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 512, SAINT BERNARD, LA 70085-0512
PO BOX 513, SAINT BERNARD, LA 70085-0513
PO BOX 514, SAINT BERNARD, LA 70085-0514
PO BOX 515, SAINT BERNARD, LA 70085-0515
PO BOX 516, SAINT BERNARD, LA 70085-0516
PO BOX 517, SAINT BERNARD, LA 70085-0517
PO BOX 518, SAINT BERNARD, LA 70085-0518
PO BOX 519, SAINT BERNARD, LA 70085-0519
PO BOX 520, SAINT BERNARD, LA 70085-0520
PO BOX 521, SAINT BERNARD, LA 70085-0521
PO BOX 522, SAINT BERNARD, LA 70085-0522
PO BOX 523, SAINT BERNARD, LA 70085-0523
PO BOX 524, SAINT BERNARD, LA 70085-0524
PO BOX 525, SAINT BERNARD, LA 70085-0525
PO BOX 526, SAINT BERNARD, LA 70085-0526
PO BOX 527, SAINT BERNARD, LA 70085-0527
PO BOX 528, SAINT BERNARD, LA 70085-0528
PO BOX 529, SAINT BERNARD, LA 70085-0529
PO BOX 530, SAINT BERNARD, LA 70085-0530
PO BOX 531, SAINT BERNARD, LA 70085-0531
PO BOX 532, SAINT BERNARD, LA 70085-0532
PO BOX 533, SAINT BERNARD, LA 70085-0533
PO BOX 534, SAINT BERNARD, LA 70085-0534
PO BOX 535, SAINT BERNARD, LA 70085-0535
PO BOX 536, SAINT BERNARD, LA 70085-0536
PO BOX 537, SAINT BERNARD, LA 70085-0537
PO BOX 538, SAINT BERNARD, LA 70085-0538
PO BOX 539, SAINT BERNARD, LA 70085-0539
PO BOX 540, SAINT BERNARD, LA 70085-0540
PO BOX 541, SAINT BERNARD, LA 70085-0541
PO BOX 542, SAINT BERNARD, LA 70085-0542
PO BOX 543, SAINT BERNARD, LA 70085-0543
PO BOX 544, SAINT BERNARD, LA 70085-0544
PO BOX 545, SAINT BERNARD, LA 70085-0545
PO BOX 546, SAINT BERNARD, LA 70085-0546
PO BOX 547, SAINT BERNARD, LA 70085-0547
PO BOX 548, SAINT BERNARD, LA 70085-0548
PO BOX 549, SAINT BERNARD, LA 70085-0549
PO BOX 550, SAINT BERNARD, LA 70085-0550
PO BOX 551, SAINT BERNARD, LA 70085-0551
PO BOX 552, SAINT BERNARD, LA 70085-0552
PO BOX 553, SAINT BERNARD, LA 70085-0553
PO BOX 554, SAINT BERNARD, LA 70085-0554
PO BOX 555, SAINT BERNARD, LA 70085-0555
PO BOX 556, SAINT BERNARD, LA 70085-0556
PO BOX 557, SAINT BERNARD, LA 70085-0557
PO BOX 558, SAINT BERNARD, LA 70085-0558
PO BOX 559, SAINT BERNARD, LA 70085-0559
PO BOX 560, SAINT BERNARD, LA 70085-0560
PO BOX 561, SAINT BERNARD, LA 70085-0561
PO BOX 562, SAINT BERNARD, LA 70085-0562
PO BOX 563, SAINT BERNARD, LA 70085-0563
PO BOX 564, SAINT BERNARD, LA 70085-0564
PO BOX 565, SAINT BERNARD, LA 70085-0565
PO BOX 566, SAINT BERNARD, LA 70085-0566
PO BOX 567, SAINT BERNARD, LA 70085-0567
PO BOX 568, SAINT BERNARD, LA 70085-0568
PO BOX 569, SAINT BERNARD, LA 70085-0569
PO BOX 570, SAINT BERNARD, LA 70085-0570
PO BOX 571, SAINT BERNARD, LA 70085-0571
PO BOX 572, SAINT BERNARD, LA 70085-0572
PO BOX 573, SAINT BERNARD, LA 70085-0573
PO BOX 574, SAINT BERNARD, LA 70085-0574
PO BOX 575, SAINT BERNARD, LA 70085-0575
PO BOX 576, SAINT BERNARD, LA 70085-0576
PO BOX 577, SAINT BERNARD, LA 70085-0577
PO BOX 578, SAINT BERNARD, LA 70085-0578
PO BOX 579, SAINT BERNARD, LA 70085-0579
PO BOX 580, SAINT BERNARD, LA 70085-0580
PO BOX 581, SAINT BERNARD, LA 70085-0581
PO BOX 582, SAINT BERNARD, LA 70085-0582
PO BOX 583, SAINT BERNARD, LA 70085-0583
PO BOX 584, SAINT BERNARD, LA 70085-0584
PO BOX 585, SAINT BERNARD, LA 70085-0585
PO BOX 586, SAINT BERNARD, LA 70085-0586
PO BOX 587, SAINT BERNARD, LA 70085-0587
PO BOX 588, SAINT BERNARD, LA 70085-0588
PO BOX 589, SAINT BERNARD, LA 70085-0589
PO BOX 590, SAINT BERNARD, LA 70085-0590
PO BOX 591, SAINT BERNARD, LA 70085-0591
PO BOX 592, SAINT BERNARD, LA 70085-0592
PO BOX 593, SAINT BERNARD, LA 70085-0593
PO BOX 594, SAINT BERNARD, LA 70085-0594
PO BOX 595, SAINT BERNARD, LA 70085-0595
PO BOX 596, SAINT BERNARD, LA 70085-0596
PO BOX 597, SAINT BERNARD, LA 70085-0597
PO BOX 598, SAINT BERNARD, LA 70085-0598
PO BOX 599, SAINT BERNARD, LA 70085-0599
PO BOX 600, SAINT BERNARD, LA 70085-0600
PO BOX 601, SAINT BERNARD, LA 70085-0601
PO BOX 602, SAINT BERNARD, LA 70085-0602
PO BOX 603, SAINT BERNARD, LA 70085-0603
PO BOX 604, SAINT BERNARD, LA 70085-0604
PO BOX 605, SAINT BERNARD, LA 70085-0605
PO BOX 606, SAINT BERNARD, LA 70085-0606
PO BOX 607, SAINT BERNARD, LA 70085-0607
PO BOX 608, SAINT BERNARD, LA 70085-0608
PO BOX 609, SAINT BERNARD, LA 70085-0609
PO BOX 610, SAINT BERNARD, LA 70085-0610
PO BOX 611, SAINT BERNARD, LA 70085-0611
PO BOX 612, SAINT BERNARD, LA 70085-0612
PO BOX 613, SAINT BERNARD, LA 70085-0613
PO BOX 614, SAINT BERNARD, LA 70085-0614
PO BOX 615, SAINT BERNARD, LA 70085-0615
PO BOX 616, SAINT BERNARD, LA 70085-0616
PO BOX 617, SAINT BERNARD, LA 70085-0617
PO BOX 618, SAINT BERNARD, LA 70085-0618
PO BOX 619, SAINT BERNARD, LA 70085-0619
PO BOX 620, SAINT BERNARD, LA 70085-0620
PO BOX 621, SAINT BERNARD, LA 70085-0621
PO BOX 622, SAINT BERNARD, LA 70085-0622
PO BOX 623, SAINT BERNARD, LA 70085-0623
PO BOX 624, SAINT BERNARD, LA 70085-0624
PO BOX 625, SAINT BERNARD, LA 70085-0625
PO BOX 626, SAINT BERNARD, LA 70085-0626
PO BOX 627, SAINT BERNARD, LA 70085-0627
PO BOX 628, SAINT BERNARD, LA 70085-0628
PO BOX 629, SAINT BERNARD, LA 70085-0629
PO BOX 630, SAINT BERNARD, LA 70085-0630
PO BOX 631, SAINT BERNARD, LA 70085-0631
PO BOX 632, SAINT BERNARD, LA 70085-0632
PO BOX 633, SAINT BERNARD, LA 70085-0633
PO BOX 634, SAINT BERNARD, LA 70085-0634
PO BOX 635, SAINT BERNARD, LA 70085-0635
PO BOX 636, SAINT BERNARD, LA 70085-0636
PO BOX 637, SAINT BERNARD, LA 70085-0637
PO BOX 638, SAINT BERNARD, LA 70085-0638
PO BOX 639, SAINT BERNARD, LA 70085-0639
PO BOX 640, SAINT BERNARD, LA 70085-0640
PO BOX 641, SAINT BERNARD, LA 70085-0641
PO BOX 642, SAINT BERNARD, LA 70085-0642
PO BOX 643, SAINT BERNARD, LA 70085-0643
PO BOX 644, SAINT BERNARD, LA 70085-0644
PO BOX 645, SAINT BERNARD, LA 70085-0645
PO BOX 646, SAINT BERNARD, LA 70085-0646
PO BOX 647, SAINT BERNARD, LA 70085-0647
PO BOX 648, SAINT BERNARD, LA 70085-0648
PO BOX 649, SAINT BERNARD, LA 70085-0649
PO BOX 650, SAINT BERNARD, LA 70085-0650
PO BOX 651, SAINT BERNARD, LA 70085-0651
PO BOX 652, SAINT BERNARD, LA 70085-0652
PO BOX 653, SAINT BERNARD, LA 70085-0653
PO BOX 654, SAINT BERNARD, LA 70085-0654
PO BOX 655, SAINT BERNARD, LA 70085-0655
PO BOX 656, SAINT BERNARD, LA 70085-0656
PO BOX 657, SAINT BERNARD, LA 70085-0657
PO BOX 658, SAINT BERNARD, LA 70085-0658
PO BOX 659, SAINT BERNARD, LA 70085-0659
PO BOX 660, SAINT BERNARD, LA 70085-0660
PO BOX 661, SAINT BERNARD, LA 70085-0661
PO BOX 662, SAINT BERNARD, LA 70085-0662
PO BOX 663, SAINT BERNARD, LA 70085-0663
PO BOX 664, SAINT BERNARD, LA 70085-0664
PO BOX 665, SAINT BERNARD, LA 70085-0665
PO BOX 666, SAINT BERNARD, LA 70085-0666
PO BOX 667, SAINT BERNARD, LA 70085-0667
PO BOX 668, SAINT BERNARD, LA 70085-0668
PO BOX 669, SAINT BERNARD, LA 70085-0669
PO BOX 670, SAINT BERNARD, LA 70085-0670
PO BOX 671, SAINT BERNARD, LA 70085-0671
PO BOX 672, SAINT BERNARD, LA 70085-0672
PO BOX 673, SAINT BERNARD, LA 70085-0673
PO BOX 674, SAINT BERNARD, LA 70085-0674
PO BOX 675, SAINT BERNARD, LA 70085-0675
PO BOX 676, SAINT BERNARD, LA 70085-0676
PO BOX 677, SAINT BERNARD, LA 70085-0677
PO BOX 678, SAINT BERNARD, LA 70085-0678
PO BOX 679, SAINT BERNARD, LA 70085-0679
PO BOX 680, SAINT BERNARD, LA 70085-0680
PO BOX 681, SAINT BERNARD, LA 70085-0681
PO BOX 682, SAINT BERNARD, LA 70085-0682
PO BOX 683, SAINT BERNARD, LA 70085-0683
PO BOX 684, SAINT BERNARD, LA 70085-0684
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