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 521, PASADENA, CA 91102-0521
PO BOX 522, PASADENA, CA 91102-0522
PO BOX 523, PASADENA, CA 91102-0523
PO BOX 524, PASADENA, CA 91102-0524
PO BOX 525, PASADENA, CA 91102-0525
PO BOX 526, PASADENA, CA 91102-0526
PO BOX 527, PASADENA, CA 91102-0527
PO BOX 528, PASADENA, CA 91102-0528
PO BOX 529, PASADENA, CA 91102-0529
PO BOX 530, PASADENA, CA 91102-0530
PO BOX 531, PASADENA, CA 91102-0531
PO BOX 532, PASADENA, CA 91102-0532
PO BOX 533, PASADENA, CA 91102-0533
PO BOX 534, PASADENA, CA 91102-0534
PO BOX 535, PASADENA, CA 91102-0535
PO BOX 536, PASADENA, CA 91102-0536
PO BOX 537, PASADENA, CA 91102-0537
PO BOX 538, PASADENA, CA 91102-0538
PO BOX 539, PASADENA, CA 91102-0539
PO BOX 540, PASADENA, CA 91102-0540
PO BOX 541, PASADENA, CA 91102-0541
PO BOX 542, PASADENA, CA 91102-0542
PO BOX 543, PASADENA, CA 91102-0543
PO BOX 544, PASADENA, CA 91102-0544
PO BOX 545, PASADENA, CA 91102-0545
PO BOX 546, PASADENA, CA 91102-0546
PO BOX 547, PASADENA, CA 91102-0547
PO BOX 548, PASADENA, CA 91102-0548
PO BOX 549, PASADENA, CA 91102-0549
PO BOX 550, PASADENA, CA 91102-0550
PO BOX 551, PASADENA, CA 91102-0551
PO BOX 552, PASADENA, CA 91102-0552
PO BOX 553, PASADENA, CA 91102-0553
PO BOX 554, PASADENA, CA 91102-0554
PO BOX 555, PASADENA, CA 91102-0555
PO BOX 556, PASADENA, CA 91102-0556
PO BOX 557, PASADENA, CA 91102-0557
PO BOX 558, PASADENA, CA 91102-0558
PO BOX 559, PASADENA, CA 91102-0559
PO BOX 560, PASADENA, CA 91102-0560
PO BOX 561, PASADENA, CA 91102-0561
PO BOX 562, PASADENA, CA 91102-0562
PO BOX 563, PASADENA, CA 91102-0563
PO BOX 564, PASADENA, CA 91102-0564
PO BOX 565, PASADENA, CA 91102-0565
PO BOX 566, PASADENA, CA 91102-0566
PO BOX 567, PASADENA, CA 91102-0567
PO BOX 568, PASADENA, CA 91102-0568
PO BOX 569, PASADENA, CA 91102-0569
PO BOX 570, PASADENA, CA 91102-0570
PO BOX 571, PASADENA, CA 91102-0571
PO BOX 572, PASADENA, CA 91102-0572
PO BOX 573, PASADENA, CA 91102-0573
PO BOX 574, PASADENA, CA 91102-0574
PO BOX 575, PASADENA, CA 91102-0575
PO BOX 576, PASADENA, CA 91102-0576
PO BOX 577, PASADENA, CA 91102-0577
PO BOX 578, PASADENA, CA 91102-0578
PO BOX 579, PASADENA, CA 91102-0579
PO BOX 580, PASADENA, CA 91102-0580
PO BOX 581, PASADENA, CA 91102-0581
PO BOX 582, PASADENA, CA 91102-0582
PO BOX 583, PASADENA, CA 91102-0583
PO BOX 584, PASADENA, CA 91102-0584
PO BOX 585, PASADENA, CA 91102-0585
PO BOX 586, PASADENA, CA 91102-0586
PO BOX 587, PASADENA, CA 91102-0587
PO BOX 588, PASADENA, CA 91102-0588
PO BOX 589, PASADENA, CA 91102-0589
PO BOX 590, PASADENA, CA 91102-0590
PO BOX 591, PASADENA, CA 91102-0591
PO BOX 592, PASADENA, CA 91102-0592
PO BOX 593, PASADENA, CA 91102-0593
PO BOX 594, PASADENA, CA 91102-0594
PO BOX 595, PASADENA, CA 91102-0595
PO BOX 596, PASADENA, CA 91102-0596
PO BOX 597, PASADENA, CA 91102-0597
PO BOX 598, PASADENA, CA 91102-0598
PO BOX 599, PASADENA, CA 91102-0599
PO BOX 600, PASADENA, CA 91102-0600
PO BOX 601, PASADENA, CA 91102-0601
PO BOX 602, PASADENA, CA 91102-0602
PO BOX 603, PASADENA, CA 91102-0603
PO BOX 604, PASADENA, CA 91102-0604
PO BOX 605, PASADENA, CA 91102-0605
PO BOX 606, PASADENA, CA 91102-0606
PO BOX 607, PASADENA, CA 91102-0607
PO BOX 608, PASADENA, CA 91102-0608
PO BOX 609, PASADENA, CA 91102-0609
PO BOX 610, PASADENA, CA 91102-0610
PO BOX 611, PASADENA, CA 91102-0611
PO BOX 612, PASADENA, CA 91102-0612
PO BOX 613, PASADENA, CA 91102-0613
PO BOX 614, PASADENA, CA 91102-0614
PO BOX 615, PASADENA, CA 91102-0615
PO BOX 616, PASADENA, CA 91102-0616
PO BOX 617, PASADENA, CA 91102-0617
PO BOX 618, PASADENA, CA 91102-0618
PO BOX 619, PASADENA, CA 91102-0619
PO BOX 620, PASADENA, CA 91102-0620
PO BOX 621, PASADENA, CA 91102-0621
PO BOX 622, PASADENA, CA 91102-0622
PO BOX 623, PASADENA, CA 91102-0623
PO BOX 624, PASADENA, CA 91102-0624
PO BOX 625, PASADENA, CA 91102-0625
PO BOX 626, PASADENA, CA 91102-0626
PO BOX 627, PASADENA, CA 91102-0627
PO BOX 628, PASADENA, CA 91102-0628
PO BOX 629, PASADENA, CA 91102-0629
PO BOX 630, PASADENA, CA 91102-0630
PO BOX 631, PASADENA, CA 91102-0631
PO BOX 632, PASADENA, CA 91102-0632
PO BOX 633, PASADENA, CA 91102-0633
PO BOX 634, PASADENA, CA 91102-0634
PO BOX 635, PASADENA, CA 91102-0635
PO BOX 636, PASADENA, CA 91102-0636
PO BOX 637, PASADENA, CA 91102-0637
PO BOX 638, PASADENA, CA 91102-0638
PO BOX 639, PASADENA, CA 91102-0639
PO BOX 640, PASADENA, CA 91102-0640
PO BOX 641, PASADENA, CA 91102-0641
PO BOX 642, PASADENA, CA 91102-0642
PO BOX 643, PASADENA, CA 91102-0643
PO BOX 644, PASADENA, CA 91102-0644
PO BOX 645, PASADENA, CA 91102-0645
PO BOX 646, PASADENA, CA 91102-0646
PO BOX 647, PASADENA, CA 91102-0647
PO BOX 648, PASADENA, CA 91102-0648
PO BOX 649, PASADENA, CA 91102-0649
PO BOX 650, PASADENA, CA 91102-0650
PO BOX 651, PASADENA, CA 91102-0651
PO BOX 652, PASADENA, CA 91102-0652
PO BOX 653, PASADENA, CA 91102-0653
PO BOX 654, PASADENA, CA 91102-0654
PO BOX 655, PASADENA, CA 91102-0655
PO BOX 656, PASADENA, CA 91102-0656
PO BOX 657, PASADENA, CA 91102-0657
PO BOX 658, PASADENA, CA 91102-0658
PO BOX 659, PASADENA, CA 91102-0659
PO BOX 660, PASADENA, CA 91102-0660
PO BOX 661, PASADENA, CA 91102-0661
PO BOX 662, PASADENA, CA 91102-0662
PO BOX 663, PASADENA, CA 91102-0663
PO BOX 664, PASADENA, CA 91102-0664
PO BOX 665, PASADENA, CA 91102-0665
PO BOX 666, PASADENA, CA 91102-0666
PO BOX 667, PASADENA, CA 91102-0667
PO BOX 668, PASADENA, CA 91102-0668
PO BOX 669, PASADENA, CA 91102-0669
PO BOX 670, PASADENA, CA 91102-0670
PO BOX 671, PASADENA, CA 91102-0671
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