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 581, SAN BERNARDINO, CA 92402-0581
PO BOX 582, SAN BERNARDINO, CA 92402-0582
PO BOX 583, SAN BERNARDINO, CA 92402-0583
PO BOX 584, SAN BERNARDINO, CA 92402-0584
PO BOX 585, SAN BERNARDINO, CA 92402-0585
PO BOX 586, SAN BERNARDINO, CA 92402-0586
PO BOX 587, SAN BERNARDINO, CA 92402-0587
PO BOX 588, SAN BERNARDINO, CA 92402-0588
PO BOX 589, SAN BERNARDINO, CA 92402-0589
PO BOX 590, SAN BERNARDINO, CA 92402-0590
PO BOX 591, SAN BERNARDINO, CA 92402-0591
PO BOX 592, SAN BERNARDINO, CA 92402-0592
PO BOX 593, SAN BERNARDINO, CA 92402-0593
PO BOX 594, SAN BERNARDINO, CA 92402-0594
PO BOX 595, SAN BERNARDINO, CA 92402-0595
PO BOX 596, SAN BERNARDINO, CA 92402-0596
PO BOX 597, SAN BERNARDINO, CA 92402-0597
PO BOX 598, SAN BERNARDINO, CA 92402-0598
PO BOX 599, SAN BERNARDINO, CA 92402-0599
PO BOX 600, SAN BERNARDINO, CA 92402-0600
PO BOX 601, SAN BERNARDINO, CA 92402-0601
PO BOX 602, SAN BERNARDINO, CA 92402-0602
PO BOX 603, SAN BERNARDINO, CA 92402-0603
PO BOX 604, SAN BERNARDINO, CA 92402-0604
PO BOX 605, SAN BERNARDINO, CA 92402-0605
PO BOX 606, SAN BERNARDINO, CA 92402-0606
PO BOX 607, SAN BERNARDINO, CA 92402-0607
PO BOX 608, SAN BERNARDINO, CA 92402-0608
PO BOX 609, SAN BERNARDINO, CA 92402-0609
PO BOX 610, SAN BERNARDINO, CA 92402-0610
PO BOX 611, SAN BERNARDINO, CA 92402-0611
PO BOX 612, SAN BERNARDINO, CA 92402-0612
PO BOX 613, SAN BERNARDINO, CA 92402-0613
PO BOX 614, SAN BERNARDINO, CA 92402-0614
PO BOX 615, SAN BERNARDINO, CA 92402-0615
PO BOX 616, SAN BERNARDINO, CA 92402-0616
PO BOX 617, SAN BERNARDINO, CA 92402-0617
PO BOX 618, SAN BERNARDINO, CA 92402-0618
PO BOX 619, SAN BERNARDINO, CA 92402-0619
PO BOX 620, SAN BERNARDINO, CA 92402-0620
PO BOX 621, SAN BERNARDINO, CA 92402-0621
PO BOX 622, SAN BERNARDINO, CA 92402-0622
PO BOX 623, SAN BERNARDINO, CA 92402-0623
PO BOX 624, SAN BERNARDINO, CA 92402-0624
PO BOX 625, SAN BERNARDINO, CA 92402-0625
PO BOX 626, SAN BERNARDINO, CA 92402-0626
PO BOX 627, SAN BERNARDINO, CA 92402-0627
PO BOX 628, SAN BERNARDINO, CA 92402-0628
PO BOX 629, SAN BERNARDINO, CA 92402-0629
PO BOX 630, SAN BERNARDINO, CA 92402-0630
PO BOX 631, SAN BERNARDINO, CA 92402-0631
PO BOX 632, SAN BERNARDINO, CA 92402-0632
PO BOX 633, SAN BERNARDINO, CA 92402-0633
PO BOX 634, SAN BERNARDINO, CA 92402-0634
PO BOX 635, SAN BERNARDINO, CA 92402-0635
PO BOX 636, SAN BERNARDINO, CA 92402-0636
PO BOX 637, SAN BERNARDINO, CA 92402-0637
PO BOX 638, SAN BERNARDINO, CA 92402-0638
PO BOX 639, SAN BERNARDINO, CA 92402-0639
PO BOX 640, SAN BERNARDINO, CA 92402-0640
PO BOX 641, SAN BERNARDINO, CA 92402-0641
PO BOX 642, SAN BERNARDINO, CA 92402-0642
PO BOX 643, SAN BERNARDINO, CA 92402-0643
PO BOX 644, SAN BERNARDINO, CA 92402-0644
PO BOX 645, SAN BERNARDINO, CA 92402-0645
PO BOX 646, SAN BERNARDINO, CA 92402-0646
PO BOX 647, SAN BERNARDINO, CA 92402-0647
PO BOX 648, SAN BERNARDINO, CA 92402-0648
PO BOX 649, SAN BERNARDINO, CA 92402-0649
PO BOX 650, SAN BERNARDINO, CA 92402-0650
PO BOX 651, SAN BERNARDINO, CA 92402-0651
PO BOX 652, SAN BERNARDINO, CA 92402-0652
PO BOX 653, SAN BERNARDINO, CA 92402-0653
PO BOX 654, SAN BERNARDINO, CA 92402-0654
PO BOX 655, SAN BERNARDINO, CA 92402-0655
PO BOX 656, SAN BERNARDINO, CA 92402-0656
PO BOX 657, SAN BERNARDINO, CA 92402-0657
PO BOX 658, SAN BERNARDINO, CA 92402-0658
PO BOX 659, SAN BERNARDINO, CA 92402-0659
PO BOX 660, SAN BERNARDINO, CA 92402-0660
PO BOX 661, SAN BERNARDINO, CA 92402-0661
PO BOX 662, SAN BERNARDINO, CA 92402-0662
PO BOX 663, SAN BERNARDINO, CA 92402-0663
PO BOX 664, SAN BERNARDINO, CA 92402-0664
PO BOX 665, SAN BERNARDINO, CA 92402-0665
PO BOX 666, SAN BERNARDINO, CA 92402-0666
PO BOX 667, SAN BERNARDINO, CA 92402-0667
PO BOX 668, SAN BERNARDINO, CA 92402-0668
PO BOX 669, SAN BERNARDINO, CA 92402-0669
PO BOX 670, SAN BERNARDINO, CA 92402-0670
PO BOX 671, SAN BERNARDINO, CA 92402-0671
PO BOX 672, SAN BERNARDINO, CA 92402-0672
PO BOX 673, SAN BERNARDINO, CA 92402-0673
PO BOX 674, SAN BERNARDINO, CA 92402-0674
PO BOX 675, SAN BERNARDINO, CA 92402-0675
PO BOX 676, SAN BERNARDINO, CA 92402-0676
PO BOX 677, SAN BERNARDINO, CA 92402-0677
PO BOX 678, SAN BERNARDINO, CA 92402-0678
PO BOX 679, SAN BERNARDINO, CA 92402-0679
PO BOX 680, SAN BERNARDINO, CA 92402-0680
PO BOX 681, SAN BERNARDINO, CA 92402-0681
PO BOX 682, SAN BERNARDINO, CA 92402-0682
PO BOX 683, SAN BERNARDINO, CA 92402-0683
PO BOX 684, SAN BERNARDINO, CA 92402-0684
PO BOX 685, SAN BERNARDINO, CA 92402-0685
PO BOX 686, SAN BERNARDINO, CA 92402-0686
PO BOX 687, SAN BERNARDINO, CA 92402-0687
PO BOX 688, SAN BERNARDINO, CA 92402-0688
PO BOX 689, SAN BERNARDINO, CA 92402-0689
PO BOX 690, SAN BERNARDINO, CA 92402-0690
PO BOX 691, SAN BERNARDINO, CA 92402-0691
PO BOX 692, SAN BERNARDINO, CA 92402-0692
PO BOX 693, SAN BERNARDINO, CA 92402-0693
PO BOX 694, SAN BERNARDINO, CA 92402-0694
PO BOX 695, SAN BERNARDINO, CA 92402-0695
PO BOX 696, SAN BERNARDINO, CA 92402-0696
PO BOX 697, SAN BERNARDINO, CA 92402-0697
PO BOX 698, SAN BERNARDINO, CA 92402-0698
PO BOX 699, SAN BERNARDINO, CA 92402-0699
PO BOX 700, SAN BERNARDINO, CA 92402-0700
PO BOX 701, SAN BERNARDINO, CA 92402-0701
PO BOX 702, SAN BERNARDINO, CA 92402-0702
PO BOX 703, SAN BERNARDINO, CA 92402-0703
PO BOX 704, SAN BERNARDINO, CA 92402-0704
PO BOX 705, SAN BERNARDINO, CA 92402-0705
PO BOX 706, SAN BERNARDINO, CA 92402-0706
PO BOX 707, SAN BERNARDINO, CA 92402-0707
PO BOX 708, SAN BERNARDINO, CA 92402-0708
PO BOX 709, SAN BERNARDINO, CA 92402-0709
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