTON, IA 52655-0617
PO BOX 618, WEST BURLINGTON, IA 52655-0618
PO BOX 619, WEST BURLINGTON, IA 52655-0619
PO BOX 620, WEST BURLINGTON, IA 52655-0620
PO BOX 621, WEST BURLINGTON, IA 52655-0621
PO BOX 622, WEST BURLINGTON, IA 52655-0622
PO BOX 623, WEST BURLINGTON, IA 52655-0623
PO BOX 624, WEST BURLINGTON, IA 52655-0624
PO BOX 625, WEST BURLINGTON, IA 52655-0625
PO BOX 626, WEST BURLINGTON, IA 52655-0626
PO BOX 627, WEST BURLINGTON, IA 52655-0627
PO BOX 628, WEST BURLINGTON, IA 52655-0628
PO BOX 629, WEST BURLINGTON, IA 52655-0629
PO BOX 630, WEST BURLINGTON, IA 52655-0630
PO BOX 631, WEST BURLINGTON, IA 52655-0631
PO BOX 632, WEST BURLINGTON, IA 52655-0632
PO BOX 633, WEST BURLINGTON, IA 52655-0633
PO BOX 634, WEST BURLINGTON, IA 52655-0634
PO BOX 635, WEST BURLINGTON, IA 52655-0635
PO BOX 636, WEST BURLINGTON, IA 52655-0636
PO BOX 637, WEST BURLINGTON, IA 52655-0637
PO BOX 638, WEST BURLINGTON, IA 52655-0638
PO BOX 639, WEST BURLINGTON, IA 52655-0639
PO BOX 640, WEST BURLINGTON, IA 52655-0640
PO BOX 641, WEST BURLINGTON, IA 52655-0641
PO BOX 642, WEST BURLINGTON, IA 52655-0642
PO BOX 643, WEST BURLINGTON, IA 52655-0643
PO BOX 644, WEST BURLINGTON, IA 52655-0644
PO BOX 645, WEST BURLINGTON, IA 52655-0645
PO BOX 646, WEST BURLINGTON, IA 52655-0646
PO BOX 647, WEST BURLINGTON, IA 52655-0647
PO BOX 648, WEST BURLINGTON, IA 52655-0648
PO BOX 649, WEST BURLINGTON, IA 52655-0649
PO BOX 650, WEST BURLINGTON, IA 52655-0650
PO BOX 651, WEST BURLINGTON, IA 52655-0651
PO BOX 652, WEST BURLINGTON, IA 52655-0652
PO BOX 653, WEST BURLINGTON, IA 52655-0653
PO BOX 654, WEST BURLINGTON, IA 52655-0654
PO BOX 655, WEST BURLINGTON, IA 52655-0655
PO BOX 656, WEST BURLINGTON, IA 52655-0656
PO BOX 657, WEST BURLINGTON, IA 52655-0657
PO BOX 658, WEST BURLINGTON, IA 52655-0658
PO BOX 659, WEST BURLINGTON, IA 52655-0659
PO BOX 660, WEST BURLINGTON, IA 52655-0660
PO BOX 661, WEST BURLINGTON, IA 52655-0661
PO BOX 662, WEST BURLINGTON, IA 52655-0662
PO BOX 663, WEST BURLINGTON, IA 52655-0663
PO BOX 664, WEST BURLINGTON, IA 52655-0664
PO BOX 665, WEST BURLINGTON, IA 52655-0665
PO BOX 666, WEST BURLINGTON, IA 52655-0666
PO BOX 667, WEST BURLINGTON, IA 52655-0667
PO BOX 668, WEST BURLINGTON, IA 52655-0668
PO BOX 669, WEST BURLINGTON, IA 52655-0669
PO BOX 670, WEST BURLINGTON, IA 52655-0670
PO BOX 671, WEST BURLINGTON, IA 52655-0671
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