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 561, SOUTH SAN FRANCISCO, CA 94083-0561
PO BOX 562, SOUTH SAN FRANCISCO, CA 94083-0562
PO BOX 563, SOUTH SAN FRANCISCO, CA 94083-0563
PO BOX 564, SOUTH SAN FRANCISCO, CA 94083-0564
PO BOX 565, SOUTH SAN FRANCISCO, CA 94083-0565
PO BOX 566, SOUTH SAN FRANCISCO, CA 94083-0566
PO BOX 567, SOUTH SAN FRANCISCO, CA 94083-0567
PO BOX 568, SOUTH SAN FRANCISCO, CA 94083-0568
PO BOX 569, SOUTH SAN FRANCISCO, CA 94083-0569
PO BOX 570, SOUTH SAN FRANCISCO, CA 94083-0570
PO BOX 571, SOUTH SAN FRANCISCO, CA 94083-0571
PO BOX 572, SOUTH SAN FRANCISCO, CA 94083-0572
PO BOX 573, SOUTH SAN FRANCISCO, CA 94083-0573
PO BOX 574, SOUTH SAN FRANCISCO, CA 94083-0574
PO BOX 575, SOUTH SAN FRANCISCO, CA 94083-0575
PO BOX 576, SOUTH SAN FRANCISCO, CA 94083-0576
PO BOX 577, SOUTH SAN FRANCISCO, CA 94083-0577
PO BOX 578, SOUTH SAN FRANCISCO, CA 94083-0578
PO BOX 579, SOUTH SAN FRANCISCO, CA 94083-0579
PO BOX 580, SOUTH SAN FRANCISCO, CA 94083-0580
PO BOX 581, SOUTH SAN FRANCISCO, CA 94083-0581
PO BOX 582, SOUTH SAN FRANCISCO, CA 94083-0582
PO BOX 583, SOUTH SAN FRANCISCO, CA 94083-0583
PO BOX 584, SOUTH SAN FRANCISCO, CA 94083-0584
PO BOX 585, SOUTH SAN FRANCISCO, CA 94083-0585
PO BOX 586, SOUTH SAN FRANCISCO, CA 94083-0586
PO BOX 587, SOUTH SAN FRANCISCO, CA 94083-0587
PO BOX 588, SOUTH SAN FRANCISCO, CA 94083-0588
PO BOX 589, SOUTH SAN FRANCISCO, CA 94083-0589
PO BOX 590, SOUTH SAN FRANCISCO, CA 94083-0590
PO BOX 591, SOUTH SAN FRANCISCO, CA 94083-0591
PO BOX 592, SOUTH SAN FRANCISCO, CA 94083-0592
PO BOX 593, SOUTH SAN FRANCISCO, CA 94083-0593
PO BOX 594, SOUTH SAN FRANCISCO, CA 94083-0594
PO BOX 595, SOUTH SAN FRANCISCO, CA 94083-0595
PO BOX 596, SOUTH SAN FRANCISCO, CA 94083-0596
PO BOX 597, SOUTH SAN FRANCISCO, CA 94083-0597
PO BOX 598, SOUTH SAN FRANCISCO, CA 94083-0598
PO BOX 599, SOUTH SAN FRANCISCO, CA 94083-0599
PO BOX 600, SOUTH SAN FRANCISCO, CA 94083-0600
PO BOX 601, SOUTH SAN FRANCISCO, CA 94083-0601
PO BOX 602, SOUTH SAN FRANCISCO, CA 94083-0602
PO BOX 603, SOUTH SAN FRANCISCO, CA 94083-0603
PO BOX 604, SOUTH SAN FRANCISCO, CA 94083-0604
PO BOX 605, SOUTH SAN FRANCISCO, CA 94083-0605
PO BOX 606, SOUTH SAN FRANCISCO, CA 94083-0606
PO BOX 607, SOUTH SAN FRANCISCO, CA 94083-0607
PO BOX 608, SOUTH SAN FRANCISCO, CA 94083-0608
PO BOX 609, SOUTH SAN FRANCISCO, CA 94083-0609
PO BOX 610, SOUTH SAN FRANCISCO, CA 94083-0610
PO BOX 611, SOUTH SAN FRANCISCO, CA 94083-0611
PO BOX 612, SOUTH SAN FRANCISCO, CA 94083-0612
PO BOX 613, SOUTH SAN FRANCISCO, CA 94083-0613
PO BOX 614, SOUTH SAN FRANCISCO, CA 94083-0614
PO BOX 615, SOUTH SAN FRANCISCO, CA 94083-0615
PO BOX 616, SOUTH SAN FRANCISCO, CA 94083-0616
PO BOX 617, SOUTH SAN FRANCISCO, CA 94083-0617
PO BOX 618, SOUTH SAN FRANCISCO, CA 94083-0618
PO BOX 619, SOUTH SAN FRANCISCO, CA 94083-0619
PO BOX 620, SOUTH SAN FRANCISCO, CA 94083-0620
PO BOX 621, SOUTH SAN FRANCISCO, CA 94083-0621
PO BOX 622, SOUTH SAN FRANCISCO, CA 94083-0622
PO BOX 623, SOUTH SAN FRANCISCO, CA 94083-0623
PO BOX 624, SOUTH SAN FRANCISCO, CA 94083-0624
PO BOX 625, SOUTH SAN FRANCISCO, CA 94083-0625
PO BOX 626, SOUTH SAN FRANCISCO, CA 94083-0626
PO BOX 627, SOUTH SAN FRANCISCO, CA 94083-0627
PO BOX 628, SOUTH SAN FRANCISCO, CA 94083-0628
PO BOX 629, SOUTH SAN FRANCISCO, CA 94083-0629
PO BOX 630, SOUTH SAN FRANCISCO, CA 94083-0630
PO BOX 631, SOUTH SAN FRANCISCO, CA 94083-0631
PO BOX 632, SOUTH SAN FRANCISCO, CA 94083-0632
PO BOX 633, SOUTH SAN FRANCISCO, CA 94083-0633
PO BOX 634, SOUTH SAN FRANCISCO, CA 94083-0634
PO BOX 635, SOUTH SAN FRANCISCO, CA 94083-0635
PO BOX 636, SOUTH SAN FRANCISCO, CA 94083-0636
PO BOX 637, SOUTH SAN FRANCISCO, CA 94083-0637
PO BOX 638, SOUTH SAN FRANCISCO, CA 94083-0638
PO BOX 639, SOUTH SAN FRANCISCO, CA 94083-0639
PO BOX 640, SOUTH SAN FRANCISCO, CA 94083-0640
PO BOX 641, SOUTH SAN FRANCISCO, CA 94083-0641
PO BOX 642, SOUTH SAN FRANCISCO, CA 94083-0642
PO BOX 643, SOUTH SAN FRANCISCO, CA 94083-0643
PO BOX 644, SOUTH SAN FRANCISCO, CA 94083-0644
PO BOX 645, SOUTH SAN FRANCISCO, CA 94083-0645
PO BOX 646, SOUTH SAN FRANCISCO, CA 94083-0646
PO BOX 647, SOUTH SAN FRANCISCO, CA 94083-0647
PO BOX 648, SOUTH SAN FRANCISCO, CA 94083-0648
PO BOX 649, SOUTH SAN FRANCISCO, CA 94083-0649
PO BOX 650, SOUTH SAN FRANCISCO, CA 94083-0650
PO BOX 651, SOUTH SAN FRANCISCO, CA 94083-0651
PO BOX 652, SOUTH SAN FRANCISCO, CA 94083-0652
PO BOX 653, SOUTH SAN FRANCISCO, CA 94083-0653
PO BOX 654, SOUTH SAN FRANCISCO, CA 94083-0654
PO BOX 655, SOUTH SAN FRANCISCO, CA 94083-0655
PO BOX 656, SOUTH SAN FRANCISCO, CA 94083-0656
PO BOX 657, SOUTH SAN FRANCISCO, CA 94083-0657
PO BOX 658, SOUTH SAN FRANCISCO, CA 94083-0658
PO BOX 659, SOUTH SAN FRANCISCO, CA 94083-0659
PO BOX 660, SOUTH SAN FRANCISCO, CA 94083-0660
PO BOX 661, SOUTH SAN FRANCISCO, CA 94083-0661
PO BOX 662, SOUTH SAN FRANCISCO, CA 94083-0662
PO BOX 663, SOUTH SAN FRANCISCO, CA 94083-0663
PO BOX 664, SOUTH SAN FRANCISCO, CA 94083-0664
PO BOX 665, SOUTH SAN FRANCISCO, CA 94083-0665
PO BOX 666, SOUTH SAN FRANCISCO, CA 94083-0666
PO BOX 667, SOUTH SAN FRANCISCO, CA 94083-0667
PO BOX 668, SOUTH SAN FRANCISCO, CA 94083-0668
PO BOX 669, SOUTH SAN FRANCISCO, CA 94083-0669
PO BOX 670, SOUTH SAN FRANCISCO, CA 94083-0670
PO BOX 671, SOUTH SAN FRANCISCO, CA 94083-0671
PO BOX 672, SOUTH SAN FRANCISCO, CA 94083-0672
PO BOX 673, SOUTH SAN FRANCISCO, CA 94083-0673
PO BOX 674, SOUTH SAN FRANCISCO, CA 94083-0674
PO BOX 675, SOUTH SAN FRANCISCO, CA 94083-0675
PO BOX 676, SOUTH SAN FRANCISCO, CA 94083-0676
PO BOX 677, SOUTH SAN FRANCISCO, CA 94083-0677
PO BOX 678, SOUTH SAN FRANCISCO, CA 94083-0678
PO BOX 679, SOUTH SAN FRANCISCO, CA 94083-0679
PO BOX 680, SOUTH SAN FRANCISCO, CA 94083-0680
PO BOX 681, SOUTH SAN FRANCISCO, CA 94083-0681
PO BOX 682, SOUTH SAN FRANCISCO, CA 94083-0682
PO BOX 683, SOUTH SAN FRANCISCO, CA 94083-0683
PO BOX 684, SOUTH SAN FRANCISCO, CA 94083-0684
PO BOX 685, SOUTH SAN FRANCISCO, CA 94083-0685
PO BOX 686, SOUTH SAN FRANCISCO, CA 94083-0686
PO BOX 687, SOUTH SAN FRANCISCO, CA 94083-0687
PO BOX 688, SOUTH SAN FRANCISCO, CA 94083-0688
PO BOX 689, SOUTH SAN FRANCISCO, CA 94083-0689
PO BOX 690, SOUTH SAN FRANCISCO, CA 94083-0690
PO BOX 691, SOUTH SAN FRANCISCO, CA 94083-0691
PO BOX 692, SOUTH SAN FRANCISCO, CA 94083-0692
PO BOX 693, SOUTH SAN FRANCISCO, CA 94083-0693
PO BOX 694, SOUTH SAN FRANCISCO, CA 94083-0694
PO BOX 695, SOUTH SAN FRANCISCO, CA 94083-0695
PO BOX 696, SOUTH SAN FRANCISCO, CA 94083-0696
PO BOX 697, SOUTH SAN FRANCISCO, CA 94083-0697
PO BOX 698, SOUTH SAN FRANCISCO, CA 94083-0698
PO BOX 699, SOUTH SAN FRANCISCO, CA 94083-0699
PO BOX 700, SOUTH SAN FRANCISCO, CA 94083-0700
PO BOX 701, SOUTH SAN FRANCISCO, CA 94083-0701
PO BOX 702, SOUTH SAN FRANCISCO, CA 94083-0702
PO BOX 703, SOUTH SAN FRANCISCO, CA 94083-0703
PO BOX 704, SOUTH SAN FRANCISCO, CA 94083-0704
PO BOX 705, SOUTH SAN FRANCISCO, CA 94083-0705
PO BOX 706, SOUTH SAN FRANCISCO, CA 94083-0706
PO BOX 707, SOUTH SAN FRANCISCO, CA 94083-0707
PO BOX 708, SOUTH SAN FRANCISCO, CA 94083-0708
PO BOX 709, SOUTH SAN FRANCISCO, CA 94083-0709
PO BOX 710, SOUTH SAN FRANCISCO, CA 94083-0710
PO BOX 711, SOUTH SAN FRANCISCO, CA 94083-0711
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